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1

Response of the ATLAS Tile calorimeter prototype to muons  

Microsoft Academic Search

A study of high energy muons traversing the ATLAS hadron Tile calorimeter in the barrel region in the energy range between 10 and 300 GeV is presented. Both test beam experimental data and Monte Carlo simulations are given and show good agreement. The Tile calorimeter capability of detecting isolated muons over the above energy range is demonstrated. A signal to

Z. Ajaltouni; F. Albiol; A. Alifanov; P. Amaral; A. Amorim; K. Anderson; C. Angelini; A. Astvatsaturov; D. Autiero; F. Badaud; G. Barreira; S. Berglund; G. Blanchot; E. Blucher; C. Blaj; A. Bogush; C. Bohm; V. Boldea; O. Borisov; M. Bosman; N. Bouhemaid; P. Brette; C. Bromberg; M. Brossard; J. Budagov; L. Caloba; J. Carvalho; P. Casado; M. Cavalli-Sforza; V. Cavasinni; R. Chadelas; J.-C Chevaleyre; I. Chirikov-Zorin; G. Chlachidze; M. Cobal; F. Cogswell; F. Colaço; S. Constantinescu; D. Costanzo; M. Crouau; F. Daudon; M. David; T. Davidek; J. Dawson; J.-J. Dugne; K. de; T Del Prete; A De Santo; B Di Girolamo; S. Dita; J. Dolejsi; Z. Dolezal; R. Downing; I. Efthymiopoulos; D. Errede; S. Errede; H. Evans; A. Ferrer; V. Flaminio; E. Gallas; M. Gaspar; O. Gildemeister; V. Glagolev; V. Golubev; A. Gomes; V. Grabsky; M. Haney; H. Hakopian; S. Hellman; A. Henriques; S. Holmgren; P. F Honoré; J. Huston; Yu. Ivanyushenkov; E. Johansson; A. Juste; S. Kakurin; G. Karapetian; A. Karyukhin; Yu. Khokhlov; V. Klyukhin; V. Kolomoets; S. Kopikov; M. Kostrikov; V. Kovtun; V. Kukhtin; M. Kulagin; Y. Kulchitsky; S. Lami; V. Lapin; C. Lazzeroni; A. Lebedev; R. Leitner; J. Li; I. Liba; Yu. Lomakin; O. Lomakina; M. Lokajicek; A. Maio; S. Malyukov; F. Marroquin; J. P Martins; E. Mazzoni; F. Merritt; B. Michel; R. Miller; I. Minashvili; Ll. Miralles; E. Mnatsakanian; G. Montarou; G. S Muanza; S. Nemecek; M. Nessi; A. Onofre; S. Orteu; C. Padilla; D. Pallin; D. Pantea; J. Patriarca; A. Pereira; J. A Perlas; J. Pilcher; J. Pinhão; L. Poggioli; S. Poirot; L. Price; Y. Protopopov; J. Proudfoot; O. Pukhov; G. Reinmuth; G. Renzoni; R. Richards; I. Riu; V. Romanov; B. Ronceux; V. Rumyantsev; N. Russakovich; H. Sanders; J. Santos; L. Sawyer; L.-P Says; J. M Seixas; B. Sellden; A. Semenov; V. Senchishin; A. Shchelchkov; V. Shevtsov; M. Schochet; V. Sidorov; V. Simaitis; A. Sissakian; A. Solodkov; P. Sonderegger; K. Soustruznik; R. Stanek; E. Starchenko; R. Stephens; S. Studenov; M. Suk; A. Surkov; F. Tang; S. Tardell; P. Tas; F. Teubert; J. Thaler; S. Tokar; N. Topilin; Z. Trka; A. Turcot; M. Turcotte; S. Valkar; M. J Varandas; A. Vartapetian; F. Vazeille; V. Vinogradov; S. Vorozhtsov; D. Wagner; A. White; H. Wolters; N. Yamdagni; G. Yarygin; C. Yosef; A. Zaitsev; M. Zdrazil

1997-01-01

2

Muon detection based on a hadronic calorimeter  

Microsoft Academic Search

The ATLAS Tile hadronic calorimeter (TileCal) provides highly-segmented energy measurements of incoming particles. The information from TileCal's last segmentation layer can assist in muon tagging and it is being considered for a future upgrade of the level-one trigger to reject triggers due to radiation background effects in the barrel region. A muon receiver for the TileCal muon signals is being

T. Ciodaro

2010-01-01

3

The optical instrumentation of the ATLAS Tile Calorimeter  

NASA Astrophysics Data System (ADS)

The Tile Calorimeter, covering the central region of the ATLAS experiment up to pseudorapidities of ±1.7, is a sampling device built with scintillating tiles that alternate with iron plates. The light is collected in wave-length shifting (WLS) fibers and is read out with photomultipliers. In the characteristic geometry of this calorimeter the tiles lie in planes perpendicular to the beams, resulting in a very simple and modular mechanical and optical layout. This paper focuses on the procedures applied in the optical instrumentation of the calorimeter, which involved the assembly of about 460,000 scintillator tiles and 550,000 WLS fibers. The outcome is a hadronic calorimeter that meets the ATLAS performance requirements, as shown in this paper.

Abdallah, J.; Adragna, P.; Alexa, C.; Alves, R.; Amaral, P.; Ananiev, A.; Anderson, K.; Andresen, X.; Antonaki, A.; Batusov, V.; Bednar, P.; Bergeaas, E.; Biscarat, C.; Blanch, O.; Blanchot, G.; Bohm, C.; Boldea, V.; Bosi, F.; Bosman, M.; Bromberg, C.; Budagov, J.; Calvet, D.; Cardeira, C.; Carli, T.; Carvalho, J.; Cascella, M.; Castillo, M. V.; Costelo, J.; Cavalli-Sforza, M.; Cavasinni, V.; Cerqueira, A. S.; Clement, C.; Cobal, M.; Cogswell, F.; Constantinescu, S.; Costanzo, D.; Da Silva, P.; David, M.; Davidek, T.; Dawson, J.; De, K.; Del Prete, T.; Diakov, E.; Di Girolamo, B.; Dita, S.; Dolejsi, J.; Dolezal, Z.; Dotti, A.; Downing, R.; Drake, G.; Efthymiopoulos, I.; Errede, D.; Errede, S.; Farbin, A.; Fassouliotis, D.; Feng, E.; Fenyuk, A.; Ferdi, C.; Ferreira, B. C.; Ferrer, A.; Flaminio, V.; Flix, J.; Francavilla, P.; Fullana, E.; Garde, V.; Gellerstedt, K.; Giakoumopoulou, V.; Giangiobbe, V.; Gildemeister, O.; Gilewsky, V.; Giokaris, N.; Gollub, N.; Gomes, A.; Gonzalez, V.; Gouveia, J.; Grenier, P.; Gris, P.; Guarino, V.; Guicheney, C.; Gupta, A.; Hakobyan, H.; Haney, M.; Hellman, S.; Henriques, A.; Higon, E.; Hill, N.; Holmgren, S.; Hruska, I.; Hurwitz, M.; Huston, J.; Jen-La Plante, I.; Jon-And, K.; Junk, T.; Karyukhin, A.; Khubua, J.; Klereborn, J.; Konstantinov, V.; Kopikov, S.; Korolkov, I.; Krivkova, P.; Kulchitsky, Y.; Kurochkin, Yu; Kuzhir, P.; Lapin, V.; LeCompte, T.; Lefevre, R.; Leitner, R.; Li, J.; Liablin, M.; Lokajicek, M.; Lomakin, Y.; Lourtie, P.; Lovas, L.; Lupi, A.; Maidantchik, C.; Maio, A.; Maliukov, S.; Manousakis, A.; Marques, C.; Marroquim, F.; Martin, F.; Mazzoni, E.; Merritt, F.; Miagkov, A.; Miller, R.; Minashvili, I.; Miralles, L.; Montarou, G.; Nemecek, S.; Nessi, M.; Nikitine, I.; Nodulman, L.; Norniella, O.; Onofre, A.; Oreglia, M.; Palan, B.; Pallin, D.; Pantea, D.; Pereira, A.; Pilcher, J.; Pina, J.; Pinhao, J.; Pod, E.; Podlyski, F.; Portell, X.; Poveda, J.; Pribyl, L.; Price, L. E.; Proudfoot, J.; Ramalho, M.; Ramstedt, M.; Raposeiro, L.; Reis, J.; Richards, R.; Roda, C.; Romanov, V.; Rosnet, P.; Roy, P.; Ruiz, A.; Rumiantsau, V.; Russakovich, N.; da Costa, J. Sa; Saltó, O.; Salvachua, B.; Sanchis, E.; Sanders, H.; Santoni, C.; Santos, J.; Saraiva, J. G.; Sarri, F.; Says, L.-P.; Schlager, G.; Schlereth, J.; Seixas, J. M.; Sellden, B.; Shalanda, N.; Shevtsov, P.; Shochet, M.; Silva, J.; Simaitis, V.; Simonyan, M.; Sissakian, A.; Sjoelin, J.; Solans, C.; Solodkov, A.; Solovianov, O.; Sosebee, M.; Spanò, F.; Speckmeyer, P.; Stanek, R.; Starchenko, E.; Starovoitov, P.; Suk, M.; Sykora, I.; Tang, F.; Tas, P.; Teuscher, R.; Tischenko, M.; Tokar, S.; Topilin, N.; Torres, J.; Underwood, D.; Usai, G.; Valero, A.; Valkar, S.; Valls, J. A.; Vartapetian, A.; Vazeille, F.; Vellidis, C.; Ventura, F.; Vichou, I.; Vivarelli, I.; Volpi, M.; White, A.; Zaitsev, A.; Zaytsev, Yu; Zenin, A.; Zenis, T.; Zenonos, Z.; Zenz, S.; Zilka, B.

2013-01-01

4

Hadronic shower development in Iron-Scintillator Tile Calorimetry  

Microsoft Academic Search

The lateral and longitudinal profiles of hadronic showers detected by a prototype of the ATLAS Iron-Scintillator Tile Hadron Calorimeter have been investigated. This calorimeter presents a unique longitudinal configuration of scintillator tiles. Using a fine-grained pion beam scan at 100GeV, a detailed picture of transverse shower behaviour is obtained. The underlying radial energy densities for the four depth segments and

P. Amaral; A. Amorim; K. Anderson; G. Barreira; R. Benetta; S. Berglund; C. Biscarat; G. Blanchot; E. Blucher; A A Bogush; C. Bohm; V. Boldea; O. Borisov; M. Bosman; C. Bromberg; J. Budagov; S. Burdin; L. Caloba; J. Carvalho; P. Casado; M. V. Castillo; M. Cavalli-Sforza; V. Cavasinni; R. Chadelas; I E Chirikov-Zorin; G. Chlachidze; M. Cobal; F. Cogswell; F. Colaço; S. Cologna; S. Constantinescu; D. Costanzo; M. Crouau; F. Daudon; J. David; M. David; T. Davidek; J. Dawson; K. De; T. Del Prete; A. De Santo; B. Di Girolamo; S. Dita; J. Dolejsi; Z. Dolezal; R. Downing; I. Efthymiopoulos; M. Engström; D. Errede; S. Errede; H. Evans; A. Fenyuk; A. Ferrer; V. Flaminio; E. Gallas; M. Gaspar; I. Gil; O. Gildemeister; V. Glagolev; A. Gomes; V. Gonzalez; S. González De La Hoz; V Grabskii; E Graugès-Pous; P. Grenier; H H Hakopian; M. Haney; M. Hansen; S. Hellman; A. Henriques; C. Hebrard; E. Higon; S O Holmgren; J. Huston; Yu M Ivanyushenkov; A. Juste; S. Kakurin; G V Karapetian; A N Karyukhin; S. Kopikov; V. Kukhtin; Y. Kulchitsky; W. Kurzbauer; M. Kuzmin; S. Lami; V. Lapin; C. Lazzeroni; A. Lebedev; R. Leitner; J. Li; Yu F Lomakin; O V Lomakina; M. Lokajicek; J. M. Lopez Amengual; A. Maio; S. Malyukov; F. Marroquin; J. P. Martins; E. Mazzoni; F S Merritt; R. Miller; I A Minashvili; Ll. Miralles; G. Montarou; A. Munar; S. Nemecek; Marzio Nessi; A. Onofre; S. Orteu; I. C. Park; D. Pallin; D. Pantea; R. Paoletti; J. Patriarca; A. Pereira; J. A. Perlas; P. Petit; J E Pilcher; L. Poggioli; L. Price; J. Proudfoot; O. Pukhov; G. Reinmuth; G. Renzoni; R. Richards; C. Roda; J. B. Romance; V. Romanov; B. Ronceux; P. Rosnet; V. Rumyantsev; N. Russakovich; E. Sanchis; H. Sanders; C. Santoni; J. Santos; L. Sawyer; L.-P. Says; J. M. Seixas; B. Selldèn; A. Semenov; A S Shchelchkov; M. Shochet; V. Simaitis; A N Sissakian; A. Solodkov; O. Solovianov; P. Sonderegger; M. Sosebee; K. Soustruznik; F. Spanó; R. Stanek; E A Starchenko; R. Stephens; M. Suk; F. Tang; P. Tas; J. Thaler; S. Tokar; N. Topilin; Z. Trka; A S Turcot; M. Turcotte; S. Valkar; M. J. Varandas; A H Vartapetian; F. Vazeille; I. Vichou; V. Vinogradov; S B Vorozhtsov; D. Wagner; A. White; H. Wolters; N. Yamdagni; G. Yarygin; C. Yosef; A. Zaitsev; M. Zdrazil

2000-01-01

5

LASER monitoring system for the ATLAS Tile Calorimeter  

NASA Astrophysics Data System (ADS)

The ATLAS detector at the Large Hadron Collider (LHC) at CERN uses a scintillator-iron technique for its hadronic Tile Calorimeter (TileCal). Scintillating light is readout via 9852 photomultiplier tubes (PMTs). Calibration and monitoring of these PMTs are made using a LASER based system. Short light pulses are sent simultaneously into all the TileCal photomultiplier's tubes (PMTs) during ATLAS physics runs, thus providing essential information for ATLAS data quality and monitoring analyses. The experimental setup developed for this purpose is described as well as preliminary results obtained during ATLAS commissioning phase in 2008.

Viret, S.; LPC ATLAS Group

2010-05-01

6

The ATLAS tile calorimeter performance at the LHC  

SciTech Connect

The Tile Calorimeter (TileCal), the central section of the hadronic calorimeter of the ATLAS experiment, is a key detector component to detect hadrons, jets and taus and to measure the missing transverse energy. Due to the very good muon signal to noise ratio it assists the spectrometer in the identification and reconstruction of muons. TileCal is built of steel and scintillating tiles coupled to optical fibers and read out by photomultipliers. The calorimeter is equipped with systems that allow to monitor and to calibrate each stage of the read out system exploiting different signal sources: laser light, charge injection and a radioactive source. The performance of the calorimeter has been measured and monitored using calibration data, random triggered data, cosmic muons and more importantly LHC collision events. The results presented here assess the absolute energy scale calibration precision, the energy and timing uniformity and the synchronization precision. The ensemble of the results demonstrates a very good understanding of the performance of the Tile Calorimeter that is proved to be well within the design expectations. (authors)

Calkins, R. [N.I.U. (United States)

2011-07-01

7

Testbeam studies of production modules of the ATLAS Tile Calorimeter  

NASA Astrophysics Data System (ADS)

We report test beam studies of 11% of the production ATLAS Tile Calorimeter modules. The modules were equipped with production front-end electronics and all the calibration systems planned for the final detector. The studies used muon, electron and hadron beams ranging in energy from 3 to 350 GeV. Two independent studies showed that the light yield of the calorimeter was ˜70pe/GeV, exceeding the design goal by 40%. Electron beams provided a calibration of the modules at the electromagnetic energy scale. Over 200 calorimeter cells the variation of the response was 2.4%. The linearity with energy was also measured. Muon beams provided an intercalibration of the response of all calorimeter cells. The response to muons entering in the ATLAS projective geometry showed an RMS variation of 2.5% for 91 measurements over a range of rapidities and modules. The mean response to hadrons of fixed energy had an RMS variation of 1.4% for the modules and projective angles studied. The response to hadrons normalized to incident beam energy showed an 8% increase between 10 and 350 GeV, fully consistent with expectations for a noncompensating calorimeter. The measured energy resolution for hadrons of ?/E=52.9%/E?5.7% was also consistent with expectations. Other auxiliary studies were made of saturation recovery of the readout system, the time resolution of the calorimeter and the performance of the trigger signals from the calorimeter.

Adragna, P.; Alexa, C.; Anderson, K.; Antonaki, A.; Arabidze, A.; Batkova, L.; Batusov, V.; Beck, H. P.; Bednar, P.; Bergeaas Kuutmann, E.; Biscarat, C.; Blanchot, G.; Bogush, A.; Bohm, C.; Boldea, V.; Bosman, M.; Bromberg, C.; Budagov, J.; Burckhart-Chromek, D.; Caprini, M.; Caloba, L.; Calvet, D.; Carli, T.; Carvalho, J.; Cascella, M.; Castelo, J.; Castillo, M. V.; Cavalli-Sforza, M.; Cavasinni, V.; Cerqueira, A. S.; Clement, C.; Cobal, M.; Cogswell, F.; Constantinescu, S.; Costanzo, D.; Corso-Radu, A.; Cuenca, C.; Damazio, D. O.; David, M.; Davidek, T.; de, K.; Del Prete, T.; di Girolamo, B.; Dita, S.; Djobava, T.; Dobson, M.; Dolejsi, J.; Dolezal, Z.; Dotti, A.; Downing, R.; Efthymiopoulos, I.; Eriksson, D.; Errede, D.; Errede, S.; Farbin, A.; Fassouliotis, D.; Febbraro, R.; Fedorko, I.; Fenyuk, A.; Ferdi, C.; Ferrer, A.; Flaminio, V.; Francis, D.; Fullana, E.; Gadomski, S.; Gameiro, S.; Garde, V.; Gellerstedt, K.; Giakoumopoulou, V.; Gildemeister, O.; Gilewsky, V.; Giokaris, N.; Gollub, N.; Gomes, A.; Gonzalez, V.; Gorini, B.; Grenier, P.; Gris, P.; Gruwe, M.; Guarino, V.; Guicheney, C.; Gupta, A.; Haeberli, C.; Hakobyan, H.; Haney, M.; Hellman, S.; Henriques, A.; Higon, E.; Holmgren, S.; Hurwitz, M.; Huston, J.; Iglesias, C.; Isaev, A.; Jen-La Plante, I.; Jon-And, K.; Joos, M.; Junk, T.; Karyukhin, A.; Kazarov, A.; Khandanyan, H.; Khramov, J.; Khubua, J.; Kolos, S.; Korolkov, I.; Krivkova, P.; Kulchitsky, Y.; Kurochkin, Yu; Kuzhir, P.; Le Compte, T.; Lefevre, R.; Lehmann, G.; Leitner, R.; Lembesi, M.; Lesser, J.; Li, J.; Liablin, M.; Lokajicek, M.; Lomakin, Y.; Lupi, A.; Maidanchik, C.; Maio, A.; Makouski, M.; Maliukov, S.; Manousakis, A.; Mapelli, L.; Marques, C.; Marroquim, F.; Martin, F.; Mazzoni, E.; Merritt, F.; Miagkov, A.; Miller, R.; Minashvili, I.; Miralles, L.; Montarou, G.; Mosidze, M.; Myagkov, A.; Nemecek, S.; Nessi, M.; Nodulman, L.; Nordkvist, B.; Norniella, O.; Onofre, A.; Oreglia, M.; Pallin, D.; Pantea, D.; Petersen, J.; Pilcher, J.; Pina, J.; Pinhão, J.; Podlyski, F.; Portell, X.; Poveda, J.; Pribyl, L.; Price, L. E.; Proudfoot, J.; Ramstedt, M.; Richards, R.; Roda, C.; Romanov, V.; Rosnet, P.; Roy, P.; Ruiz, A.; Rumiantsev, V.; Russakovich, N.; Saltó, O.; Salvachua, B.; Sanchis, E.; Sanders, H.; Santoni, C.; Santos, J.; Saraiva, J. G.; Sarri, F.; Satsunkevitch, I.; Says, L.-P.; Schlager, G.; Schlereth, J.; Seixas, J. M.; Selldèn, B.; Shalanda, N.; Shevtsov, P.; Shochet, M.; Silva, J.; da Silva, P.; Simaitis, V.; Simonyan, M.; Sissakian, A.; Sjölin, J.; Solans, C.; Solodkov, A.; Soloviev, I.; Solovyanov, O.; Sosebee, M.; Spanò, F.; Stanek, R.; Starchenko, E.; Starovoitov, P.; Stavina, P.; Suk, M.; Sykora, I.; Tang, F.; Tas, P.; Teuscher, R.; Tokar, S.; Topilin, N.; Torres, J.; Tremblet, L.; Tsiareshka, P.; Tylmad, M.; Underwood, D.; Unel, G.; Usai, G.; Valero, A.; Valkar, S.; Valls, J. A.; Vartapetian, A.; Vazeille, F.; Vichou, I.; Vinogradov, V.; Vivarelli, I.; Volpi, M.; White, A.; Zaitsev, A.; Zenine, A.; Zenis, T.

2009-07-01

8

Hadron calorimeters for future hadron colliders  

SciTech Connect

Hadron calorimeters are essential for jet and neutrino physics at collider experiments. Current hadron calorimeters for the ATLAS and CMS detectors are described. Increased energy and luminosity of future hadron colliders place constraints on detector technology. Difficulties for operation of the current detectors in future hadron collider environments are discussed. New experiments for future colliders should take notice of physics processes during jet evolution that place fundamental limits on performance of the calorimeter to reconstruct jets. A technique of incorporating tracking information to improve jet resolution is described. Future detectors should be designed with these constraints in mind. Possible avenues of exploration for future technology are described.

Jim Freeman

2004-01-27

9

Readiness of the ATLAS Tile Calorimeter for LHC collisions  

Microsoft Academic Search

The Tile hadronic calorimeter of the ATLAS detector has undergone extensive testing in the experimental hall since its installation\\u000a in late 2005. The readout, control and calibration systems have been fully operational since 2007 and the detector has successfully\\u000a collected data from the LHC single beams in 2008 and first collisions in 2009. This paper gives an overview of the

G. Aad; B. Abbott; J. Abdallah; A. A. Abdelalim; A. Abdesselam; O. Abdinov; B. Abi; M. Abolins; H. Abramowicz; H. Abreu; B. S. Acharya; T. N. Addy; J. Adelman; C. Adorisio; P. Adragna; T. Adye; S. Aefsky; J. A. Aguilar-Saavedra; M. Aharrouche; S. P. Ahlen; F. Ahles; A. Ahmad; M. Ahsan; G. Aielli; T. Akdogan; T. P. A. Åkesson; G. Akimoto; A. V. Akimov; A. Aktas; M. S. Alam; M. A. Alam; S. Albrand; M. Aleksa; I. N. Aleksandrov; C. Alexa; G. Alexander; G. Alexandre; T. Alexopoulos; M. Alhroob; M. Aliev; G. Alimonti; J. Alison; M. Aliyev; P. P. Allport; S. E. Allwood-Spiers; J. Almond; A. Aloisio; R. Alon; A. Alonso; M. G. Alviggi; K. Amako; C. Amelung; A. Amorim; G. Amorós; N. Amram; C. Anastopoulos; T. Andeen; C. F. Anders; K. J. Anderson; A. Andreazza; V. Andrei; X. S. Anduaga; A. Angerami; F. Anghinolfi; N. Anjos; A. Annovi; A. Antonaki; M. Antonelli; S. Antonelli; J. Antos; B. Antunovic; F. Anulli; S. Aoun; G. Arabidze; I. Aracena; Y. Arai; A. T. H. Arce; J. P. Archambault; S. Arfaoui; J.-F. Arguin; T. Argyropoulos; M. Arik; A. J. Armbruster; O. Arnaez; C. Arnault; A. Artamonov; D. Arutinov; M. Asai; S. Asai; R. Asfandiyarov; S. Ask; B. Åsman; D. Asner; L. Asquith; K. Assamagan; A. Astvatsatourov; G. Atoian; B. Auerbach; K. Augsten; M. Aurousseau; N. Austin; G. Avolio; R. Avramidou; C. Ay; G. Azuelos; Y. Azuma; M. A. Baak; A. M. Bach; H. Bachacou; K. Bachas; M. Backes; E. Badescu; P. Bagnaia; Y. Bai; T. Bain; J. T. Baines; O. K. Baker; M. D. Baker; S. Baker; F. Baltasar Dos Santos Pedrosa; E. Banas; P. Banerjee; S. Banerjee; D. Banfi; A. Bangert; V. Bansal; S. P. Baranov; A. Barashkou; T. Barber; E. L. Barberio; D. Barberis; M. Barbero; D. Y. Bardin; T. Barillari; M. Barisonzi; T. Barklow; N. Barlow; B. M. Barnett; R. M. Barnett; A. Baroncelli; A. J. Barr; F. Barreiro; P. Barrillon; R. Bartoldus; D. Bartsch; R. L. Bates; L. Batkova; J. R. Batley; A. Battaglia; M. Battistin; F. Bauer; H. S. Bawa; M. Bazalova; B. Beare; T. Beau; P. H. Beauchemin; R. Beccherle; P. Bechtle; G. A. Beck; H. P. Beck; M. Beckingham; K. H. Becks; A. J. Beddall; V. A. Bednyakov; C. Bee; M. Begel; S. Behar Harpaz; P. K. Behera; M. Beimforde; C. Belanger-Champagne; P. J. Bell; W. H. Bell; G. Bella; L. Bellagamba; F. Bellina; M. Bellomo; A. Belloni; K. Belotskiy; O. Beltramello; S. Ben Ami; O. Benary; D. Benchekroun; M. Bendel; B. H. Benedict; N. Benekos; Y. Benhammou; D. P. Benjamin; M. Benoit; J. R. Bensinger; K. Benslama; S. Bentvelsen; M. Beretta; D. Berge; E. Bergeaas Kuutmann; N. Berger; F. Berghaus; E. Berglund; J. Beringer; P. Bernat; R. Bernhard; C. Bernius; T. Berry; A. Bertin; M. I. Besana; N. Besson; S. Bethke; R. M. Bianchi; M. Bianco; O. Biebel; J. Biesiada; M. Biglietti; H. Bilokon; M. Bindi; A. Bingul; C. Bini; C. Biscarat; U. Bitenc; K. M. Black; R. E. Blair; J.-B. Blanchard; G. Blanchot; C. Blocker; A. Blondel; W. Blum; U. Blumenschein; G. J. Bobbink; A. Bocci; M. Boehler; J. Boek; N. Boelaert; S. Böser; J. A. Bogaerts; A. Bogouch; C. Bohm; J. Bohm; V. Boisvert; T. Bold; V. Boldea; V. G. Bondarenko; M. Bondioli; M. Boonekamp; S. Bordoni; C. Borer; A. Borisov; G. Borissov; I. Borjanovic; S. Borroni; K. Bos; D. Boscherini; M. Bosman; H. Boterenbrood; J. Bouchami; J. Boudreau; E. V. Bouhova-Thacker; C. Boulahouache; C. Bourdarios; A. Boveia; J. Boyd; I. R. Boyko; I. Bozovic-Jelisavcic; J. Bracinik; A. Braem; P. Branchini; A. Brandt; G. Brandt; O. Brandt; U. Bratzler; B. Brau; J. E. Brau; H. M. Braun; B. Brelier; J. Bremer; R. Brenner; S. Bressler; D. Britton; F. M. Brochu; I. Brock; R. Brock; E. Brodet; C. Bromberg; G. Brooijmans; W. K. Brooks; G. Brown; D. Bruncko; R. Bruneliere; S. Brunet; A. Bruni; G. Bruni; M. Bruschi; F. Bucci; J. Buchanan; P. Buchholz; A. G. Buckley; I. A. Budagov; B. Budick; V. Büscher; L. Bugge; O. Bulekov; M. Bunse; T. Buran; H. Burckhart; S. Burdin; T. Burgess; S. Burke; E. Busato; P. Bussey; C. P. Buszello; F. Butin; B. Butler; J. M. Butler; C. M. Buttar; J. M. Butterworth; T. Byatt; J. Caballero; S. Cabrera Urbán; D. Caforio; O. Cakir; P. Calafiura; G. Calderini; P. Calfayan; R. Calkins; L. P. Caloba; D. Calvet; P. Camarri; D. Cameron; S. Campana; M. Campanelli; V. Canale; F. Canelli; A. Canepa; J. Cantero; L. Capasso; M. D. M. Capeans Garrido; I. Caprini; M. Caprini; M. Capua; R. Caputo; C. Caramarcu; R. Cardarelli; T. Carli; G. Carlino; L. Carminati; B. Caron; S. Caron; G. D. Carrillo Montoya; S. Carron Montero; A. A. Carter; J. R. Carter; J. Carvalho; D. Casadei; M. P. Casado; M. Cascella; A. M. Castaneda Hernandez; E. Castaneda-Miranda; V. Castillo Gimenez; N. F. Castro; G. Cataldi; A. Catinaccio; J. R. Catmore; A. Cattai; G. Cattani; S. Caughron; P. Cavalleri; D. Cavalli; M. Cavalli-Sforza; V. Cavasinni; F. Ceradini; A. S. Cerqueira; A. Cerri; L. Cerrito; F. Cerutti; S. A. Cetin; A. Chafaq; D. Chakraborty; K. Chan; J. D. Chapman

2010-01-01

10

The CMS central hadron calorimeter  

SciTech Connect

The CMS central hadron calorimeter is a brass absorber/scintillator sampling structure. We describe details of the mechanical and optical structure. We also discuss calibration techniques, and finally the anticipated construction schedule.

Freeman, Jim [Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)

1998-11-09

11

Calibration of the CDF tile-fiber endplug calorimeters using moving radioactive sources  

NASA Astrophysics Data System (ADS)

The use of moving radioactive gamma sources to assess, calibrate and monitor scintillating tile calorimeters is discussed, and the techniques and equipment are described. The capabilities of the technique are illustrated using Cs137 sources with the CDF Endplug Upgrade EM and Hadron calorimeters at testbeams and at a cosmic ray test stand. Source measurements of all the tiles in testbeam modules which are exact replicas of the calorimeters, predict the relative responses of EM towers to 50 GeV positrons and muons, and of Hadron towers to 50 GeV pions, with RMS accuracies of 1.3%, 1.8% and 2.0%, respectively. Source measurements will be used in lieu of testbeam measurements for the initial calibration of all towers in the final calorimeters. Source measurements of single tiles are reproducible to 0.4% and will be used to monitor gain changes of the photomultiplier tubes.

Barnes, Virgil; Laasanen, Alvin; Pompos, Arnold; Wilson, Matthew

1998-11-01

12

Support girder design for the atlas hadron calorimeter.  

National Technical Information Service (NTIS)

The girder is the primary structural element of the Hadron Calorimeter. It provides the backbone of the Tile-Cal module and the basic construction reference for the assembly of the module. The girder also forms the outer radius support ring, when the indi...

N. F. Hill V. J. Guarino E. Petereit

1994-01-01

13

Construction and commissioning of the CALICE analog hadron calorimeter prototype  

Microsoft Academic Search

An analog hadron calorimeter (AHCAL) prototype of 5.3 nuclear interaction lengths thickness has been constructed by members of the CALICE Collaboration. The AHCAL prototype consists of a 38-layer sandwich structure of steel plates and highly-segmented scintillator tiles that are read out by wavelength-shifting fibers coupled to SiPMs. The signal is amplified and shaped with a custom-designed ASIC. A calibration\\/monitoring system

C. Adloff; Y. Karyotakis; J. Repond; A. Brandt; H. Brown; K. De; C. Medina; J. Smith; J. Li; M. Sosebee; A. White; J. Yu; T. Buanes; G. Eigen; Y. Mikami; O. Miller; N. K. Watson; J. A. Wilson; T. Goto; G. Mavromanolakis; M. A. Thomson; D. R. Ward; W. Yan; D. Benchekroun; A. Hoummada; Y. Khoulaki; M. Oreglia; M. Benyamna; C. Cârloganu; P. Gay; J. Ha; G. C. Blazey; D. Chakraborty; A. Dyshkant; K. Francis; D. Hedin; G. Lima; V. Zutshi; V. A. Babkin; S. N. Bazylev; Yu I. Fedotov; V. M. Slepnev; I. A. Tiapkin; S. V. Volgin; J.-Y. Hostachy; L. Morin; N. D'Ascenzo; U. Cornett; D. David; R. Fabbri; G. Falley; N. Feege; K. Gadow; E. Garutti; P. Göttlicher; T. Jung; S. Karstensen; V. Korbel; A.-I. Lucaci-Timoce; B. Lutz; N. Meyer; V. Morgunov; M. Reinecke; S. Schätzel; S. Schmidt; F. Sefkow; P. Smirnov; A. Vargas-Trevino; N. Wattimena; O. Wendt; M. Groll; R.-D. Heuer; S. Richter; J. Samson; A. Kaplan; H.-Ch Schultz-Coulon; W. Shen; A. Tadday; B. Bilki; E. Norbeck; Y. Onel; E. J. Kim; G. Kim; D.-W. Kim; K. Lee; S. C. Lee; K. Kawagoe; Y. Tamura; J. A. Ballin; P. D. Dauncey; A.-M. Magnan; H. Yilmaz; O. Zorba; V. Bartsch; M. Postranecky; M. Warren; M. Wing; M. Faucci Giannelli; M. G. Green; F. Salvatore; R. Kieffer; I. Laktineh; M. C. Fouz; D. S. Bailey; R. J. Barlow; R. J. Thompson; M. Batouritski; O. Dvornikov; Yu Shulhevich; N. Shumeiko; A. Solin; P. Starovoitov; V. Tchekhovski; A. Terletski; B. Bobchenko; M. Chadeeva; M. Danilov; O. Markin; R. Mizuk; E. Novikov; V. Rusinov; E. Tarkovsky; V. Andreev; N. Kirikova; A. Komar; V. Kozlov; Y. Soloviev; A. Terkulov; P. Buzhan; B. Dolgoshein; A. Ilyin; V. Kantserov; V. Kaplin; A. Karakash; E. Popova; S. Smirnov; N. Baranova; E. Boos; L. Gladilin; D. Karmanov; M. Korolev; M. Merkin; A. Savin; A. Voronin; A. Topkar; A. Frey; C. Kiesling; S. Lu; K. Prothmann; K. Seidel; F. Simon; C. Soldner; L. Weuste; B. Bouquet; S. Callier; P. Cornebise; F. Dulucq; J. Fleury; H. Li; G. Martin-Chassard; F. Richard; Ch de la Taille; R. Poeschl; L. Raux; M. Ruan; N. Seguin-Moreau; F. Wicek; M. Anduze; V. Boudry; J.-C. Brient; G. Gaycken; R. Cornat; D. Jeans; P. Mora de Freitas; G. Musat; M. Reinhard; A. Rougé; J.-Ch Vanel; H. Videau; K.-H. Park; J. Zacek; J. Cvach; P. Gallus; M. Havranek; M. Janata; J. Kvasnicka; M. Marcisovsky; I. Polak; J. Popule; L. Tomasek; M. Tomasek; P. Ruzicka; P. Sicho; J. Smolik; V. Vrba; J. Zalesak; Yu Arestov; V. Ammosov; B. Chuiko; V. Gapienko; Y. Gilitski; V. Koreshev; A. Semak; Yu Sviridov; V. Zaets; B. Belhorma; M. Belmir; A. Baird; R. N. Halsall; S. W. Nam; I. H. Park; J. Yang; J.-S. Chai; J.-T. Kim; Y. Kim; J. Kang; Y.-J. Kwon; I. Kim; T. Lee; J. Sung; S. Itoh; K. Kotera; M. Nishiyama; T. Takeshita; S. Weber; C. Zeitnitz

2010-01-01

14

Cosmic ray triggering using muon signal detected by the Hadronic Calorimeter of ATLAS  

Microsoft Academic Search

This paper presents the development of a matched filter syste m for muon detection using the muon output trigger signal, provided by the hadronic calorimeter of ATLAS detector, the Tile Calorimeter. A signal processing is done for this muon output to improve its signal-to-noise ratio and detection capability. The performance achieved for this system, using data from the testbeam period,

B. C. Ferreira; J. M. de Seixas; A. S. Cerqueira

15

The CMS central hadron calorimeter: Update  

SciTech Connect

The CMS central hadron calorimeter is a brass absorber/ scintillator sampling structure. We describe details of the mechanical and optical structure. We also discuss calibration techniques, and finally the anticipated construction schedule.

Freeman, J.

1998-06-01

16

Master plate production for the tile calorimeter extended barrel modules.  

SciTech Connect

Approximately 41,000 master plates (Fig. 1) are required for the Extended Barrel Hadronic Calorimeter for the ATLAS experiment at the LHC. Early in the R&D program associated with the detector, it was recognized that the fabrication of these steel laminations was a significant issue, both in terms of the cost to produce these high precision formed plates, as well as the length of time required to produce all plates for the calorimeter. Two approaches were given serious consideration: laser cutting and die stamping. The Argonne group was a strong supporter of the latter approach and in late 1995 initiated an R&D program to demonstrate the feasibility and cost effectiveness of die stamping these plates by constructing a die and stamping approximately 2000 plates for use in construction of three full size prototype modules. This was extremely successful and die stamping was selected by the group for production of these plates. When the prototype die was constructed it was matched to the calorimeter envelope at that time. This subsequently changed. However with some minor adjustments in the design envelope and a small compromise in terms of instrumented volume, it became possible to use this same die for the production of all master plates for the Tile Calorimeter. Following an extensive series of discussions and an evaluation of the performance of the stamping presses available to our collaborators in Europe, it was decided to ship the US die to CERN for use in stamping master plates for the barrel section of the calorimeter. This was done under the supervision of CERN and JINR, Dubna, and carried out at the TATRA truck plant at Koprivinice, Czech Republic. It was a great success. Approximately 41,000 plates were stamped and fully met specification. Moreover, the production time was significantly reduced by avoiding the need of constructing and then qualifying a second die for use in Europe. This also precluded small geometrical differences between the barrel and extended barrel plates (and therefore submodules) being an issue, with the result that standard submodules are fully exchangeable between the two types of module.

Guarino, V.J.; Hill, N.; Petereit, E.; Price, L.E.; Proudfoot, J.; Wood, K.

1999-03-10

17

QCALT: A tile calorimeter for KLOE-2 upgrade  

NASA Astrophysics Data System (ADS)

The upgrade of the Da?ne machine layout requires a modification of the size and position of the inner focusing quadrupoles of KLOE-2, thus asking for the realization of two new calorimeters, named QCALT, covering this area. To improve the reconstruction of KL?2?0 events with photons hitting the quadrupoles, a calorimeter with high efficiency to low energy photons (20–300 MeV), time resolution of less than 1 ns and space resolution of few cm, is needed. To match these requirements we are now constructing a scintillator tile calorimeter where each single tile is readout by mean of SiPM for a total granularity of 1760 channels. We show the design of the different calorimeter components and the present status of the construction.

Balla, A.; Ciambrone, P.; Corradi, G.; Martini, M.; Paglia, C.; Pileggi, G.; Ponzio, B.; Saputi, A.; Tagnani, D.

2013-08-01

18

Forward hadron calorimeter for measurements of projectile spectators in heavy-ion experiment  

SciTech Connect

The construction and performance of a modular hadron calorimeter for NA61 experiment at CERN are described. The calorimeter consists of individual lead/scintillator sandwich modules with the sampling satisfying the compensating condition. The light from the individual scintillator tiles is captured and transported with the WLS-fibers embedded in the scintillator grooves. The light readout is done by avalanche micro-pixel photodiodes. The construction ensures a fine transverse granulation of the calorimeter and a longitudinal segmentation of each module in 10 independent sections. The results of beam tests of the calorimeter prototype are presented.

Golubeva, M. B., E-mail: marina@inr.ru; Guber, F. F., E-mail: guber@inr.ru; Ivashkin, A. P., E-mail: ivashkin@inr.ru; Kurepin, A. B., E-mail: kurepin@inr.ru; Marin, V. N., E-mail: marin@inr.ru; Sadovsky, A. S., E-mail: sadovsky@inr.ru; Petukhov, O. A., E-mail: opetukhov@inr.ru [Institute for Nuclear Research RAS (Russian Federation)

2012-06-15

19

Compensating hadron calorimeters with Cerenkov light  

SciTech Connect

Many future high energy experiments anticipate the need for large compensated hadron calorimeters. The authors are attracted to homogeneous absorption calorimeters for hadrons by potential gains in simplicity, hermeticity, ease of calibration and a potential reduction in sampling fluctuations when compared to layered structures. However the excellent compensation possible by heterogeneous stacking of inert absorbers and active ionization layers is impossible in homogeneous calorimeters by the detection of ionization alone. Because only a small fraction (-- 10%) of the energy deposition in the purely hadronic portion of a hadron shower is by minimum ionizing particles, they have investigated the possibility of compensating calorimetry in homogeneous transparent materials by measuring separately the ionization energy (by scintillation or drifted ions) and the Cerenkov light, in order to separate the electromagnetic fluctuations in the shower, thereby correcting calorimeter response. They discuss potential media and methods to accomplish this, together with calculated responses. The advantages/disadvantages in construction, hermeticity, speed, radiation hardness, stability, segmentation, calibration, triggers, containment and simplicity are compared with SSC calorimeter plans.

Winn, D.R.

1989-02-01

20

Sources of compensation in hadronic calorimeters  

NASA Astrophysics Data System (ADS)

Monte Carlo simulations are presented using the CALOR code system to study the design of a large hybrid hadron calorimeter system employing a warm liquid active medium (tetramethylsilane, Si(CH3)4) and uranium plates in addition to a conventional Fe/plastic system. In the system described here, the uranium provides partial compensation by suppressing the electromagnetic cascade produced by incident electrons due to sampling inefficiencies. The results of the simulations also indicate that significant compensation is achieved (given small enough saturation) due to low energy recoil protons produced in collisions with low energy (1-20 MeV) cascade and fission neutrons in the active medium. Both compensation mechanisms are important to help balance the response of a calorimeter to incident electrons and hadrons, that is, to achieve a ratio of pulse heights (e/h ~ 1) which will lead to th best energy resolution. Department of Physics, Harvard University, Cambridge, MA 02138, USA.

Goodman, M. S.; Gabriel, T. A.; di Ciaccio, A.; Wilson, R.

1989-06-01

21

HARDROC: Readout chip for CALICE\\/EUDET Digital Hadronic Calorimeter  

Microsoft Academic Search

HARDROC [1] (HAdronic Rpc Detector Read Out Chip) is the very front end chip designed for the readout of the RPC or Micromegas foreseen for the Digital HAdronic CALorimeter (DHCAL) of the future International Linear Collider and designed within the CALICE collaboration [2]. The very fine granularity of the ILC hadronic calorimeters (1cm2 pads) implies a huge number of electronics

Frederic Dulucq; Christophe de La Taille; Gisele Martin-Chassard; Nathalie Seguin-Moreau

2010-01-01

22

Upgrade fo the CMS Hadron Outer Calorimeter with SIPMs  

SciTech Connect

The CMS Hadron Outer Calorimeter (HO) is undergoing an upgrade to replace the existing photodetectors (HPDs) with SIPMs. The chosen device is the Hamamatsu 3 x 3mm 50 {mu}m pitch MPPC. The system has been developed to be a 'drop-in' replacement of the HPDs. A complete control system of bias voltage generation, leakage current monitoring, temperature monitoring, and temperature control using solid state Peltier coolers has been developed and tested. 108 channels of the system have been installed into CMS and operated for more than 2 years. The complete system of about 2200 channels is in production and will be installed in the next LHC long shutdown scheduled for 2013. The CMS central calorimeter consists of a detector inside the solenoidal magnet, HB, and a component outside the magnet, the Outer Hadron Calorimeter, HO [1]. The HO is installed inside the magnet flux return yoke and provides for typically 3{lambda} of additional absorber to the calorimetric measurement. The outer calorimeter is composed of one or more layers of scintillator with wavelength shifting fiber readout into photodetectors. Figure 1 (a) shows the schematic layout of the calorimeters in CMS and shows the location of the HO scintillator layers. The front end electronics are placed inside the CMS detector, close to the scintillators. Figure 1(b) shows a photograph of the scintillators. Note the four wavelength shifting fibers per tile. The tile size creates a projective tower with the HB. Currently the photodetector used is the HPD but for performance and operational reasons it is desired to upgrade these with SIPMs. The CMS HCAL group has developed a drop-in replacement for the HPD using SIPMs. SIPMs are very suitable for this application because of several factors: The radiation levels are modest with a lifetime expected fluence of less than 5*10{sup 11} neutrons (E > 100 KeV) per cm{sup 2}. The energy flux into HO is small, the rate of larger energy depositions is low, and the required dynamic range is modest. The HO is in the return magnetic field of up to 2KG and the photodetector needs to operate in that environment. Finally, the available physical volume for the photodetectors is small.

Anderson, Jacob; Freeman, James; Los, Sergey; Whitmore, Juliana; /Fermilab

2011-09-14

23

A scintillating tile/fiber system for the CDF plug upgrade EM calorimeter  

NASA Astrophysics Data System (ADS)

The plug calorimeter of the Collider Detector at Fermilab (CDF) [1] will be upgraded, replacing the existing gas calorimeter by a scintillating tile/fiber calorimeter. We have completed R&D for the CDF plug upgrade EM calorimeter. We describe the results of the R&D leading to the final design of the tile/fiber system for the calorimeter. Kuraray SCSN38, Kuraray Y11 and PET film (E65) were chosen as materials for scintillating tiles, wavelength shifting (WLS) fibers and a surface reflector on tiles, respectively, in view of obtaining large light yield and uniform response from a tile/fiber system. We decided fiber groove path in a tile, groove cross-sectional shape and groove depth for each tile to get uniform response from a tile/fiber. For the tile/fiber system of the final design, the average light yield was larger than 3.0 photoelectrons per minimum ionizing particle (MIP), the response uniformity in a tile was less than 2.5% and a total cross talk from a tile to the adjacent tiles was less than 2.0%. These results satisfied our requirements.

Aota, S.; Asakawa, T.; Hara, K.; Hayashi, E.; Kim, S.; Kondo, K.; Kuwabara, T.; Miyashita, S.; Nakada, H.; Nakano, I.; Seiya, Y.; Takikawa, K.; Toyoda, H.; Uchida, T.; Yasuoka, K.; Mishina, M.; Iwai, J.; Albrow, M.; Freeman, J.; Limon, P. J.

1995-01-01

24

Test beam performance of the CDF plug upgrade hadron calorimeter  

SciTech Connect

We report on the performance of the CDF End Plug Hadron Calorimeter in a test beam. The sampling calorimeter is constructed using 2 inch iron absorber plates and scintillator planes with wavelength shifting fibers for readout. The linearity and energy resolution of the calorimeter response to pions, and the transverse uniformity of the response to muons and pions are presented. The parameter e/h, representing the ratio of the electromagnetic to hadronic response, is extracted from the data.

de Barbaro, P. [Rochester Univ., NY (United States); CDF Plug Upgrade Group

1998-01-13

25

Electromagnetic and hadron calorimeters in the MIPP experiment  

SciTech Connect

The purpose of the MIPP experiment is to study the inclusive production of photons, pions, kaons, and nucleons in {pi}, K, and p interactions on various targets using beams from the Main Injector at Fermilab. The function of the calorimeters is to measure the production of forward-going neutrons and photons. The electromagnetic calorimeter consists of 10 lead plates interspersed with proportional chambers. It was followed by the hadron calorimeter with 64 steel plates interspersed with scintillator. The data presented were collected with a variety of targets and beam momenta from 5 to 120 GeV/c. The energy calibration of both calorimeters with electrons, pions, kaons, and protons is discussed. The resolution for electrons was found to be 0.27/{radical}E, and for hadrons the resolution was 0.554/{radical}E with a constant term of 2.6%. The performance of the calorimeters was tested on a neutron sample.

Nigmanov, T.S.; Gustafson, H.R.; Longo, M.J.; Park, H.K.; Rajaram, D.; /Michigan U.; Dukes, C.; Lu, L.C.; Materniak, C.; Nelson, K.; Norman, A.; /Virginia U.; Meyer, H.; /Fermilab /Harvard U. /Indiana U. /Iowa U. /Purdue U.

2008-10-01

26

The effect of passive material on the detection of hadrons in calorimeter configurations for the SDC detector  

SciTech Connect

We have used a flexible geometry model of a calorimeter design for SDC to study the effect of passive material in front of the calorimeter and between the barrel and endcap modules on the apparent response to hadrons. The thicknesses of the passive materials have been chosen to closely resemble the currently projected wall thicknesses of the scintillating tile-fiber and liquid-argon calorimeter designs. The liquid-argon model contains about three times the amount of material in its shells compared to the tile-fiber model. The solenoid coil reduces the relative difference somewhat in the barrel region but constitutes only a minor correction in the transition region from barrel to endcap. Correspondingly, we find a significantly worse response for the liquid-argon case which we demonstrate using beams of single {pi}{sup minus} particles of 10 GeV/c momentum. 13 refs., 6 figs.

Kirk, T.B.W.; Trost, H.J.

1991-08-14

27

Track segments in hadronic showers in a highly granular scintillator-steel hadron calorimeter  

NASA Astrophysics Data System (ADS)

We investigate the three dimensional substructure of hadronic showers in the CALICE scintillator-steel hadronic calorimeter. The high granularity of the detector is used to find track segments of minimum ionising particles within hadronic showers, providing sensitivity to the spatial structure and the details of secondary particle production in hadronic cascades. The multiplicity, length and angular distribution of identified track segments are compared to GEANT4 simulations with several different shower models. Track segments also provide the possibility for in-situ calibration of highly granular calorimeters.

Adloff, C.; Blaising, J.-J.; Chefdeville, M.; Drancourt, C.; Gaglione, R.; Geffroy, N.; Karyotakis, Y.; Koletsou, I.; Prast, J.; Vouters, G.; Francis, K.; Repond, J.; Schlereth, J.; Smith, J.; Xia, L.; Baldolemar, E.; Li, J.; Park, S. T.; Sosebee, M.; White, A. P.; Yu, J.; Eigen, G.; Mikami, Y.; Watson, N. K.; Mavromanolakis, G.; Thomson, M. A.; Ward, D. R.; Yan, W.; Benchekroun, D.; Hoummada, A.; Khoulaki, Y.; Apostolakis, J.; Dannheim, D.; Dotti, A.; Folger, G.; Ivantchenko, V.; Klempt, W.; van der Kraaij, E.; Lucaci-Timoce, A.-I.; Ribon, A.; Schlatter, D.; Uzhinskiy, V.; Cârloganu, C.; Gay, P.; Manen, S.; Royer, L.; Tytgat, M.; Zaganidis, N.; Blazey, G. C.; Dyshkant, A.; Lima, J. G. R.; Zutshi, V.; Hostachy, J.-Y.; Morin, L.; Cornett, U.; David, D.; Falley, G.; Gadow, K.; Göttlicher, P.; Günter, C.; Hartbrich, O.; Hermberg, B.; Karstensen, S.; Krivan, F.; Krüger, K.; Lu, S.; Morozov, S.; Morgunov, V.; Reinecke, M.; Sefkow, F.; Smirnov, P.; Terwort, M.; Feege, N.; Garutti, E.; Laurien, S.; Marchesini, I.; Matysek, M.; Ramilli, M.; Briggl, K.; Eckert, P.; Harion, T.; Schultz-Coulon, H.-Ch; Shen, W.; Stamen, R.; Bilki, B.; Norbeck, E.; Onel, Y.; Wilson, G. W.; Kawagoe, K.; Sudo, Y.; Yoshioka, T.; Dauncey, P. D.; Magnan, A.-M.; Bartsch, V.; Wing, M.; Salvatore, F.; Cortina Gil, E.; Mannai, S.; Baulieu, G.; Calabria, P.; Caponetto, L.; Combaret, C.; Della Negra, R.; Grenier, G.; Han, R.; Ianigro, J.-C.; Kieffer, R.; Laktineh, I.; Lumb, N.; Mathez, H.; Mirabito, L.; Petrukhin, A.; Steen, A.; Tromeur, W.; Vander Donckt, M.; Zoccarato, Y.; Calvo Alamillo, E.; Fouz, M.-C.; Puerta-Pelayo, J.; Corriveau, F.; Bobchenko, B.; Chadeeva, M.; Danilov, M.; Epifantsev, A.; Markin, O.; Mizuk, R.; Novikov, E.; Popov, V.; Rusinov, V.; Tarkovsky, E.; Kirikova, N.; Kozlov, V.; Smirnov, P.; Soloviev, Y.; Buzhan, P.; Ilyin, A.; Kantserov, V.; Kaplin, V.; Karakash, A.; Popova, E.; Tikhomirov, V.; Kiesling, C.; Seidel, K.; Simon, F.; Soldner, C.; Szalay, M.; Tesar, M.; Weuste, L.; Amjad, M. S.; Bonis, J.; Callier, S.; Conforti di Lorenzo, S.; Cornebise, P.; Doublet, Ph; Dulucq, F.; Fleury, J.; Frisson, T.; van der Kolk, N.; Li, H.; Martin-Chassard, G.; Richard, F.; de la Taille, Ch; Pöschl, R.; Raux, L.; Rouëné, J.; Seguin-Moreau, N.; Anduze, M.; Balagura, V.; Boudry, V.; Brient, J.-C.; Cornat, R.; Frotin, M.; Gastaldi, F.; Guliyev, E.; Haddad, Y.; Magniette, F.; Musat, G.; Ruan, M.; Tran, T. H.; Videau, H.; Bulanek, B.; Zacek, J.; Cvach, J.; Gallus, P.; Havranek, M.; Janata, M.; Kvasnicka, J.; Lednicky, D.; Marcisovsky, M.; Polak, I.; Popule, J.; Tomasek, L.; Tomasek, M.; Ruzicka, P.; Sicho, P.; Smolik, J.; Vrba, V.; Zalesak, J.; Belhorma, B.; Ghazlane, H.; Kotera, K.; Takeshita, T.; Uozumi, S.; Jeans, D.; Götze, M.; Sauer, J.; Weber, S.; Zeitnitz, C.

2013-09-01

28

Detector Design for the sPHENIX Hadronic Calorimeter  

NASA Astrophysics Data System (ADS)

The sPHENIX detector proposal, for precision jet measurements in heavy ion collisions at RHIC, requires a large coverage hadronic calorimeter. The design must be compact and incorporate the magnetic field flux return, thus requiring the electronics to operate in a magnetic field. The current design incorporates alternating plates of steel and plastic scintillator, with embedded wavelength shifting fiber optics to transmit photons to silicon photomultipliers (SiPMs). Our goal is to optimize the light collection and ensure uniform light yield in the prototype hadronic calorimeter. We report on tests involving embedding fiber optics, light collection into SiPMs, and uniformity testing of scintillator panels.

Beckman, Shawn

2013-04-01

29

Some fiber-tile optical studies for SDC electromagnetic calorimeter  

SciTech Connect

A number of different issues have been studied at Argonne for development of the fiber-tile optical system for SDC EM. Results on uniformity, masking and wrapping, beveled tiles, timing, fiber damage, and pressure on the scintillator are presented. The instrumentation and techniques are also briefly discussed.

Underwood, D.G.

1992-01-01

30

Some fiber-tile optical studies for SDC electromagnetic calorimeter  

SciTech Connect

A number of different issues have been studied at Argonne for development of the fiber-tile optical system for SDC EM. Results on uniformity, masking and wrapping, beveled tiles, timing, fiber damage, and pressure on the scintillator are presented. The instrumentation and techniques are also briefly discussed.

Underwood, D.G.

1992-11-01

31

Web System for Data Quality Assessment of Tile Calorimeter During the ATLAS Operation  

NASA Astrophysics Data System (ADS)

TileCal, the barrel hadronic calorimeter of the ATLAS experiment, gathers almost about 10,000 electronic channels. The supervision of the detector behavior is very important in order to ensure proper operation. Collaborators perform analysis over reconstructed data of calibration runs for giving detailed considerations about the equipment status. During the commissioning period, our group has developed seven web systems to support the data quality (DQ) assessment task. Each system covers a part of the process by providing information on the latest runs, displaying the DQ status from the monitoring framework, giving details about power supplies operation, presenting the generated plots and storing the validation outcomes, assisting to write logbook entries, creating and submitting the bad channels list to the conditions database and publishing the equipment performance history. The ATLAS operation increases amount of data that are retrieved, processed and stored by the web systems. In order to accomplish the new requirements, an optimized data model was designed to reduce the number of needed queries. The web systems were reassembled in a unique system in order to provide an integrated view of the validating process. The server load was minimized by using asynchronous requests from the browser.

Maidantchik, C.; Ferreira, F.; Grael, F.; Sivolella, A.; Balabram, L.; ATLAS TILE Calorimeter Community

2011-12-01

32

Plate stamping of masterplates for the Tile-Cal hadronic calorimetric for ATLAS detector at CERN  

SciTech Connect

Various methods have been explored for the fabrication of the large trapezoidal plates used in the construction of the Tile-Cal hadronic calorimeter for ATLAS. The options include die stamping, laser cutting, waterjet cutting, plasma arc cutting, and a combination of machining and laser cutting. Very early in the program, the Argonne group began investigating the possibility of die stamping the master plates. At that time it was felt that two dies would be necessary to achieve the accuracy required. Quotations were received for dies for both the master and spacer plates. Concern was expressed by many members of the collaboration that due to the very precise tolerances required, die stamping, using standard dies, would not be adequate. Fine blanking techniques were felt to be adequate, but were cost prohibitive. Two methods were finally used for the initial cutting of prototype plates, laser cutting and die stamping. Only the die stamping, will be reviewed here.

Hill, N.F.; Petereit, E.; Wood, K.; Proudfoot, J.

1996-05-16

33

Test of interaction models with the KASCADE hadron calorimeter  

NASA Astrophysics Data System (ADS)

The interpretation of extensive air shower measurements often requires the comparison with EAS simulations. These calculations rely on hadronic interaction models which have to extrapolate into kinematical and energy regions not covered by present-day collider experiments. The KASCADE experiment with its large hadron calorimeter and its detectors for the electromagnetic and muonic components provides experimental data to check hadronic interaction models. For the EAS simulations the program CORSIKA with several hadronic event generators embedded is used. Different hadronic observables are investigated as well as their correlations with the electromagnetic and muonic components. Comparing the interaction models QGSJET 98, NEXUS II, and DPMJET 11.5, it is found, that QGSJET describes the data best.

Milkea, J.; Antonib, T.; Apel, W. D.; Badea, F.; Bekk, K.; Bercuci, A.; Blümer, H.; Bozdog, H.; Brancus, I. M.; Büttner, C.; Chilingarian, A.; Daumiller, K.; Doll, P.; Engler, J.; Feßler, F.; Gils, H. J.; Glasstetter, R.; Haeusler, R.; Haungs, A.; Heck, D.; Hörandel, J. R.; Iwan, A.; Kampert, K.-H.; Klages, H. O.; Maier, G.; Mathes, H. J.; Mayer, H. J.; Müller, M.; Obenland, R.; Oehlschlägera, J.; Ostapchenko, S.; Petcu, M.; Rebel, H.; Risse, M.; Roth, M.; Schatz, G.; Schieler, H.; Scholz, J.; Thouw, T.; Ulrich, H.; Weber, J. H.; Weindl, A.; Wentz, J.; Wochele, J.; Zabierowski, J.

2003-07-01

34

The aluminization of 600 k WLS fibers for the TileCal\\/ATLAS\\/LHC  

Microsoft Academic Search

The TILE CALorimeter, the hadronic sampling calorimeter of ATLAS\\/LHC\\/CERN, is made of iron and polystyrene scintillating tiles. The light produced in scintillating tiles is absorbed and guided to the photomultipliers (PMTs) through wave length shifter (WLS) optical fibers. To optimize the detection of jets and muons, the top of the fibers away of the PMTs is coated with an aluminum

J. G. Saraiva; A. Wemans; M. J. P. Maneira; A. Maio; J. Patriarca

2004-01-01

35

Estimation of hadronic and EM resolution for scintillator plate calorimeter configurations.  

National Technical Information Service (NTIS)

CALOR89 Simulation code has been used to estimate the hadronic and electromagnetic resolutions for the various scintillator plate calorimeter configurations. The goal of this study was to determine the optimum combination of Lead and Iron based calorimete...

P. K. Job J. Proudfoot

1991-01-01

36

Beam test of radiation hardness of a scintillating tile\\/fiber calorimeter  

Microsoft Academic Search

Radiation hardness of a scintillating tile\\/fiber calorimeter is studied by irradiating electromagnetic test modules with 2.5 GeV electrons at the KEK linac. The induced damage is evaluated in a 2 GeV electron test beam by measuring the reduction in pulse height after irradiation. The pulse height peak for 2 GeV electrons is found to decrease by 19.3 +\\/- 1.3% for

S. Funaki; K. Hara; T. Iinuma; T. Kaneko; S. Kim; K. Kondo; Y. Miyamoto; S. Miyashita; Y. Morita; I. Nakano; M. Okabe; J. Suzuki; H. Takahashi; K. Takikawa; N. Uemura; K. Yasuoka; F. Abe; A. Asami; A. Enomoto; K. Furukawa; N. Kamikubota; T. Kamitani; H. Kobayashi; M. Mishina; S. Ohsawa; Y. Yoshimura

1992-01-01

37

Study on the compensated lead hadron calorimeter characteristics by means of hadron and electron beams  

NASA Astrophysics Data System (ADS)

The results on measuring the basic characteristics of a compensated lead calorimeter (NEPTUN experiment) in a hadron and electron beam are presented. A prototype consisting of 30 modulus was used in the measurements. The energy resolution follows the dependence approximately = 57%/sq. root of E, the detector uniformity is (+-)5%, the measured e/h ratio is close to unity.

Alekseev, G. A.; Apokin, V. D.; Buyanov, O. V.

38

End Cap Calorimeter Inner Hadronic Module Installation  

SciTech Connect

The fixture used to hold the IH module while the EC Calorimeter is pul led over it consists of two tripod frames with a double wide flange between them. The two tripods have legs made of 6-inch Schedule 40 pipe, these legs are tied together with 2-inch Schedule 40 pipe. One of the legs sits on and is attached to a box made of 3/4-inch plates. The fixture was analyzed using ANSYS. The element used was a 3-D beam (STIF4). Equivalent properties were figured for the double wide flange. The legs of the tripods were constrained in the Y direction (vertical). The box at the bottom of the tripod leg was not used in this analysis, the leg was constrained at the point of attachment to the box. The cross beam was loaded at two points representing the IH load. The reaction force at the point where the tripod leg attaches to the box was then used in an analysis of the box itself. The box was modeled using plate elements (STIF63). The bottom of the box was constrained in the Y (vertical) direction. The top of the box was loaded in roughly a circular area to represent the pipe attachment area. The reaction force from the previous analysis was divided among these nodes.

Stredde, H.J.; /Fermilab

1990-10-11

39

Hadronic energy resolution of a highly granular scintillator-steel hadron calorimeter using software compensation techniques  

NASA Astrophysics Data System (ADS)

The energy resolution of a highly granular 1 m3 analogue scintillator-steel hadronic calorimeter is studied using charged pions with energies from 10 GeV to 80 GeV at the CERN SPS. The energy resolution for single hadrons is determined to be approximately 58%/?E/GeV. This resolution is improved to approximately 45%/?E/GeV with software compensation techniques. These techniques take advantage of the event-by-event information about the substructure of hadronic showers which is provided by the imaging capabilities of the calorimeter. The energy reconstruction is improved either with corrections based on the local energy density or by applying a single correction factor to the event energy sum derived from a global measure of the shower energy density. The application of the compensation algorithms to geant4 simulations yield resolution improvements comparable to those observed for real data.

Adloff, C.; Blaha, J.; Blaising, J.-J.; Drancourt, C.; Espargilière, A.; Gaglione, R.; Geffroy, N.; Karyotakis, Y.; Prast, J.; Vouters, G.; Francis, K.; Repond, J.; Smith, J.; Xia, L.; Baldolemar, E.; Li, J.; Park, S. T.; Sosebee, M.; White, A. P.; Yu, J.; Buanes, T.; Eigen, G.; Mikami, Y.; Watson, N. K.; Goto, T.; Mavromanolakis, G.; Thomson, M. A.; Ward, D. R.; Yan, W.; Benchekroun, D.; Hoummada, A.; Khoulaki, Y.; Benyamna, M.; Cârloganu, C.; Fehr, F.; Gay, P.; Manen, S.; Royer, L.; Blazey, G. C.; Dyshkant, A.; Lima, J. G. R.; Zutshi, V.; Hostachy, J.-Y.; Morin, L.; Cornett, U.; David, D.; Falley, G.; Gadow, K.; Göttlicher, P.; Günter, C.; Hermberg, B.; Karstensen, S.; Krivan, F.; Lucaci-Timoce, A.-I.; Lu, S.; Lutz, B.; Morozov, S.; Morgunov, V.; Reinecke, M.; Sefkow, F.; Smirnov, P.; Terwort, M.; Vargas-Trevino, A.; Feege, N.; Garutti, E.; Marchesini, I.; Ramilli, M.; Eckert, P.; Harion, T.; Kaplan, A.; Schultz-Coulon, H.-Ch; Shen, W.; Stamen, R.; Tadday, A.; Bilki, B.; Norbeck, E.; Onel, Y.; Wilson, G. W.; Kawagoe, K.; Dauncey, P. D.; Magnan, A.-M.; Wing, M.; Salvatore, F.; Calvo Alamillo, E.; Fouz, M.-C.; Puerta-Pelayo, J.; Balagura, V.; Bobchenko, B.; Chadeeva, M.; Danilov, M.; Epifantsev, A.; Markin, O.; Mizuk, R.; Novikov, E.; Rusinov, V.; Tarkovsky, E.; Kirikova, N.; Kozlov, V.; Smirnov, P.; Soloviev, Y.; Buzhan, P.; Dolgoshein, B.; Ilyin, A.; Kantserov, V.; Kaplin, V.; Karakash, A.; Popova, E.; Smirnov, S.; Kiesling, C.; Pfau, S.; Seidel, K.; Simon, F.; Soldner, C.; Szalay, M.; Tesar, M.; Weuste, L.; Bonis, J.; Bouquet, B.; Callier, S.; Cornebise, P.; Doublet, Ph; Dulucq, F.; Faucci Giannelli, M.; Fleury, J.; Li, H.; Martin-Chassard, G.; Richard, F.; de la Taille, Ch; Pöschl, R.; Raux, L.; Seguin-Moreau, N.; Wicek, F.; Anduze, M.; Boudry, V.; Brient, J.-C.; Jeans, D.; Mora de Freitas, P.; Musat, G.; Reinhard, M.; Ruan, M.; Videau, H.; Bulanek, B.; Zacek, J.; Cvach, J.; Gallus, P.; Havranek, M.; Janata, M.; Kvasnicka, J.; Lednicky, D.; Marcisovsky, M.; Polak, I.; Popule, J.; Tomasek, L.; Tomasek, M.; Ruzicka, P.; Sicho, P.; Smolik, J.; Vrba, V.; Zalesak, J.; Belhorma, B.; Ghazlane, H.; Takeshita, T.; Uozumi, S.; Sauer, J.; Weber, S.; Zeitnitz, C.

2012-09-01

40

Measurement of pion and proton response and longitudinal shower profiles up to 20 nuclear interaction lengths with the ATLAS Tile calorimeter  

NASA Astrophysics Data System (ADS)

The response of pions and protons in the energy range of 20-180 GeV, produced at CERN's SPS H8 test-beam line in the ATLAS iron-scintillator Tile hadron calorimeter, has been measured. The test-beam configuration allowed the measurement of the longitudinal shower development for pions and protons up to 20 nuclear interaction lengths. It was found that pions penetrate deeper in the calorimeter than protons. However, protons induce showers that are wider laterally to the direction of the impinging particle. Including the measured total energy response, the pion-to-proton energy ratio and the resolution, all observations are consistent with a higher electromagnetic energy fraction in pion-induced showers. The data are compared with GEANT4 simulations using several hadronic physics lists. The measured longitudinal shower profiles are described by an analytical shower parametrization within an accuracy of 5-10%. The amount of energy leaking out behind the calorimeter is determined and parametrized as a function of the beam energy and the calorimeter depth. This allows for a leakage correction of test-beam results in the standard projective geometry.

Adragna, P.; Alexa, C.; Anderson, K.; Antonaki, A.; Arabidze, A.; Batkova, L.; Batusov, V.; Beck, H. P.; Bergeaas Kuutmann, E.; Biscarat, C.; Blanchot, G.; Bogush, A.; Bohm, C.; Boldea, V.; Bosman, M.; Bromberg, C.; Budagov, J.; Burckhart-Chromek, D.; Caprini, M.; Caloba, L.; Calvet, D.; Carli, T.; Carvalho, J.; Cascella, M.; Castelo, J.; Castillo, M. V.; Cavalli-Sforza, M.; Cavasinni, V.; Cerqueira, A. S.; Clement, C.; Cobal, M.; Cogswell, F.; Constantinescu, S.; Costanzo, D.; Corso-Radu, A.; Cuenca, C.; Damazio, D. O.; Davidek, T.; de, K.; Del Prete, T.; di Girolamo, B.; Dita, S.; Djobava, T.; Dobson, M.; Dotti, A.; Downing, R.; Efthymiopoulos, I.; Eriksson, D.; Errede, D.; Errede, S.; Farbin, A.; Fassouliotis, D.; Febbraro, R.; Fenyuk, A.; Ferdi, C.; Ferrer, A.; Flaminio, V.; Francis, D.; Fullana, E.; Gadomski, S.; Gameiro, S.; Garde, V.; Gellerstedt, K.; Giakoumopoulou, V.; Gildemeister, O.; Gilewsky, V.; Giokaris, N.; Gollub, N.; Gomes, A.; Gonzalez, V.; Gorini, B.; Grenier, P.; Gris, P.; Gruwe, M.; Guarino, V.; Guicheney, C.; Gupta, A.; Haeberli, C.; Hakobyan, H.; Haney, M.; Hellman, S.; Henriques, A.; Higon, E.; Holmgren, S.; Hurwitz, M.; Huston, J.; Iglesias, C.; Isaev, A.; Jen-La Plante, I.; Jon-And, K.; Joos, M.; Junk, T.; Karyukhin, A.; Kazarov, A.; Khandanyan, H.; Khramov, J.; Khubua, J.; Kolos, S.; Korolkov, I.; Krivkova, P.; Kulchitsky, Y.; Kurochkin, Yu.; Kuzhir, P.; Le Compte, T.; Lefevre, R.; Lehmann, G.; Leitner, R.; Lembesi, M.; Lesser, J.; Li, J.; Liablin, M.; Lokajicek, M.; Lomakin, Y.; Lupi, A.; Maidanchik, C.; Maio, A.; Makouski, M.; Maliukov, S.; Manousakis, A.; Mapelli, L.; Marques, C.; Marroquim, F.; Martin, F.; Mazzoni, E.; Merritt, F.; Miagkov, A.; Miller, R.; Minashvili, I.; Miralles, L.; Montarou, G.; Mosidze, M.; Myagkov, A.; Nemecek, S.; Nessi, M.; Nodulman, L.; Nordkvist, B.; Norniella, O.; Novakova, J.; Onofre, A.; Oreglia, M.; Pallin, D.; Pantea, D.; Petersen, J.; Pilcher, J.; Pina, J.; Pinhão, J.; Podlyski, F.; Portell, X.; Poveda, J.; Pribyl, L.; Price, L. E.; Proudfoot, J.; Ramstedt, M.; Richards, R.; Roda, C.; Romanov, V.; Rosnet, P.; Roy, P.; Ruiz, A.; Rumiantsev, V.; Russakovich, N.; Saltó, O.; Salvachua, B.; Sanchis, E.; Sanders, H.; Santoni, C.; Saraiva, J. G.; Sarri, F.; Satsunkevitch, I.; Says, L.-P.; Schlager, G.; Schlereth, J.; Seixas, J. M.; Selldèn, B.; Shalanda, N.; Shevtsov, P.; Shochet, M.; Silva, J.; da Silva, P.; Simaitis, V.; Simonyan, M.; Sissakian, A.; Sjölin, J.; Solans, C.; Solodkov, A.; Soloviev, I.; Solovyanov, O.; Sosebee, M.; Spanò, F.; Stanek, R.; Starchenko, E.; Starovoitov, P.; Stavina, P.; Suk, M.; Sykora, I.; Tang, F.; Tas, P.; Teuscher, R.; Tokar, S.; Topilin, N.; Torres, J.; Tremblet, L.; Tsiareshka, P.; Tylmad, M.; Underwood, D.; Unel, G.; Usai, G.; Valero, A.; Valkar, S.; Valls, J. A.; Vartapetian, A.; Vazeille, F.; Vichou, I.; Vinogradov, V.; Vivarelli, I.; Volpi, M.; White, A.; Zaitsev, A.; Zenine, A.; Zenis, T.

2010-04-01

41

Identification and filtering of uncharacteristic noise in the CMS hadron calorimeter  

Microsoft Academic Search

Commissioning studies of the CMS hadron calorimeter have identified sporadic uncharacteristic noise and a small number of malfunctioning calorimeter channels. Algorithms have been developed to identify and address these problems in the data. The methods have been tested on cosmic ray muon data, calorimeter noise data, and single beam data collected with CMS in 2008. The noise rejection algorithms can

S. Chatrchyan; V. Khachatryan; A. M. Sirunyan; W. Adam; B. Arnold; H. Bergauer; T. Bergauer; M. Dragicevic; M. Eichberger; J. Ero; M. Friedl; R. Fruhwirth; V. M. Ghete; J. Hammer; S. Hansel; M. Hoch; N. Hormann; J. Hrubec; M. Jeitler; G. Kasieczka; K. Kastner; M. Krammer; D. Liko; I. M. de Abril; I. Mikulec; F. Mittermayr; B. Neuherz; M. Oberegger; M. Padrta; M. Pernicka; H. Rohringer; S. Schmid; R. Schofbeck; T. Schreiner; R. Stark; H. Steininger; J. Strauss; A. Taurok; F. Teischinger; T. Themel; D. Uhl; P. Wagner; W. Waltenberger; G. Walzel; E. Widl; C. E. Wulz; V. Chekhovsky; O. Dvornikov; I. Emeliantchik; A. Litomin; V. Makarenko; I. Marfin; V. Mossolov; N. Shumeiko; A. Solin; R. Stefanovitch; J. S. Gonzalez; A. Tikhonov; A. Fedorov; A. Karneyeu; M. Korzhik; V. Panov; R. Zuyeuski; P. Kuchinsky; W. Beaumont; L. Benucci; M. Cardaci; E. A. De Wolf; E. Delmeire; D. Druzhkin; M. Hashemi; X. Janssen; T. Maes; L. Mucibello; S. Ochesanu; R. Rougny; M. Selvaggi; H. Van Haevermaet; P. Van Mechelen; N. Van Remortel; V. Adler; S. Beauceron; S. Blyweert; J. DHondt; S. De Weirdt; O. Devroede; J. Heyninck; A. Kalogeropoulos; J. Maes; M. Maes; M. U. Mozer; S. Tavernier; W. Van Doninck; P. Van Mulders; I. Villella; O. Bouhali; E. C. Chabert; O. Charaf; B. Clerbaux; G. De Lentdecker; V. Dero; S. Elgammal; A. P. R. Gay; G. H. Hammad; P. E. Marage; S. Rugovac; C. Vander Velde; P. Vanlaer; J. Wickens; M. Grunewald; B. Klein; A. Marinov; D. Ryckbosch; F. Thyssen; M. Tytgat; L. Vanelderen; P. Verwilligen; S. Basegmez; G. Bruno; J. Caudron; C. Delaere; P. Demin; D. Favart; A. Giammanco; G. Gregoire; V. Lemaitre; O. Militaru; S. Ovyn; K. Piotrzkowski; L. Quertenmont; N. Schul; N. Beliy; E. Daubie; G. A. Alves; M. E. Pol; M. H. G. Souza; W. Carvalho; D. D. Damiao; C. D. Martins; S. F. De Souza; L. Mundim; V. Oguri; A. Santoro; S. M. S. Do Amaral; A. Sznajder; Trfp Tomei; M. A. F. Dias; E. M. Gregores; S. F. Novaes; K. Abadjiev; T. Anguelov; J. Damgov; N. Darmenov; L. Dimitrov; V. Genchev; P. Iaydjiev; S. Piperov; S. Stoykova; G. Sultanov; R. Trayanov; I. Vankov; A. Dimitrov; M. Dyulendarova; V. Kozhuharov; L. Litov; E. Marinova; M. Mateev; B. Pavlov; P. Petkov; Z. Toteva; G. M. Chen; H. S. Chen; W. Guan; C. H. Jiang; D. Liang; B. Liu; X. Meng; J. Tao; J. Wang; Z. Wang; Z. Xue; Z. Zhang; Y. Ban; J. Cai; Y. Ge; S. Guo; Z. Hu; Y. Mao; S. J. Qian; H. Teng; B. Zhu; C. Avila; M. B. Ruiz; C. A. C. Montoya; A. Gomez; B. G. Moreno; A. A. O. Rios; A. F. O. Oliveros; D. R. Romero; J. C. Sanabria; N. Godinovic; K. Lelas; R. Plestina; D. Polic; I. Puljak; Z. Antunovic; M. Dzelalija; V. Brigljevic; S. Duric; K. Kadija; S. Morovic; R. Fereos; M. Galanti; J. Mousa; A. Papadakis; F. Ptochos; P. A. Razis; D. Tsiakkouri; Z. Zinonos; A. Hektor; M. Kadastik; K. Kannike; M. Muntel; M. Raidal; L. Rebane; E. Anttila; S. Czellar; J. Harkonen; A. Heikkinen; V. Karimaki; R. Kinnunen; J. Klem; M. J. Kortelainen; T. Lampen; K. Lassila-Perini; S. Lehti; T. Linden; P. Luukka; T. Maenpaa; J. Nysten; E. Tuominen; J. Tuominiemi; D. Ungaro; L. Wendland; K. Banzuzi; A. Korpela; T. Tuuva; P. Nedelec; D. Sillou; M. Besancon; R. Chipaux; M. Dejardin; D. Denegri; J. Descamps; B. Fabbro; J. L. Faure; F. Ferri; S. Ganjour; F. X. Gentit; A. Givernaud; P. Gras; G. H. de Monchenault; P. Jarry; M. C. Lemaire; E. Locci; J. Malcles; M. Marionneau; L. Millischer; J. Rander; A. Rosowsky; D. Rousseau; M. Titov; P. Verrecchia; S. Baffioni; L. Bianchini; M. Bluj; P. Busson; C. Charlot; L. Dobrzynski; R. G. de Cassagnac; M. Haguenauer; P. Mine; P. Paganini; Y. Sirois; C. Thiebaux; A. Zabi; J. L. Agram; A. Besson; D. Bloch; D. Bodin; J. M. Brom; E. Conte; F. Drouhin; J. C. Fontaine; D. Gele; U. Goerlach; L. Gross; P. Juillot; A. C. Le Bihan; Y. Patois; J. Speck; P. Van Hove; C. Baty; M. Bedjidian; J. Blaha; G. Boudoul; H. Brun; N. Chanon; R. Chierici; D. Contardo; P. Depasse; T. Dupasquier; H. El Mamouni; F. Fassi; J. Fay; S. Gascon; B. Ille; T. Kurca; T. Le Grand; M. Lethuillier; N. Lumb; L. Mirabito; S. Perries; M. Vander Donckt; P. Verdier; N. Djaoshvili; N. Roinishvili; V. Roinishvili; N. Amaglobeli; R. Adolphi; G. Anagnostou; R. Brauer; W. Braunschweig; M. Edelhoff; H. Esser; L. Feld; W. Karpinski; A. Khomich; K. Klein; N. Mohr; A. Ostaptchouk; D. Pandoulas; G. Pierschel; F. Raupach; S. Schael; A. S. von Dratzig; G. Schwering; D. Sprenger; M. Thomas; M. Weber; B. Wittmer; M. Wlochal; O. Actis; G. Altenhofer; W. Bender; P. Biallass; M. Erdmann; G. Fetchenhauer; J. Frangenheim; T. Hebbeker; G. Hilgers; A. Hinzmann; K. Hoepfner; C. Hof; M. Kirsch; T. Klimkovich; P. Kreuzer; D. Lanske; M. Merschmeyer; A. Meyer; B. Philipps; H. Pieta; H. Reithler; S. A. Schmitz; L. Sonnenschein; M. Sowa; J. Steggemann; H. Szczesny; D. Teyssier; C. Zeidler; M. Bontenackels; M. Davids; M. Duda; G. Flugge; H. Geenen; M. Giffels; W. H. Ahmad; T. Hermanns; D. Heydhausen

2010-01-01

42

A Novel Digital Hadron Calorimeter: Analysis and Calibration with Muons  

NASA Astrophysics Data System (ADS)

This thesis is a report on the design, construction and data analysis of the Digital Hadron Calorimeter (DHCAL). The DHCAL was constructed as part of the CALICE collaboration efforts in the SiD detector design for the proposed International Linear Collider (ILC). The SiD detector design is one of two detector designs for the ILC. The DHCAL is but one of the detector sub-systems that are to make up the entire detector. The CALICE collaboration is involved in the development of calorimeters for the ILC. The DHCAL utilizes Resistive Plate Chamber technology to detect the physics events and is the world's first digital imaging calorimeter. The prototype construction was performed at Argonne National Laboratory and the detector studied locally in a cosmic ray test stand. In addition, the DHCAL was also put into multiple test beam runs at Fermi National Accelerator Laboratory. This work will be completed with the analysis of the DHCAL data with muons. The calibration with muons will be discussed, as well as its purpose to the overall viability of this technology in a full scale detector.

Trojand, Daniel

43

Development of a readout link board for the demonstrator of the ATLAS Tile calorimeter upgrade  

NASA Astrophysics Data System (ADS)

A hybrid readout system is being developed for installation in one module of the ATLAS scintillating Tile Calorimeter (TileCal) during the long LHC shutdown in 2013/2014. The hybrid combines a fully functional demonstrator of the full-digital system planned for installation in 2022 with circuitry to maintain compatibility with the existing system. This is the report on a second generation prototype link and controller board connecting the on- and off-detector electronics. The main logic component within this board is a XILINX Kintex-7 FPGA connected to an 12 ×5 Gbps SNAP12 opto transmitter and a 4 ×10 Gbps QSFP+ connector, for off-detector communication. One of the latter two will be chosen for the final design.

Muschter, S.; Anderson, K.; Bohm, C.; Eriksson, D.; Oreglia, M.; Tang, F.

2013-03-01

44

GEANT4 physics evaluation with testbeam data of the ATLAS hadronic end-cap calorimeter  

NASA Astrophysics Data System (ADS)

We evaluate the validity of the GEANT4 electromagnetic and hadronic physics models by comparing experimental data from beam tests of modules of the ATLAS hadronic end-cap calorimeter with GEANT4-based simulations. Two physics lists (LHEP and QGSP) for the simulation of hadronic showers are evaluated. Calorimeter performance parameters like the energy resolution and shapes of showers are studied both for electrons and charged pions. Furthermore, throughout the paper we compare GEANT4 and the corresponding predictions of GEANT3 used with the G-CALOR code for hadronic shower development.

Kiryunin, A. E.; Oberlack, H.; Salihagi?, D.; Schacht, P.; Strizenec, P.

2006-05-01

45

Studies of hadron-electron separators for the ZEUS barrel calorimeter  

SciTech Connect

Two possible upgrades, a shower maximum detector and a presampler, designed to improve the low energy electron/hadron separation capabilities of the ZEUS barrel calorimeter are described and test-beam results are reported. The presampler can also be used to correct for energy loss of particles traversing the dead material in front of the calorimeter.

Ambats, I.; Bortz, D.; Connolly, A. [and others

1995-05-25

46

A study on dual readout crystal calorimeter for hadron and jet energy measurement at a future lepton collider  

SciTech Connect

Studies of requirements and specifications of crystals are necessary to develop a new generation of crystals for dual readout crystal hadron or total absorption calorimeter. This is a short and basic study of the characteristics and hadron energy measurement of PbWO4 and BGO crystals for scintillation and Cerenkov Dual Readout hadron calorimeter.

Yeh, G.P.; /Fermilab

2010-01-01

47

Front end readout electronics for the CMS hadron calorimeter  

SciTech Connect

The front-end electronics for the CMS Hadron Calorimeter provides digitized data at the beam interaction rate of 40 MHz. Analog signals provided by hybrid photodiodes (HPDs) or photomultiplier tubes (PMTs) are digitized and the data is sent off board through serialized fiber optic links running at 1600 Mbps. In order to maximize the input signal, the front-end electronics are housed on the detector in close proximity to the scintillating fibers or phototubes. To fit the electronics into available space, custom crates, backplanes and cooling methods have had to be developed. During the expected ten-year lifetime, the front-end readout electronics will exist in an environment where radiation levels approach 330 rads and the neutron fluence will be 1.3E11 n/cm{sup 2}. For this reason, the design approach relies heavily upon custom radiation tolerant ASICs. This paper will present the system architecture of the front-end readout crates and describe their results with early prototypes.

Terri M. Shaw et al.

2002-11-20

48

Signal equalization and energy resolution for uranium\\/silicon hadron calorimeters  

Microsoft Academic Search

The response of a uranium\\/silicon hadron calorimeter, one of the options suggested for detecting jets at a hadron supercollider, was studied. It is shown that the e\\/h signal ratio of such a detector can be made 1.0 (compensation), by means of thin polyethylene foils sandwiching the Si layers. This guarantees signal linearity for hadron detection, and a Gaussian line shape.

Richard Wigmans

1987-01-01

49

Performance of the CMS hadron calorimeter with cosmic ray muons and LHC beam data  

Microsoft Academic Search

The CMS Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various measurements were also performed during the few days of beam in the LHC in September 2008. Calibration parameters were extracted, and

S. Chatrchyan; V. Khachatryan; A. M. Sirunyan; W. Adam; B. Arnold; H. Bergauer; T. Bergauer; M. Dragicevic; M. Eichberger; J. Ero; M. Friedl; R. Fruhwirth; V. M. Ghete; J. Hammer; S. Hansel; M. Hoch; N. Hormann; J. Hrubec; M. Jeitler; G. Kasieczka; K. Kastner; M. Krammer; D. Liko; I. M. de Abril; I. Mikulec; F. Mittermayr; B. Neuherz; M. Oberegger; M. Padrta; M. Pernicka; H. Rohringer; S. Schmid; R. Schofbeck; T. Schreiner; R. Stark; H. Steininger; J. Strauss; A. Taurok; F. Teischinger; T. Themel; D. Uhl; P. Wagner; W. Waltenberger; G. Walzel; E. Widl; C. E. Wulz; V. Chekhovsky; O. Dvornikov; I. Emeliantchik; A. Litomin; V. Makarenko; I. Marfin; V. Mossolov; N. Shumeiko; A. Solin; R. Stefanovitch; J. S. Gonzalez; A. Tikhonov; A. Fedorov; A. Karneyeu; M. Korzhik; V. Panov; R. Zuyeuski; P. Kuchinsky; W. Beaumont; L. Benucci; M. Cardaci; E. A. De Wolf; E. Delmeire; D. Druzhkin; M. Hashemi; X. Janssen; T. Maes; L. Mucibello; S. Ochesanu; R. Rougny; M. Selvaggi; H. Van Haevermaet; P. Van Mechelen; N. Van Remortel; V. Adler; S. Beauceron; S. Blyweert; J. DHondt; S. De Weirdt; O. Devroede; J. Heyninck; A. Kalogeropoulos; J. Maes; M. Maes; M. U. Mozer; S. Tavernier; W. Van Doninck; P. Van Mulders; I. Villella; O. Bouhali; E. C. Chabert; O. Charaf; B. Clerbaux; G. De Lentdecker; V. Dero; S. Elgammal; A. P. R. Gay; G. H. Hammad; P. E. Marage; S. Rugovac; C. V. Velde; P. Vanlaer; J. Wickens; M. Grunewald; B. Klein; A. Marinov; D. Ryckbosch; F. Thyssen; M. Tytgat; L. Vanelderen; P. Verwilligen; S. Basegmez; G. Bruno; J. Caudron; C. Delaere; P. Demin; D. Favart; A. Giammanco; G. Gregoire; V. Lemaitre; O. Militaru; S. Ovyn; K. Piotrzkowski; L. Quertenmont; N. Schul; N. Beliy; E. Daubie; G. A. Alves; M. E. Pol; M. H. G. Souza; W. Carvalho; D. D. Damiao; C. D. Martins; S. F. De Souza; L. Mundim; V. Oguri; A. Santoro; S. M. S. Do Amaral; A. Sznajder; Trfp Tomei; M. A. F. Dias; E. M. Gregores; S. F. Novaes; K. Abadjiev; T. Anguelov; J. Damgov; N. Darmenov; L. Dimitrov; V. Genchev; P. Iaydjiev; S. Piperov; S. Stoykova; G. Sultanov; R. Trayanov; I. Vankov; A. Dimitrov; M. Dyulendarova; V. Kozhuharov; L. Litov; E. Marinova; M. Mateev; B. Pavlov; P. Petkov; Z. Toteva; G. M. Chen; H. S. Chen; W. Guan; C. H. Jiang; D. Liang; B. Liu; X. Meng; J. Tao; J. Wang; Z. Wang; Z. Xue; Z. Zhang; Y. Ban; J. Cai; Y. Ge; S. Guo; Z. Hu; Y. Mao; S. J. Qian; H. Teng; B. Zhu; C. Avila; M. B. Ruiz; C. A. C. Montoya; A. Gomez; B. G. Moreno; A. A. O. Rios; A. F. O. Oliveros; D. R. Romero; J. C. Sanabria; N. Godinovic; K. Lelas; R. Plestina; D. Polic; I. Puljak; Z. Antunovic; M. Dzelalija; V. Brigljevic; S. Duric; K. Kadija; S. Morovic; R. Fereos; M. Galanti; J. Mousa; A. Papadakis; F. Ptochos; P. A. Razis; D. Tsiakkouri; Z. Zinonos; A. Hektor; M. Kadastik; K. Kannike; M. Muntel; M. Raidal; L. Rebane; E. Anttila; S. Czellar; J. Harkonen; A. Heikkinen; V. Karimaki; R. Kinnunen; J. Klem; M. J. Kortelainen; T. Lampen; K. Lassila-Perini; S. Lehti; T. Linden; P. Luukka; T. Maenpaa; J. Nysten; E. Tuominen; J. Tuominiemi; D. Ungaro; L. Wendland; K. Banzuzi; A. Korpela; T. Tuuva; P. Nedelec; D. Sillou; M. Besancon; R. Chipaux; M. Dejardin; D. Denegri; J. Descamps; B. Fabbro; J. L. Faure; F. Ferri; S. Ganjour; F. X. Gentit; A. Givernaud; P. Gras; G. H. de Monchenault; P. Jarry; M. C. Lemaire; E. Locci; J. Malcles; M. Marionneau; L. Millischer; J. Rander; A. Rosowsky; D. Rousseau; M. Titov; P. Verrecchia; S. Baffioni; L. Bianchini; M. Bluj; P. Busson; C. Charlot; L. Dobrzynski; R. G. de Cassagnac; M. Haguenauer; P. Minc; P. Paganini; Y. Sirois; C. Thiebaux; A. Zabi; J. L. Agram; A. Besson; D. Bloch; D. Bodin; J. M. Brom; E. Conte; F. Drouhin; J. C. Fontaine; D. Gele; U. Goerlach; L. Gross; P. Juillot; A. C. Le Bihan; Y. Patois; J. Speck; P. Van Hove; C. Baty; M. Bedjidian; J. Blaha; G. Boudoul; H. Brun; N. Chanon; R. Chierici; D. Contardo; P. Depasse; T. Dupasquier; H. El Mamouni; F. Fassi; J. Fay; S. Gascon; B. Ille; T. Kurca; T. Le Grand; M. Lethuillier; N. Lumb; L. Mirabito; S. Perries; M. V. Donckt; P. Verdier; N. Djaoshvili; N. Roinishvili; V. Roinishvili; N. Amaglobeli; R. Adolphi; G. Anagnostou; R. Brauer; W. Braunschweig; M. Edelhoff; H. Esser; L. Feld; W. Karpinski; A. Khomich; K. Klein; N. Mohr; A. Ostaptchouk; D. Pandoulas; G. Pierschel; F. Raupach; S. Schael; A. S. von Dratzig; G. Schwering; D. Sprenger; M. Thomas; M. Weber; B. Wittmer; M. Wlochal; O. Actis; G. Altenhofer; W. Bender; P. Biallass; M. Erdmann; G. Fetchenhauer; J. Frangenheim; T. Hebbeker; G. Hilgers; A. Hinzmann; K. Hoepfner; C. Hof; M. Kirsch; T. Klimkovich; P. Kreuzer; D. Lanske; M. Merschmeyer; A. Meyer; B. Philipps; H. Pieta; H. Reithler; S. A. Schmitz; L. Sonnenschein; M. Sowa; J. Steggemann; H. Szczesny; D. Teyssier; C. Zeidler; M. Bontenackels; M. Davids; M. Duda; G. Flugge; H. Geenen; M. Giffels; W. H. Ahmad; T. Hermanns; D. Heydhausen; S. Kalinin

2010-01-01

50

Construction, assembly and testing of the ATLAS hadronic end-cap calorimeter  

NASA Astrophysics Data System (ADS)

The construction and assembly of the four wheels of the ATLAS hadronic end-cap calorimeter and their insertion into the two end-cap cryostats are described. The results of the qualification tests prior to installation of the two cryostats in the ATLAS experimental cavern are reviewed.

Gingrich, D. M.; et al.

2007-05-01

51

Large TileCal magnetic field simulation.  

National Technical Information Service (NTIS)

The ATLAS magnetic field map has been estimated in the presence of the hadron tile calorimeter. This is an important issue in order to quantify the needs for individual PMT shielding, the effect on the scintillator light yield and its implications on the ...

M. Nessi F. Bergsma S. B. Vorozhtsov O. N. Borisov O. V. Lomakina

1994-01-01

52

A method for the separation and reconstructions of charged hadron and neutral hadron from their overlapped showers in an electromagnetic calorimeter  

NASA Astrophysics Data System (ADS)

The separation and reconstructions of charged hadron and neutral hadron from their overlapped showers in an electromagnetic calorimeter is very important for the reconstructions of some particles with hadronic decays, for example the tau reconstruction in the searches for the Standard Model and supersymmetric Higgs bosons at the LHC. In this paper, a method combining the shower cluster in an electromagnetic calorimeter and the parametric formula for hadron showers, was developed to separate the overlapped showers between charged hadron and neutral hadron. Taking the hadronic decay containing one charged pion and one neutral pion in the final status of tau for example, satisfied results of the separation of the overlapped showers, the reconstructions of the energy and positions of the hadrons were obtained. An improved result for the tau reconstruction with this decay model can be also achieved after the application of the proposed method.

Liang, Song; Tao, Jun-Quan; Shen, Yu-Qiao; Fan, Jia-Wei; Xiao, Hong; Chen, Guo-Ming; Chen, He-Sheng; Bian, Jian-Guo; Chen, Ye; Li, Zu-Hao; Meng, Xiang-Wei; Tang, Zhi-Cheng; Wang, Xian-You; Wang, Zheng; Xu, Ming; Xu, Wei-Wei; Yan, Qi; Yang, Min; Zhang, Cheng; Zhu, Shi-Hai

2013-09-01

53

Cold electronics for the liquid argon hadronic end-cap calorimeter of ATLAS  

NASA Astrophysics Data System (ADS)

This paper describes the on-detector electronics of the ATLAS hadronic end-cap calorimeter (HEC). The electronics is operated in liquid argon; therefore attention is paid to its performance at low temperatures. The core of the electronics are Gallium Arsenide (GaAs) preamplifiers. We present design, layout and results of various tests of the preamplifier chips and summing boards. The calibration and signal cables have been studied under laboratory conditions and the signal distortion is modeled. All parts of the electronics have been produced, tested and assembled on the calorimeter modules. The summary of the commissioning tests is presented.

Ban, J.; Brettel, H.; Cwienk, W. D.; Fent, J.; Kurchaninov, L.; Ladygin, E.; Oberlack, H.; Schacht, P.; Stenzel, H.; Strizenec, P.

2006-01-01

54

The SDC central calorimeter  

SciTech Connect

An overview of the calorimeter being designed and constructed by Solenoidal Detector Collaboration (SDC) for use at the Superconducting SuperCollider is presented. The collaboration have chosen to build a sampling calorimeter using scintillating tile with wavelength-shifter fiber readout as the detector medium, and absorber media of lead and iron for the electromagnetic and hadronic compartments. This choice was based on a substantial amount of R&D and Monte Carlo simulation calculations, which showed that it both met the necessary experimental specifications in addition to being a cost effect design.

Proudfoot, J.; The SDC Collaboration

1992-11-01

55

The SDC central calorimeter  

SciTech Connect

An overview of the calorimeter being designed and constructed by Solenoidal Detector Collaboration (SDC) for use at the Superconducting SuperCollider is presented. The collaboration have chosen to build a sampling calorimeter using scintillating tile with wavelength-shifter fiber readout as the detector medium, and absorber media of lead and iron for the electromagnetic and hadronic compartments. This choice was based on a substantial amount of R D and Monte Carlo simulation calculations, which showed that it both met the necessary experimental specifications in addition to being a cost effect design.

Proudfoot, J.

1992-01-01

56

Calorimeter based detectors for high energy hadron colliders  

SciTech Connect

The work was directed in two complementary directions, the D0 experiment at Fermilab, and the GEM detector for the SSC. Efforts have been towards the data taking and analysis with the newly commissioned D0 detector at Fermilab in the [bar p]p Collider run that started in May 1992 and ended on June 1, 1993. We involved running and calibration of the calorimeter and tracking chambers, the second level trigger development, and various parts of the data analysis, as well as studies for the D0 upgrade planned in the second half of this decade. Another major accomplishment was the delivery'' of the Technical Design Report for the GEM SSC detector. Efforts to the overall detector and magnet design, design of the facilities, installation studies, muon system coordination, muon chamber design and tests, muon system simulation studies, and physics simulation studies. In this document we describe these activities separately.

Not Available

1993-06-23

57

Single hadron response measurement and calorimeter jet energy scale uncertainty with the ATLAS detector at the LHC  

NASA Astrophysics Data System (ADS)

The uncertainty on the calorimeter energy response to jets of particles is derived for the ATLAS experiment at the Large Hadron Collider (LHC). First, the calorimeter response to single isolated charged hadrons is measured and compared to the Monte Carlo simulation using proton-proton collisions at centre-of-mass energies of sqrt{s} = 900 {GeV} and 7 TeV collected during 2009 and 2010. Then, using the decay of K s and ? particles, the calorimeter response to specific types of particles (positively and negatively charged pions, protons, and anti-protons) is measured and compared to the Monte Carlo predictions. Finally, the jet energy scale uncertainty is determined by propagating the response uncertainty for single charged and neutral particles to jets. The response uncertainty is 2-5 % for central isolated hadrons and 1-3 % for the final calorimeter jet energy scale.

Aad, G.; Abbott, B.; Abdallah, J.; Abdelalim, A. A.; Abdesselam, A.; Abdinov, O.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acerbi, E.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Aderholz, M.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Akiyama, A.; Alam, M. S.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Aliyev, M.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amaral, P.; Amelung, C.; Ammosov, V. V.; Amorim, A.; Amorós, G.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Andrieux, M.-L.; Anduaga, X. S.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Asfandiyarov, R.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Astvatsatourov, A.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Ay, C.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barashkou, A.; Barbaro Galtieri, A.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Barrillon, P.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Begel, M.; Behar Harpaz, S.; Behera, P. K.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellina, F.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Ben Ami, S.; Benary, O.; Benchekroun, D.; Benchouk, C.; Bendel, M.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertinelli, F.; Bertolucci, F.; Besana, M. I.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bitenc, U.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. B.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bona, M.; Bondarenko, V. G.; Bondioli, M.; Boonekamp, M.; Booth, C. N.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Botterill, D.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozhko, N. I.; Bozovic-Jelisavcic, I.; Bracinik, J.; Braem, A.; Branchini, P.; Brandenburg, G. W.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brelier, B.; Bremer, J.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Brodbeck, T. J.; Brodet, E.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.; Bruni, G.

2013-03-01

58

The local hardening effect on electromagnetic showers. A way for signal equalization in Si\\/high-Z hadron calorimeters  

Microsoft Academic Search

The condition for obtaining the linear response of a calorimeter to hadronic showers and an energy resolution improving as the incident energy increases is the equalization between the electromagnetic and the hadronic signals. This equalization is obtained within a new approach exploiting a local hardening effect that is realized by inserting low-Z absorbers next to the silicon readout detectors. In

F. Lemeilleur; E. Borchi; I. Fedder; E. Fretwurst; G. Lindstroem; F. Lamarche; C. Leroy; C. Furetta; R. Paludetto; S. Pensotti; P. G. Rancoita; C. Simeone; L. Vismara; A. Seidman; Guido Barbiellini; Aldo L Penzo; P. Giubellino; L. Ramello; L. Riccati

1989-01-01

59

Performance of CMS hadron calorimeter timing and synchronization using test beam, cosmic ray, and LHC beam data  

Microsoft Academic Search

This paper discusses the design and performance of the time measurement technique and of the synchronization systems of the CMS hadron calorimeter. Time measurement performance results are presented from test beam data taken in the years 2004 and 2006. For hadronic showers of energy greater than 100 GeV, the timing resolution is measured to be about 1.2 ns. Time synchronization

S. Chatrchyan; V. Khachatryan; A. M. Sirunyan; W. Adam; B. Arnold; H. Bergauer; T. Bergauer; M. Dragicevic; M. Eichberger; J. Ero; M. Friedl; R. Fruhwirth; V. M. Ghete; J. Hammer; S. Hansel; M. Hoch; N. Hormann; J. Hrubec; M. Jeitler; G. Kasieczka; K. Kastner; M. Krammer; D. Liko; I. M. de Abril; I. Mikulec; F. Mittermayr; B. Neuherz; M. Oberegger; M. Padrta; M. Pernicka; H. Rohringer; S. Schmid; R. Schofbeck; T. Schreiner; R. Stark; H. Steininger; J. Strauss; A. Taurok; F. Teischinger; T. Themel; D. Uhl; P. Wagner; W. Waltenberger; G. Walzel; E. Widl; C. E. Wulz; V. Chekhovsky; O. Dvornikov; I. Emeliantchik; A. Litomin; V. Makarenko; I. Marfin; V. Mossolov; N. Shumeiko; A. Solin; R. Stefanovitch; J. S. Gonzalez; A. Tikhonov; A. Fedorov; A. Karneyeu; M. Korzhik; V. Panov; R. Zuyeuski; P. Kuchinsky; W. Beaumont; L. Benucci; M. Cardaci; E. A. De Wolf; E. Delmeire; D. Druzhkin; M. Hashemi; X. Janssen; T. Maes; L. Mucibello; S. Ochesanu; R. Rougny; M. Selvaggi; H. Van Haevermaet; P. Van Mechelen; N. Van Remortel; V. Adler; S. Beauceron; S. Blyweert; J. DHondt; S. De Weirdt; O. Devroede; J. Heyninck; A. Kalogeropoulos; J. Maes; M. Maes; M. U. Mozer; S. Tavernier; W. Van Doninck; P. Van Mulders; I. Villella; O. Bouhali; E. C. Chabert; O. Charaf; B. Clerbaux; G. De Lentdecker; V. Dero; S. Elgammal; A. P. R. Gay; G. H. Hammad; P. E. Marage; S. Rugovac; C. Vander Velde; P. Vanlaer; J. Wickens; M. Grunewald; B. Klein; A. Marinov; D. Ryckbosch; F. Thyssen; M. Tytgat; L. Vanelderen; P. Verwilligen; S. Basegmez; G. Bruno; J. Caudron; C. Delaere; P. Demin; D. Favart; A. Giammanco; G. Gregoire; V. Lemaitre; O. Militaru; S. Ovyn; K. Piotrzkowski; L. Quertenmont; N. Schul; N. Beliy; E. Daubie; G. A. Alves; M. E. Pol; M. H. G. Souza; W. Carvalho; D. D. Damiao; C. D. Martins; S. F. De Souza; L. Mundim; V. Oguri; A. Santoro; S. M. S. Do Amaral; A. Sznajder; Trfp Tomei; M. A. F. Dias; E. M. Gregores; S. F. Novaes; K. Abadjiev; T. Anguelov; J. Damgov; N. Darmenov; L. Dimitrov; V. Genchev; P. Iaydjiev; S. Piperov; S. Stoykova; G. Sultanov; R. Trayanov; I. Vankov; A. Dimitrov; M. Dyulendarova; V. Kozhuharov; L. Litov; E. Marinova; M. Mateev; B. Pavlov; P. Petkov; Z. Toteva; G. M. Chen; H. S. Chen; W. Guan; C. H. Jiang; D. Liang; B. Liu; X. Meng; J. Tao; J. Wang; Z. Wang; Z. Xue; Z. Zhang; Y. Ban; J. Cai; Y. Ge; S. Guo; Z. Hu; Y. Mao; S. J. Qian; H. Teng; B. Zhu; C. Avila; M. B. Ruiz; C. A. C. Montoya; A. Gomez; B. G. Moreno; A. A. O. Rios; A. F. O. Oliveros; D. R. Romero; J. C. Sanabria; N. Godinovic; K. Lelas; R. Plestina; D. Polic; I. Puljak; Z. Antunovic; M. Dzelalija; V. Brigljevic; S. Duric; K. Kadija; S. Morovic; R. Fereos; M. Galanti; J. Mousa; A. Papadakis; F. Ptochos; P. A. Razis; D. Tsiakkouri; Z. Zinonos; A. Hektor; M. Kadastik; K. Kannike; M. Muntel; M. Raidal; L. Rebane; E. Anttila; S. Czellar; J. Harkonen; A. Heikkinen; V. Karimaki; R. Kinnunen; J. Klem; M. J. Kortelainen; T. Lampen; K. Lassila-Perini; S. Lehti; T. Linden; P. Luukka; T. Maenpaa; J. Nysten; E. Tuominen; J. Tuominiemi; D. Ungaro; L. Wendland; K. Banzuzi; A. Korpela; T. Tuuva; P. Nedelec; D. Sillou; M. Besancon; R. Chipaux; M. Dejardin; D. Denegri; J. Descamps; B. Fabbro; J. L. Faure; F. Ferri; S. Ganjour; F. X. Gentit; A. Givernaud; P. Gras; G. H. de Monchenault; P. Jarry; M. C. Lemaire; E. Locci; J. Malcles; M. Marionneau; L. Millischer; J. Rander; A. Rosowsky; D. Rousseau; M. Titov; P. Verrecchia; S. Baffioni; L. Bianchini; M. Bluj; P. Busson; C. Charlot; L. Dobrzynski; R. G. de Cassagnac; M. Haguenauer; P. Mine; P. Paganini; Y. Sirois; C. Thiebaux; A. Zabi; J. L. Agram; A. Besson; D. Bloch; D. Bodin; J. M. Brom; E. Conte; F. Drouhin; J. C. Fontaine; D. Gele; U. Goerlach; L. Gross; P. Juillot; A. C. Le Bihan; Y. Patois; J. Speck; P. Van Hove; C. Baty; M. Bedjidian; J. Blaha; G. Boudoul; H. Brun; N. Chanon; R. Chierici; D. Contardo; P. Depasse; T. Dupasquier; H. El Mamouni; F. Fassi; J. Fay; S. Gascon; B. Ille; T. Kurca; T. Le Grand; M. Lethuillier; N. Lumb; L. Mirabito; S. Perries; M. Vander Donckt; P. Verdier; N. Djaoshvili; N. Roinishvili; V. Roinishvili; N. Amaglobeli; R. Adolphi; G. Anagnostou; R. Brauer; W. Braunschweig; M. Edelhoff; H. Esser; L. Feld; W. Karpinski; A. Khomich; K. Klein; N. Mohr; A. Ostaptchouk; D. Pandoulas; G. Pierschel; F. Raupach; S. Schael; A. S. von Dratzig; G. Schwering; D. Sprenger; M. Thomas; M. Weber; B. Wittmer; M. Wlochal; O. Actis; G. Altenhofer; W. Bender; P. Biallass; M. Erdmann; G. Fetchenhauer; J. Frangenheim; T. Hebbeker; G. Hilgers; A. Hinzmann; K. Hoepfner; C. Hof; M. Kirsch; T. Klimkovich; P. Kreuzer; D. Lanske; M. Merschmeyer; A. Meyer; B. Philipps; H. Pieta; H. Reithler; S. A. Schmitz; L. Sonnenschein; M. Sowa; J. Steggemann; H. Szczesny; D. Teyssier; C. Zeidler; M. Bontenackels; M. Davids; M. Duda; G. Flugge; H. Geenen; M. Giffels; W. H. Ahmad; T. Hermanns; D. Heydhausen

2010-01-01

60

The longitudinal development of showers induced by high-energy hadrons in an iron-sampling calorimeter  

NASA Astrophysics Data System (ADS)

Occasionally cosmic-ray induced air showers result in single, unaccompanied hadrons at ground level. Such events are investigated with the 300 m2 hadron calorimeter of the KASCADE-Grande experiment. It is an iron sampling calorimeter with a depth of 11 hadronic interaction lengths read out by warm-liquid ionization chambers. The longitudinal shower development is discussed as function of energy up to 30 TeV and the results are compared with simulations using the GEANT/FLUKA code. In addition, results of test measurements at a secondary particle beam of the Super Proton Synchrotron at CERN up to 350 GeV are discussed.

Milke, J.; Antoni, T.; Apel, W. D.; Badea, F.; Bekk, K.; Bercuci, A.; Bertaina, M.; Blümer, H.; Bozdog, H.; Brancus, I. M.; Brüggemann, M.; Buchholz, P.; Büttner, C.; Chiavassa, A.; Daumiller, K.; di Pierro, F.; Doll, P.; Engel, R.; Engler, J.; Feßler, F.; Ghia, P. L.; Gils, H. J.; Glasstetter, R.; Haungs, A.; Heck, D.; Hörandel, J. R.; Kampert, K.-H.; Klages, H. O.; Kolotaev, Y.; Maier, G.; Mathes, H. J.; Mayer, H. J.; Mitrica, B.; Morello, C.; Müller, M.; Navarra, G.; Obenland, R.; Oehlschläger, J.; Ostapchenko, S.; Over, S.; Petcu, M.; Plewnia, S.; Rebel, H.; Risse, A.; Roth, M.; Schieler, H.; Scholz, J.; Stümpert, M.; Thouw, T.; Toma, G.; Trinchero, G. C.; Ulrich, H.; Valchierotti, S.; van Buren, J.; Walkowiak, W.; Weindl, A.; Wochele, J.; Zabierowski, J.; Zagromski, S.; Zimmermann, D.

2006-01-01

61

Effects of radiation on scintillating fiber performance. [SSC hadron calorimeter  

SciTech Connect

Continued rapid improvements in formulations for scintillating fibers require the ability to parameterize and predict effects of radiation on detector performance. Experimental techniques necessary to obtain needed information and calculational procedures used in performing predications for hadron scintillating fiber calorimetry in the Superconducting Supercollider environment are described. The experimental techniques involve control of the testing environment, consideration of dose rate effects, and other factors. These calculations involve the behavior of particle showers in the detector, expected levels of radiation, and parameterization of the radiation effects. A summary of significant work is also presented.

Bauer, M.L.; Cohn, H.; Efremenko, Yu.; Gordeev, A.; Kamyshkov, Yu.; Onopienko, D.; Savin, S.; Shmakov, K.; Tarkovsky, E.; Young, K.G. (Oak Ridge National Lab., TN (United States)); Carey, R.; Rothman, M.; Sulak, L.; Worstell, W. (Boston Univ., MA (United States)); Parr, H. (California Univ., San Diego, La Jolla, CA (United States))

1992-01-01

62

Semi-Digital hadronic calorimeter for future high energy physics experiments  

NASA Astrophysics Data System (ADS)

A new concept of high granularity hadronic calorimeter based on a semi-digital readout for future ILC experiments is presented. The aim of this concept is to provide the HCAL with a tracking capacity in addition to a good energy measurement resolution. The sensitive medium of this HCAL is made of very thin gas detectors. The readout is based on detector-embedded electronic boards equipped with low consumption daisy-chained 64-channel chips. The nice results obtained with a slice test made of small detectors show that the concept is successful and can be used to build a 1m3 semi-digital HCAL prototype.

Laktineh, Imad

2009-04-01

63

Channel control ASIC for the CMS hadron calorimeter front end readout module  

SciTech Connect

The Channel Control ASIC (CCA) is used along with a custom Charge Integrator and Encoder (QIE) ASIC to digitize signals from the hybrid photo diodes (HPDs) and photomultiplier tubes (PMTs) in the CMS hadron calorimeter. The CCA sits between the QIE and the data acquisition system. All digital signals to and from the QIE pass through the CCA chip. One CCA chip interfaces with two QIE channels. The CCA provides individually delayed clocks to each of the QIE chips in addition to various control signals. The QIE sends digitized PMT or HPD signals and time slice information to the CCA, which sends the data to the data acquisition system through an optical link.

Ray Yarema et al.

2002-09-26

64

Development of fiber-to-fiber connectors for scintillating tile\\/fiber calorimeters  

Microsoft Academic Search

We have developed fiber-to-fiber connectors for plastic fibers of 0.83, 0.90, and 1.00 mm in diameter. Such a connector is essential for detectors that use a large number of optical fibers, scintillating or clear. Typical applicators are unscintillating tile\\/fiber calorimetry and scintillating fiber tracking. We describe the design and performance of two types of small 10-fiber connectors which were developed

S. Aota; R. C. Bossert; S. Fukuda; K. Hara; H. Kawamoto; Kim S; K. Kondo; M. Mishina; H. Nakada; H. Sato; Y. Seiya; K. Takikawa

1995-01-01

65

A new portable test bench for the ATLAS Tile Calorimeter front-end electronics  

NASA Astrophysics Data System (ADS)

This paper describes a new portable test bench for the TileCal sub-detector of the ATLAS experiment at CERN. The system is used for the certification and quality checks of the front-end electronics drawers. It is designed to be an easily upgradable version of the current 10-year-old system, able to evaluate the new technologies planned for the upgrade as well as provide new functionality to the present system. It will be used during the long shutdown of the LHC in 2013-14 and during future maintenance periods.

Moreno, P.; Alves, J.; Calvet, D.; Carrió, F.; Crouau, M.; Yeun, K. Hee; Minashvili, I.; Nemecek, S.; Qin, G.; Schettino, V.; Solans, C.; Usai, G.; Valero, A.

2013-02-01

66

Radial Distributions of Shower Energy Deposition in Hadron and Photon Hodoscopic Sandwich-Type Calorimeters with Cell Structure.  

National Technical Information Service (NTIS)

The average energy deposition behaviour for the showers in the cell-structure scintillation hadron and photon calorimeter depending on the distance between the centres of cells and coordinates of the point where a 3 GeV particle initiated the shower has b...

I. S. Bajshev N. V. Mokhov V. K. Semenov

1985-01-01

67

Sampling nonuniformity in the SDC calorimeter EM/HAD boundary  

SciTech Connect

The SDC steel hadronic (HAD) calorimeter absorber structure has been designed to be of low magnetic reluctance, high rigidity, and excellent hermiticity. Transverse scintillator tiles staggered longitudinally allow one to assemble the hadronic calorimeter compartment with no transverse dead areas between tiles. Clearly, the structure affords many advantages, among them hermeticity. The only problem is that, at the boundary of the structure, as at the E boundary, the steel sampling fraction for adjacent transverse towers is different. In principle then, the adjacent towers will have different energy calibrations, and different energy resolutions. The aim of this note is to examine the size of these effects and, ff necessary, explore ways to minimize their impact.

Green, D.

1993-04-01

68

SPIROC (SiPM Integrated Read-Out Chip): dedicated very front-end electronics for an ILC prototype hadronic calorimeter with SiPM read-out  

Microsoft Academic Search

The SPIROC chip is a dedicated very front-end electronics for an ILC (International Linear Collider) prototype of hadronic calorimeter using Silicon photomultiplier (SiPM) or Multi-Pixel Photon Counters (MPPC) readout. This ASIC is due to equip a 10,000-channel demonstrator in 2010. SPIROC is an evolution of FLC-SiPM used for the ILC Analogue HCAL physics prototype. The first prototype of SPIROC was

M. Bouchel; S. Callier; F. Dulucq; J. Fleury; J.-J. Jaeger; C. de La Taille; G. Martin-Chassard; L. Raux

2011-01-01

69

SPIROC (SiPM Integrated Read-Out Chip): Dedicated very front-end electronics for an ILC prototype hadronic calorimeter with SiPM read-out  

Microsoft Academic Search

The SPIROC chip is a dedicated very front-end electronics for an ILC prototype hadronic calorimeter with Silicon photomultiplier (or MPPC) readout. This ASIC is due to equip a 10,000-channel demonstrator in 2009. SPIROC is an evolution of FLC_SiPM used for the ILC AHCAL physics prototype [1]. SPIROC was submitted in June 2007 and will be tested in September 2007. It

Michel Bouchel; Frédéric Dulucq; Julien Fleury; C. de La Taille; G. Martin-Chassard; L. Raux

2007-01-01

70

The ATLAS Liquid Argon Calorimeter: Construction, Integration, Commissioning  

Microsoft Academic Search

The ATLAS liquid argon (LAr) calorimeter system consists of an electromagnetic barrel calorimeter and two end caps with electromagnetic, hadronic and forward calorimeters. The liquid argon sampling technique, with an accordion geometry was chosen for the barrel electromagnetic calorimeter (EMB) and adapted to the end cap (EMEC). The hadronic end cap calorimeter (HEC) uses a copper-liquid argon sampling technique with

Martin Aleksa

2006-01-01

71

CMS hadron calorimeter front-end upgrade for SLHC phase I  

SciTech Connect

We present an upgrade plan for the CMS HCAL detector. The HCAL upgrade is required for the increased luminosity (3 * 10E34) of SLHC Phase I which is targeted for 2014. A key aspect of the HCAL upgrade is to add longitudinal segmentation to improve background rejection, energy resolution, and electron isolation at the L1 trigger. The increased segmentation is achieved by replacing the hybrid photodiodes (HPDs) with silicon PMTs (SIPMs). We plan to instrument each fiber of the calorimeter with an SIPM (103,000 total). We will then electrically sum outputs from selected SIPMs to form the longitudinal readout segments. In addition to having more longitudinal information, the upgrade plans include a new custom ADC with matched sensitivity and timing information. The increased data volume requires higher speed transmitters and the additional power dissipation for the readout electronics requires better thermal design, since much of the on-detector infrastructure (front-end electronics crates, cooling pipes, optical fiber plant, etc.) will remain the same. We will report on the preliminary designs for these upgraded systems, along with performance requirements and initial design studies.

Whitmore, Juliana; /Fermilab

2009-09-01

72

(Calorimeter based detectors for high energy hadron colliders). [State Univ. of New York  

SciTech Connect

This document provides a progress report on research that has been conducted under DOE Grant DEFG0292ER40697 for the past year, and describes proposed work for the second year of this 8 year grant starting November 15, 1992. Personnel supported by the contract include 4 faculty, 1 research faculty, 4 postdocs, and 9 graduate students. The work under this grant has in the past been directed in two complementary directions -- DO at Fermilab, and the second SSC detector GEM. A major effort has been towards the construction and commissioning of the new Fermilab Collider detector DO, including design, construction, testing, the commissioning of the central tracking and the central calorimeters. The first DO run is now underway, with data taking and analysis of the first events. Trigger algorithms, data acquisition, calibration of tracking and calorimetry, data scanning and analysis, and planning for future upgrades of the DO detector with the advent of the FNAL Main Injector are all involved. The other effort supported by this grant has been towards the design of GEM, a large and general-purpose SSC detector with special emphasis on accurate muon measurement over a large solid angle. This effort will culminate this year in the presentation to the SSC laboratory of the GEM Technical Design Report. Contributions are being made to the detector design, coordination, and physics simulation studies with special emphasis on muon final states. Collaboration with the RD5 group at CERN to study muon punch through and to test cathode strip chamber prototypes was begun.

Not Available

1992-08-04

73

Design of a new switching power supply for the ATLAS TileCAL front-end electronics  

NASA Astrophysics Data System (ADS)

We present the design of an upgraded switching power supply for the front-end electronics of the ATLAS hadron tile calorimeter (TileCAL) at the LHC. The new design features significant improvement in noise, improved fault detection, and improved reliability, while retaining the compact size, water-cooling, output control, and monitoring features. We discuss the steps taken to improve the design. We present the results from extensive radiation testing to qualify the design, including sensitivity to Single Event Upset. We also present our reliability analysis. Production of 2400 new bricks for the detector is currently in progress, and we present preliminary results from the production checkout.

Drake, G.

2013-02-01

74

Validation of the Hadronic Calibration of the Atlas Calorimeter with Testbeam Data Corresponding to the Pseudorapidity Range 2.5 < |?| < 4.0  

NASA Astrophysics Data System (ADS)

The pseudorapidity region 2.5 < |?| < 4.0 in ATLAS is a particularly complex transition zone between the endcap and forward calorimeters. A set-up consisting of 1/4 resp. 1/8 of the full azimuthal acceptance of the ATLAS liquid argon endcap and forward calorimeters has been exposed to beams of electrons, pions and muons in the energy range E < 200GeV at the CERN SPS. Data have been taken in the endcap and forward calorimeter regions as well as in the transition region. This beam test set-up corresponds very closely to the geometry and support structures in ATLAS. Pion data have been analyzed using the standard local hadronic calibration scheme as forseen for the ATLAS calorimeter. In particular the weighting scheme to compensate for the different electron to pion response as well as corrections for dead material in the transition region have been extensively tested and compared to simulations based on GEANT 4 models.

Pospelov, Guennadi

2010-04-01

75

A Monte Carlo simulation of the response of a hadronic calorimeter to protons of momentum 3.5 to 200 GeV/c  

NASA Astrophysics Data System (ADS)

The response of scintillation counters in an ionization calorimeter to incident protons of momenta 3.5 to 200 GeV/c was simulated using the CALOR computer code system. Results of the simulation are compared with data taken at Brookhaven National Laboratory for 3.5- and 10-GeV/c protons and at Fermi National Accelerator Laboratory for 50-, 100- and 278-GeV hadrons. Mechanisms which produce large pulse heights for low-energy incident particles are discussed.

Mincer, A. I.; Gabriel, T. A.; Bishop, B. L.; Berley, D.; Ellsworth, R. W.; Freudenreich, H. T.; Goodman, J. A.; Tonwar, S. C.; Yodh, G. B.

1985-08-01

76

Study of energy response and resolution of the ATLAS barrel calorimeter to hadrons of energies from 20 to 350 GeV  

NASA Astrophysics Data System (ADS)

A fully instrumented slice of the ATLAS detector was exposed to test beams from the SPS (Super Proton Synchrotron) at CERN in 2004. In this paper, the results of the measurements of the response of the barrel calorimeter to hadrons with energies in the range 20-350 GeV and beam impact points and angles corresponding to pseudo-rapidity values in the range 0.2-0.65 are reported. The results are compared to the predictions of a simulation program using the Geant 4 toolkit.

Atlas Secretariat; Abat, E.; Abdallah, J. M.; Addy, T. N.; Adragna, P.; Aharrouche, M.; Ahmad, A.; Akesson, T. P. A.; Aleksa, M.; Alexa, C.; Anderson, K.; Anghinolfi, F.; Antonaki, A.; Arabidze, G.; Arik, E.; Baker, O. K.; Banfi, D.; Baron, S.; Beck, H. P.; Belhorma, B.; Benchekroun, D.; Benjamin, D. P.; Benslama, K.; Bergeaas Kuutmann, E.; Bertelsen, H.; Binet, S.; Biscarat, C.; Boldea, V.; Bondarenko, V. G.; Boonekamp, M.; Bosman, M.; Bourdarios, C.; Burckhart Chromek, D.; Bychkov, V.; Callahan, J.; Calvet, D.; Canneri, M.; Capeáns Garrido, M.; Caprini, M.; Cardiel Sas, L.; Carli, T.; Carminati, L.; Carvalho, J.; Cascella, M.; Castillo, M. V.; Catinaccio, A.; Cavalli Sforza, M.; Cavalli, D.; Cavasinni, V.; Cetin, S. A.; Chen, H.; Cherkaoui, R.; Chevallier, F.; Ciobotaru, M.; Citterio, M.; Cleland, B.; Cogneras, E.; Conde Muino, P.; Consonni, M.; Constantinescu, S.; Cornelissen, T.; Corso Radu, A.; Costa, G.; Cwetanski, P.; da Silva, D.; Dam, M.; Danielsson, H. O.; Dannheim, D.; Davidek, T.; de, K.; Defay, P. O.; Dekhissi, B.; Del Peso, J.; Delmastro, M.; Del Prete, T.; Derue, F.; di Ciaccio, L.; di Girolamo, B.; Dita, S.; Dittus, F.; Djama, F.; Djobava, T.; Dobson, M.; Dolgoshein, B. A.; Dotti, A.; Drake, G.; Dressnandt, N.; Driouchi, C.; Ebenstein, W. L.; Eerola, P.; Efthymiopoulos, I.; Egorov, K.; Eifert, T. F.; El Kacimi, M.; Etienvre, A. I.; Fabich, A.; Fakhr-Edine, A. I.; Fanti, M.; Farbin, A.; Farthouat, P.; Fassouliotis, D.; Fayard, L.; Febbraro, R.; Fedin, O. L.; Fenyuk, A.; Ferrari, R.; Ferreira, B. C.; Ferrer, A.; Filippini, G.; Fournier, D.; Francavilla, P.; Francis, D.; Froeschl, R.; Froidevaux, D.; Fullana, E.; Gadomski, S.; Gagnon, P.; Gameiro, S.; Garcia, R.; Ghodbane, N.; Giakoumopoulou, V.; Giangiobbe, V.; Giokaris, N.; Glonti, G.; Gollub, N.; Gomes, A.; Gomez, M. D.; González, V.; Gorini, B.; Goujdami, D.; Grahn, K. J.; Grenier, P.; Grigalashvili, N.; Grishkevich, Y.; Gruwe, M.; Guicheney, C.; Gupta, A.; Haeberli, C.; Hajduk, Z.; Hakobyan, H.; Hance, M.; Hansen, P. H.; Harvey, A.; Henriques Correia, A.; Hervas, L.; Higon, E.; Hoffman, J.; Hostachy, J. Y.; Hruska, I.; Hubaut, F.; Hulsbergen, W.; Hurwitz, M.; Iconomidou-Fayard, L.; Jen-La Plante, I.; Johansson, P. D. C.; Jon-And, K.; Joos, M.; Jorgensen, S.; Kaczmarska, A.; Kado, M.; Karyukhin, A.; Kataoka, M.; Kayumov, F.; Kazarov, A.; Keener, P. T.; Kekelidze, G. D.; Kerschen, N.; Khoriauli, G.; Khramov, E.; Khristachev, A.; Khubua, J.; Kittelmann, T. H.; Klinkby, E.; Koffas, T.; Kolos, S.; Konovalov, S. P.; Kopikov, S.; Korolkov, I.; Kovalenko, S.; Kowalski, T. Z.; Krüger, K.; Kramarenko, V.; Kudin, L. G.; Kulchitsky, Y.; Lafaye, R.; Laforge, B.; Lampl, W.; Lanni, F.; Laplace, S.; Le Bihan, A. C.; Lechowski, M.; Ledroit-Guillon, F.; Lehmann, G.; Leitner, R.; Lelas, D.; Liang, Z.; Liang, Z.; Lichard, P.; Lokajicek, M.; Louchard, L.; Loureiro, K.; Lucotte, A.; Luehring, F.; Lundberg, B.; Lund-Jensen, B.; Ma, H.; Mackeprang, R.; Maio, A.; Maleev, V. P.; Malek, F.; Maneira, J.; Mandelli, L.; Mazzanti, M.; Manousakis, A.; Mapelli, L.; Marques, C.; Martin, F.; Mazzanti, M.; McFarlane, K. W.; McHedlidze, G.; McPherson, R.; Meirosu, C.; Meng, Z.; Miagkov, A.; Mialkovski, V.; Milstead, D.; Minashvili, I.; Mindur, B.; Mitsou, V. A.; Monnier, E.; Morozov, S. V.; Mosidze, M.; Mouraviev, S. V.; Munar, A.; Nadtochi, A. V.; Negri, A.; Nemecek, S.; Nessi, M.; Nesterov, S. Y.; Newcomer, F. M.; Nikitine, I.; Nikolic-Audit, I.; Ogren, H.; Oh, S. H.; Oleshko, S. B.; Olszowska, J.; Onofre, A.; Padilla Aranda, C.; Paganis, S.; Pallin, D.; Pantea, D.; Paolone, V.; Parsons, J.; Pasqualucci, E.; Passmore, M. S.; Patrichev, S.; Peez, M.; Perez Reale, V.; Perini, L.; Peshekhonov, V. D.; Petersen, J.; Petersen, T. C.; Petti, R.; Pilcher, J.; Pina, J.; Pinto, B.; Podlyski, F.; Poggioli, L.; Poveda, J.; Pralavorio, P.; Pribyl, L.; Price, M. J.; Prieur, D.; Puigdengoles, C.; Puzo, P.; Rajagopalan, S.; Rembser, C.; Ridel, M.; Riu, I.; Roda, C.; Rohne, O.; Romaniouk, A.; Rousseau, D.; Ruiz, A.; Rusakovich, N.; Rust, D.; Ryabov, Y. F.; Ryjov, V.; Salto, O.; Salvachua, B.; Sanchis, E.; Santamarina Rios, C.; Santoni, C.; Saraiva, J. G.; Sarri, F.; Sauvage, G.; Says, L. P.; Schaefer, M.; Schegelsky, V. A.; Schlager, G.; Schlereth, J.; Schmitt, C.; Schwemling, P.; Schwindling, J.; Seixas, J. M.; Seliverstov, D. M.; Serin, L.; Shalanda, N.; Shin, T.; Shmeleva, A.; Silva, J.; Simion, S.; Simonyan, M.; Sloper, J. E.; Smirnov, S. Yu.; Smirnova, L.; Solans, C.; Solodkov, A.; Solovianov, O.; Soloviev, I.; Sosnovtsev, V. V.; Spanò, F.; Speckmeyer, P.; Stancu, S.; Stanek, R.; Starchenko, E.; Straessner, A.; Suchkov, S. I.; Suk, M.; Szczygiel, R. R.; Tarrade, F.; Tartarelli, F.; Tas, P.; Tayalati, Y.; Teuscher, R.; Thioye, M.; Tikhomirov, V. O.

2010-09-01

77

UA1 Calorimeter Trigger.  

National Technical Information Service (NTIS)

This report describes the design, construction and performance of the fast calorimeter trigger used in the UAL experiment on the CERN p(p bar) collider. Calorimeter energy signals are digitized rapidly and used to trigger on possible electrons, hadronic j...

A. Astbury T. Bowcock M. Cawthraw E. Eisenhandler N. Ellis

1984-01-01

78

Intercalibration Analysis in the Calorimeter/ITC from the Atlas Detector Using Cosmic Ray Data  

NASA Astrophysics Data System (ADS)

The Large Hadron Collider is the largest most ambitious experiment in high energy physics history. It involves the greatest number of scientists from around the world. The first collisions will start being produced in late 2009 and we expect that the information collected will help us understand the physics behind the standard model such as higgs physics and the supersymmetric theories. The high energy physics group in UTA is actively involved with the design, construction and commissioning process of the ATLAS Tile Calorimeter. This work presents an analysis on the inter-calibration of the ITC (intermediate tile calorimeter) cell response to cosmic rays detection. Based on the cosmic data recently taken in the ATLAS detector, while waiting for real collisions, we are able to compare values of energy deposition in individual cells to guarantee the homogeneous performance of the ITC.

Medina, Carlos

2009-10-01

79

Light yield from a scintillator tile with embedded readout fibers  

SciTech Connect

We have studied the light yield in two straight fibers embedded in a square scintillator tile by means of computer simulation. The tile and fiber dimensions are taken in the ballpark of interest for the SDC main calorimeter. A fairly flat total response across the tile can be obtained. Important parameters to be controlled are identified.

Trost, H.J. [Argonne National Lab., IL (United States); Tonnison, J.I.; Barnes, V.E. [Purdue Univ., Lafayette, IN (United States). Dept. of Physics

1991-07-15

80

The ATLAS liquid argon calorimeter : test beam, installation and commissioning  

Microsoft Academic Search

The ATLAS liquid argon (LAr) calorimeter system consists of an electromagnetic barrel calorimeter and two endcaps with electromagnetic, hadronic and forward calorimeters. The construction of the full calorimeter system is completed since mid-2004. Since then, the calorimeters have been installed in the ATLAS cavern. The electronics read-out system is being installed and tested for both the barrel and endcaps. Since

David Rousseau

2007-01-01

81

Response and Uniformity Studies of Directly Coupled Tiles  

SciTech Connect

A finely-segmented scintillator-based calorimeter which capitalizes on the marriage of proven detection techniques with novel solid-state photo-detector devices such as Multi-pixel Photon Counters (MPPCs) is an interesting calorimetric system from the point of view of future detector design. A calorimeter system consisting of millions of channels will require a high degree of integration. The first steps towards this integration have already been facilitated by the small size and magnetic field immunity of the MPPCs. The photo-conversion occurs right at the tile, thus obviating the need for routing of long clear fibers. Similar considerations apply to the presence of wave-length shifting (WLS) fibers inside the tiles which couple it to the photo-detectors. Significant simplification in construction and assembly ensue if the MPPCs can be coupled directly to the scintillator tiles. Equally importantly, the total absence of fibers would offer greater flexibility in the choice of the transverse segmentation while enhancing the electro-mechanical integrability of the design. The NIU high-energy physics group has been studying the fiberless or direct-coupling option for some time now. Encouraging results on response and response uniformity have been obtained using radioactive sources. This MOU seeks to set up a framework to extend these tests using beams at the MTBF. The results will be relevant to high granularity scintillator/crystal electromagnetic and hadronic calorimetry. The tests involve a set of small directly-coupled tile counters fabricated at NIU which will be placed in the beam to study their response and response uniformity as a function of the incident position of the particles passing through them.

Zutshi, Vishnu

2010-04-02

82

The ATLAS Liquid Argon Calorimeter: Construction, Integration, Commissioning  

Microsoft Academic Search

The ATLAS liquid argon (LAr) calorimeter system consists of an electromagnetic barrel calorimeter and two end-caps with electromagnetic, hadronic and forward calorimeters. The liquid argon sampling technique, with an accordion geometry, was chosen for the barrel electromagnetic calorimeter (EMB) and adapted to the end-cap (EMEQ geometry. The hadronic end-cap calorimeter (HEC) relies on a copper-liquid argon sampling technique with flat

B. Laforge

2006-01-01

83

Test of 2000 phototubes for the CDF endplug calorimeter upgrade  

NASA Astrophysics Data System (ADS)

Over 2000 photomultiplier tubes have been selected as the readout device of the upgrade CDF Endplug calorimeter, a scintillator tile sampling calorimeter with wave-shifter fiber readout. The specifications were set on various properties of the tubes for the electromagnetic and hadronic compartments and a series of rigorous tests were made on 2216 Hamamatsu R4125, 10-stage 19mm diameter tubes with green-extended bialkali photocathode. On all of the test items, the distributions of the data were well clustered with minor tails, and the original specifications based on a small ensemble were well suited for rejecting the tails of the distributions. After rejecting 5.4% of the total, 960 tubes for electromagnetic and 864 tubes for hadronic compartments were allocated to projective towers based on their linear dynamic ranges. Tubes with greater linear ranges were assigned to larger pseudo-rapidity channels where greater single-tower energy deposits were expected. This paper describes how we selected the phototubes for our calorimeter and presents the results of the study we made.

Breccia, L.; Delchamps, S. W.; Fiori, I.; Farinelli, G.; Freeman, J.; Jaffrey, T.; Kinney, W.; Koska, W.; Limon, P.; Mishina, M.; Pauletta, G.; Strait, J.; Zucchelli, S.

2004-10-01

84

CMS quartz fiber calorimeter  

NASA Astrophysics Data System (ADS)

The CMS will be a general purpose detector for the Large Hadron Collider at CERN. Its quartz fiber calorimeter is designed to provide hermetic measurement of energy flow in the forward rapidity region. The calorimeter must operate under extremely hard radiation conditions and almost without maintenance. Several prototypes have been constructed and tested at the CERN high-energy beam. The cost effective technology of manufacturing of fine sampling absorber modules has been developed.

Gavrilov, V.

2000-10-01

85

SLD liquid argon calorimeter  

SciTech Connect

The liquid argon calorimeter (LAC) of the SLD detector is a parallel plate -- liquid argon sampling calorimeter, used to measure particle energies in Z[sup 0] decays at the Stanford Linear Collider. The LAC module design is based on a unique projective tower structure, in which lead plates and segmented lead tiles serve both as absorbers and electrodes. The LAC front end electronics incorporates several novel features, including extensive multiplexing and optical fiber readout, which take advantage of the low SLC beam crossing frequency. The operational performance of the LAC during the recently completed SLD physics run (which recorded over 10,000 Z[sup 0] events) is discussed.

Vella, E.

1992-10-01

86

SLD liquid argon calorimeter  

SciTech Connect

The liquid argon calorimeter (LAC) of the SLD detector is a parallel plate -- liquid argon sampling calorimeter, used to measure particle energies in Z{sup 0} decays at the Stanford Linear Collider. The LAC module design is based on a unique projective tower structure, in which lead plates and segmented lead tiles serve both as absorbers and electrodes. The LAC front end electronics incorporates several novel features, including extensive multiplexing and optical fiber readout, which take advantage of the low SLC beam crossing frequency. The operational performance of the LAC during the recently completed SLD physics run (which recorded over 10,000 Z{sup 0} events) is discussed.

Vella, E.; SLD Collaboration

1992-10-01

87

SPIROC: design and performances of a dedicated very front-end electronics for an ILC Analog Hadronic CALorimeter (AHCAL) prototype with SiPM read-out  

NASA Astrophysics Data System (ADS)

For the future e+ e- International Linear Collider (ILC) the ASIC SPIROC (Silicon Photomultiplier Integrated Read-Out Chip) was designed to read out the Analog Hadronic Calorimeter (AHCAL) equipped with Silicon Photomultiplier (SiPM). It is an evolution of the FLC_SiPM chip designed by the OMEGA group in 2005. SPIROC2 [1] was realized in AMS SiGe 0.35 ?m technology [2] and developed to match the requirements of large dynamic range, low noise, low consumption, high precision and large number of read-out channels. This ASIC is a very front-end read-out chip that integrates 36 self triggered channels with variable gain to achieve charge and time measurements. The charge measurement must be performed from 1 up to 2000 photo-electrons (p.e.) corresponding to 160 fC up to 320 pC for SiPM gain 106. The time measurement is performed with a coarse 12-bit counter related to the bunch crossing clock (up to 5 MHz) and a fine time ramp based on this clock (down to 200 ns) to achieve a resolution of 1 ns. An analog memory array with a depth of 16 for each channel is used to store the time information and the charge measurement. The analog memory content (time and charge) is digitized thanks to an internal 12-bit Wilkinson ADC. The data is then stored in a 4kbytes RAM. A complex digital part is necessary to manage all these features and to transfer the data to the DAQ. SPIROC2 is the second generation of the SPIROC ASIC family designed in 2008 by the OMEGA group. A very similar version (SPIROC2c) was submitted in February 2012 to improve the noise performance and also to integrate a new TDC (Time to Digital Converter) structure. This paper describes SPIROC2 and SPIROC2c ASICs and illustrates the main characteristics thank to a series of measurements.

Conforti Di Lorenzo, S.; Callier, S.; Fleury, J.; Dulucq, F.; De la Taille, C.; Chassard, G. Martin; Raux, L.; Seguin-Moreau, N.

2013-01-01

88

Physics with calorimeters  

NASA Astrophysics Data System (ADS)

Calorimeters played an essential role in the discoveries of new physics, for example neutral currents (Gargamelle), quark and gluon jets (SPEAR, UA2, UA1 and PETRA), W and Z bosons (UA1, UA2), top quark (CDF, D0) and neutrino oscillations (SUPER-KAMIOKANDE, SNO). A large variety of different calorimeters have been developed covering an energy range between several and 1020 eV. This article tries to demonstrate on a few selected examples, such as the early jet searches in hadron-hadron collisions, direct dark matter searches, neutrino-less double beta decay and direct neutrino mass measurements, how the development of these devices has allowed to explore new frontiers in physics.

Pretzl, Klaus

2009-04-01

89

Experimental Study of Uranium Plastic Scintillator Calorimeters,  

National Technical Information Service (NTIS)

As preparation for the ZEUS high resolution calorimeter, sampling calorimeters made from 3.2 mm plates of depleted uranium read out by plastic scintillator of 3 mm and 5 mm thickness have been built. The response of hadrons, electrons and muons has been m...

G. d'Agostini A. Bamberger F. Barreiro E. Bernardi K. Dierks

1988-01-01

90

Scintillating fiber calorimeters with cast absorbers  

Microsoft Academic Search

The technology to construct cast lead-eutectic scintillating fiber calorimeters for measuring the energy of hadron and electromagnetic showers is discussed. The lead eutectic injection process, mold construction and release equipment, and fiber preform are described, along with beam test results on prototypes. Novel extensions of the technique include liquid fiber forward calorimeters, and shot-loading of the molten eutectic to achieve

D. Brown; R. Carey; S. T. Dye; E. Hazen; D. Higby; J. P. Miller; B. L. Roberts; L. Sulak; C. Wang; W. Worstell; D. Boccuzzi; D. Scrofani; K. Segall; D. Wall; D. R. Winn; C. Bromberg; J. Huston; R. Miller; C. Yosef; A. David; N. Diaczenko; S. Zaman; A. Sanzgiri; R. Webb; D. Acosta; J. Branson; B. Ong; H. Paar; M. Sivertz; D. Thomas; F. Ayer; C. Elder; D. Sullivan

1991-01-01

91

Procedure for stacking Tile-Cal submodules using the Argonne designed stacking fixture  

SciTech Connect

The purpose of this fixture is to provide a general purpose tool that is simple to construct, simple to use, and flexible enough to adapt to different Tile-Cal Hadron Calorimeter submodule heights and configurations. It is also adaptable for modules that are shorter in radius, if two different lengths are necessary to accommodate the support of the liquid argon cryostat. With minor changes, this fixture can also be used to stack the proposed modules for the ``Crack Filler``. It is expected that minor modifications may be necessary to adapt this fixture to different facilities and working conditions. It is not presumed that this procedure will be satisfactory for every institution that will use it, and suggestions for changes to this procedure will be accepted as constructive and useful information.

Hill, N.F. [Argonne National Lab., IL (United States). High Energy Physics Div.

1995-07-21

92

Electromagnetic calorimeters of the CMD-3 detector  

NASA Astrophysics Data System (ADS)

Recently the CMD-3 detector has started to record the experimental information produced at the VEPP-2000 e+e- collider at BINP (Novosibirsk). CMD-3 is a general purpose detector for a study of e+e- annihilation to hadrons in the wide center-of-mass energy range, The calorimetry in the detector is based on three subsystems: closest to the beam pipe barrel liquid xenon calorimeter, outer barrel calorimeter based on CsI scintillation crystals and endcap calorimeter made of BGO scintillation crystals. Construction and tests of the calorimeters are described, first results from the experimental runs are presented.

Epifanov, Denis

2011-04-01

93

Performance of the SLD Warm Iron Calorimeter prototype  

SciTech Connect

A prototype hadron calorimeter, of similar design to the Warm Iron Calorimeter (WIC) planned for the SLD experiment, has been built and its performance has been studied in a test beam. The WIC is an iron sampling calorimeter whose active elements are plastic streamer tubes similar to those used for the Mont-Blanc proton decay experiment. The construction and operation of the tubes will be briefly described together with their use in an iron calorimeter - muon tracker. Efficiency, resolution and linearity have been measured in a hadron/muon beam up to 11 GeV. The measured values correspond to the SLD design goals.

Callegari, G.; Piemontese, L.; DeSangro, R.; Peruzzi, I.; Piccolo, M.; Busza, W.; Friedman, J.; Johnson, A.; Kendall, H.; Kistiakowsky, V.

1986-02-01

94

More iteration space tiling  

Microsoft Academic Search

Subdividing the iteration space of a loop into blocks or tiles with a fixed maximum size has several advantages. Tiles become a natural candidate as the unit of work for parallel task scheduling. Synchronization between processors can be done between tiles, reducing synchronization frequency (at some loss of potential parallelism). The shape and size of a tile can be optimized

Michael Wolfe

1989-01-01

95

Steel specification for the Atlas calorimeter  

SciTech Connect

As part of a collaborative experimental High Energy Physics experiment at the LHC Facility, CERN Laboratory, Geneva Switzerland, a group of US institutions has accepted the responsibility for constructing a large portion of the calorimeter for this experiment. This device is referred to as the Tile Calorimeter. The Tile Calorimeter has three major elements, a large center section (Barrel), and two end sections (Extended Barrel). The US group will be responsible for the construction of one of these extended barrel sections. All of the components that are required to construct this device will be fabricated in the US over a period of three years commencing in 1998. Another similar element and the barrel element will be constructed in both eastern and western Europe by parallel groups. The extended barrel is a cylindrical device approximately 8.5 meters (28 ft.) OD x 4.5 meters (14 ft.) ID, made up of 64 wedges. Each of these wedges (see Attachment 1) is constructed by bolting submodules to a strongback girder. Each submodule is constructed of a series of sheets that are welded and glued together. This document summarizes the characteristics and specifications of these steel sheets. The Tile Calorimeter is the return path for the magnet flux of the ATLAS internal superconducting 2T solenoid, therefore its steel magnetic properties are important.

Guarino, V.

1998-02-10

96

The ATLAS Liquid Argon Calorimeters : Construction, Integration, Commissionning  

NASA Astrophysics Data System (ADS)

The ATLAS liquid argon calorimeter system consists of an electromagnetic barrel calorimeter and two end-caps comprising electromagnetic, hadronic and forward calorimeters. The construction of the full calorimeter system is completed since mid-2004. After construction in the home institutes, the modules have been integrated into wheels, and inserted into their respective cryostats. Results of electrical and mechanical quality checks performed during module construction, integration into wheels, cold test of complete calorimeter systems before and after lowering into the ATLAS cavern are reported. Finally, some results obtained from the first commissionning data are presented.

Schwemling, Ph.

2007-10-01

97

Sarcophagus of the CMS Zero Degree Calorimeters  

NASA Astrophysics Data System (ADS)

The Zero Degree Calorimeters of the CMS experiment at the Large Hadron Collidor will become significantly radioactive after the first few proton-proton runs. The detectors sit within large copper blocks, called TANS, that also include the two beam pipes. The calorimeters must be removed during bake out of the beam pipes. To minimize the radiation received by the personal a remotely controlled crane will place the calorimeters into a sarcophagus that will shield workers from the induced radioactivity. Both the mass and size of the sarcophagus are limited by constraints of the LHC tunnel. We will describe the design, construction and use of the sarcophagus.

Axton, Kyle; Murray, Michael

2009-10-01

98

Zero Degree Calorimeters Radiation Containment Sarcophagus  

NASA Astrophysics Data System (ADS)

The Zero Degree Calorimeters of the CMS experiment at the Large Hadron Collidor will become significantly radioactive after the first few proton-proton runs. The detectors sit within large copper blocks, called TANS, that also include the two beam pipes. The calorimeters must be removed during bake out of the beam pipes. To minimize the radiation received by the personal a remotely controlled crane will place the calorimeters into a sarcophagus that will shield workers from the induced radioactivity. Both the mass and size of the sarcophagus are limited by constraints of the LHC tunnel. We will describe the design, construction and use of the sarcophagus.

Axton, Kyle

2009-05-01

99

Effect of the muon component of cosmic rays on the results of hadron experiments with the big ionization calorimeter (BIC) of the Tien Shan station  

SciTech Connect

A full-scale simulation of the response of the big ionization calorimeter (BIC) at the Tien Shan station to the passage of single protons and muons was performed on the basis of the GEANT4 package in order to estimate the contribution of the muon cosmic-ray component to the generation of unusual events (such as Anti-Centauros), which were recorded by this facility, and to the imitation of the long-flying component, which changes the shape of the average cascade curve. A comparison of the results of this simulation with experimental data reveals that the appearance of Anti-Centauros may be reasonably explained by the contribution of multiple interactions of single muons, but that muon events are insufficient for explaining the change in the shape of the cascade curve (in particular, the emergence of a second maximum)

Bogdanov, A. G., E-mail: AGBogdanov@mephi.ru; Kokoulin, R. P.; Petrukhin, A. A.; Shalabaeva, A. V. [Moscow Engineering Physics Institute (State University) (Russian Federation); Yakovlev, V. I. [Russian Academy of Sciences, Lebedev Institute of Physics (Russian Federation)

2008-01-15

100

Effect of the muon component of cosmic rays on the results of hadron experiments with the big ionization calorimeter (BIC) of the Tien Shan station  

SciTech Connect

A full-scale simulation of the response of the big ionization calorimeter (BIC) at the Tien Shan station to the passage of single protons and muons was performed on the basis of the GEANT4 package in order to estimate the contribution of the muon cosmic-ray component to the generation of unusual events (such as Anti-Centauros), which were recorded by this facility, and to the imitation of the long-flying component, which changes the shape of the average cascade curve. A comparison of the results of this simulation with experimental data reveals that the appearance of Anti-Centauros may be reasonably explained by the contribution of multiple interactions of single muons, but that muon events are insufficient for explaining the change in the shape of the cascade curve (in particular, the emergence of a second maximum).

Bogdanov, A. G., E-mail: AGBogdanov@mephi.ru; Kokoulin, R. P.; Petrukhin, A. A.; Shalabaeva, A. V. [Moscow Engineering Physics Institute (State University) (Russian Federation); Yakovlev, V. I. [Russian Academy of Sciences, Lebedev Institute of Physics (Russian Federation)

2008-01-15

101

Performance of CDF calorimeter simulation for Tevatron Run II  

SciTech Connect

The upgraded CDF II detector has collected first data during the initial operation of the Tevatron accelerator in Run II. The simulation of the CDF electromagnetic and hadronic central and upgraded plug (forward) calorimeter is based on the Gflash calorimeter parameterization package used within the GEANT based detector simulation of the Run II CDF detector. We present the results of tuning the central and plug calorimeter response to test beam data.

C. Currat

2002-09-19

102

Photon calorimeter  

DOEpatents

A photon calorimeter is provided that comprises a laminar substrate that is uniform in density and homogeneous in atomic composition. A plasma-sprayed coating, that is generally uniform in density and homogeneous in atomic composition within the proximity of planes that are parallel to the surfaces of the substrate, is applied to either one or both sides of the laminar substrate. The plasma-sprayed coatings may be very efficiently spectrally tailored in atomic number. Thermocouple measuring junctions, are positioned within the plasma-sprayed coatings. The calorimeter is rugged, inexpensive, and equilibrates in temperature very rapidly. 4 figs.

Chow, Tze-Show

1988-04-22

103

Photon Calorimeter  

DOEpatents

A photon calorimeter (20, 40) is provided that comprises a laminar substrate (10, 22, 42) that is uniform in density and homogeneous in atomic composition. A plasma-sprayed coating (28, 48, 52), that is generally uniform in density and homogeneous in atomic composition within the proximity of planes that are parallel to the surfaces of the substrate, is applied to either one or both sides of the laminar substrate. The plasma-sprayed coatings may be very efficiently spectrally tailored in atomic number. Thermocouple measuring junctions (30, 50, 54) are positioned within the plasma-sprayed coatings. The calorimeter is rugged, inexpensive, and equilibrates in temperature very rapidly.

Chow, Tze-Show (Hayward, CA)

1989-01-01

104

Double handled brane tilings  

NASA Astrophysics Data System (ADS)

We classify the first few brane tilings on a genus 2 Riemann surface and identify their toric Calabi-Yau moduli spaces. These brane tilings are extensions of tilings on the 2-torus, which represent one of the largest known classes of 4 d superconformal field theories for D3-branes. The classification consists of 16 distinct genus 2 brane tilings with up to 8 quiver fields and 4 superpotential terms. The Higgs mechanism is used to relate the different theories.

Cremonesi, Stefano; Hanany, Amihay; Seong, Rak-Kyeong

2013-10-01

105

Handmade Tile Mosaics  

ERIC Educational Resources Information Center

|Just like the classroom, children's outdoor environments should be filled with artistic creations that add sparkle and imagination to the space. One of the author's favorite ways to add art to the outdoors is by installing a mosaic mural of child-made tiles. The process of making the tiles is fun for all; each tile is a charming work of art in…

Keeler, Rusty

2007-01-01

106

PHENIX electromagnetic calorimeter.  

National Technical Information Service (NTIS)

The main features of the Phenix EM calorimeter are presented. This a Pb/scintillator calorimeter with ''shish-kebab'' fiber readout, designed for low energy electron and photon measurements. Prototype calorimeters have been built with longitudinal segment...

E. Kistenev S. White S. Belikov V. Kochetkov

1993-01-01

107

Ammann Tilings in Symplectic Geometry  

NASA Astrophysics Data System (ADS)

In this article we study Ammann tilings from the perspective of symplectic geometry. Ammann tilings are nonperiodic tilings that are related to quasicrystals with icosahedral symmetry. We associate to each Ammann tiling two explicitly constructed highly singular symplectic spaces and we show that they are diffeomorphic but not symplectomorphic. These spaces inherit from the tiling its very interesting symmetries.

Battaglia, Fiammetta; Prato, Elisa

2013-03-01

108

Uranium scintillator calorimeter at the CERN ISR  

SciTech Connect

The design, Monte Carlo studies and test beam results of a uranium/scintillator calorimeter to be installed in the Intersecting Storage Ring (ISR) at CERN are described. In its final stage the calorimeter will cover the full azimuth over a polar region of 45/sup 0/ < theta < 135/sup 0/. The full calorimeter is built in a modular way from 128 stacks, with each stack internally subdivided into six cells of 20 x 20 cm/sup 2/ cross section. The readout is by wavelength shifting (WLS) plates with a separate readout of the front part of the calorimeter (first ten plates) to allow electromagnetic/hadronic separation. Since the readout plates are on both sides of the cells, position information is obtained from the left/right ratio.

Gordon, H; Killian, T; Ludlam, T

1980-01-01

109

40. West tile gauge on south pier. Each square tile ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

40. West tile gauge on south pier. Each square tile is 4' in size. Bottom right hand corner of west tile - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

110

Tiling the Plaza  

NSDL National Science Digital Library

In this math lesson, learners arrange pattern blocks to create tessellations and to explore geometric patterns. Learners first explore making patterns with a variety of pattern blocks. They next engage in experiments of making tile designs using only one shape by rotating that shape around a point. Finally, they are faced with the situation of entering a contest for creating the best tile design for the new plaza using these geometric shape. Learners are placed into groups and are told to use only the blocks with equal sides and equal angles to create a patterned tile design. Each group makes a tile design and learners vote for the best design.

Pbs

2012-01-01

111

Clustering of Hadronic Showers with a Structural Algorithm  

SciTech Connect

The internal structure of hadronic showers can be resolved in a high-granularity calorimeter. This structure is described in terms of simple components and an algorithm for reconstruction of hadronic clusters using these components is presented. Results from applying this algorithm to simulated hadronic Z-pole events in the SiD concept are discussed.

Charles, M.J.; /SLAC

2005-12-13

112

Tilings as a programming exercise  

Microsoft Academic Search

We investigate the problem of producing symmetric tilings by pro- grams in a uniform way. By this, we mean that the construction of a tiling should be parameterized by the geometric model in which the tiling is dened (Euclidean, Hyperbolic, etc.), its formal symmetry group, the interpretation of this symmetry group in the geometric model and a specic tile that

Guy Cousineau

2002-01-01

113

Tiled Multicore Processors  

Microsoft Academic Search

For the last few decades Moore’s Law has continually provided exponential growth in the number of transistors on a single\\u000a chip. This chapter describes a class of architectures, called tiled multicore architectures, that are designed to exploit massive quantities of on-chip resources in an efficient, scalable manner. Tiled\\u000a multicore architectures combine each processor core with a switch to create a

Michael B. Taylor; Walter Lee; Jason E. Miller; David Wentzlaff; Ian Bratt; Ben Greenwald; Henry Hoffmann; Paul R. Johnson; Jason S. Kim; James Psota; Arvind Saraf; Nathan Shnidman; Volker Strumpen; Matthew I. Frank; Saman Amarasinghe; Anant Agarwal

2009-01-01

114

Calorimeter/absorber optimization for a RHIC dimuon experiment (RD-10 Project)  

SciTech Connect

The RD-10 R D effort on calorimeter/absorber optimization for a RHIC experiment has an extended run in 1991 using the A2 test beam at the AGS. Measurements were made of the leakage of particles behind various hadron calorimeters. Behavior of the calorimeter/absorber as a muon-identifier was studied. First comparisons of results from test measurements to calculated results using the GHEISHA code were made.

Aronson, S.H.; Murtagh, M.J.; Starks, M. (Brookhaven National Lab., Upton, NY (United States)); Liu, X.T.; Petitt, G.A.; Zhang, Ziyang (Georgia State Univ., Atlanta, GA (United States)); Ewell, L.A.; Hill, J.C.; Wohn, F.K. (Iowa State Univ. of Science and Technology, Ames, IA (United States)); Costales, J.B.; Namboodiri, M.N.; Sangster, T.C.; Thomas, J.H. (Lawrence Livermore National Lab., CA (United Stat

1991-01-01

115

Calorimeter/absorber optimization for a RHIC dimuon experiment (RD-10 Project)  

SciTech Connect

The RD-10 R&D effort on calorimeter/absorber optimization for a RHIC experiment has an extended run in 1991 using the A2 test beam at the AGS. Measurements were made of the leakage of particles behind various hadron calorimeters. Behavior of the calorimeter/absorber as a muon-identifier was studied. First comparisons of results from test measurements to calculated results using the GHEISHA code were made.

Aronson, S.H.; Murtagh, M.J.; Starks, M. [Brookhaven National Lab., Upton, NY (United States); Liu, X.T.; Petitt, G.A.; Zhang, Ziyang [Georgia State Univ., Atlanta, GA (United States); Ewell, L.A.; Hill, J.C.; Wohn, F.K. [Iowa State Univ. of Science and Technology, Ames, IA (United States); Costales, J.B.; Namboodiri, M.N.; Sangster, T.C.; Thomas, J.H. [Lawrence Livermore National Lab., CA (United States); Gavron, A.; Waters, L. [Los Alamos National Lab., NM (United States); Kehoe, W.L.; Steadman, S.G. [Massachusetts Inst. of Tech., Cambridge, MA (United States); Awes, T.C.; Obenshain, F.E.; Saini, S.; Young, G.R. [Oak Ridge National Lab., TN (United States); Chang, J.; Fung, S.Y.; Kang, J.H. [California Univ., Riverside, CA (United States); Kreke, J.; He, Xiaochun; Sorensen, S.P. [Tennessee Univ., Knoxville, TN (United States); Cornell, E.C.; Maguire, C.F. [Vanderbilt Univ., Nashville, TN (United States)

1991-12-31

116

Properties of a Sampling Calorimeter with Warm-Liquid Ionization Chambers  

NASA Astrophysics Data System (ADS)

An iron sampling calorimeter with warm-liquid ionization chambers has been tested at the CERN SPS in order to study the signal development and to verify the energy calibration of the hadron calorimeter in the KASCADE-Grande air shower experiment. The signal calibration of the detectors is discussed. First results of the analysis of the longitudinal shower development in the calorimeter are presented and compared with results from simulations based on the GEANT/FLUKA code.

Plewnia, S.; Berghöfer, Th.; Blümer, H.; Engler, J.; Hörandel, J. R.; Milke, J.; Wochele, J.; Buchholz, P.; Lixandru, R.; Walkowiak, W.

2005-02-01

117

Performance of the uranium\\/plastic scintillator calorimeter for the HELIOS experiment at CERN  

Microsoft Academic Search

We describe the calorimeter system serving the HELIOS experiment at CERN, its calibration, and its performances measured in test experiments. The calorimeter signal for hadrons was found to be proportional to the energy to within 2% over the energy range 8-200 GeV. Over the same energy range the energy resolution sigma\\/E scales as 1\\/sqrt(E) for both electromagnetic and hadronic showers.

T. Åkesson; Aris L S Angelis; F. Corriveau; R. C. E. Devenish; G. di Tore; Christian Wolfgang Fabjan; F. Lamarche; C. Leroy; M. L. McCubbin; N. A. McCubbin; L. H. Olsen; M. Seman; Y. Sirois; R. Wigmans; W. J. Willis

1987-01-01

118

The Calorimeter Systems for the sPHENIX Experiment at RHIC  

NASA Astrophysics Data System (ADS)

A major upgrade is being planned for the PHENIX experiment that will have greatly enhanced physics capabilities to measure jets in relativistic heavy ion collisions at RHIC, as well as in polarized proton interactions, and eventually electron ion collisions at an Electron Ion Collider. This upgrade, sPHENIX, will include two new calorimeter systems. One will be a hadronic calorimeter, which will be the first hadronic calorimeter ever used in an experiment at RHIC, and another will be a new compact electromagnetic calorimeter. Both calorimeters will cover a region of +/-1.1 in pseudorapidity and 2? in phi. The hadron calorimeter will be based on scintillator plates interspersed between steel absorber plates and read out with wavelength shifting fibers. The electromagnetic calorimeter will be an accordion design that will utilize scintillating fibers embedded in a matrix consisting of tungsten plates, tungsten powder and epoxy. The readout for both calorimeters will use silicon photomultipliers. The overall design of these two calorimeter systems is described along with the R&D efforts currently being pursued to develop them along with their readout.

Woody, C.; Kistenev, E.; the PHENIX Collaboration

2012-12-01

119

Wood Brick Tile for Paneling.  

National Technical Information Service (NTIS)

Wood-brick tile is a new decorative paneling for homes, offices, and public buildings. The tiles are thin rectangular pieces of wood with chamfered edges and are applied with an adhesive to produce a brick and mortar pattern. Wood tile panels are especial...

G. A. Cooper E. G. Champagne

1967-01-01

120

Secondary Emission Calorimeter Sensor Development  

NASA Astrophysics Data System (ADS)

In a Secondary Emission electron(SEe) detector module, Secondary Emission electrons (SEe) are generated from an SE surface/cathode, when charged hadronic or electromagnetic particles, particularly shower particles, penetrate an SE sampling module placed between absorber materials (Fe, Cu, Pb, W etc) in calorimeters. The SE cathode is a thin (10-50 nm thick) film (simple metal-oxides, or other higher yield materials) on the surface of a metal plate, which serves as the entrance “window” to a compact vacuum vessel (metal or metal-ceramic); this SE film cathode is analogous to a photocathode, and the SEe are similar to p.e., which are then amplified by dynodes, also is in a PMT. SE sensor modules can make use of electrochemically etched/machined or laser-cut metal mesh dynode sheets, as large as ~30 cm square, to amplify the Secondary Emission Electrons (SEe), much like those that compact metal mesh or mesh dynode PMT's use to amplify p.e.'s. The construction requirements easier than a PMT, since the entire final assembly can be done in air; there are no critical controlled thin film depositions, cesiation or other oxygen-excluded processes or other required vacuum activation, and consequently bake-out can be a refractory temperatures; the module is sealed by normal vacuum techniques (welding or brazing or other high temperature joinings), with a simple final heated vacuum pump-out and tip-off. The modules envisioned are compact, high gain, high speed, exceptionally radiation damage resistant, rugged, and cost effective, and can be fabricated in arbitrary tileable shapes. The SE sensor module anodes can be segmented transversely to sizes appropriate to reconstruct electromagnetic cores with high precision. The GEANT4 and existing calorimeter data estimated calorimeter response performance is between 35-50 Secondary Emission electrons per GeV, in a 1 cm thick Cu absorber calorimeter, with a gain per SEe > 105 per SEe, and an e/pi<1.2. The calorimeter pulse width is estimated to be <15 ns. With fine mesh sampling only (no thick absorbers) the resolution is ~25 MeV at 1 GeV.

Winn, David R.; Onel, Yasar

2012-12-01

121

Latin-Square Tiling  

ERIC Educational Resources Information Center

The author presents a variation of a tiling problem where each row or column contains a complete set of elements, each diagonal is free of contiguous like elements, and at least one partition exists. These restrictions limit the number of solutions considerably, and methods of solution are subsequently discussed. (CT)

Gridgeman, N. T.

1971-01-01

122

Hadron hadron collider group  

SciTech Connect

The objective of this group was to make a rough assessment of the characteristics of a hadron-hadron collider which could make it possible to study the 1 TeV mass scale. Since there is very little theoretical guidance for the type of experimental measurements which could illuminate this mass scale, we chose to extend the types of experiments which have been done at the ISR, and which are in progress at the SPS collider to these higher energies.

Palmer, R.; Peoples, J.; Ankenbrandt, C.

1982-01-01

123

The D0 calorimeter trigger  

SciTech Connect

The D0 calorimeter trigger system consists of many levels to make physics motivated trigger decisions. The Level-1 trigger uses hardware techniques to reduce the trigger rate from {approximately} 100kHz to 200Hz. It forms sums of electromagnetic and hadronic energy, globally and in towers, along with finding the missing transverse energy. A minimum energy is set on these energy sums to pass the event. The Level-2 trigger is a set of software filters, operating in a parallel-processing microvax farm which further reduces the trigger rate to a few Hertz. These filters will reject events which lack electron candidates, jet candidates, or missing transverse energy in the event. The performance of these triggers during the early running of the D0 detector will also be discussed.

Guida, J. [Brookhaven National Lab., Upton, NY (United States); D0 Collaboration

1992-12-01

124

The D0 calorimeter trigger  

SciTech Connect

The D0 calorimeter trigger system consists of many levels to make physics motivated trigger decisions. The Level-1 trigger uses hardware techniques to reduce the trigger rate from [approximately] 100kHz to 200Hz. It forms sums of electromagnetic and hadronic energy, globally and in towers, along with finding the missing transverse energy. A minimum energy is set on these energy sums to pass the event. The Level-2 trigger is a set of software filters, operating in a parallel-processing microvax farm which further reduces the trigger rate to a few Hertz. These filters will reject events which lack electron candidates, jet candidates, or missing transverse energy in the event. The performance of these triggers during the early running of the D0 detector will also be discussed.

Guida, J. (Brookhaven National Lab., Upton, NY (United States))

1992-12-01

125

The lead-glass electromagnetic calorimeter for the SELEX experiment  

SciTech Connect

A large-acceptance, highly segmented electromagnetic lead glass calorimeter for Experiment E781 (SELEX) at Fermi National Acceleration Laboratory was designed and built. This detector has been used to reconstruct photons and electrons with energies ranging from few GeV up to 500 GeV in the collisions of the 650 GeV {Sigma}{sup -} hyperons and {pi}{sup -} mesons with the target nucleons. The design, calibration and performance of the calorimeter are described. Energy resolution and position resolution are assessed using both calibration electron beams and {pi}{sup 0} mesons reconstructed in 650 GeV hadron-hadron interactions. The performance of the calorimeter in selecting resonant states that involve photons is demonstrated.

M. Y. Balatz et al.

2004-07-19

126

Calorimeter Performance for Tau Reconstruction and Identification at ATLAS  

NASA Astrophysics Data System (ADS)

The ATLAS physics program involving tau final states ranges from Standard Model measurements involving W, Z, and top pair production, to searches for the Higgs, Supersymmetry and other beyond the Standard Model signatures. The ATLAS calorimeter plays a crucial role in the reconstruction and identification of hadronically decaying tau leptons in ATLAS. This proceeding discusses the role of the calorimeter in reconstructing the tau energy, as well as methods to measure the systematic uncertainties on the tau energy scale. The calorimeter is further a key component in building identification variables used to differentiate tau candidates from hadronic jets. The role of these variables is presented, and the use of variables in high luminosity environments is also discussed. A brief overview of the impact of the tau energy scale and identification efficiency uncertainties in searches for new physics with tau-based signatures is also given.

Volpi, Matteo; ATLAS Collaboration

2012-12-01

127

Triangular Tile Self-assembly Systems  

Microsoft Academic Search

\\u000a We discuss theoretical aspects of the self-assembly of triangular tiles; in particular, right triangular tiles and equilateral\\u000a triangular tiles. Contrary to intuition, we show that triangular tile assembly systems and square tile assembly systems are\\u000a not comparable in general. More precisely, there exists a square tile assembly system S such that no triangular tile assembly system that is a division

Lila Kari; Shinnosuke Seki; Zhi Xu

2010-01-01

128

Measurement of the time development of particle showers in a uranium scintillator calorimeter  

Microsoft Academic Search

We report on the time evolution of particle showers, as measured in modules of the uranium-scintillator barrel calorimeter of the ZEUS detector. The time development of hadronic showers differs significantly from that of electromagnetic showers, with about 40% of the response to hadronic showers arising from energy depositions which occur late in the shower development. The degree of compensation and

A. Caldwell; L. Hervás; J. A. Parsons; F. Sciulli; W. Sippach; L. Wai

1993-01-01

129

The AMS-02 lead-scintillating fibres Electromagnetic Calorimeter  

NASA Astrophysics Data System (ADS)

The Electromagnetic Calorimeter (ECAL) of the AMS-02 experiment is a fine grained lead-scintillating fibres sampling calorimeter that allows for a precise three-dimensional imaging of the longitudinal and lateral shower development. It provides a high (?106) electron/hadron discrimination with the other AMS-02 detectors [1] and good energy resolution. The calorimeter also provides a standalone photon trigger capability to AMS-02. The mechanical assembly was realized to ensure minimum weight, still supporting the intrinsically heavy calorimeter during launch. ECAL light collection system and electronics are designed to measure electromagnetic particles over a wide energy range, from GeV up to TeV. A full-scale flight-like model was tested using electrons and proton beams with energies ranging from 6 to 250 GeV.

Adloff, C.; Basara, L.; Bigongiari, G.; Bosi, F.; Brun, P.; Cadoux, F.; Cervelli, F.; Chambert, V.; Chen, G.; Chen, G. M.; Chen, H. S.; Coignet, G.; Cougoulat, G.; Di Falco, S.; Dubois, J. M.; Elles, S.; Falchini, E.; Fiasson, A.; Fougeron, D.; Fouque, N.; Galeotti, S.; Gallucci, G.; Gherarducci, F.; Girard, L.; Giuseppe, F.; Goy, C.; Hermel, R.; Incagli, M.; Jacquemier, J.; Journet, L.; Kossakowski, R.; Lepareur, V.; Li, Z. H.; Lieunard, B.; Lomtadze, T.; Lu, Y. S.; Maestro, P.; Magazzù, C.; Maire, M.; Orsini, A.; Paniccia, M.; Pedreschi, E.; Peltier, F.; Piendibene, M.; Pilo, F.; Pochon, J.; Rambure, T.; Rosier-Lees, S.; Spinella, F.; Tang, X. W.; Tassan-Viol, J.; Tazzioli, A.; Vannini, C.; Vialle, J. P.; Zhuang, H. L.

2013-06-01

130

A Measurement of the Energy Spectrum of Unaccompanied Hadrons  

NASA Astrophysics Data System (ADS)

The energy spectrum of unaccompanied hadrons is measured with the large hadron calorimeter of the KASCADE experiment. From the measured flux at detector level the primary proton spectrum at the top of the atmosphere has been derived. The flux obtained is well compatible with results of direct measurements.

Müller, M.; Antoni, T.; Apel, W. D.; Badea, F.; Bekk, K.; Bercuci, A.; Blümer, H.; Bozdog, H.; Brancus, I. M.; Büttner, C.; Chilingarian, A.; Daumiller, K.; Doll, P.; Engel, R.; Engler, J.; Feßler, F.; Gils, H. J.; Glasstetter, R.; Haungs, A.; Heck, D.; Hörandel, J. R.; Iwan, A.; Kampert, K.-H.; Klages, H. O.; Maier, G.; Mathes, H. J.; Mayer, H. J.; Milke, J.; Obenland, R.; Oehlschläger, J.; Ostapchenko, S.; Petcu, M.; Rebel, H.; Risse, M.; Roth, M.; Schatz, G.; Schieler, H.; Scholz, J.; Thouw, T.; Ulrich, H.; van Buren, J.; Vardanyan, A.; Weindl, A.; Wochele, J.; Zabierowski, J.

2003-07-01

131

X-ray calorimeters  

Microsoft Academic Search

X-ray calorimeter instruments for astrophysics have seen rapid development since they were invented in 1984. The prime instrument on all currently planned X-ray spectroscopic observatories is based on calorimeter technology. This relatively simple detection concept that senses the energy of an incident photon by measuring the temperature rise of an absorber material at very low temperatures can form the basis

F. Scott Porter

2010-01-01

132

X-ray calorimeters  

NASA Astrophysics Data System (ADS)

X-ray calorimeter instruments for astrophysics have seen rapid development since they were invented in 1984. The prime instrument on all currently planned X-ray spectroscopic observatories is based on calorimeter technology. This relatively simple detection concept that senses the energy of an incident photon by measuring the temperature rise of an absorber material at very low temperatures can form the basis of a very high-performance, non-dispersive spectrometer. State-of-theart calorimeter instruments have resolving powers of over 3000, large simultaneous bandpasses, and near unit efficiency. This coupled with the intrinsic imaging capability of a pixilated X-ray calorimeter array, allows true spectral-spatial instruments to be constructed. This chapter briefly reviews the detection scheme, the state of the art in X-ray calorimeter instruments and the future outlook for this technology.

Porter, F. Scott

133

Hadron-hadron colliders  

SciTech Connect

The objective is to investigate whether existing technology might be extrapolated to provide the conceptual framework for a major hadron-hadron collider facility for high energy physics experimentation for the remainder of this century. One contribution to this large effort is to formalize the methods and mathematical tools necessary. In this report, the main purpose is to introduce the student to basic design procedures. From these follow the fundamental characteristics of the facility: its performance capability, its size, and the nature and operating requirements on the accelerator components, and with this knowledge, we can determine the technology and resources needed to build the new facility.

Month, M.; Weng, W.T.

1983-06-21

134

DREAM (Dual-REAdout Module) calorimeter module  

NASA Astrophysics Data System (ADS)

DREAM (Dual-REAdout Module) calorimeter module, built at TTU, is a unique detector prototype consisting of scintillating and clear optical fibers in a copper absorber matrix. It contains 15 km of scintillating and 30 km of clear (fused silica and clear plastic) fibers in 1600 kg of copper. I will describe the construction details of this detector and the results obtained from beam tests carried out at CERN with high energy electrons, pions and muons. This calorimeter achieves a superior hadronic energy resolution due to the fact that the fluctuations in the electromagnetic energy fraction can be measured on an event-by-event basis using clear fibers. I will describe this technique in detail along with other novel results.

Carrell, Kenneth

2003-10-01

135

Arithmetic theory of brick tilings  

SciTech Connect

A new, 'arithmetic', approach to the algebraic theory of brick tilings is developed. This approach enables one to construct a simple classification of brick tilings in Z{sup d} and to find new proofs of several classical results on brick packing and tilings in Z{sup d}. In addition, possible generalizations of results on integer brick packing to the Euclidean plane R{sup 2} are investigated.

Egorov, A V; Prikhod'ko, A A [M.V. Lomonosov Moscow State University, Moscow (Russian Federation)

1998-12-31

136

Design and implementation of the Front End Board for the readout of the ATLAS liquid argon calorimeters  

Microsoft Academic Search

The ATLAS detector has been designed for operation at CERN's Large Hadron Collider. ATLAS includes a complex system of liquid argon calorimeters. The electronics for amplifying, shaping, sampling, pipelining, and digitizing the calorimeter signals is implemented on the Front End Boards (FEBs). This paper describes the design, implementation and production of the FEBs and presents measurement results from testing performed

N. J. Buchanan; L. Chen; D. M. Gingrich; S. Liu; H. Chen

2008-01-01

137

Covering the Plane with Rep-Tiles.  

ERIC Educational Resources Information Center

Presents an activity in which students use geometric figures, rep-tiles, to design a tile floor. Rep-tiles are geometric figures of which copies can fit together to form a larger similar figure. Includes reproducible student worksheet. (MKR)

Fosnaugh, Linda S.; Harrell, Marvin E.

1996-01-01

138

End Calorimeter Warm Tube Heater  

Microsoft Academic Search

The Tevatron accelerator beam tube must pass through the End Calorimeter cryostats of the D-Zero Collider Detector. Furthermore, the End Calorimeter cryostats must be allowed to roll back forty inches without interruption of the vacuum system; hence, the Tev tube must slide through the End Calorimeter cryostat as it is rolled back. The Tev pass through the End Calorimeter can

K. Primdahl

1991-01-01

139

Some Generalizations of the Pinwheel Tiling  

Microsoft Academic Search

.    We introduce a new family of nonperiodic tilings, based on a substitution rule that generalizes the pinwheel tiling of Conway\\u000a and Radin. In each tiling the tiles are similar to a single triangular prototile. In a countable number of cases, the tiles\\u000a appear in a finite number of sizes and an infinite number of orientations. These tilings generally

L. Sadun

1998-01-01

140

The PHENIX electromagnetic calorimeter  

SciTech Connect

The main features of the Phenix EM calorimeter are presented. This a Pb/scintillator calorimeter with ``shish-kebab`` fiber readout, designed for low energy electron and photon measurements. Prototype calorimeters have been built with longitudinal segmentation, {approximately} 100 psec time of flight resolution and 8% energy resolution at 1GeV/c. The laser based monitoring system which has been incorporated into large scale prototypes is described. The dependence of light yield on fiber choice and scintillator surface preparation has been studied.

Kistenev, E.; White, S. [Brookhaven National Lab., Upton, NY (United States); Belikov, S.; Kochetkov, V. [Institut Fiziki Vysokikh Ehnergij, Protvino (Russian Federation)

1993-12-31

141

LINEAR RECURRENCES THROUGH TILINGS AND MARKOV CHAINS  

Microsoft Academic Search

We present a tiling interpretation for k-th order linear recurrences, which yields new combinatorial proofs for recurrence identities. Moreover, viewing the tiling process as a Markov chain also yields closed form Binet-like expressions for these recurrences. The theme of this paper is the use of tilings and a random tiling pro- cess as a general method for understanding and proving

ARTHUR T. BENJAMIN; CHRISTOPHER R. H. HANUSA; FRANCIS EDWARD SU

142

Low energy response of the D0 calorimeter and jet energy measurement  

SciTech Connect

Previous studies of the D{O} calorimeter with electron and hadron beams above 10 GeV/c have shown excellent linearity of response and e/{pi} ratio close to one. Here we report on our measurements of the response of the DO central calorimeter modules down to 2 GeV/c. The measured low energy response for electrons and pions are fragmentation from the PYTHIA Monte Carlo to obtain the corrections for jet energy.

Bhat, P.C.; D0 Collaboration

1992-11-01

143

The production of radiation tolerant vacuum phototriodes and their HV filters for the Compact Muon Solenoid endcap electromagnetic calorimeter  

Microsoft Academic Search

Particle detectors which will operate at the Large Hadron Collider face unprecedented challenges in both the number of active detector elements and in operating without maintenance in a high radiation environment for many years. In the Compact Muon Solenoid (CMS) detector the scintillating crystal electromagnetic calorimeter uses vacuum photodetectors in the endcap where the lifetime neutron and hadron fluence is

P. R. Hobson

2007-01-01

144

NEUTRON-ENHANCED CALORIMETRY FOR HADRONS (NECH): FINAL REPORT  

SciTech Connect

We present the results of a project to apply scintillator technology recently developed at Louisiana Tech University to hadronic calorimetry. In particular, we developed a prototype calorimeter module incorporating scintillator embedded with metal oxide nanoparticles as the active layers. These metal oxide nanoparticles of gadolinium oxide, have high cross-sections for interactions with slow neutrons. As a part fo this research project, we have developed a novel method for producing plastic scintillators with metal oxide nanoparticles evenly distributed through the plastic without aggregation.We will test the performance of the calorimeter module in test beam and with a neutron source, in order to measure the response to the neutron component of hadronic showers. We will supplement our detector prototyping activities with detailed studies of the effect of neutron component on the resolution of hadronic energy measurements, particular in the next generation of particle flow calorimeters.

Andrew Stroud, Lee Sawyer

2012-08-31

145

The ATLAS liquid argon calorimeters: Construction, integration, commissioning and performance from selected beam-test results  

NASA Astrophysics Data System (ADS)

The ATLAS liquid argon calorimeter system consists of an electromagnetic barrel calorimeter and two end-caps comprising electromagnetic, hadronic and forward calorimeters. The construction of the full calorimeter system is completed since mid-2004. After construction in the home institutes, the modules have been integrated into wheels, and inserted into their respective cryostats. The readout electronics has also been installed and commissioned. Results of electrical and mechanical quality checks performed during module construction, integration into wheels, cold test of complete calorimeter systems before and after lowering into the ATLAS cavern are reported. Some performance results on response linearity, energy resolution, muon detection and timing resolution, all obtained from the extensive test-beam program done during the construction and integration, are shown. These results confirm that the detector will meet the required physics performance. Since 2006, a continuously increasing fraction of the detector is tested using cosmic muons, and some results obtained from these data are presented.

Schwemling, Ph.

2009-01-01

146

Toward Meaningful Simulations of Hadronic Showers  

NASA Astrophysics Data System (ADS)

The physics processes that are crucial for the description of hadronic shower development in calorimeters are ?0 production, the release of protons in nuclear reactions and (in calorimeters with hydrogenous active material) elastic scattering of soft neutrons. In this paper, I discuss how we know that these elements are crucial, and I describe experimental data that are sensitive to a correct implementation of these elements in simulation codes. Therefore, these data should serve as benchmarks for (generic) validation of these codes. I also illustrate the practical importance of reliable shower simulations with some recent real-life examples.

Wigmans, Richard

2007-03-01

147

Central Calorimeter configuration: A study report to the SDC Technical Board  

SciTech Connect

The single most important determinant of the overall Central Calorimeter (CC) shape is the criterion for depth of hadron shower containment. This criterion and its rapidity dependence is discussed in a companion document to this report titled ``Depth Requirements in SSC Calorimeters`` by a D. Green et al., SDC-91-00016. The conclusion reached there is that the calorimeter should be 10 {lambda} thick at {eta} = 0 and increase smoothly to 12 {lambda} at {eta} = 3. We adopt this criterion in this report and discuss the mechanical properties and design details of a CC that meets this condition.

Kirk, T.B.W.; Wicklund, A.B.

1991-04-11

148

Self-Similar Lattice Tilings  

Microsoft Academic Search

We study the general question of the existence of self-similar lattice tilings of Euclidean space. A necessary and sufficient\\u000a geometric condition on the growth of the boundary of approximate tiles is reduced to a problem in Fourier analysis that is\\u000a shown to have an elegant simple solution in dimension one. In dimension two we further prove the existence of connected

Karlheinz Grochenig; Andrew Haas

1994-01-01

149

Addition of photosensitive dopants to the D0 liquid argon calorimeter  

SciTech Connect

The addition of photosensitive dopants to liquid argon greatly enhances the signal from heavily ionizing particles. Since binding energy losses we correlated with the heavily ionizing component in hadronic showers, the addition of photosensitive dopants has been suggested as a mechanism to tune the e/{pi} ratio in liquid argon calorimeters. A measurement was performed at the FNAL test beam, adding 4 ppM tetramethylgermanium to the D{phi} uranium-liquid argon calorimeter. An increase in response for electromagnetic and hadronic showers was observed, with no net change in the e/{pi} ratio.

Amos, N.A.; Anderson, D.F.; The D0 Collaboration

1992-10-01

150

Performance of a dual readout calorimeter with a BGO electromagnetic section  

NASA Astrophysics Data System (ADS)

The dual readout technique has been tested on a hybrid calorimeter. The electromagnetic section of this instrument consists of 100 BGO crystals and the hadronic section is made out scintillating and Cherenkov fibers embedded in a copper matrix (DREAM). The electromagnetic fraction of hadronic showers is evaluated on an event-by-event basis from the relative amounts of Cherenkov and scintillation lights produced in the shower development. The performance of such a calorimeter in terms of energy resolution is presented. Effects of side leakage on detector performance are also studied.

Gaudio, Gabriella; Dream Collaboration

2011-04-01

151

Americium/curium calorimeter  

SciTech Connect

This paper will describe a new calorimeter design currently under development at the Savannah River Technology Center. The new design concept was selected due to extreme facility conditions and is similar to commercial, small-scale calorimeters. Material to be measured is a vitrified americium/curium mixture generating approximately 50 watts per container. The facility environment for this application is extreme compared to a typical calorimeter environment. Background radiation levels are estimated to be 22,400 rads/hour and temperature variations are expected to follow outside conditions. Measurements will be conducted in a remote cell utilizing manipulators. A prototype was fabricated and testing completed to demonstrate the concept. Data from the prototype testing will be presented.

ReFalo, L.A.

2000-06-14

152

Automated calorimeter testing system  

SciTech Connect

The Automated Calorimeter Testing System (ACTS) is a portable measurement device that provides an independent measurement of all critical parameters of a calorimeter system. The ACTS was developed to improve productivity and performance of Mound-produced calorimeters. With ACTS, an individual with minimal understanding of calorimetry operation can perform a consistent set of diagnostic measurements on the system. The operator can identify components whose performance has deteriorated by a simple visual comparison of the current data plots with previous measurements made when the system was performing properly. Thus, downtime and out of control'' situations can be reduced. Should a system malfunction occur, a flowchart of troubleshooting procedures has been developed to facilitate quick identification of the malfunctioning component. If diagnosis is beyond the capability of the operator, the ACTS provides a consistent set of test data for review by a knowledgeable expert. The first field test was conducted at the Westinghouse Savannah River Site in early 1990. 6 figs.

Rodenburg, W.W.; James, S.J.

1990-01-01

153

End Calorimeter Warm Tube Heater  

SciTech Connect

The Tevatron accelerator beam tube must pass through the End Calorimeter cryostats of the D-Zero Collider Detector. Furthermore, the End Calorimeter cryostats must be allowed to roll back forty inches without interruption of the vacuum system; hence, the Tev tube must slide through the End Calorimeter cryostat as it is rolled back. The Tev pass through the End Calorimeter can actually be thought of as a cluster of concentric tubes: Tev tube, warm (vacuum vessel) tube, IS layers of superinsulation, cold tube (argon vessel), and Inner Hadronic center support tube. M. Foley generated an ANSYS model to study the heat load. to the cryostat. during collider physics studies; that is, without operation of the heater. A sketch of the model is included in the appendix. The vacuum space and superinsulation was modeled as a thermal solid, with conductivity derived from tests performed at Fermilab. An additional estimate was done. by this author, using data supplied by NR-2. a superinsulation manufacturer. The ANSYS result and hand calculation are in close agreement. The ANSYS model was modified. by this author. to incorporate the effect of the heater. Whereas the earlier model studied steady state operation only. the revised model considers the heater-off steady state mode as the initial condition. then performs a transient analysis with a final load step for time tending towards infinity. Results show the thermal gradient as a function of time and applied voltage. It should be noted that M. Foley's model was generated for one half the warm tube. implying the tube to be symmetric. In reality. the downstream connection (relative to the collision point) attachment to the vacuum shell is via several convolutions of a 0.020-inch wall bellows; hence. a nearly adiabatic boundary condition. Accordingly. the results reported in the table reflect extrapolation of the curves to the downstream end of the tube. Using results from the ANSYS analysis, that is, tube temperature and corresponding heat flux, temperature of the nichrome wire can be estimated. The possibility of frost is of genuine concern, as evidenced by the 250 K minimum temperature for the warm tube while heaters are not operating. Noting that steady state operation at 1 Amp (40 volts) allows the nichrome wire to stay below the critical temperature for Kapton, a conservative plan is to allow several days of heater operation, at 1 Amp (40 volts), before roll-back. Warm-up can be accelerated by operating the heaters in excess of 1 Amp, as evidenced by the test where a maximum of 3.2 Amp was supplied. Operating the heaters in excess of 1 Amp must be done with care since a rapid rise in temperature will likely occur once any ice present has been melted.

Primdahl, K.; /Fermilab

1991-08-06

154

The ALICE electromagnetic calorimeter  

NASA Astrophysics Data System (ADS)

ALICE is the general purpose experiment at the LHC dedicated to the study of heavy-ion collisions. The electromagnetic calorimeter (EMCal) is a late addition to the ALICE suite of detectors with first modules installed in ALICE this year. The EMCal is designed to trigger on high energy gamma-rays and jets, and to enhance the capabilities of ALICE for these measurements. The EMCal is a Pb/scintillator sampling shish-kebab type calorimeter. The EMCal construction, readout, and performance in beam tests at the CERN SPS and PS are described.

Awes, Terry C.; ALICE Collaboration

2010-05-01

155

Hierarchical Self Assembly of Patterns from the Robinson Tilings: DNA Tile Design in an Enhanced Tile Assembly Model.  

PubMed

We introduce a hierarchical self assembly algorithm that produces the quasiperiodic patterns found in the Robinson tilings and suggest a practical implementation of this algorithm using DNA origami tiles. We modify the abstract Tile Assembly Model, (aTAM), to include active signaling and glue activation in response to signals to coordinate the hierarchical assembly of Robinson patterns of arbitrary size from a small set of tiles according to the tile substitution algorithm that generates them. Enabling coordinated hierarchical assembly in the aTAM makes possible the efficient encoding of the recursive process of tile substitution. PMID:23226722

Padilla, Jennifer E; Liu, Wenyan; Seeman, Nadrian C

2012-06-01

156

Positivity, posynomials and tile size selection  

Microsoft Academic Search

Abstract—Tiling is a widely,used,loop,transformation,for exposing\\/exploiting parallelism,and,data locality. Effective use of tiling requires selection and,tuning,of the tile sizes. This is usually achieved,by developing,cost models,that characterize the performance,of the tiled program,as a function,of tile sizes. All previous,approaches,to tile size selection (TSS) are,cost model specific. Due to this they are neither extensible (e.g., to richer program classes\\/newer architectures) nor scalable (e.g., to multiple

Lakshminarayanan Renganarayanan; Sanjay V. Rajopadhye

2008-01-01

157

The ATLAS hadronic tau trigger  

NASA Astrophysics Data System (ADS)

With the high luminosities of proton-proton collisions achieved at the LHC, the strategies for triggering have become more important than ever for physics analysis. The naive inclusive single tau lepton triggers now suffer from severe rate limitations. To allow for a large program of physics analyses with taus, it is required that we combine tau signatures with other objects, including electrons, muons and missing transverse energy (MET). These combined triggers open many opportunities to study new physics beyond the Standard Model and to search for the Standard Model Higgs. We present the status and performance of the hadronic tau trigger in ATLAS. We explain how hadronic tau events are identified at trigger level using the ATLAS calorimeter and tracking system. Results from performance studies of the tau trigger are also shown, including measurements of the trigger efficiency using Z ? ?? events.

Radloff, Peter

2013-03-01

158

On the electronics for Experiment E687's trigger on hadron momenta  

SciTech Connect

The purpose of this paper is to describe the electronic modules designed to process the E687 hadron calorimeter's 552 readout channels and generate a trigger signal based upon the total momentum and the total transverse momentum of the detected hadrons.

Ramusino, A.C.; Hansen, S. (Fermi National Accelerator Lab., Batavia, IL (USA)); Buchholz, D. (Northwestern Univ., Evanston, IL (USA))

1990-07-01

159

Ceramic tiles: above and beyond traditional applications  

Microsoft Academic Search

At present ceramic tiles are already being marketed with characteristics and performance features that make them products whose applications go far beyond traditional tile uses. These are not just future possibilities: their industrial and commercial reality already makes them immediately serviceable in multiple environments. And this is precisely the key concept in these new tile applications: their features make them

A. Moreno

160

Mixing Times of Plane Random Rhombus Tilings  

Microsoft Academic Search

We address the question of single flip discrete dynamics in sets of two-dimensional random rhombus tilings with fixed polygonal boundaries. Single flips are local rearrangements of tiles which enable to sample the configuration sets of tilings via Markov chains. We determine the convergence rates of these dynamical processes towards the statistical equilibrium distributions and we demonstrate that the dynamics are

Nicolas Destainville

2001-01-01

161

Radionuclide calorimeter system  

DOEpatents

A circuit for measuring temperature differentials in a calorimeter is disclosed. The temperature differential between the reference element and sample element containing a radioactive material is measured via a Wheatstone bridge arrangement of thermistors. The bridge is driven with an alternating current on a pulsed basis to maintain the thermal floor of the calorimeter at a low reference value. A lock-in amplifier connected to the bridge phase locks a signal from the bridge to the input pulsed AC signal to provide a DC voltage. The DC voltage is sampled over time and provided to a digital computer. The digital computer, using curve fitting algorithms, will derive a function for the sample data. From the function, an equilibrium value for the temperature may be calculated. 7 figures.

Donohoue, T.P.; Oertel, C.P.; Tyree, W.H.; Valdez, J.L.

1991-11-26

162

Custom integrated front-end circuit for the CMS electromagnetic calorimeter  

Microsoft Academic Search

A wide dynamic range multigain transimpedance amplifier custom integrated circuit has been developed for the readout of avalanche photodiode and vacuum phototriode in the CMS electromagnetic calorimeter for the Large Hadron Collider experiment. The 92 dB input dynamic range is divided into four ranges of 12 bits each in order to provide 40 MHz analog sampled data to a 12

J. P. Walder; J. M. Bussat; P. Denes; H. Mathez; P. Pangaud

2001-01-01

163

Implementation of a serial protocol for the liquid argon calorimeters of the ATLAS detector  

Microsoft Academic Search

This article presents the status of a serial protocol developed in the framework of ATLAS, a high energy physics experiment that will be installed at the Large Hadron Collider (LHC) based at CERN. This link will be used to control the front-end electronics of the liquid argon calorimeters, located in a radiated environment. After a technical description of the communication

F. Hubaut; B. Laforge; O. Le Dortz; D. Martin; Ph. Schwemling

2000-01-01

164

The limited streamer tubes system for the SLD warm iron calorimeter  

SciTech Connect

The SLD detector at the Stanford Linear Accelerator Center is a general purpose device for studying e{sup +}{epsilon}{sup {minus}} interaction at the Z{sup 0}. The SLD calorimeter system consists of two parts: a lead Liquid Argon Calorimeter (LAC) with both electromagnetic (22 radiation lengths) and hadronic sections (2.8 absorption lengths) housed inside the coil, and the Warm Ion limited streamer tubes Calorimeter (WIC) outside the coil which uses as radiator the iron of the flux return for the magnetic field. The WIC completes the measurement of the hadronic shower energy ({approximately}85% on average is contained in the LAC) and it provides identification and tracking for muons over 99% of the solid angle. In this note we report on the construction, test and commissioning of such a large system.

Benvenuti, A.C. (Istituto Nazionale di Fisica Nucleare, Bologna (Italy)); Camanzi, B.; Piemontese, L.; Zucchelli, P. (Istituto Nazionale di Fisica Nucleare, Ferrara (Italy) Ferrara Univ. (Italy)); Calcaterra, A.; De Sangro, R.; De Simone, P.; De Simone, S.; Gallinaro, M.; Peruzzi, I.; Piccolo, M. (Istituto Nazionale di Fisica Nucleare, Frascati (Italy). Lab. Nazionale di Frascati); Burrows, P.N.; Busza, W.

1992-01-01

165

Mini-bomb combustion calorimeter  

Microsoft Academic Search

Three mini-bomb calorimeters of different types have been built with the common characteristics: 5cm3 of bomb volume, 10mg of sample, ?420JK?1 of energy equivalent. These calorimeters can be calibrated by the electric method with the standard deviation of the mean of 0.02%. The results of burning reference material — benzoic acid (BA39i) by using the calorimeters 2 and 3 are

An Xu-wu; He Jun

2000-01-01

166

DSWA calorimeter bomb experiments  

SciTech Connect

Two experiments were performed in which 25 grams of TNT were detonated inside an expended detonation calorimeter bomb. The bomb had a contained volume of approximately 5.28 liters. In the first experiment, the bomb was charged with 3 atmospheres of nitrogen. In the second, it was charged with 2.58 atmospheres (23.1 psi gage) of oxygen. In each experiment pressure was monitored over a period of approximately 1200 microseconds after the pulse to the CDU. Monitoring was performed via two 10,000 psi 102AO3 PCB high frequency pressure transducers mounted symmetrically in the lid of the calorimeter bomb. Conditioners used were PCB 482As. The signals from the transducers were recorded in digital format on a multi channel Tektronix scope. The sampling frequency was 10 Mhz (10 samples per microsecond). After a period of cooling following detonation, gas samples were taken and were subsequently submitted for analysis using gas mass spectrometry. Due to a late request for post shot measurement, it was only possible to make a rough estimate of the weight of debris (carbon) remaining in the calorimeter bomb following the second experiment.

Cunningham, B

1998-10-01

167

The ZEUS calorimeter first level trigger  

NASA Astrophysics Data System (ADS)

The design of the ZEUS Calorimeter First Level Trigger (CFLT) is presented. The CFLT utilizes a pipelined architecture to provide trigger data for a Global First Level Trigger decision 5 ?s after each beam crossing, occurring every 96 ns. The charges from 13 K phototubes are summed into 1792 trigger tower pulseheights which are digitized by flash ADCs. The digital values are linearized, stored and used for sums and pattern tests. Summary data is forwarded to the Global First Level Trigger for each crossing 2 ?s after the crossing occurred. The CFLT determines the total energy, the total transverse energy, the missing energy, and the energy and number of isolated electrons and muons. It also provides information on the electromagnetic and hadronic energy deposited in various regions of the calorimeter. The CFLT has kept the experimental trigger rate below ~ 200 Hz at the highest luminosity experienced at HERA. Performance studies suggest that the CFLT will keep the trigger rate below 1 kHz against a rate of proton-beam gas interactions on the order of the 100 kHz expected at design luminosity.

Smith, W. H.; Ali, I.; Behrens, B.; Fordham, C.; Foudas, C.; Goussiou, A.; Jaworski, M.; Kinnel, T.; Lackey, J.; Robl, P.; Silverstein, S.; Dawson, J. W.; Krakauer, D. A.; Talaga, R. L.; Schlereth, J. L.

1995-02-01

168

The scintillating optical fiber calorimeter (SOFCAL) instrument  

NASA Astrophysics Data System (ADS)

A hybrid detector system is being developed for measuring the cosmic ray elemental composition and energy spectra above approximately GeV/nucleon. This system employs both a conventional 'passive' emulsion chamber and an 'active' ionization calorimeter incorporating scintillating fibers. Emulsion chambers have a proton energy threshold approximately greater than 5 TeV for detectable dark spots in the x-ray films which are used as a visual 'trigger.' The central element of this hybrid system is a calorimeter which has 10 x-y hodoscopic layers of 0.5 mm scintillating fibers interspersed with 4 mm lead plates. The fibers sample the hadronic and electromagnetic showers (cascades) initiated by interactions in the overlying emulsion chamber. The cascades are recorded by two image-intensified charge-coupled device (CCD) cameras which view the ends of the fibers to present orthogonal views. These showers are located and traced with microscopes in the emulsion chamber to provide an energy calibration through standard emulsion chamber methods, and an independent confirmation of the primary particle's charge (which is also measured with a Cerenkov counter above the emulsion chamber). The hybrid system will be used this fall for a balloon-borne measurement of the cosmic ray proton and helium spectra from approximately 400 GeV/n to approximately 10 TeV/n. An 8-hour test flight was performed in September 1995. Details of the detector system and sample results from the test flight are presented.

Christl, Mark J.; Fountain, W. F.; Parnell, Thomas A.; Roberts, F. E.; Benson, C.; Berry, Fred A.; Gregory, J. C.; Takahashi, Yoshiyuki

1996-10-01

169

Study of the response of the ATLAS central calorimeter to pions of energies from 3 to 9 GeV  

NASA Astrophysics Data System (ADS)

A fully instrumented slice of the ATLAS central detector was exposed to test beams from the SPS (Super Proton Synchrotron) at CERN in 2004. In this paper, the response of the central calorimeters to pions with energies in the range between 3 and 9 GeV is presented. The linearity and the resolution of the combined calorimetry (electromagnetic and hadronic calorimeters) was measured and compared to the prediction of a detector simulation program using the toolkit Geant 4.

Abat, E.; Abdallah, J. M.; Addy, T. N.; Adragna, P.; Aharrouche, M.; Ahmad, A.; Akesson, T. P. A.; Aleksa, M.; Alexa, C.; Anderson, K.; Anghinolfi, F.; Antonaki, A.; Arabidze, G.; Arik, E.; Baker, O. K.; Banfi, D.; Baron, S.; Beck, H. P.; Belhorma, B.; Benchekroun, D.; Benjamin, D. P.; Benslama, K.; Bergeaas Kuutmann, E.; Bertelsen, H.; Binet, S.; Biscarat, C.; Boldea, V.; Bondarenko, V. G.; Boonekamp, M.; Bosman, M.; Bourdarios, C.; Burckhart Chromek, D.; Bychkov, V.; Callahan, J.; Calvet, D.; Canneri, M.; Capeáns Garrido, M.; Caprini, M.; Cardiel Sas, L.; Carli, T.; Carminati, L.; Carvalho, J.; Cascella, M.; Castillo, M. V.; Catinaccio, A.; Cavalli Sforza, M.; Cavalli, D.; Cavasinni, V.; Cetin, S. A.; Chen, H.; Cherkaoui, R.; Chevallier, F.; Ciobotaru, M.; Citterio, M.; Cleland, B.; Cogneras, E.; Conde Muino, P.; Consonni, M.; Constantinescu, S.; Cornelissen, T.; Corso Radu, A.; Costa, G.; Cwetanski, P.; da Silva, D.; Dam, M.; Danielsson, H. O.; Dannheim, D.; Davidek, T.; de, K.; Defay, P. O.; Dekhissi, B.; Del Peso, J.; Delmastro, M.; Del Prete, T.; Derue, F.; di Ciaccio, L.; di Girolamo, B.; Dita, S.; Dittus, F.; Djama, F.; Djobava, T.; Dobson, M.; Dolgoshein, B. A.; Dotti, A.; Drake, G.; Dressnandt, N.; Driouchi, C.; Ebenstein, W. L.; Eerola, P.; Efthymiopoulos, I.; Egorov, K.; Eifert, T. F.; El Kacimi, M.; Etienvre, A. I.; Fabich, A.; Fakhr-Edine, A. I.; Fanti, M.; Farbin, A.; Farthouat, P.; Fassouliotis, D.; Fayard, L.; Febbraro, R.; Fedin, O. L.; Fenyuk, A.; Ferrari, R.; Ferreira, B. C.; Ferrer, A.; Filippini, G.; Fournier, D.; Francavilla, P.; Francis, D.; Froeschl, R.; Froidevaux, D.; Fullana, E.; Gadomski, S.; Gagnon, P.; Gameiro, S.; Garcia, R.; Ghodbane, N.; Giakoumopoulou, V.; Giangiobbe, V.; Giokaris, N.; Glonti, G.; Gollub, N.; Gomes, A.; Gomez, M. D.; Gorini, B.; Goujdami, D.; Grahn, K. J.; Grenier, P.; Grigalashvili, N.; Grishkevich, Y.; Gruwe, M.; Guicheney, C.; Gupta, A.; Haeberli, C.; Hajduk, Z.; Hakobyan, H.; Hance, M.; Hansen, P. H.; Harvey, A.; Henriques Correia, A.; Hervas, L.; Higon, E.; Hoffman, J.; Hostachy, J. Y.; Hruska, I.; Hubaut, F.; Hulsbergen, W.; Hurwitz, M.; Iconomidou-Fayard, L.; Jen-La Plante, I.; Johansson, P. D. C.; Jon-And, K.; Joos, M.; Jorgensen, S.; Kaczmarska, A.; Kado, M.; Karyukhin, A.; Kataoka, M.; Kayumov, F.; Kazarov, A.; Keener, P. T.; Kekelidze, G. D.; Kerschen, N.; Khoriauli, G.; Khramov, E.; Khristachev, A.; Khubua, J.; Kittelmann, T. H.; Klinkby, E.; Koffas, T.; Kolos, S.; Konovalov, S. P.; Kopikov, S.; Korolkov, I.; Kovalenko, S.; Kowalski, T. Z.; Krüger, K.; Kramarenko, V.; Kudin, L. G.; Kulchitsky, Y.; Lafaye, R.; Laforge, B.; Lampl, W.; Lanni, F.; Laplace, S.; Le Bihan, A. C.; Lechowski, M.; Ledroit-Guillon, F.; Lehmann, G.; Leitner, R.; Lelas, D.; Liang, Z.; Liang, Z.; Lichard, P.; Lokajicek, M.; Louchard, L.; Loureiro, K.; Lucotte, A.; Luehring, F.; Lundberg, B.; Lund-Jensen, B.; Ma, H.; Mackeprang, R.; Maio, A.; Maleev, V. P.; Malek, F.; Maneira, J.; Mandelli, L.; Mazzanti, M.; Manousakis, A.; Mapelli, L.; Marques, C.; Martin, F.; Mazzanti, M.; McFarlane, K. W.; McHedlidze, G.; McPherson, R.; Meirosu, C.; Meng, Z.; Miagkov, A.; Mialkovski, V.; Milstead, D.; Minashvili, I.; Mindur, B.; Mitsou, V. A.; Monnier, E.; Morozov, S. V.; Mosidze, M.; Mouraviev, S. V.; Munar, A.; Nadtochi, A. V.; Negri, A.; Nemecek, S.; Nessi, M.; Nesterov, S. Y.; Newcomer, F. M.; Nikitine, I.; Nikolic-Audit, I.; Ogren, H.; Oh, S. H.; Oleshko, S. B.; Olszowska, J.; Onofre, A.; Padilla Aranda, C.; Paganis, S.; Pallin, D.; Pantea, D.; Paolone, V.; Parsons, J.; Pasqualucci, E.; Passmore, M. S.; Patrichev, S.; Peez, M.; Perez Reale, V.; Perini, L.; Peshekhonov, V. D.; Petersen, J.; Petersen, T. C.; Petti, R.; Pilcher, J.; Pina, J.; Pinto, B.; Podlyski, F.; Poggioli, L.; Poveda, J.; Pralavorio, P.; Pribyl, L.; Price, M. J.; Prieur, D.; Puigdengoles, C.; Puzo, P.; Rajagopalan, S.; Rembser, C.; Ridel, M.; Riu, I.; Roda, C.; Rohne, O.; Romaniouk, A.; Rousseau, D.; Ruiz, A.; Rusakovich, N.; Rust, D.; Ryabov, Y. F.; Ryjov, V.; Salto, O.; Salvachua, B.; Santamarina Rios, C.; Santoni, C.; Saraiva, J. G.; Sarri, F.; Sauvage, G.; Says, L. P.; Schaefer, M.; Schegelsky, V. A.; Schlager, G.; Schlereth, J.; Schmitt, C.; Schwemling, P.; Schwindling, J.; Seixas, J. M.; Seliverstov, D. M.; Serin, L.; Shalanda, N.; Shin, T.; Shmeleva, A.; Silva, J.; Simion, S.; Simonyan, M.; Sloper, J. E.; Smirnov, S. Yu.; Smirnova, L.; Solans, C.; Solodkov, A.; Solovianov, O.; Soloviev, I.; Sosnovtsev, V. V.; Spanò, F.; Speckmeyer, P.; Stancu, S.; Stanek, R.; Starchenko, E.; Straessner, A.; Suchkov, S. I.; Suk, M.; Szczygiel, R. R.; Tarrade, F.; Tartarelli, F.; Tas, P.; Tayalati, Y.; Teuscher, R.; Thioye, M.; Tikhomirov, V. O.; Tisserant, S.; Tremblet, L.; Tsiareshka, P.; Unal, G.

2009-08-01

170

Physics impact of the SDC endcap hadronic cracks  

SciTech Connect

The SDC calorimeter has a set of design requirements. Among them is the need for ``hermeticity.`` The calorimeter should not register particle energies which are so badly mismeasured as to induce a significant missing energy. Such a mismeasure would mimic the existence of a neutrino in the event. The extreme case of a catastrophic mismeasure Of particle energy is the total failure to register the energy of a particle due to its loss in a crack or ``dead`` region of the calorimeter. The baseline design of the SDC endcap calorimeter consists of a crackless, monolithic electromagnetic (EM) compartment, followed by an azimuthal array of 1/16 ``wedge`` hadronic (HAD) modules. Of necessity, tolerances in construction lead to azimuthal cracks between adjacent wedge modules. The purpose of this note is to examine the Physics impact of these cracks, and to examine, in detail, their allowable extent.

Green, D.

1993-04-01

171

Review of high energy hadron-nucleus data  

SciTech Connect

New data on hadron-nucleus interactions are summarized, focusing on: estimation of the rate of energy loss of the incident hadron as it propagates through the target, and determining where the energy is depositied in central hadron-nucleus collisions. The present status of pA ..-->.. p + X inclusive measurements is discussed. Measurements from visual detectors which allow investigation of global event properties are presented. Data taken from calorimeters, where one can trigger and measure transverse energy and energy flow over a given rapidity region, are discussed. 22 refs., 20 figs. (LEW)

Lissauer, D.

1986-01-01

172

Investigation of Geometrical Structures in the Hadronic Shower Core  

NASA Astrophysics Data System (ADS)

The geometrical structure of high-energy hadrons in shower cores measured with the KASCADE calorimeter is analyzed. The angular correlation, esp ecially the degree of alignment, is quantified by means of the commonly used parameter ?4 . The ?4 distribution obtained by KASCADE is comparable to that derived by other experiments. The analysis shows that the observed ?4 distribution is not linked to angular correlations due to jet production at high energies. The dependence on the transverse momentum pt in the simulation of hadronic interactions is marginal. In contrast to ?4 , the maximum distance dmax between the 4 most-energetic hadrons reveals a sensitivity both on pt and the primary mass.

Iwan, A.; Antoni, T.; Apel, W. D.; Badea, F.; Bekk, K.; Bercuci, A.; Blümer, H.; Bozdog, H.; Brancus, I. M.; Büttner, C.; Chilingarian, A.; Duamiller, K.; Doll, P.; Engel, R.; Engler, J.; Feßler, F.; Gils, H. J.; Glasstetter, R.; Haungs, A.; Heck, D.; Hörandel, J. R.; Kampert, K.-H.; Klages, H. O.; Maier, G.; Mathes, H. J.; Mayer, H. J.; Milke, J.; Müller, M.; Obenland, R.; Oehlschläger, J.; Ostapchenko, S.; Petcu, M.; Rebel, H.; Risse, M.; Roth, M.; Schatz, G.; Schieler, H.; Scholz, J.; Thouw, T.; Ulrich, H.; van Buren, J.; Vardanyan, A.; Weindl, A.; Wochele, J.; Zabierowski, J.

2003-07-01

173

The design and construction of a Pb/scintillator sampling calorimeter with wavelength shifter fiber optic readout  

NASA Astrophysics Data System (ADS)

A Pb/scintillator sampling calorimeter covering the pseudorapidity interval of ? = 0.83 to 4.20 has been designed and constructed for Experiment 814 of Brookhaven National Laboratory. The calorimeter uses wavelength shifting optical fibers for readout. Such fibers allow the construction of a highly granular and longitudinally compact device. A novel scheme for coupling a fiber to a scintillator plate has been designed that yields a high photoelectron response. Longitudinally, the calorimeter has a depth of four interaction lengths divided into two electromagnetic sections and two hadronic sections of 0.4, 0.4, 1.6, and 1.6 interaction lengths, respectively.

Simon-Gillo, J.; Farooq, A.; Rawool-Sullivan, M. W.; Ray, A.; Shoemaker, J.; Sullivan, J. P.; Wolf, K. L.; Barasch, E. F.; Boissevain, J. G.; Fox, D.; Gavron, A.; Holzscheiter, K.; Jacak, B. V.; Lopez, T.; Kapustinsky, J.; Sondheim, W.; Sunier, J. W.; van Hecke, H.; Wolf, B.

1991-11-01

174

Tiled++: An Enhanced Tiled Hi-Res Display Wall  

Microsoft Academic Search

In recent years, high-resolution displays have become increasingly important to decision makers and scientists because large screens combined with a high pixel count facilitate content rich, simultaneous display of computer-generated imagery and high-definition video data from multiple sources. Tiled displays are attractive due to their extended screen real estate, scalability, and low cost. LCD panels are usually preferred over projectors

Achim Ebert; Sebastian Thelen; Peter-Scott Olech; Joerg Meyer; Hans Hagen

2010-01-01

175

An Electrically Calibrated Bomb Calorimeter  

Microsoft Academic Search

After a review of the physical foundations of bomb calorimetry, a bomb calorimeter is described which can be heated electrically or by combustion. The evaporation of water is prevented by sealing the vessel completely. Other modifications in the normal technique are introduced after consideration of (a) the difference in temperature between the outer surface of the calorimeter and the thermometer

A. R. Challoner; H. A. Gundry; A. R. Meetham

1955-01-01

176

An automatic adiabatic bomb calorimeter  

Microsoft Academic Search

The paper details the conversion of an existing isothermal bomb calorimeter to an adiabatic calorimeter with automatic control. Thermistors in the inner and outer vessels are included in two arms of an a.c. Wheatstone bridge: any rise in temperature of the inner vessel above that of the outer vessel results in phase reversal of the output voltage from the bridge,

W F Raymond; R J Canaway; C E Harris

1957-01-01

177

An FPGA based backup version of the TileCal digitizer.  

NASA Astrophysics Data System (ADS)

The ATLAS Tile Calorimeter front end digitization and readout system comprises about 1800 digitizer boards with two TileDMU ASICs on each board. The TileDMUs are responsible for storing, derandomising and reading out digitized data from twelve ADCs. An ample number of board spares are available. However, a backup solution is desirable in the event of unexpected failure modes. The original version contains both outdated and custom made circuits that are difficult or impossible to find in sufficient numbers. We have developed a new version using inexpensive off the shelf FPGAs (Spartan 6). The FPGAs have all the necessary functionality to emulate the TileDMU and will be readily available for a considerable time. The new board is functionally compatible with the current version and to a large extent uses the same code. The design goal was to leave the digitizer design as intact as possible since it is well tested and performs well. As radiation tolerance is an issue we have implemented triple mode redundancy in the FPGA. To further improve the system we added in system programmability via TTCrx for both the FPGA and the configuration memory using one way JTAG. This provides a way to recover from radiation damage to the configuration PROM or to remotely upgrade system firmware.

Eriksson, D.; Muschter, S.; Bohm, C.

2010-11-01

178

Geometrical tile design for complex neighborhoods.  

PubMed

Recent research has showed that tile systems are one of the most suitable theoretical frameworks for the spatial study and modeling of self-assembly processes, such as the formation of DNA and protein oligomeric structures. A Wang tile is a unit square, with glues on its edges, attaching to other tiles and forming larger and larger structures. Although quite intuitive, the idea of glues placed on the edges of a tile is not always natural for simulating the interactions occurring in some real systems. For example, when considering protein self-assembly, the shape of a protein is the main determinant of its functions and its interactions with other proteins. Our goal is to use geometric tiles, i.e., square tiles with geometrical protrusions on their edges, for simulating tiled paths (zippers) with complex neighborhoods, by ribbons of geometric tiles with simple, local neighborhoods. This paper is a step toward solving the general case of an arbitrary neighborhood, by proposing geometric tile designs that solve the case of a "tall" von Neumann neighborhood, the case of the f-shaped neighborhood, and the case of a 3 x 5 "filled" rectangular neighborhood. The techniques can be combined and generalized to solve the problem in the case of any neighborhood, centered at the tile of reference, and included in a 3 x (2k + 1) rectangle. PMID:19956398

Czeizler, Eugen; Kari, Lila

2009-11-23

179

Electromagnetic shower properties in a lead-scintillator sampling calorimeter  

NASA Astrophysics Data System (ADS)

The Collider Detector at Fermilab (CDF) is a general-purpose experimental apparatus with an inner tracking detector for measuring charged particles, surrounded by a calorimeter for measurements of electromagnetic and hadronic showers. We describe a GEANT4 simulation and parameterization of the response of the CDF central electromagnetic calorimeter (CEM) to incident electrons and photons. The detector model consists of a detailed description of the CEM geometry and material in the direction of the incident particle's trajectory, and of the passive material between the tracker and the CEM. We use GEANT4 to calculate the distributions of: the energy that leaks from the back of the CEM, the energy fraction sampled by the scintillators, and the energy dependence of the response. We parameterize these distributions to accurately model electron and photon response and resolution in a custom simulation for the measurement of the W boson mass.

Kotwal, Ashutosh V.; Hays, Christopher

2013-11-01

180

Transverse Laplacians for Substitution Tilings  

NASA Astrophysics Data System (ADS)

Pearson and Bellissard recently built a spectral triple - the data of Riemannian noncommutative geometry - for ultrametric Cantor sets. They derived a family of Laplace-Beltrami like operators on those sets. Motivated by the applications to specific examples, we revisit their work for the transversals of tiling spaces, which are particular self-similar Cantor sets. We use Bratteli diagrams to encode the self-similarity, and Cuntz-Krieger algebras to implement it. We show that the abscissa of convergence of the ?-function of the spectral triple gives indications on the exponent of complexity of the tiling. We determine completely the spectrum of the Laplace-Beltrami operators, give an explicit method of calculation for their eigenvalues, compute their Weyl asymptotics, and a Seeley equivalent for their heat kernels.

Julien, Antoine; Savinien, Jean

2011-01-01

181

Low cost photovoltaic roof tile  

Microsoft Academic Search

Static concentrator designs that achieve concentration ratios approaching the theoretical limit have been developed and demonstrated. Concentration ratios in excess of 4:1 have been predicted although this reduces to 3.6:1 for the practical design used for photovoltaic roof tile applications. A new encapsulant based on “solid white oil” has been evaluated for use in the optical cavity, exhibiting excellent optical

S. R. Wenham; S. Bowden; M. Dickinson; R. Largent; N. Shaw; C. B. Honsberg; M. A. Green; P. Smith

1997-01-01

182

Installation and operation of recording calorimeters  

SciTech Connect

The Cutler-Hammer recording calorimeter is illustrated in this paper. This calorimeter measures the total calorific value of combustible gas, and continuously samples, indicates, and records BTU per cubic foot. The paper emphasizes the importance of calorimeter accuracy. It is suggested that the calorimeter manufacturer be consulted for advice and assistance in developing a sound service program for trouble shooting and for service.

Kersey, A.F.

1984-04-01

183

Performance of prototypes for the ALICE electromagnetic calorimeter  

NASA Astrophysics Data System (ADS)

The performance of prototypes for the ALICE electromagnetic sampling calorimeter has been studied in test beam measurements at FNAL and CERN. A 4×4 array of final design modules showed an energy resolution of about 11%/E(GeV)?1.7% with a uniformity of the response to electrons of 1% and a good linearity in the energy range from 10 to 100 GeV. The electromagnetic shower position resolution was found to be described by 1.5mm?5.3mm/E(GeV). For an electron identification efficiency of 90% a hadron rejection factor of >600 was obtained.

Allen, J.; Awes, T.; Badalá, A.; Baumgart, S.; Bellwied, R.; Benhabib, L.; Bernard, C.; Bianchi, N.; Blanco, F.; Bortoli, Y.; Bourdaud, G.; Bourrion, O.; Boyer, B.; Bruna, E.; Butterworth, J.; Caines, H.; Calvo Diaz Aldagalan, D.; Capitani, G. P.; Carcagno, Y.; Casanova Diaz, A.; Cherney, M.; Conesa Balbastre, G.; Cormier, T. M.; Cunqueiro Mendez, L.; Delagrange, H.; Del Franco, M.; Dialinas, M.; di Nezza, P.; Donoghue, A.; Elnimr, M.; Enokizono, A.; Estienne, M.; Faivre, J.; Fantoni, A.; Fichera, F.; Foglio, B.; Fresneau, S.; Fujita, J.; Furget, C.; Gadrat, S.; Garishvili, I.; Germain, M.; Giudice, N.; Gorbunov, Y.; Grimaldi, A.; Guardone, N.; Guernane, R.; Hadjidakis, C.; Hamblen, J.; Harris, J. W.; Hasch, D.; Heinz, M.; Hille, P. T.; Hornback, D.; Ichou, R.; Jacobs, P.; Jangal, S.; Jayananda, K.; Klay, J. L.; Knospe, A. G.; Kox, S.; Kral, J.; Laloux, P.; Lapointe, S.; La Rocca, P.; Lewis, S.; Li, Q.; Librizzi, F.; Madagodahettige Don, D.; Martashvili, I.; Mayes, B.; Milletto, T.; Muccifora, V.; Muller, H.; Muraz, J. F.; Nattrass, C.; Noto, F.; Novitzky, N.; Odyniec, G.; Orlandi, A.; Palmeri, A.; Pappalardo, G. S.; Pavlinov, A.; Pesci, W.; Petrov, V.; Petta, C.; Pichot, P.; Pinsky, L.; Ploskon, M.; Pompei, F.; Pulvirenti, A.; Putschke, J.; Pruneau, C. A.; Rak, J.; Rasson, J.; Read, K. F.; Real, J. S.; Reolon, A. R.; Riggi, F.; Riso, J.; Ronchetti, F.; Roy, C.; Roy, D.; Salemi, M.; Salur, S.; Sharma, M.; Silvermyr, D.; Smirnov, N.; Soltz, R.; Sparti, V.; Stutzmann, J.-S.; Symons, T. J. M.; Tarazona Martinez, A.; Tarini, L.; Thomen, R.; Timmins, A.; van Leeuwen, M.; Vieira, R.; Viticchié, A.; Voloshin, S.; Wang, D.; Wang, Y.; Ward, R. M.; ALICE EMCal Group

2010-03-01

184

The liquid argon calorimeter subsystem  

SciTech Connect

During the past several months, Tennessee, Mississippi, and the Oak Ridge National Laboratory have been coordinating efforts to benchmark the CALOR89 code system against the DO and HELIOS prototype calorimeter data, and to use the CALOR89 system to generate currently needed data for radiation damage studies, signal collection time, and compensation characteristics of various calorimeter designs. This report describes these results and gives our plans and projected budgets for the following year. 8 refs., 5 figs.

Alsmiller, R.G. Jr.; Fu, C.Y.; Gabriel, T.A. (Oak Ridge National Lab., TN (USA)); Handler, T. (Tennessee Univ., Knoxville, TN (USA). Dept. of Physics); Cremaldi, L.; Reidy, J. (Mississippi State Univ., Mississippi State, MS (USA). Dept. of Physics)

1991-01-01

185

The scintillating plate calorimeter subsystem  

SciTech Connect

During the past year, Tennessee, Mississippi, and Oak Ridge National Laboratory have been coordinating efforts to benchmark the CALOR89 code system against the ZEUS prototype calorimeter data, and to use the CALOR89 system to generate currently needed data for radiation damage studies, signal collection time, and compensation characteristics of various calorimeter designs. This report describes these results and gives our plans and projected budgets for the following year. 7 refs., 7 figs., 1 tab.

Handler, T. (Tennessee Univ., Knoxville, TN (USA). Dept. of Physics); Reidy, J.; Cremaldi, L. (Tennessee Univ., Knoxville, TN (USA). Dept. of Physics); Alsmiller, R.G. Jr.; Fu, C.Y.; Gabriel, T.A. (Oak Ridge National Lab., TN (USA))

1991-01-01

186

Thermal Characterization of TPS Tiles  

NASA Astrophysics Data System (ADS)

The Thermal Protection System (TPS) used on space shuttles protects the metallic structure from the large amounts of heat created during travel through the atmosphere, both on takeoff and reentry. The shuttle experiences high thermo-acoustic loading and impact damage from micro-meteorites, which can cause disbonds, delaminations, chips, cracks, and other defects to the TPS system. To enhance durability and damage tolerance, new TPS tiles with an added protective ceramic-matrix-composite layer are being developed. This paper explores the use of pulsed thermography as a quick, diverse, non-destructive technique, to characterize the TPS system. The pulsed thermography images obtained are presented and analyzed.

Kacmar, C. J.; Lacivita, K. J.; Jata, K. V.; Sathish, S.

2006-03-01

187

Process for the production of ceramic tiles  

US Patent & Trademark Office Database

The present invention is directed to an improved process for the production of ceramic tiles using industrial wastes. The invention particularly relates to an improved process for the production of ceramic tiles using industrial wastes such as iron ore slime, fly ash and blast furnace slag.

2004-06-01

188

Smashing: Folding Space to Tile through Time  

Microsoft Academic Search

Partial differential equation solvers spend most of their com- putation time performing nearest neighbor (stencil) computations on grids that model spatial domains. Tiling is an effective performance op- timization for improving the data locality and enabling course-grain par- allelization for such computations. However, when the domains are pe- riodic, tiling through time is not directly applicable due to wrap-around dependencies.

Nissa Osheim; Michelle Mills Strout; Dave Rostron; Sanjay V. Rajopadhye

2008-01-01

189

Automatic tiling of iterative stencil loops  

Microsoft Academic Search

Iterative stencil loops are used in scientific programs to implement relaxation methods for numerical simulation and signal processing. Such loops iteratively modify the same array elements over different time steps, which presents opportunities for the compiler to improve the temporal data locality through loop tiling. This article presents a compiler framework for automatic tiling of iterative stencil loops, with the

Zhiyuan Li; Yonghong Song

2004-01-01

190

Propagation of light in birefringent tilings  

NASA Astrophysics Data System (ADS)

Two-dimensional tilings of an optically birefringent material are proposed as an orientational superlattice for light. The light modes that result from loss-free refraction are analyzed. It is shown that the behavior for light propagation in such lattices leads to totally bound as well as propagating states. The behavior of light propagation in several such tilings is compared.

Mascarenhas, Angelo; Fluegel, Brian; Bhusal, Lekhnath

2008-03-01

191

The design and performance of the electromagnetic calorimeters in Hall C at Jefferson Lab  

NASA Astrophysics Data System (ADS)

The design and performance of the electromagnetic calorimeters in the magnetic spectrometers in Hall C at Jefferson Lab are presented. For the existing HMS and SOS spectrometers, construction information and comparisons of simulated and experimental results are presented. The design and simulated performance for a new calorimeter to be used in the new SHMS spectrometer is also presented. We have developed and constructed electromagnetic calorimeters from TF-1 type lead-glass blocks for the HMS and SOS magnetic spectrometers at JLab Hall C. The HMS/SOS calorimeters are of identical design and construction except for their total size. Blocks of dimension 10 cm × 10 cm × 70 cm are arranged in four planes and stacked 13 and 11 blocks high in the HMS and SOS respectively. The energy resolution of these calorimeters is better than 6%/?E, and pion/electron (?/e) separation of about 100:1 has been achieved in energy range 1-5 GeV. Good agreement has been observed between the experimental and GEANT4 simulated energy resolutions. The HMS/SOS calorimeters have been used nearly in all Hall C experiments, providing good energy resolution and a high pion suppression factor. No significant deterioration in their performance has been observed in the course of use since 1994. For the SHMS spectrometer, presently under construction, details on the calorimeter design and accompanying GEANT4 simulation efforts are given. A Preshower+Shower design was selected as the most cost-effective among several design choices. The preshower will consist of a layer of 28 modules with TF-1 type lead glass radiators, stacked in two columns. The shower part will consist of 224 modules with F-101 type lead glass radiators, stacked in a “fly's eye” configuration of 14 columns and 16 rows. The active area of 120 × 130 cm2 will encompass the beam envelope at the calorimeter. The anticipated performance of the new calorimeter is simulated over the full momentum range of the SHMS, predicting resolution and yields similar to the HMS calorimeter. Good electron/hadron separation can be achieved by using energy deposition in the Preshower along with total energy deposition in the calorimeter. In this case the PID capability is similar to or better than that attainable with HMS calorimeter, with a pion suppression factor of a few hundreds predicted for 99% electron detection efficiency.

Tadevosyan, V.; Mkrtchyan, H.; Asaturyan, A.; Mkrtchyan, A.; Zhamkochyan, S.; the Hall C Collaboration

2012-12-01

192

The design and performance of the electromagnetic calorimeters in Hall C at Jefferson Lab  

SciTech Connect

The design and performance of the electromagnetic calorimeters in the magnetic spectrometers in Hall C at Jefferson Lab are presented. For the existing HMS and SOS spectrometers, construction information and comparisons of simulated and experimental results are presented. The design and simulated performance for a new calorimeter to be used in the new SHMS spectrometer is also presented. We have developed and constructed electromagnetic calorimeters from TF-1 type lead-glass blocks for the HMS and SOS magnetic spectrometers at JLab Hall C. The HMS/SOS calorimeters are of identical design and construction except for their total size. Blocks of dimension 10 cm × 10 cm × 70 cm are arranged in four planes and stacked 13 and 11 blocks high in the HMS and SOS respectively. The energy resolution of these calorimeters is better than 6%/?E, and pion/electron (?/e) separation of about 100:1 has been achieved in energy range 1–5 GeV. Good agreement has been observed between the experimental and GEANT4 simulated energy resolutions. The HMS/SOS calorimeters have been used nearly in all Hall C experiments, providing good energy resolution and a high pion suppression factor. No significant deterioration in their performance has been observed in the course of use since 1994. For the SHMS spectrometer, presently under construction, details on the calorimeter design and accompanying GEANT4 simulation efforts are given. A Preshower+Shower design was selected as the most cost-effective among several design choices. The preshower will consist of a layer of 28 modules with TF-1 type lead glass radiators, stacked in two columns. The shower part will consist of 224 modules with F-101 type lead glass radiators, stacked in a “fly's eye” configuration of 14 columns and 16 rows. The active area of 120 × 130 cm(2) will encompass the beam envelope at the calorimeter. The anticipated performance of the new calorimeter is simulated over the full momentum range of the SHMS, predicting resolution and yields similar to the HMS calorimeter. Good electron/hadron separation can be achieved by using energy deposition in the Preshower along with total energy deposition in the calorimeter. In this case the PID capability is similar to or better than that attainable with HMS calorimeter, with a pion suppression factor of a few hundreds predicted for 99% electron detection efficiency.

Vardan Tadevosyan, Hamlet Mkrtchyan, Arshak Asaturyan, Arthur Mkrtchyan, Simon Zhamkochyan

2012-12-01

193

The CMS barrel calorimeter response to particle beams from 2-GeV/c to 350-GeV/c  

SciTech Connect

The response of the CMS barrel calorimeter (electromagnetic plus hadronic) to hadrons, electrons and muons over a wide momentum range from 2 to 350 GeV/c has been measured. To our knowledge, this is the widest range of momenta in which any calorimeter system has been studied. These tests, carried out at the H2 beam-line at CERN, provide a wealth of information, especially at low energies. The analysis of the differences in calorimeter response to charged pions, kaons, protons and antiprotons and a detailed discussion of the underlying phenomena are presented. We also show techniques that apply corrections to the signals from the considerably different electromagnetic (EB) and hadronic (HB) barrel calorimeters in reconstructing the energies of hadrons. Above 5 GeV/c, these corrections improve the energy resolution of the combined system where the stochastic term equals 84.7 {+-} 1.6% and the constant term is 7.4 {+-} 0.8%. The corrected mean response remains constant within 1.3% rms.

Abdullin, S.; /Moscow, ITEP; Abramov, V.; /Serpukhov, IHEP; Acharya, B.; /Tata Inst.; Adam, N.; /Princeton U.; Adams, M.; /Illinois U., Chicago; Adzic, P.; /Belgrade U.; Akchurin, N.; /Texas Tech.; Akgun, U.; Albayrak, E.; /Iowa U.; Alemany-Fernandez, R.; Almeida, N.; /Lisbon, LIFEP /Democritos Nucl. Res. Ctr. /Virginia U. /Iowa State U.

2009-01-01

194

A first-level calorimeter trigger for the ATLAS experiment  

SciTech Connect

In the RD27 collaboration the authors have carried out system studies on the implementation of the first level calorimeter trigger processor system for the ATLAS experiment to be mounted at the Large Hadron Collider (LHC) at CERN. A demonstrator trigger system operated successfully with the RD3 and RD33 calorimeters at the full 40 MHz LHC bunch crossing (BC) rate. The prototype application-specific integrated circuits (ASICs) in this system each processed data from only a single trigger cell and its environment, which would lead to an extremely large system for ATLAS. Using eight-bit parallel data even the use of ASICs, processing multiple trigger cells would demand unacceptably large numbers of input pins and module connections. Initial studies of this I/O problem produced a solution based on asynchronous transmission of zero-suppressed and BC-tagged data on 160 Mbit/s serial links. This approach appeared to be feasible but would have introduced additional latency of about 20 BCs. Further studies have led to the design of a fully-synchronous calorimeter trigger processor system using commercial high-speed optical links. The links will terminate in multi-chip modules (MCMs) incorporating custom-designed integrated optics, and the trigger algorithms will be implemented in ASICs.

Perera, V.; Edwards, J.; Gee, N. [Rutherford Appleton Lab, Chilton (United Kingdom)] [and others

1995-08-01

195

Upgrade of the cold electronics of the ATLAS HEC calorimeter for sLHC generic studies of radiation hardness and temperature dependence  

Microsoft Academic Search

The front-end electronics (signal amplification and summation) of the ATLAS Hadronic End-cap Calorimeter (HEC) is operated at the circumference of the HEC calorimeter wheels inside the cryostats in liquid argon (LAr). The present electronics is designed to operate at irradiation levels expected for the LHC. For operation at the sLHC the irradiation levels are expected to be a factor ten

H. Oberlack; D. Dannheim; A. Fischer; A. Hambarzumjan; G. Pospelov; O. Reimann; A. Rudert; P. Schacht

2009-01-01

196

Metallic magnetic calorimeters  

SciTech Connect

Metallic magnetic calorimeters (MMC) are calorimetric particle detectors, typically operated at temperatures below 100 mK, that make use of a paramagnetic temperature sensor to transform the temperature rise upon the absorption of a particle in the detector into a measurable magnetic flux change in a dc-SQUID. During the last years a growing number of groups has started to develop MMC for a wide variety of applications, ranging from alpha-, beta- and gamma-spectrometry over the spatially resolved detection of accelerated molecule fragments to arrays of high resolution x-ray detectors. For x-rays with energies up to 6 keV an energy resolution of 2.7 eV (FWHM) has been demonstrated and we expect that this can be pushed below 1 eV with the next generation of devices. We give an introduction to the physics of MMCs and summarize the presently used readout schemes as well as the typically observed noise contributions and their impact on the energy resolution. We discuss general design considerations, the micro-fabrication of MMCs and the performance of micro-fabricated devices. In this field large progress has been achieved in the last years and the thermodynamic properties of most materials approach bulk values allowing for optimal and predictable performance.

Fleischmann, A.; Gastaldo, L.; Kempf, S.; Kirsch, A.; Pabinger, A.; Pies, C.; Porst, J.-P; Ranitzsch, P.; Schaefer, S.; Seggern, F. v.; Wolf, T.; Enss, C. [Universitaet Heidelberg, Kirchhoff-Institut fuer Physik, INF 227, 69120 Heidelberg (Germany); Seidel, G. M. [Department of Physics, Brown University, Box 1843, Providence, RI 02912 (United States)

2009-12-16

197

Hadron physics  

SciTech Connect

Is all hadronic physics ultimately describable by QCD. Certainly, many disparate phenomena can be understood within the QCD framework. Also certainly, there are important questions which are open, both theoretically (little guidance, as yet) and experimentally, regarding confinement. Are there dibaryons, baryonium, glueballs. In addition, there are experimental results which at present do not have an explanation. This talk, after a short section on QCD successes and difficulties, will emphasize two experimental topics which have recent results - glueball spectroscopy and exclusive reactions at large momentum transfer. Both are experimentally accessible in the AGS/LAMPF II/AGS II/TRIUMF II/SIN II energy domain.

Bunce, G.

1984-05-30

198

Statistical mechanics of two dimensional tilings  

NASA Astrophysics Data System (ADS)

Reduced dimensionality in two dimensions is a topic of current interest. We use model systems to investigate the statistical mechanics of ideal networks. The tilings have possible applications such as the 2D locations of pore sites in nanoporous arrays (quantum dots), in the 2D hexagonal structure of graphene, and as adsorbates on quasicrystalline crystal surfaces. We calculate the statistical mechanics of these networks, such as the partition function, free energy, entropy, and enthalpy. The plots of these functions versus the number of links in the finite networks result in power law regression. We also determine the degree distribution, which is a combination of power law and rational function behavior. In the large-scale limit, the degree of these 2D networks approaches 3, 4, and 6, in agreement with the degree of the regular tilings. In comparison, a Penrose tiling has a degree also equal to about 4. Ideal tilings such the regular tilings and Penrose tilings are investigated. The partition function, free energy, entropy, and enthalpy is calculated. The plots of these functions result in power law regression. A Penrose tiling has a degree equal to about 4.

Kaatz, Forrest H.; Estrada, Ernesto; Bultheel, Adhemar; Sharrock, Noel

2012-05-01

199

Local statistics for random domino tilings of the Aztec diamond  

Microsoft Academic Search

We prove an asymptotic formula for the probability that, if one chooses a domino tiling of a large Aztec diamond at random according to the uniform distribution on such tilings, the tiling will contain a domino covering a given pair of adjacent lattice squares. This formula quantifies the effect of the diamond's boundary conditions on the behavior of typical tilings;

Henry Cohn; Noam Elkies; James Propp

2000-01-01

200

High Power, High Sensitivity Microwave Calorimeter.  

National Technical Information Service (NTIS)

A microwave calorimeter is disclosed for substantially measuring the total microwave energy in an applied microwave pulse. The microwave calorimeter includes: a housing having a highly reflective interior surface, a microwave device disposed in the housin...

F. M. Mako J. A. Pasour

1989-01-01

201

5.8 X-ray Calorimeters.  

National Technical Information Service (NTIS)

X-ray calorimeter instruments for astrophysics have seen rapid development since they were invented in 1984. The prime instrument on all currently planned X-ray spectroscopic observatories is based on calorimeter technology. This relatively simple detecti...

F. S. Porter

2008-01-01

202

Compressing random microstructures via stochastic Wang tilings  

NASA Astrophysics Data System (ADS)

This Rapid Communication presents a stochastic Wang tiling-based technique to compress or reconstruct disordered microstructures on the basis of given spatial statistics. Unlike the existing approaches based on a single unit cell, it utilizes a finite set of tiles assembled by a stochastic tiling algorithm, thereby allowing to accurately reproduce long-range orientation orders in a computationally efficient manner. Although the basic features of the method are demonstrated for a two-dimensional particulate suspension, the present framework is fully extensible to generic multidimensional media.

Novák, Jan; Ku?erová, Anna; Zeman, Jan

2012-10-01

203

Mechanical and Thermal Design of the CEBAF Hall A Beam Calorimeter  

Microsoft Academic Search

A calorimeter is being fabricated to provide 0.5% - 1.0% absolute measurement of the beam current in the Hall A end station of the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLAB). Modern powder metallurgy processes have produced high density, high thermal conductivity tungsten-copper composite materials that minimize electromagnetic and hadronic energy loss while maintaining a rapid thermal

M. Bevins; A. Day; P. Degtiarenko; L. A. Dillon-Townes; A. Freyberger; R. Gilman; A. Saha; S. Slachtouski

2005-01-01

204

Progress in Hadronic Physics Modelling in Geant4  

SciTech Connect

Geant4 offers a set of models to simulate hadronic showers in calorimeters. Recent improvements to several models relevant to the modelling of hadronic showers are discussed. These include improved cross sections, a revision of the FTF model, the addition of quasi-elastic scattering to the QGS model, and enhancements in the nuclear precompound and de-excitation models. The validation of physics models against thin target experiments has been extended especially in the energy region 10 GeV and below. Examples of new validation results are shown.

Apostolakis, John; /CERN; Folger, Gunter; /CERN; Grichine, Vladimir; /CERN; Heikkinen, Aatos; /Helsinki Inst. of Phys.; Howard, Alexander; /CERN; Ivanchenko, Vladimir; /CERN; Kaitaniemi, Pekka; /Helsinki Inst. of Phys.; Koi, Tatsumi; /SLAC; Kosov, Mikhail; /CERN /Moscow, ITEP; Quesada, Jose Manuel; /Seville U.; Ribon, Alberto; /CERN; Uzhinsky, Vladimir; /CERN; Wright, Dennis; /SLAC

2011-11-28

205

Development of GEM-based Digital Hadron Calorimetry using the SLAC KPiX chip  

NASA Astrophysics Data System (ADS)

The development of Digital Hadron Calorimetry for the SiD detector Concept for the International Linear Collider is described. The jet energy requirements of the ILC physics program are discussed. The concept of GEM-based digital hadron calorimetry is presented, followed by a description of, and results from, prototype detectors. Plans are described for the construction of 1m2 GEM-DHCAL planes to be tested as part of a future calorimeter stack.

White, A.

2010-01-01

206

Development of GEM-Based Digital Hadron Calorimetry Using the SLAC KPiX Chip  

SciTech Connect

The development of Digital Hadron Calorimetry for the SiD detector Concept for the International Linear Collider is described. The jet energy requirements of the ILC physics program are discussed. The concept of GEM-based digital hadron calorimetry is presented, followed by a description of, and results from, prototype detectors. Plans are described for the construction of 1m{sup 2} GEM-DHCAL planes to be tested as part of a future calorimeter stack.

White, A.; /Texas U., Arlington /Washington U., Seattle /Unlisted /SLAC

2012-04-12

207

Radioactivity in zircon and building tiles  

SciTech Connect

Zircon (ZrSiO{sub 4}) is commonly used in The manufacture of glazed tiles. In this study we found high concentrations of the radionuclides {sup 226}Ra, {sup 232}tH, {sup 40}k in zircon sand. The average radium equivalent (A{sub Ra} + 1.26 A{sub Th} + 0.086 A{sub k}) in zircon sand is 17,500 Bq kg{sup -1}, which is 106 times as much as that in ordinary building materials. The external radiation ({gamma} + {beta}) dose rates from 1.1 to 4.9 x 10{sup -2} mGy h{sup -1} with an average of 2.1 x 10{sup -2} mGy h{sup -1}. Although no elevated {gamma}-ray radiation or radon exhalation rate was detected in rooms decorated with glazed tiles, which is characteristic of combined {alpha}, {beta} and {gamma} emitting thin materials, the average {gamma} radiation dose rate at the surface of the tile stacks in shops is 1.5 times as much as the indoor background level. The average area density of total {beta} emitting radionuclides in glazed floor tiles and glazed wall tiles is 0.30 Bq cm{sup -2} and 0.28 Bq cm{sup -2}, respectively. It was estimated that the average {beta} dose rates in tissue at a depth 7 mg cm{sup -2} with a distance 20-100 cm from the floor tiles were 3.2 to 0.9 x 10{sup -7} Gy h{sup -1}. The study indicates that the {beta}-rays from glazed tiles might be one of the main factors leading to an increase in ionizing radiation received by the general public. Workers in glazed tile manufacturing factories and in tile shops or stores may be exposed to elevated levels of both {beta}-rays and {gamma}-rays from zircon sand or glazed tile stacks. No elevated radiation from unglazed tiles was detected. 10 refs., 1 fig., 3 tabs.

Wen Deng; Kaizhen Tian; Daifu Chen [Sichuan Institute of Labor Hygiene, Chendu (China); Yiyun Zhang [Sichuan United Univ., Chengdu (China)

1997-08-01

208

The Pinwheel Tilings of the Plane  

Microsoft Academic Search

this paper, and many long hours of discussions with DaniBerend.2 CHARLES RADINmeans "disordered" in the probabilistic sense used to study patterns in nonlineardynamics. Within the field of logic, there was a brief line of developmentin which "very complicated" means "nonrecursive".All published examples, of finite sets of prototiles which can only tile theplane nonperiodically, have the feature that in every tiling

Charles Radin

1994-01-01

209

The isoperimetric problem for pinwheel tilings  

Microsoft Academic Search

In aperiodic “pinwheel” tilings of the plane there exist unions of tiles with ratio (area)\\/(perimeter)2 arbitrarily close to that of a circle. Such approximate circles can be constructed with arbitrary center and any sufficiently large radius. The existence of such circles follows from the metric on pinwheel space being almost Euclidean at large distances; ifP andQ are points separated by

Charles Radin; Lorenzo Sadun

1996-01-01

210

The Tile Complexity of Linear Assemblies  

Microsoft Academic Search

Self-assembly is fundamental to both biological processes and nanoscience. Key features of self-assembly are its probabilistic nature and local programmability. These features can be leveraged to design better self-assembled systems. The conventional Tile Assembly Model (TAM) developed by Winfree using Wang tiles is a powerful, Turing-universal theoretical framework which models varied self-assembly processes. A particular challenge in DNA nanoscience is

Harish Chandran; Nikhil Gopalkrishnan; John H. Reif

2009-01-01

211

Picture Languages Generated by Assembling Tiles  

Microsoft Academic Search

We propose a new formalism for generating picture languages based on an assembly mechanism of tiles that uses rules having\\u000a a context and a replacement site. More precisely, a picture language will be generated from a finite set of initial pictures\\u000a by iteratively applying rewriting rules from a given finite set of rules, called a tiling rule system (TRuS system).

Paola Bonizzoni; Claudio Ferretti; Anthonath Roslin Sagaya Mary; Giancarlo Mauri

2009-01-01

212

The Complexity of Domino Tiling Problems  

Microsoft Academic Search

Abstract In this paper, we give a combinatorial formalization that describes a wide range of related problems in the theory of tiling derived from the popular game of dominos. We show that determining if a given finite region of the plane can be tiled with a given set of dominos,is NP-Complete. The new graph theoretical methods,we introduce allow this result

Don Sheehy

213

A parallel algorithm for tiling problems  

Microsoft Academic Search

A parallel algorithm for tiling with polyominoes is presented. The tiling problem is to pack polyominoes in a finite checkerboard. The algorithm using l×m×n processing elements requires O(1) time, where l is the number of different kinds of polyominoes on an m×n checkerboard. The algorithm can be used for placement of components or cells in a very large-scale integrated circuit

Y. Takefuji; Y.-C. Lee

1990-01-01

214

ZEUS calorimeter first level trigger.  

National Technical Information Service (NTIS)

The design of the ZEUS Calorimeter First Level Trigger (CFLT) is presented. The CFLT utilizes a pipelined architecture to provide trigger data for a global first leel trigger decision 5 (mu)sec after each beam crossing, occurring every 96 nsec. The charge...

W. H. Smith I. Ali B. Behrens C. Fordham C. Foudas

1994-01-01

215

Measurement of the time development of particle showers in a uranium scintillator calorimeter  

NASA Astrophysics Data System (ADS)

We report on the time evolution of particle showers, as measured in modules of the uranium-scintillator barrel calorimeter of the ZEUS detector. The time development of hadronic showers differs significantly from that of electromagnetic showers, with about 40% of the response to hadronic showers arising from energy depositions which occur late in the shower development. The degree of compensation and the hadronic energy resolution were measured as a function of integration time, giving a value of e/? = 1.02 +/- 0.01 for a gate width of 100 ns. The possibilities for electron-hadron separation based on the time structure of the shower were studied, with pion rejection factors in excess of 100 being achieved for electron efficiencies greater than 60%. The custom electronics used to perform these measurements samples the calorimeter signal at close to 60 MHz, stores all samples for a period of over 4 ?s using analog switched capacitor pipelines, and digitizes the samples for triggered events with 12-bit ADCs.

Caldwell, A.; Hervás, L.; Parsons, J. A.; Sciulli, F.; Sippach, W.; Wai, L.

1993-06-01

216

Hadron Freeze-out and QGP Hadronization  

Microsoft Academic Search

Abundances and $m_\\\\bot$-spectra of strange and other hadronic particles emanating from central 158-200 A GeV reactions between nuclei are found to originate from a thermally equilibrated, deconfined source in chemical non-equilibrium. Physical freeze-out parameters and physical conditions (pressure, specific energy, entropy, and strangeness) are evaluated. Five properties of the source we obtain are as expected for direct hadron emission (hadronization)

Johann Rafelski; Jean Letessier

1999-01-01

217

AIRBORNE ASBESTOS CONCENTRATIONS DURING BUFFING OF RESILIENT FLOOR TILE  

EPA Science Inventory

Although asbestos-containing resilient floor tiles are considered nonfriable, the frictional forces exerted on the tile during routine maintenance operations can generate asbestos-containing structures. tudy was conducted to determine the level of airborne asbestos concentrations...

218

Timing resolution of ``Shisk-Kebab`` lead scintillator sandwich calorimeters  

SciTech Connect

We have constructed lead scintillator sandwich calorimeters with 1/4 {chi}{sub o} sampling frequency and total thickness {approximately}16{chi}{sub o}. The 4 mm thick scintillator plates are read out by wavelength shifter fibers 1 mm in diameter which pass through holes penetrating the plates on a .95 cm {times} .95 cm grid (Shish-Kebab geometry). We tested these modules in the A2 test beam at Brookhaven using low energy electrons and hadrons. Results are here presented on electron energy and time-of-flight resolution obtained with various combinations of scintillators and wavelength shifters. We also describe results on e/{pi} separation obtained with a new technique for the longitudinal segmentation.

Kistenev, E.; White, S. [Brookhaven National Lab., Upton, NY (United States); Pischalnikov, Y.; Protopopov, Y.; Rykalin, V. [Institut Fiziki Vysokikh Ehnergij, Protvino (Russian Federation)

1992-12-31

219

Timing resolution of Shisk-Kebab'' lead scintillator sandwich calorimeters  

SciTech Connect

We have constructed lead scintillator sandwich calorimeters with 1/4 [chi][sub o] sampling frequency and total thickness [approximately]16[chi][sub o]. The 4 mm thick scintillator plates are read out by wavelength shifter fibers 1 mm in diameter which pass through holes penetrating the plates on a .95 cm [times] .95 cm grid (Shish-Kebab geometry). We tested these modules in the A2 test beam at Brookhaven using low energy electrons and hadrons. Results are here presented on electron energy and time-of-flight resolution obtained with various combinations of scintillators and wavelength shifters. We also describe results on e/[pi] separation obtained with a new technique for the longitudinal segmentation.

Kistenev, E.; White, S. (Brookhaven National Lab., Upton, NY (United States)); Pischalnikov, Y.; Protopopov, Y.; Rykalin, V. (Institut Fiziki Vysokikh Ehnergij, Protvino (Russian Federation))

1992-01-01

220

Crosslinking in viral capsids via tiling theory.  

PubMed

A vital part of a virus is its protein shell, called the viral capsid, that encapsulates and hence protects the viral genome. It has been shown in Twarock [2004. A tiling approach to vius capsids assembly explaining a structural puzzle in virology. J. Theor. Biol. 226, 477-482] that the surface structures of viruses with icosahedrally symmetric capsids can be modelled in terms of tilings that encode the locations of the protein subunits. This theory is extended here to multi-level tilings in order to model crosslinking structures. The new framework is demonstrated for the case of bacteriophage HK97, and it is shown, how the theory can be used in general to decide if crosslinking, and what type of crosslinking, is compatible from a mathematical point of view with the geometrical surface structure of a virus. PMID:16337970

Twarock, R; Hendrix, R W

2005-12-09

221

Antenna Tiles for the Murchison Widefield Array  

NASA Astrophysics Data System (ADS)

The Murchison Widefield Array (MWA) will, when completed, employ 512 antenna "tiles" for radio astronomical observations at 80-300 MHz in a radio-quiet zone in Western Australia. Each tile consists of two major sub-systems: (1) 16 dual-polarization, active dipole elements arranged in a 4x4 array over a conductive groundscreen, and (2) an analog beamformer that creates a single beam on the sky from the 16 dipole signals of each polarization. In the initial phase of MWA construction, 32 tiles have been installed at the MWA site, and they are being used in a variety of electronic, environmental, and radio astronomical tests and observations. We will present some of the results of these tests and of complementary laboratory tests, antenna range measurements, and electromagnetic simulations. We will also discuss the novel design features and installation methods developed to reduce the costs of hardware, installation, and maintenance.

Corey, Brian E.; Bowman, J.; Burns, S.; Kratzenberg, E.; Rogers, A.; Wayth, R.; Williams, C.

2009-01-01

222

Intercalibration of the ZEUS high resolution and backing calorimeters.  

National Technical Information Service (NTIS)

We have studied the combined performance of two calorimeters, the high resolution uranium-scintillator prototype of the ZEUS forward calorimeter (FCAL), followed by a prototype of the coarser ZEUS backing calorimeter (BAC), made out of thick iron plates i...

H. Abramowicz H. Czyrkowski A. Derlicki M. Krzyzanowski I. Kudla

1991-01-01

223

The SND calorimeter first level trigger  

Microsoft Academic Search

The first-level trigger (FLT) of the 1632 channel NaI(Tl) scintillation calorimeter of the SND detector at the VEPP-2M collider is described. The FLT utilizes signals from individual calorimeter towers to check the event topology for particular combinations of hit towers with certain distances between towers, number of clusters and their sizes in different parts of the SND calorimeter. The pipeline

D. A Bukin; T. V. Dimova; V. P Druzhinin; V. B Golubev; A. V. Gritsan; Yu. V. Usov; Yu. S Velikzhanin

1996-01-01

224

An elevated temperature titration calorimeter  

NASA Astrophysics Data System (ADS)

A variable-temperature (313 K to 353 K) titration calorimeter of high sensitivity has been constructed. The purpose of the calorimeter is to study temperature effects on the enthalpies of complex formation and of other reactions of metal cations such as hydrolysis and precipitation. Operation of the calorimetric system, including that final calculation of the heat released during titration, is automatic via computer control. Calibration tests of the calorimeter using 2-amino 2-hydroxymethyl 1,3-propanediol gave -(46.0 +/- 0.3) kJ/mol and -(46.2 +/- 0.2) kJ/mol for the enthalpy of protonation, at 318 K and at 343 K, respectively. For titrations of 2-bis(2-hydroxyethyl) amino 2-hydroxymethyl 1,3-propanediol, enthalpy of protonation values of -(28.4 +/- 0.3) kJ/mol and -(29.3 +/- 0.2) kJ/mol were obtained at 318 K and at 343 K, respectively.

Smith, J. R.; Zanonato, P. L.; Choppin, G. R.

1991-06-01

225

An elevated temperature titration calorimeter  

SciTech Connect

A variable-temperature (313 K to 353 K) titration calorimeter of high sensitivity has been constructed. The purpose of the calorimeter is to study temperature effects on the enthalpies of complex formation and of other reactions of metal cations such as hydrolysis and precipitation. Operation of the calorimetric system, including that final calculation of the heat released during titration, is automatic via computer control. Calibration tests of the calorimeter using 2-amino-2-hydroxymethyl-1,3-propanediol gave -(46.0 {plus minus} 0.3) kJ mol{sup {minus}1} and -(46.2 {plus minus} 0.2) kJ mol{sup {minus}1} for the enthalpy of protonation, at 318 K and at 343 K, respectively. For titrations of 2-bis(2-hydroxyethyl) amino-2-hydroxymethyl-1,3-propanediol, enthalpy of protonation values of -(28.4 {plus minus} 0.3) kJ mol{sup {minus}1} and -(29.3 {plus minus} 0.2) kJ mol{sup {minus}1} were obtained at 318 K and at 343 K, respectively. 6 refs., 3 figs., 2 tabs.

Smith, J.R.; Zanonato, P.L.; Choppin, G.R. (Florida State Univ., Tallahassee, FL (USA). Dept. of Chemistry)

1991-06-01

226

Modular robotic tiles: experiments for children with autism  

Microsoft Academic Search

We developed a modular robotic tile and a system composed of a number of these modular robotic tiles. The system composed\\u000a of the modular robotic tiles engages the user in physical activities, e.g., physiotherapy, sports, fitness, and entertainment.\\u000a The modular robotic tiles motivate the user to perform physical activities by providing immediate feedback based upon their\\u000a physical interaction with the

Henrik Hautop Lund; Martin Dam Pedersen; Richard Beck

2009-01-01

227

Collisions and their Catenations: Ultimately Periodic Tilings of the Plane  

Microsoft Academic Search

Motivated by the study of cellular automata algorithmic and dynamics, we investigate an extension of ultimately periodic words\\u000a to two-dimensional infinite words: collisions. A natural composition operation on tilings leads to a catenation operation\\u000a on collisions. By existence of aperiodic tile sets, ultimately periodic tilings of the plane cannot generate all possible\\u000a tilings but exhibit some useful properties of their

Nicolas Ollinger; Gaétan Richard

2008-01-01

228

The Electromagnetic Calorimeter of the BTeV Experiment  

NASA Astrophysics Data System (ADS)

BTeV is a new dedicated B-physics project at Fermilab. It requires excellent photon detection which is crucial to study CP violations in B decays and rare decays of B's to explore physics beyond the standard model. Electromagnetic calorimeter (EMCAL) built of lead tungstate (PbWO4) scintillating crystals can provide excellent energy and position resolution, compact shower size, fast signal, and reasonable radiation hardness. We have carried out beam studies of a prototype of the BTeV electromagnetic calorimeter. The test took place at the Institute for High Energy Physics, Protvino, Russia. The prototype was built of 25 PbWO4 crystals, from russian and chinese manufacturers. The results of the first set of measurements have confirmed the expected good energy and position resolution of the prototype, though revealed the fact that PbWO4 was not as radiation hard as expected when irradiated with intense high energy hadron and electron beams. The next step included additional studies of radiation hardness, methods of monitoring changes of crystal signal due to radiation using LEDs with different wavelength, and possible procedures for testing PbWO4 radiation hardness without high energy beams.

Batarin, V. A.; Butler, J.; Derevschikov, A. A.; Goncharenko, Y. M.; Grishin, V. N.; Kachanov, V. A.; Khodyrev, V. Y.; Konstantinov, A. S.; Kravtsov, V. I.; Kubota, Y.; Matulenko, Y. A.; Melnick, Y. M.; Meschanin, A. P.; Mikhalin, N. E.; Minaev, N. G.; Mochalov, V. V.; Morozov, D. A.; Nogach, L. V.; Ryazantsev, A. V.; Semenov, P. A.; Shestermanov, K. E.; Soloviev, L. F.; Stone, S.; Uzunian, A. V.; Vasiliev, A. N.; Yakutin, A. E.; Yarba, J.

2006-01-01

229

QCD in hadron-hadron collisions  

SciTech Connect

Quantum Chromodynamics provides a good description of many aspects of high energy hadron-hadron collisions, and this will be described, along with some aspects that are not yet understood in QCD. Topics include high E{sub T} jet production, direct photon, W, Z and heavy flavor production, rapidity gaps and hard diffraction.

Albrow, M.

1997-03-01

230

Dynamical implications of Viral Tiling Theory.  

PubMed

The Caspar-Klug classification of viruses whose protein shell, called viral capsid, exhibits icosahedral symmetry, has recently been extended to incorporate viruses whose capsid proteins are exclusively organised in pentamers. The approach, named 'Viral Tiling Theory', is inspired by the theory of quasicrystals, where aperiodic Penrose tilings enjoy 5-fold and 10-fold local symmetries. This paper analyses the extent to which this classification approach informs dynamical properties of the viral capsids, in particular the pattern of Raman active modes of vibrations, which can be observed experimentally. PMID:18353372

ElSawy, K M; Taormina, A; Twarock, R; Vaughan, L

2008-02-13

231

Production and characterization of glazed tiles containing incinerated sewage sludge.  

PubMed

In this article, glaze with different colorants was applied to tile specimens manufactured by incinerated sewage sludge ash (ISSA) and clay. Improvements using different amounts of colorants, and glaze components and concentrations on tile bodies were investigated. Four different proportions of clay (by weight ratio) were replaced by ISSA. Tiles of size 12 cm x 6 cm x 1 cm were made and left in an electric furnace to make biscuit tiles at 800 degrees C. Afterwards, four colorants, Fe2O3 (red), V2O5 (yellow), CoCO3 (blue), and MnO2 (purple), and four different glaze concentrations were applied on biscuit tile specimens. These specimens were later sintered into glazed tiles at 1050 degrees C. The study shows that replacement of clay by sludge ash had adverse effects on properties of tiles. Water absorption increased and bending strength reduced with increased amounts of ash. However, both water absorption and bending strength improved for glazed ash tiles. Abrasion of grazed tiles reduced noticeably from 0.001 to 0.002 g. This implies glaze can enhance abrasion resistance of tiles. Effects like lightfastness and acid-alkali resistance improved as different glazes were applied on tiles. In general, red glazed tiles showed the most stable performance, followed by blue, yellow, and purple. PMID:17433656

Lin, D F; Chang, W C; Yuan, C; Luo, H L

2007-04-11

232

90. TILES OF THE NEW WORLD PANEL, NORTH WALL OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

90. TILES OF THE NEW WORLD PANEL, NORTH WALL OF THE INDIAN HOUSE. THE RELIEF BROCADE TILES ILLUSTRATE SCENES OF NATIVE AMERICAN HISTORY AND CULTURE, AND THE EARLY EUROPEAN EXPLORATION OF THE NEW WORLD. SAME VIEW AS PA-107-21. - Moravian Pottery & Tile Works, Southwest side of State Route 313 (Swamp Road), Northwest of East Court Street, Doylestown, Bucks County, PA

233

21. TILES OF THE NEW WORLD PANEL, NORTH WALL OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

21. TILES OF THE NEW WORLD PANEL, NORTH WALL OF THE INDIAN HOUSE. THE RELIEF BROCADE TILES ILLUSTRATE SCENES OF NATIVE AMERICAN HISTORY AND CULTURE, AND THE EARLY EUROPEAN EXPLORATION OF THE NEW WORLD. - Moravian Pottery & Tile Works, Southwest side of State Route 313 (Swamp Road), Northwest of East Court Street, Doylestown, Bucks County, PA

234

Activatable Tiles: Compact, Robust Programmable Assembly and Other Applications  

Microsoft Academic Search

While algorithmic DNA self-assembly is, in theory, capable of forming complex patterns, its experimental demonstration has been limited by significant assembly errors. In this paper we describe a novel protection\\/deprotection strategy to strictly enforce the direction of tiling assembly growth to ensure the robustness of the assembly process. Tiles are initially inactive, meaning that each tile's output pads are protected

Urmi Majumder; Thomas H. Labean; John H. Reif

2007-01-01

235

Nondeterministic polynomial time factoring in the tile assembly model  

Microsoft Academic Search

Formalized study of self-assembly has led to the definition of the tile assembly model, Previously I presented ways to compute arithmetic functions, such as addition and multiplication, in the tile assembly model: a highly distributed parallel model of computation that may be implemented using molecules or a large computer network such as the Internet. Here, I present tile assembly model

Yuriy Brun

2008-01-01

236

Influence of firing temperature on mechanical properties on roofing tiles  

Microsoft Academic Search

In the ceramic roofing tile manufacturing, absence of good mechanical properties, such as strength and hardness, leads to reject production of both green and fired tiles. We evaluated the effects of firing temperatures on bending strength and Vickers hardness in fired ceramic roofing tiles from kaolinite and illite-carbonate clay materials. The separately designed ceramics samples were shaped by dry pressing

Leposava Sidjanin; Jonjaua Ranogajec; Dragan Rajnovic; Elvira Molnar

2007-01-01

237

Spaces of Tilings, Finite Telescopic Approximations and Gap-Labeling  

Microsoft Academic Search

The continuous Hull of a repetitive tiling T in ?d with the Finite Pattern Condition (FPC) inherits a minimal ?d-lamination structure with flat leaves and a transversal which is a Cantor set. This class of tiling includes the Penrose & the Amman Benkker ones in 2D, as well as the icosahedral tilings in 3D. We show that the continuous Hull,

Jean Bellissard; Riccardo Benedetti; Jean-Marc Gambaudo

2006-01-01

238

Communication-Minimal Tiling of Uniform Dependence Loops  

Microsoft Academic Search

. Tiling is a loop transformation that a compiler uses to create automatically blockedalgorithms in order to improve the benefits of the memory hierarchy and reduce the communicationoverhead between processors. Motivated by existing results, this paper presents a conceptuallysimple approach to finding tilings with a minimal amount of communication between tiles. Thedevelopment of almost all results is based primarily on

Jingling Xue

1996-01-01

239

DeskAlign: Automaticlly Aligning a Tiled Windows Desktop  

Microsoft Academic Search

Tiled projector arrays are effective at meeting the needs for scalable, cost effective, higher resolution displays. In- creases in PC performance have allowed small tiled dis- plays to be driven from a single PC with multiple graphics cards. In this paper we present a system for automatically aligning the Windows Desktop of a tiled display. This sys- tem consists of

Grant Wallace; Han Chen; Kai Li

240

WATER TABLE LEVEL AS INFLUENCED BY TILING METHOD  

Technology Transfer Automated Retrieval System (TEKTRAN)

Sections of the research farm were tiled in the fall of 1979. The primary reason for the tiling was to provide a good soil environment for large tillage trial plots that had been previously established. This was also used as an opportunity to install a comparison of tile installation with a conven...

241

Fundamentals of scalable high-resolution seamlessly tiled projection system  

Microsoft Academic Search

A seamlessly tiled projection system is composed of multiple projectors, a front or rear projection screen, feedback elements, and tiled image processors. Its seamlessness is achieved through the optical and electronic calibrations. The optical calibration in the components of projectors improves the contrast ratio, brightness, and the overall image quality. The electronic calibration aligns the tiled images, and blends the

Chung-Jen Chen; Michael J. Johnson

2001-01-01

242

Hadron physics at LEP  

SciTech Connect

Recent contributions from LEP to the field of hadron spectroscopy are reviewed. Important results have come from three distinct classes of physics processes: inclusive meson and baryon production in hadronic Z{sup 0} decay; hadronic systems in {tau} lepton decay; and resonance formation in untagged {gamma}{gamma} collisions.

Lafferty, George D. [Department of Physics and Astronomy, University of Manchester, Manchester, M13 9PL (United Kingdom)

1998-05-29

243

A simulation study for a Forward Calorimeter upgrade plan in ALICE at LHC  

NASA Astrophysics Data System (ADS)

We plan to install a Forward Calorimeter(FoCAL) in ?=1 4 region of the ALICE experiment at LHC. A main subject is the search for signatures of small-x parton saturation effects, which is recently discussed from the point of Color Glass Condensate(CGC). It also enables to study long range hadron correlations like ``Ridge'' found in the AuAu collision at RHIC. The basic measurements are 0? and direct ? spectrums in p+p, p+A, and A+A collisions. Since two ? from a high momentum 0? decays are merged into a same cluster, 0?/? separation at high momentum is a challenging task. The measurement of single electron from heavy quarks and W boson is also possible in p+p,p+A collisions. A SiW Tracking Calorimeter can be the solution to theses requirements. It is a sampling calorimeter which measures a presice lateral and longitudinal shower shape by a set of silicon sensors. A tungsten is a good choice for absorber material because of its short radiation length and excellent ratio of radiation and absorption lengths. A simulation study for possible physics will be presented. And then the conceputual design of FpCal and its performance study by a GEANT simulation and a beamtest of PHENIX Forward Calorimeter protoype will be also presented.

Hori, Yasuto; Gunji, Taku; Hamagaki, Hideki; Lak, Jan; Seto, Richard; Kistenev, Edwrd; Chiu, Mickey; Vale, Carle; Sukhanov, Andrey

2009-10-01

244

Morphometry and structure of natural random tilings  

NASA Astrophysics Data System (ADS)

To better understand the observed universality of their structure, we analyze the morphometry of a sizable set of living and inanimate planar cellular partitions including patterns seen in animal and plant tissues as well as in magnetic froths and geological formations. We characterize them by the distributions of polygon reduced area, a scale-free measure of the roundedness of polygons. The distributions extracted from experimental images are all fairly sharp and seem to belong to the same family. By comparing the frequencies of the polygon classes, we map the samples onto maximal-entropy model tilings of equal-area, equal-perimeter polygons [1]. We argue that the random two-dimensional patterns studied can be parametrized solely by their median reduced areas. The biological, mechanical, thermodynamical, or other processes which mold the cellular partitions are essential as generators of a certain preferred tile reduced area but beyond that, the structure of a tiling seems to be independent of its material existence. [1] A. Hocevar and P. Ziherl, Degenerate polygonal tilings in simple animal tissues, Phys. Rev. E 80, 011904 (2009).

Ziherl, Primoz; Hocevar, Ana; El Shawish, Samir

2010-03-01

245

The Big Bang singularity and Penrose tilings  

Microsoft Academic Search

We show that there exist striking similarities between the space of Penrose's tilings and relativistic space-times with malicious singularities (regarded as b-boundaries). By exploring these similarities we try to gain an insight into the breaking down of the space-time structure in the malicious singularity of the Big Bang type.

M. Heller; W. Sasin

2003-01-01

246

Instruction scheduling for a tiled dataflow architecture  

Microsoft Academic Search

This paper explores hierarchical instruction scheduling for a tiled processor. Our results show that at the top level of the hierarchy, a simple profile-driven algorithm effectively minimizes operand latency. After this schedule has been partitioned into large sections, the bottom-level algorithm must more carefully analyze program structure when producing the final schedule. Our analysis reveals that at this bottom level,

Martha Mercaldi; Steven Swanson; Andrew Petersen; Andrew Putnam; Andrew Schwerin; Mark Oskin; Susan J. Eggers

2006-01-01

247

Crosslinking in viral capsids via tiling theory  

Microsoft Academic Search

A vital part of a virus is its protein shell, called the viral capsid, that encapsulates and hence protects the viral genome. It has been shown in Twarock [2004. A tiling approach to vius capsids assembly explaining a structural puzzle in virology. J. Theor. Biol. 226, 477–482] that the surface structures of viruses with icosahedrally symmetric capsids can be modelled

R. Twarock; R. W. Hendrix

2006-01-01

248

Penrose tilings, quasi-crystals, and wavelets  

Microsoft Academic Search

The analysis of oriented features in images requires 2D directional wavelets, for instance in standard tasks such as edge detection or directional filtering. In addition we present here a new application, namely a technique for determining all the (statistical) symmetries of a given pattern with respect to rotations and dilations. Examples are Penrose tilings, mathematical quasicrystals or various quasiperiodic planar

Jean-Pierre Antoine; Laurent Jacques; Pierre Vandergheynst

1999-01-01

249

Nucleosome positioning from tiling microarray data  

Microsoft Academic Search

Motivation: The packaging of DNA around nucleosomes in eukaryotic cells plays a crucial role in regulation of gene expression, and other DNA-related processes. To better understand the regulatory role of nucleosomes, it is important to pinpoint their position in a high (5-10 bp) resolution. Toward this end, several recent works used dense tiling arrays to map nucleosomes in a high-

Moran Yassour; Tommy Kaplan; Ariel Jaimovich; Nir Friedman

2008-01-01

250

Optimized color gamuts for tiled displays  

Microsoft Academic Search

We consider the problem of finding a large color space that can be generated by all units in multi-projector tiled display systems. Viewing the problem geometrically as one of finding a large parallelepiped within the intersection of multiple parallelepipeds, and using colorimetric principles to define a volume-based objective function for comparing feasible solutions, we develop an algorithm for finding the

Marshall W. Bern; David Eppstein

2003-01-01

251

Cross-and-Turn Tile Patterns.  

ERIC Educational Resources Information Center

Presents three sets of polygons marked so that visually appealing designs emerge when the polygons are assembled into tessellations that cover the plane. Provides ideas for using the different sets of tiles in the classroom and reactions of the students who assembled the patterns. (AIM)

Clason, Robert G.; And Others

1997-01-01

252

Tile-based Level of Detail for the Parallel Age  

SciTech Connect

Today's PCs incorporate multiple CPUs and GPUs and are easily arranged in clusters for high-performance, interactive graphics. We present an approach based on hierarchical, screen-space tiles to parallelizing rendering with level of detail. Adapt tiles, render tiles, and machine tiles are associated with CPUs, GPUs, and PCs, respectively, to efficiently parallelize the workload with good resource utilization. Adaptive tile sizes provide load balancing while our level of detail system allows total and independent management of the load on CPUs and GPUs. We demonstrate our approach on parallel configurations consisting of both single PCs and a cluster of PCs.

Niski, K; Cohen, J D

2007-08-15

253

Fundamentals of scalable high-resolution seamlessly tiled projection system  

NASA Astrophysics Data System (ADS)

A seamlessly tiled projection system is composed of multiple projectors, a front or rear projection screen, feedback elements, and tiled image processors. Its seamlessness is achieved through the optical and electronic calibrations. The optical calibration in the components of projectors improves the contrast ratio, brightness, and the overall image quality. The electronic calibration aligns the tiled images, and blends the color between adjacent tiles using a camera feedback system. A front projection system with a 2 X 2 array of SXGA (1280 X 1024) projectors is set up to describe the fundamentals of achieving a scalable, high- resolution, seamlessly tiled projection display.

Chen, Chung-Jen; Johnson, Michael J.

2001-03-01

254

Identifying primitives for a calorimeter trigger  

Microsoft Academic Search

Studies on how to utilize the information from a finely segmented calorimeter in a trigger system have a significant impact on the overall trigger design. The GEM (Gammas, Electrons, Muons) detector at the Superconducting Super Collider will utilize calorimeter information in all levels of its trigger. Algorithms are being developed to provide local and global triggers. Identifying which primitives are

C. Allen; J. L. Ritchie; D. R. Marlow

1992-01-01

255

The H 1 liquid argon calorimeter system  

Microsoft Academic Search

The liquid argon calorimeter of the H 1 detector presently taking data at the HERA ep collider at DESY, Hamburg, is described. The main physics requirements and the most salient design features relevant to this calorimeter are given. The aim to have smooth and hermetic calorimetric coverage over the polar angular range 4° <= theta <= 154° is achieved by

B. Andrieu; A. Babayev; J. Bán; E. Banas; E. Barrelet; U. Bassler; D. Bederede; R. Bernard; G. Bernardi; R. Bernier; M. Besançon; J.-C. Biasci; E. Binder; F. Blouzon; H. Blume; K. Borras; V. Boudry; F. Brasse; D. Breton; H. Brettel; V. Brisson; D. Bruncko; U. Buchner; A. Busata; G. Buschhorn; A. J. Campbell; T. Carli; F. Charles; R. Chase; M. Colombo; Ch. Coutures; A. Coville; G. Cozzika; J. Cvach; M. Danilov; M. David; J. David; B. Delcourt; L. del Buono; F. Descamps; M. Devel; A. Deroeck; P. Dingus; K. Djidi; A. Drescher; U. Dretzler; M. Drewe; J. Duboc; F. Dupont; V. Efremenko; F. Eisele; G. Ernst; G. Falley; R. Fang; J. Feltesse; Z. Y. Feng; J. Fent; J. Ferencei; W. Flauger; G. Flügge; J. Formánek; W. Fröchtenicht; K. Gamerdinger; J. Gayler; I. Giesgen; J. Godlewski; L. Goerlich; M. Goldberg; P. Goritchev; L. Gosset; R. Grässler; C. Gregory; H. Greif; G. Grindhammer; M. Haguenauer; L. Hajduk; O. Hamon; P. Hartz; R. Haydar; I. Herynek; W. Hildesheim; J. Hladký; J. Huber; N. Huot; J.-F. Huppert; D. Imbault; M.-A. Jabiol; A. Jacholkowska; M. Jaffré; J. Jeanjean; H. Jung; C. Kiesling; M. Kolander; H. Kolanoski; J. Koll; V. Korbel; M. Korn; W. Krasny; M. Kubantsev; J.-P. Kubenka; H. Küster; M. Kuhlen; T. Kurca; J. Kurzhöfer; J.-F. Laporte; H. Laskus; M. Lemler; U. Lenhardt; P. Loch; D. Lüers; E. Malinovski; J. Marks; F. Martin; J. Martyniak; T. Merz; S. Mikocki; E. Monnier; B. Montés; P. Murín; V. Nagovizin; P. Nayman; A. Nepeipivo; H. K. Nguyen; H. Novakova; G. Nowak; H. Oberlack; U. Obrock; P. Pailler; J.-Y. Parey; C. Pascaud; P. Perrodo; S. Peters; J.-P. Pharabod; W. Pimpl; K. Rauschnabel; A. Reboux; P. Reimer; P. Ribarics; M. Rietz; M. Rudowicz; S. Rusakov; V. Rusinov; K. Rybicki; N. Sahlmann; M. Savitsky; P. Sawallisch; P. Schacht; W. Schmitz; H. Schmücker; M. Seman; V. Shekelyan; I. Sheviakov; Y. Sirois; P. Smirnov; J. Spalek; J. Staeck; P. Staroba; P. Stefan; H. Steiner; J. Stier; J. Strachota; K. Thiele; I. Tichomirov; W. Tribanek; V. Tschernyshov; M. Turiot; J. Turnau; L. Urban; M. Urban; S. Valkar; A. Valkarova; C. Vallée; M. Vecko; P. Verrecchia; G. Villet; D. Wegener; P. Weissbach; H.-P. Wellisch; T. P. Yiou; J. Ácek; P. Závada; Ch. Zeitnitz; F. Zomer

1993-01-01

256

(Participation in the L* calorimeter working group)  

Microsoft Academic Search

The traveler participated in the L* calorimeter working group held at CERN, Geneva, Switzerland, March 25--28, 1990. Significant progress was made toward defining the calorimeter options to be featured in the L* expression of interest (EOI). The traveler participated in the L* working group on triggers and data acquisition held in Rome, Italy, March 28--31, 1990. This area of the

Plasil

1990-01-01

257

Rad Hard Active Media For Calorimeters  

Microsoft Academic Search

Zero-degree calorimeters have limited space and extreme levels of radiation. A simple, low cost, radiation hard design uses tungsten metal as the absorber and a suitable liquid as the Cerenkov radiator. In other applications a PPAC (Parallel Plate Avalanche Counter) operating with a suitable atmospheric-pressure gas is an attractive active material for a calorimeter. It can be made radiation hard

E. Norbeck; J. E. Olson; A. Moeller; Y. Onel

2006-01-01

258

Temperature Effects in the ATIC BGO Calorimeter  

Microsoft Academic Search

The Advanced Thin Ionization Calorimeter ATIC Balloon Experiment contains a segmented calorimeter composed of 320 individual BGO crystals 18 radiation lengths deep to determine the particle energy Like all inorganic scintillation crystals the light output of BGO depends not only on the energy deposited by particles but also on the temperature of the crystal ATIC had successful flights in 2000

J. Isbert; J. P. Wefel

2006-01-01

259

The Soudan 2 honeycomb calorimeter  

NASA Astrophysics Data System (ADS)

Soudan 2 is an 1100-ton honeycomb tracking calorimeter which is being constructed to search for nucleon decay. The detector consists of finely segmented iron instrumented with long drift tubes, and records three spatial coordinates and dE/dx for every gas crossing. Excellent event reconstruction capability, particle identification and muon sign and direction determination give superior rejection of the neutrino background to nucleon decay in many modes. The first 620 tons of Soudan 2 are now in steady operation, with completion planned for 1992. Detector performance has been studied using cosmic ray tracks and a charged test beam calibration. Results on detector performance and detector response are described.

Garcia-Garcia, C.

1990-12-01

260

Endcap Calorimeter/Vessel Calculations  

SciTech Connect

The end cap calorimeters's cryostate is composed of two vessels; one nested inside the other. Figure 1 shows a simplified sketch of the nested vessels. Drawings 3740.220-MD-222076 Rev. A shows the details of the inner vessel. Drawing 3740.220-MD-222075 Rev. A shows the details of the outer vessel. As shown in figure 1, the cryostate consists of ten different geometric parts. The parts labeled 1-4 are cylindrical shells, the parts labeled 5 and 6 are common torispherical heads and the parts labeled 7-10 are unique heads.

Krempetz, K.; /Fermilab

1986-01-01

261

Performance of a combined uranium/tetramethylpentane calorimeter with different sampling fractions  

NASA Astrophysics Data System (ADS)

The uranium/tetramethylpentane calorimeter, developed for the UA1 experiment, was used to study different calorimeter configurations in a test beam. The results on the performance of modules with different sampling fractions combined in a single setup is presented. To sum the contributions from these modules the determination of the relative calibration constants is crucial. This was done using several methods. The results are discussed with special emphasis on the resolution for hadrons and the ratio of the electron to pion response. For the UA1 Collaboration: Aachen - Amsterdam (NIKHEF) - Annecy (LAPP) - Birmingham - Boston - CERN - Helsinki - Kiel - Imperial College, London - Queen Mary Westfield College, London - Madrid (CIEMAT) - MIT - Padua - Paris (College de France) Rome - Rutherford Appleton Lab - Saclay (CEN)- UCLA - Vienna Collaboration.

Krammer, M.

1992-05-01

262

Single crystalline LuAG fibers for homogeneous dual-readout calorimeters  

NASA Astrophysics Data System (ADS)

For the next generation of calorimeters, designed to improve the energy resolution of hadrons and jets measurements, there is a need for highly granular detectors requiring peculiar geometries. Heavy inorganic scintillators allow compact homogeneous calorimeter designs with excellent energy resolution and dual-readout abilities. These scintillators are however not usually suited for geometries with a high aspect ratio because of the important losses observed during the light propagation. Elongated single crystals (fibers) of Lutetium Aluminium garnet (LuAG, Lu3Al5O12) were successfully grown with the micropulling-down technique. We present here the results obtained with the recent fiber production and we discuss how the light propagation could be enhanced to reach attenuation lengths in the fibers better than 0.5 m.

Pauwels, K.; Dujardin, C.; Gundacker, S.; Lebbou, K.; Lecoq, P.; Lucchini, M.; Moretti, F.; Petrosyan, A. G.; Xu, X.; Auffray, E.

2013-09-01

263

Status and preliminary performance with cosmic data of the warm iron calorimeter in SLD  

SciTech Connect

The SLD is an e{sup +}e{sup {minus}} detector optimized for Z{sup 0} physics, and is approaching completion at the Stanford Linear Accelerator Center (SLAC). The Warm Iron Calorimeter (WIC) is a device built using limited streamer tubes to instrument the magnet yoke, and has double purpose: it will measure the energy of tails of hadronic showers escaping from the Liquid Argon Calorimeter (the main instrument of SLD calorimetry) and the coil, and it will also be used as a muon identifier and tracker. The design choices, construction details, and expected performance have already been described elsewhere. In this note, we report on the present status of the WIC, and show some preliminary results obtained from cosmic ray data. 8 refs., 6 figs.

Not Available

1990-11-01

264

The ATLAS Level-1 Calorimeter Trigger: PreProcessor implementation and performance  

NASA Astrophysics Data System (ADS)

The PreProcessor system of the ATLAS Level-1 Calorimeter Trigger (L1Calo) receives about 7200 analogue signals from the electromagnetic and hadronic components of the calorimetric detector system. Lateral division results in cells which are pre-summed to so-called Trigger Towers of size 0.1 × 0.1 along azimuth (phi) and pseudorapidity (?). The received calorimeter signals represent deposits of transverse energy. The system consists of 124 individual PreProcessor modules that digitise the input signals for each LHC collision, and provide energy and timing information to the digital processors of the L1Calo system, which identify physics objects forming much of the basis for the full ATLAS first level trigger decision. This paper describes the architecture of the PreProcessor, its hardware realisation, functionality, and performance.

Åsman, B.; Achenbach, R.; Allbrooke, B. M. M.; Anders, G.; Andrei, V.; Büscher, V.; Bansil, H. S.; Barnett, B. M.; Bauss, B.; Bendtz, K.; Bohm, C.; Bracinik, J.; Brawn, I. P.; Brock, R.; Buttinger, W.; Caputo, R.; Caughron, S.; Cerrito, L.; Charlton, D. G.; Childers, J. T.; Curtis, C. J.; Daniells, A. C.; Davis, A. O.; Davygora, Y.; Dorn, M.; Eckweiler, S.; Edmunds, D.; Edwards, J. P.; Eisenhandler, E.; Ellis, K.; Ermoline, Y.; Föhlisch, F.; Faulkner, P. J. W.; Fedorko, W.; Fleckner, J.; French, S. T.; Gee, C. N. P.; Gillman, A. R.; Goeringer, C.; Hülsing, T.; Hadley, D. R.; Hanke, P.; Hauser, R.; Heim, S.; Hellman, S.; Hickling, R. S.; Hidvégi, A.; Hillier, S. J.; Hofmann, J. I.; Hristova, I.; Ji, W.; Johansen, M.; Keller, M.; Khomich, A.; Kluge, E.-E.; Koll, J.; Laier, H.; Landon, M. P. J.; Lang, V. S.; Laurens, P.; Lepold, F.; Lilley, J. N.; Linnemann, J. T.; Müller, F.; Müller, T.; Mahboubi, K.; Martin, T. A.; Mass, A.; Meier, K.; Meyer, C.; Middleton, R. P.; Moa, T.; Moritz, S.; Morris, J. D.; Mudd, R. D.; Narayan, R.; zur Nedden, M.; Neusiedl, A.; Newman, P. R.; Nikiforov, A.; Ohm, C. C.; Perera, V. J. O.; Pfeiffer, U.; Plucinski, P.; Poddar, S.; Prieur, D. P. F.; Qian, W.; Rieck, P.; Rizvi, E.; Sankey, D. P. C.; Schäfer, U.; Scharf, V.; Schmitt, K.; Schröder, C.; Schultz-Coulon, H.-C.; Schumacher, C.; Schwienhorst, R.; Silverstein, S. B.; Simioni, E.; Snidero, G.; Staley, R. J.; Stamen, R.; Stock, P.; Stockton, M. C.; Tan, C. L. A.; Tapprogge, S.; Thomas, J. P.; Thompson, P. D.; Thomson, M.; True, P.; Watkins, P. M.; Watson, A. T.; Watson, M. F.; Weber, P.; Wessels, M.; Wiglesworth, C.; Williams, S. L.

2012-12-01

265

Recent developments in tile/fiber calorimetry  

NASA Astrophysics Data System (ADS)

At the '93 Elba Calorimeter Conference, final results on R&D for the CDF plug upgrade were presented. Much new work was also reported on alternate schemes which allow for higher sampling frequency and simple, modular construction. Some highlights in waveshifter fiber developments are presented here with emphasis on differences between the Shish-Kebab and the CDF design.

White, Sebastian

1995-02-01

266

Strange pentaquark hadrons in statistical hadronization  

NASA Astrophysics Data System (ADS)

We study, within the statistical hadronization model, the influence of narrow strangeness carrying baryon resonances (pentaquarks) on the understanding of particle production in relativistic heavy ion collisions. There is a great variation of expected yields as a function of heavy ion collision energy due to rapidly evolving chemical conditions at particle chemical freeze-out. At relatively low collision energies, these new states lead to improvement of statistical hadronization fits.

Letessier, Jean; Torrieri, Giorgio; Steinke, Steve; Rafelski, Johann

2003-12-01

267

An efficient pseudomedian filter for tiling microrrays  

PubMed Central

Background Tiling microarrays are becoming an essential technology in the functional genomics toolbox. They have been applied to the tasks of novel transcript identification, elucidation of transcription factor binding sites, detection of methylated DNA and several other applications in several model organisms. These experiments are being conducted at increasingly finer resolutions as the microarray technology enjoys increasingly greater feature densities. The increased densities naturally lead to increased data analysis requirements. Specifically, the most widely employed algorithm for tiling array analysis involves smoothing observed signals by computing pseudomedians within sliding windows, a O(n2logn) calculation in each window. This poor time complexity is an issue for tiling array analysis and could prove to be a real bottleneck as tiling microarray experiments become grander in scope and finer in resolution. Results We therefore implemented Monahan's HLQEST algorithm that reduces the runtime complexity for computing the pseudomedian of n numbers to O(nlogn) from O(n2logn). For a representative tiling microarray dataset, this modification reduced the smoothing procedure's runtime by nearly 90%. We then leveraged the fact that elements within sliding windows remain largely unchanged in overlapping windows (as one slides across genomic space) to further reduce computation by an additional 43%. This was achieved by the application of skip lists to maintaining a sorted list of values from window to window. This sorted list could be maintained with simple O(log n) inserts and deletes. We illustrate the favorable scaling properties of our algorithms with both time complexity analysis and benchmarking on synthetic datasets. Conclusion Tiling microarray analyses that rely upon a sliding window pseudomedian calculation can require many hours of computation. We have eased this requirement significantly by implementing efficient algorithms that scale well with genomic feature density. This result not only speeds the current standard analyses, but also makes possible ones where many iterations of the filter may be required, such as might be required in a bootstrap or parameter estimation setting. Source code and executables are available at .

Royce, Thomas E; Carriero, Nicholas J; Gerstein, Mark B

2007-01-01

268

Hadron Physics at FAIR  

SciTech Connect

The new FAIR facility in Darmstadt has a broad program in the field of hadron and nuclear physics utilizing ion beams with unprecedented intensity and accuracy. The hadron physics program centers around the the high-energy storage ring HESR for antiprotons and the PANDA experiment that is integrated in it. The physics program includes among others topics like hadron spectroscopy in the charmonium mass region and below, hyperon physics, electromagnetic processes and charm in nuclei.

Wiedner, Ulrich [Institut f. Experimentalphysik I, Ruhr-University Bochum D-44780 Bochum (Germany)

2011-10-24

269

On Some New Properties of Binary Tilings  

NASA Astrophysics Data System (ADS)

We show that one of the binary tilings introduced by Lançon & Billard (LB1) tends asymptotically towards an “universal” random tiling of decagonal symmetry, whatever the starting tiling may be, after an infinite sequence of random decorations preserving the LB1 structural properties; the successive steps of the sequence are described in terms of random substitution matrices. The universal character of the asymptotic tiling reveals in particular in: the existence of a well-defined intensive variable ?_infty which measures the proportion of pairs of nearest neighbors of atoms of different species which belong to pairs o contiguous “fat” tiles F, its very characteristic Fourier transform, and finite size fluctuations. Our results rely on a series of extensive Monte-Carlo simulations and on analytic calculations of the statistics of the tilings (e.g. ?_n) at different stages n of the substitution process. All these calculations concerns the sole entropy properties, which simplification is justified by the well known fact that binary tilings are degenerate for Lennard-Jones interactions between nearest-neighbors. A direct calculation of the entropy yields a value of ?_infty slightly different from the value obtained by the analytic method above, by an amount of ? 1%. We suggest that the difference is due to long-range correlations which are not taken into account in the direct calculation as well as some specific ergodicity properties of our “microcanonical” ensemble of tilings realizations, which reveal for example in the non-abelian properties of the finite size fluctuations, and which remain to be studied in any case. Nous montrons que l'un des pavages binaires de Lançon & Billard (LB1) a une limite asymptotique “universelle”, c'est-à-dire ne dépendant pas du pavage de départ, sous l'effet d'une séquence infinie de substitutions aléatoires (décrites par une matrice de transfert aléatoire) qui préservent son caractère LB1. Le caractère universel du pavage asymptotique se révèle, en particulier par : l'existence d'une variable intensive ?_infty qui mesure le nombre de paires d'atomes de types différents appartenant à des paires de tuiles “épaisses” contiguës F, son spectre de Fourier caractéristique, de symétrie décagonale, ses fluctuations de taille finie. Nos résultats s'appuient sur une série très détaillée de simulations Monte-Carlo et sur des calculs analytiques de la statistique des pavages (par exemple le calcul de ?_n) en fonction du rang n du processus de substitution. Tous ces calculs concernent les seules propriétés entropiques, ce qui se justifie par le fait bien connu que les pavages binaires sont dégénérés pour des interactions Lennard-Jones limitées aux proches voisins. Un calcul direct de l'entropie conduit à une valeur de ?_infty légèrement différente de celle obtenue par la méthode analytique ci-dessus évoquée (? 1%).

Aviram, Ira; Kleman, Maurice

1996-05-01

270

Nondestructive evaluation of hollow clay tile walls  

SciTech Connect

Experiments have been conducted using sonics, ultrasonics, infrared thermography, and microwave NDE techniques on hollow clay tile masonry construction at the Department of Energy Oak Ridge Y-12 Plant in Oak Ridge, Tennessee. The experiments are part of a major test program to evaluate the seismic and wind load capacity of existing hollow clay tile infilled steel frame buildings at the Y-12 Plant and to recommended the extent of retrofit required to ensure these structures will meet the current requirements for natural hazards survival. Many of the techniques that showed promise in bench top experiments proved to be disappointing for in situ evaluations. For the problem definitions specific to the Y-12 Plant test program, at least two NDE techniques continue to justify funding of further development into a useful methodology: infrared thermography and low power microwave spectrography.

Wynn, C.C.; Fletcher, W.M.; Jones, W.D.

1992-03-12

271

Indexing Continual Range Queries with Covering Tiles for Fast Locating of Moving Objects  

Microsoft Academic Search

We present a covering tile-based (COVET) query index for fast locating of moving objects. A set of virtual tiles are predefined, each with a unique ID. One or more of the virtual tiles are used to strictly cover individual range queries. A COVET index maintains a direct mapping between tiles and queries. The use of covering tiles has two important

Kun-lung Wu; Shyh-kwei Chen; Philip S. Yu

2004-01-01

272

Instruction scheduling for a tiled dataflow architecture  

Microsoft Academic Search

This paper explores hierarchical instruction scheduling for a tiled processor. Our results show that at the top level of the hierarchy, a simple profile-driven algorithm effectively minimizes operand latency. After this schedule has been partitioned into large sections, the bottom-level algorithm must more carefully analyze program structure when producing the final schedule.Our analysis reveals that at this bottom level, good

Martha Mercaldi; Steven Swanson; Andrew Petersen; Andrew Putnam; Andrew Schwerin; Mark Oskin; Susan J. Eggers

2006-01-01

273

FITS Tile Compression in the NOAO DMS  

NASA Astrophysics Data System (ADS)

The NOAO Data Management system (DMS) captures data from eleven NOAO and partner telescopes and transports these data from three mountaintops to replicate them between three data centers both North and South of the equator. Image files are annotated, remediated, ingested, and persisted through interfaces of the NOAO Science Archive. Wide-field optical and infrared images flow out of the archive, through the NOAO High Performance Pipeline creating several new data products that flow back into the archive. Raw, pipeline-reduced, and survey data products, both proprietary and post-proprietary, are made available through the NOAO Portal using VO standards and services. Each of these several steps requires access to both image data and metadata in the form of image header keywords. Measures of storage efficiency and throughput characterize performance, cost, schedule, and risk in a matrix across all telescopes and all subsystems. Anything that impedes access to data or metadata diminishes throughput, thus slowing schedules, increasing costs, revealing risks, and adversely affecting performance. The familiar gzip compression algorithm is often used to increase data storage efficiency. However, gzip actually reduces throughput due to initial and recurring overhead of compression and later uncompression. For example, if metadata for an image require remediation, the whole image must be compressed, uncompressed, and compressed again. By contrast, the FITS tile convention using the Rice algorithm achieves about 40% better compression than gzip in just one-third the time. Image headers remain readable such that images often need never be uncompressed at all; metadata can be simply edited in place. Further, a library such as CFITSIO can support tile compression as a native image format. The pixel tiling feature means that for applications such as a cutout service, only the tiles overlapping the desired image section need be uncompressed.

Stobie, E.; Seaman, R.; Barg, I.

2009-09-01

274

Distributed agreement in tile self-assembly  

Microsoft Academic Search

Laboratory investigations have shown that a formal theory of fault-tolerance will be essential to harness nanoscale self-assembly\\u000a as a medium of computation. Several researchers have voiced an intuition that self-assembly phenomena are related to the field\\u000a of distributed computing. This paper formalizes some of that intuition. We construct tile assembly systems that are able to\\u000a simulate the solution of the

Aaron Sterling

2011-01-01

275

Distributed Agreement in Tile Self-Assembly  

Microsoft Academic Search

Laboratory investigations have shown that a formal theory of fault-tolerance will be essen- tial to harness nanoscale self-assembly as a medium of computation. Several researchers have voiced an intuition that self-assembly phenomena are related to the field of distributed computing. This paper formalizes some of that intuition. We construct tile assembly systems that are able to simulate the so- lution

Aaron Sterling

2009-01-01

276

Testing of hollow clay tile masonry prisms  

SciTech Connect

This paper presents test results of 610-mm wide (24-in.) by 1219-mm high (48-in.) by 203-or 330-mm (8- or 13-in.) thick prisms constructed of hollow clay tiles. Three prisms were extracted fro existing hollow clay title walls and 69 were constructed in laboratories at The University of Tennessee and the National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland. Modulus of Elasticity, E, and compressive strength f{prime}{sub m} were calculated from the results.

Jones, W.D.; Butala, M.B.

1993-10-15

277

Penrose tilings, quasi-crystals, and wavelets  

NASA Astrophysics Data System (ADS)

The analysis of oriented features in images requires 2D directional wavelets, for instance in standard tasks such as edge detection or directional filtering. In addition we present here a new application, namely a technique for determining all the (statistical) symmetries of a given pattern with respect to rotations and dilations. Examples are Penrose tilings, mathematical quasicrystals or various quasiperiodic planar point sets or patterns.

Antoine, Jean-Pierre; Jacques, Laurent; Vandergheynst, Pierre

1999-10-01

278

Selecting tile shape for minimal execution time  

Microsoft Academic Search

Many computationally-intensive programs, such as those for differential equations, spatial interpolation, and dynam ic pro- gramming, spend a large portion of their execution time in multiply-nested loops which have a regular stencil of data de- pendences. Tiling is a well-known optimization that improves performance on such loops, particularly for computers with a multi-levelled hierarchy of parallelism and memory. Most previous

Karin Högstedt; Larry Carter; Jeanne Ferrante

1999-01-01

279

MARK II end cap calorimeter electronics  

SciTech Connect

An end cap calorimeter system has been added to the MARK II detector in preparation for its use at the SLAC Linear Collider. The calorimeter uses 8744 rectangular proportional counter tubes. This paper describes the design features of the data acquisition electronics that has been installed on the calorimeter. The design and use of computer-based test stands for the amplification and signal-shaping components is also covered. A portion of the complete system has been tested in a beam at SLAC. In these initial tests, using only the calibration provided by the test stands, a resolution of 18%/..sqrt..E was achieved.

Jared, R.C.; Haggerty, J.S.; Herrup, D.A.; Kirsten, F.A.; Lee, K.L.; Olson, S.R.; Wood, D.R.

1985-10-01

280

First results from the SLD silicon calorimeters  

SciTech Connect

The small-angle calorimeters of the SLD were successfully operated during the recent SLC engineering run. The Luminosity Monitor and Small-Angle Tagger (LMSAT) covers the angular region between 28 and 68 milliradians from the beam axis, while the Medium-Angle Silicon Calorimeter (MASC) covers the 68--190 milliradian region. Both are silicon-tungsten sampling calorimeters; the LMSAT employs 23 layers of 0.86 X{sub 0} sampling, while the MASC has 10 layers of 1.74 X{sub 0} sampling. We present results from the first run of the SLC with the SLD on beamline.

Berridge, S.C.; Bugg, W.M.; Kroeger, R.S.; Weidemann, A.W.; White, S.L. [Tennessee Univ., Knoxville, TN (United States). Dept. of Physics and Astronomy; Brau, J.E.; Frey, R.; Furuno, K.; Huber, J.; Hwang, H.; Park, H.; Pitts, K.T.; Zeitlin, C.J. [Oregon Univ., Eugene, OR (United States). Dept. of Physics; Gioumousis, A.; Haller, G.; Seward, P. [Stanford Linear Accelerator Center, Menlo Park, CA (United States)

1992-07-01

281

Visual registration for robotic operations on space-shuttle tiles  

NASA Astrophysics Data System (ADS)

Refurbishing the thermal-protection tiles on a space shuttle before each mission is a lengthy and labor-intensive process. A mobile robot is being developed to perform two of the required maintenance operations on the bottom side of the shuttle: (1) injection of a hydrophobic fluid, to prevent tiles from absorbing water, and (2) visual inspection, to detect anomalous tile conditions. Both operations depend on precise positioning of the robot end effector with respect to each tile. We describe our method for precise visual registration. The technique first detects the edges of the tile (whose approximate shape and dimensions are given from CAD data) and then uses correspondence between visual features in the postflight and preflight images to improve the registration accuracy. Results on actual tile images are presented.

Decurtins, Jeff; Cowan, Cregg K.

1992-11-01

282

The Soudan 2 honeycomb calorimeter  

SciTech Connect

Soudan 2 is an 1100-ton honeycomb tracking calorimeter which is being constructed to search for nucleon decay. The detector consists of finely segmented iron instrumented with long drift tubes, and records three spatial coordinates and dE/dx for every gas crossing. Excellent event reconstruction capability, particle identification and muon sign and direction determination give superior rejection of the neutrino background to nucleon decay in many modes. The first 620 tons of Soudan 2 are now in steady operation, with completion planned for 1992. Detector performance has been studied using cosmic ray tracks and a charged test beam calibration. Results on detector performance and detector response are described in this paper. 2 refs. , 11 figs.

Garcia-Garcia, C.

1990-12-01

283

Hadron melting and QCD thermodynamics  

NASA Astrophysics Data System (ADS)

We study in this paper mechanisms of hadron melting based on the spectral representation of hadronic quantum channels, and examine the hadron-width dependence of the pressure. The findings are applied to a statistical hadron model of QCD thermodynamics, where hadron masses are distributed by the Hagedorn model and a uniform mechanism for producing hadron widths is assumed. According to this model the hadron–quark-gluon plasma transition occurs at T?200–250MeV, and the numerically observable Tc=156MeV crossover temperature is relevant for the onset of the hadron melting process.

Jakovác, A.

2013-09-01

284

Area-Performance Trade-offs in Tiled Dataflow Architectures  

Microsoft Academic Search

Tiled architectures, such as RAW, SmartMemories, TRIPS, and WaveScalar, promise to address several issues facing conventional processors, including complexity, wire-delay, and performance. The basic premise of these architectures is that larger, higher-performance implementations can be constructed by replicating the basic tile across the chip. This paper explores the area-performance trade-offs when designing one such tiled architecture, WaveScalar. We use a

Steven Swanson; Andrew Putnam; Martha Mercaldi; Ken Michelson; Andrew Petersen; Andrew Schwerin; Mark Oskin; Susan J. Eggers

2006-01-01

285

55. QUARRY TILE CUTTERS, SECOND FLOOR, NORTH WING. WORKERS PRESSED ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

55. QUARRY TILE CUTTERS, SECOND FLOOR, NORTH WING. WORKERS PRESSED THE CUTTERS INTO SLABS OF CLAY, LIFTED THEM ONTO DRYING BOARDS AND PRESSED THE PLUNGERS TO RELEASE THE CUT TILES. REPRODUCTIONS CUTTERS ARE NOT USED IN PRODUCTION. WOODEN FORMS FOR PRODUCING CLAY SLABS WITH ROLLING PINS REST AGAINST THE WALL. - Moravian Pottery & Tile Works, Southwest side of State Route 313 (Swamp Road), Northwest of East Court Street, Doylestown, Bucks County, PA

286

Polyominoes simulating arbitrary-neighborhood zippers and tilings  

Microsoft Academic Search

This paper provides a bridge between the classical tiling theory and the complex-neighborhood self-assembling situations that exist in practice.The neighborhood of a position in the plane is the set of coordinates which are considered adjacent to it. This includes classical neighborhoods of size four, as well as arbitrarily complex neighborhoods. A generalized tile system consists of a set of tiles,

Lila Kari; Benoît Masson

2011-01-01

287

Tiling of canonical cells: large Pa3 approximants  

Microsoft Academic Search

We report the discovery of 5\\/3, 8\\/5 and 13\\/8 periodic approximants to the quasi-periodic tiling of canonical cells with Pa3 (P213) space symmetry. Although the method–Monte Carlo optimization of the density–cannot produce quasi-periodic tiling of canonical cells, the approximants are large enough to demonstrate remarkable properties of the network, appearing as an alternative to the 3D Penrose-tiling-based models of quasi-crystals.

M. Mihalkovic; P. Mrafko

1993-01-01

288

Equilibrium quasicrystal phase of a Penrose tiling model  

Microsoft Academic Search

A two-dimensional rhombus tiling model with a matching-rule-based energy is analyzed using real-space renormalization-group methods and Monte Carlo simulations. The model spans a range from T=0 quasiperiodic crystal (Penrose tiling) to a random-tiling quasicrystal at high temperatures. A heuristic picture for the disordering of the ground-state quasiperiodicity at low temperatures is proposed and corroborated with exact and renormalization-group calculations of

Lei-Han Tang; Marko V. Jaric

1990-01-01

289

Reducing tile complexity for self-assembly through temperature programming  

Microsoft Academic Search

We consider the tile self-assembly model and how tile complexity can be eliminated by permitting the tem- perature of the self-assembly system to be adjusted throughout the assembly process. To do this, we pro- pose novel techniques for designing tile sets that permit an arbitrary length m binary number to be encoded into a sequence of O(m) temperature changes such

Ming-Yang Kao; Robert T. Schweller

2006-01-01

290

New method to measure the attenuation of hadrons in extensive air showers  

SciTech Connect

Extensive air showers are generated through interactions of high-energy cosmic rays impinging the Earth's atmosphere. A new method is described to infer the attenuation of hadrons in air showers. The numbers of electrons and muons, registered with the scintillator array of the KASCADE experiment, are used to estimate the energy of the shower inducing primary particle. A large hadron calorimeter is used to measure the hadronic energy reaching observation level. The ratio of energy reaching ground level to the energy of the primary particle is used to derive an attenuation length of hadrons in air showers. In the energy range from 10{sup 6} to 3x10{sup 7} GeV the attenuation length obtained increases from 170 to 210 g/cm{sup 2}. The experimental results are compared to predictions of simulations based on contemporary high-energy interaction models.

Apel, W. D.; Badea, F.; Bekk, K.; Bozdog, H.; Daumiller, K.; Doll, P.; Engel, R.; Engler, J.; Finger, M.; Gils, H. J.; Haungs, A.; Heck, D.; Huege, T.; Isar, P. G.; Klages, H. O.; Mathes, H. J.; Mayer, H. J.; Milke, J.; Nehls, S.; Oehlschlaeger, J. [Institut fuer Kernphysik, Forschungszentrum Karlsruhe, 76021 Karlsruhe (Germany)] (and others)

2009-07-15

291

Steel specification for the Atlas calorimeter.  

National Technical Information Service (NTIS)

As part of a collaborative experimental High Energy Physics experiment at the LHC Facility, CERN Laboratory, Geneva Switzerland, a group of US institutions has accepted the responsibility for constructing a large portion of the calorimeter for this experi...

V. Guarino

1998-01-01

292

Extruded Plastic Scintillator for the Minos Calorimeters.  

National Technical Information Service (NTIS)

MINOS is a long-baseline, neutrino-oscillation experiment. Two iron- and scintillator-calorimeters will be built, requiring almost 300 tons of finished plastic scintillator. In order to lower the scintillator costs, MINOS will use an extruded rectangular ...

A. Pla-Dalmau

2001-01-01

293

Hermeticity of Three Cryogenic Calorimeter Geometries.  

National Technical Information Service (NTIS)

We calculate the effect of cracks and dead material on resolution in three simplified cryogenic calorimeter geometries, using a crude approximation that neglects transverse shower spreading and considers only a small set of incident angles. For each dead ...

M. Strovink W. J. Wormersley G. E. Forden

1989-01-01

294

Geometric structures in hadronic cores of extensive air showers observed by KASCADE  

SciTech Connect

The geometric distribution of high-energy hadrons {>=}100 GeV in shower cores measured with the KASCADE calorimeter is analyzed. The data are checked for sensitivity to hadronic interaction features and indications of new physics as discussed in the literature. The angular correlation of the most energetic hadrons and, in particular, the fraction of events with hadrons being aligned are quantified by means of the commonly used parameter {lambda}{sub 4}. The analysis shows that the observed {lambda}{sub 4} distribution is compatible with that predicted by simulations and is not linked to an angular correlation from hadronic jet production at high energy. Another parameter, d{sub 4}{sup max}, describing distances between hadrons measured in the detector, is found to be sensitive both to the transverse momenta in secondary hadron production and the primary particle type. Transverse momenta in high-energy hadron interactions differing by a factor two or more from what is assumed in the standard simulations are disfavored by the measured d{sub 4}{sup max} distribution.

Antoni, T.; Glasstetter, R.; Hoerandel, J.R.; Roth, M. [Institut fuer Experimentelle Kernphysik, Universitaet Karlsruhe, 76021 Karlsruhe (Germany); Apel, W.D.; Badea, F.; Bekk, K.; Bozdog, H.; Daumiller, K.; Doll, P.; Engel, R.; Engler, J.; Fessler, F.; Gils, H.J.; Haungs, A.; Heck, D.; Klages, H.O.; Maier, G.; Mathes, H.J.; Mayer, H.J. [Forschungszentrum Karlsruhe, Institut fuer Kernphysik, 76021 Karlsruhe (Germany)] [and others

2005-04-01

295

Tile arranging apparatus for automatic game playing table  

US Patent & Trademark Office Database

A pai (tile) arranging apparatus for an automatic playing table for a game known by the trademark Mah-Jongg, which includes a hopper provided in the playing table, a mixing unit which includes a turntable provided in the hopper, an orientation control unit for controlling orientations of plural pais (tiles), a transferring unit for transferring the tiles, an orientation detecting unit for detecting the orientations of the tiles, and an orientation correcting unit which is operative in response to a detecting signal of the orientation correcting unit.

Okuno; Toshinori (Saitama, JP); Nakamura; Hiroshi (Saitama, JP)

1985-08-13

296

The relationship between magmatic tiling, fluid flow and crystal fraction  

NASA Astrophysics Data System (ADS)

Tiling of crystals in magmatic rocks is used to indicate flow in the magmatic state and also as an indicator of shear sense. The status of tiling as a kinematic indicator is often regarded with caution due to a poor understanding of the dynamics involved in its development. By considering a simple numerical model involving both rotation and translation of pairs of crystal objects under different homogeneous steady state flow conditions (i.e. 0?Wk?1.5), the dynamics of crystal tiling is studied in detail. A consistent relationship between tiling proportions (i.e. dextral versus sinistral) and Wk is observed. For pure shear the relationship is 50/50 whereas for simple shear one sense dominates accounting for 70% of the tiling. A similar relationship is observed for low and high crystal fractions and a wide variety of object aspect ratios. Through application of the statistics of proportions it is shown that approximately 60 observations are required for a shear sense determination, whereas for accurate estimation of Wk at least 200 observations are required. The density of tiling varies with crystal fraction and it may be possible to use the frequency of occurrence of tiling to estimate the crystal fraction at the time of tiling. It is concluded that a few observations of crystal tiling is a highly unreliable shear sense indicator.

Mulchrone, Kieran F.; Grogan, Suzanne; de, Prithwijit

2005-02-01

297

Inner Calorimeter in Clas/dvcs Experiment  

NASA Astrophysics Data System (ADS)

The new Inner Calorimeter (IC) was developed specifically for dedicated CLAS/DVCS experiment.1 IC consists of 424 PbWO4 tapered crystals readout by avalanche photodiodes (APD) followed by low-noise preamplifiers. It is a high precision calorimeter with energy resolution better than 3% at 2-5 GeV and has an angle resolution of 3 to 4 mrad.

Niyazov, Rustam

2008-03-01

298

The Primary Proton Spectrum of Cosmic Rays Measured with Single Hadrons at Ground Level  

NASA Astrophysics Data System (ADS)

The flux of cosmic-ray-induced single hadrons near sea level has been measured with the large hadron calorimeter of the KASCADE experiment. The measurement corroborates former results obtained with detectors of smaller size if the enlarged veto of the 304 m2 calorimeter surface is accounted for. The program CORSIKA/QGSJET is used to compute the cosmic-ray flux above the atmosphere. Between E0=300 GeV and 1 PeV the primary proton spectrum can be described with a power law parameterized as dJ/dE0=(0.15+/-0.03)E-2.78+/-0.030 m-2 s-1 sr-1 TeV-1. At the lower energy end the proton flux compares well with the results from recent direct measurements.

Antoni, T.; Apel, W. D.; Badea, F.; Bekk, K.; Bercuci, A.; Blümer, H.; Bozdog, H.; Brancus, I. M.; Büttner, C.; Chilingarian, A.; Daumiller, K.; Doll, P.; Engel, R.; Engler, J.; Feßler, F.; Gils, H. J.; Glasstetter, R.; Haungs, A.; Heck, D.; Hörandel, J. R.; Kampert, K.-H.; Klages, H. O.; Maier, G.; Mathes, H. J.; Mayer, H. J.; Milke, J.; Müller, M.; Obenland, R.; Oehlschläger, J.; Ostapchenko, S.; Petcu, M.; Rebel, H.; Risse, A.; Risse, M.; Roth, M.; Schatz, G.; Schieler, H.; Scholz, J.; Thouw, T.; Ulrich, H.; van Buren, J.; Vardanyan, A.; Weindl, A.; Wochele, J.; Zabierowski, J.

2004-09-01

299

The Intricate Art of Persian Tiles: An Interview with Jafar Mogadam.  

ERIC Educational Resources Information Center

Transcribes an interview with Jafar Mogadam, an Iranian artist who paints Persian tiles. Traces Mogadam's development as an artist and describes how he creates his tile compositions. Provides a brief history of Persian tiles. (DSK)

Gamble, Harriet

1998-01-01

300

Recent Developments and Validations in Geant4 Hadronic Physics  

SciTech Connect

The Geant4 hadronic models cover the entire range of energies required by calorimeters in new and planned experiments. The extension and improvement of the elastic, cascade, parameterized and quark-gluon string models will be discussed. Such improvements include the extension to more particle types, a review and correction of cross sections, and a better treatment of energy and momentum conservation. Concurrent with this development has been a validation program which includes comparisons with double differential cross sections. An ongoing hadronic shower validation will also be discussed which includes the examination of longitudinal shower shapes and the performance of the above models as well as their interaction with electromagnetic processes such as multiple scattering.

Wright, Dennis H.; Koi, Tatsumi [Stanford Linear Accelerator Center, Menlo Park, California (United States); Folger, Gunter; Ivantchenko, Vladimir; Kossov, Mikhail; Starkov, Nikolai [CERN, Geneva (Switzerland); Heikkinen, Aatos [Helsinki Institute of Physics, Helsinki (Finland); Wellisch, Hans-Peter [Geneva (Switzerland)

2006-10-27

301

Recent Developments And Validations in Geant4 Hadronic Physics  

SciTech Connect

The Geant4 hadronic models cover the entire range of energies required by calorimeters in new and planned experiments. The extension and improvement of the elastic, cascade, parameterized and quark-gluon string models will be discussed. Such improvements include the extension to more particle types, a review and correction of cross sections, and a better treatment of energy and momentum conservation. Concurrent with this development has been a validation program which includes comparisons with double differential cross sections. An ongoing hadronic shower validation will also be discussed which includes the examination of longitudinal shower shapes and the performance of the above models as well as their interaction with electromagnetic processes such as multiple scattering.

Wright, D.H.; Koi, T.; Folger, G.; Ivanchenko, V.; Kossov, M.; Starkov, N.; Heikkinen, A.; Wellisch, H.P.; /SLAC /CERN /Helsinki Inst. of Phys.

2007-02-12

302

Transportable high sensitivity small sample radiometric calorimeter  

SciTech Connect

A new small-sample, high-sensitivity transportable radiometric calorimeter, which can be operated in different modes, contains an electrical calibration method, and can be used to develop secondary standards, will be described in this presentation. The data taken from preliminary tests will be presented to indicate the precision and accuracy of the instrument. The calorimeter and temperature-controlled bath, at present, require only a 30-in. by 20-in. tabletop area. The calorimeter is operated from a laptop computer system using unique measurement module capable of monitoring all necessary calorimeter signals. The calorimeter can be operated in the normal calorimeter equilibration mode, as a comparison instrument, using twin chambers and an external electrical calibration method. The sample chamber is 0.75 in (1.9 cm) in diameter by 2.5 in. (6.35 cm) long. This size will accommodate most {sup 238}Pu heat standards manufactured in the past. The power range runs from 0.001 W to <20 W. The high end is only limited by sample size.

Wetzel, J.R.; Biddle, R.S.; Cordova, B.S.; Sampson, T.E.; Dye, H.R.; McDow, J.G.

1998-12-31

303

Measurement of the hadronic photon structure function at LEP 1 for values between 9.9 and 284 GeV2  

NASA Astrophysics Data System (ADS)

Inclusive ?*? interactions to hadronic final states where one scattered electron or positron is detected in the electromagnetic calorimeters have been studied in the LEP 1 data taken by ALEPH from 1991 to 1995. The event sample has been used to measure the hadronic structure function of the photon F2? in three bins with of 9.9, 20.7 and 284 GeV2.

ALEPH Collaboration; Barate, R.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J.-P.; Merle, E.; Minard, M.-N.; Pietrzyk, B.; Alemany, R.; Casado, M. P.; Chmeissani, M.; Crespo, J. M.; Fernandez, E.; Fernandez-Bosman, M.; Garrido, Ll.; Graugès, E.; Juste, A.; Martinez, M.; Merino, G.; Miquel, R.; Mir, Ll. M.; Pacheco, A.; Park, I. C.; Riu, I.; Colaleo, A.; Creanza, D.; de Palma, M.; Gelao, G.; Iaselli, G.; Maggi, G.; Maggi, M.; Nuzzo, S.; Ranieri, A.; Raso, G.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Tricomi, A.; Zito, G.; Huang, X.; Lin, J.; Ouyang, Q.; Wang, T.; Xie, Y.; Xu, R.; Xue, S.; Zhang, J.; Zhang, L.; Zhao, W.; Abbaneo, D.; Becker, U.; Boix, G.; Cattaneo, M.; Cerutti, F.; Ciulli, V.; Dissertori, G.; Drevermann, H.; Forty, R. W.; Frank, M.; Halley, A. W.; Hansen, J. B.; Harvey, J.; Janot, P.; Jost, B.; Lehraus, I.; Leroy, O.; Mato, P.; Minten, A.; Moutoussi, A.; Ranjard, F.; Rolandi, L.; Rousseau, D.; Schlatter, D.; Schmitt, M.; Schneider, O.; Spagnolo, P.; Tejessy, W.; Teubert, F.; Tomalin, I. R.; Tournefier, E.; Wright, A. E.; Ajaltouni, Z.; Badaud, F.; Chazelle, G.; Deschamps, O.; Falvard, A.; Ferdi, C.; Gay, P.; Guicheney, C.; Henrard, P.; Jousset, J.; Michel, B.; Monteil, S.; Montret, J.-C.; Pallin, D.; Perret, P.; Podlyski, F.; Hansen, J. D.; Hansen, J. R.; Hansen, P. H.; Nilsson, B. S.; Rensch, B.; Wäänänen, A.; Daskalakis, G.; Kyriakis, A.; Markou, C.; Simopoulou, E.; Siotis, I.; Vayaki, A.; Blondel, A.; Bonneaud, G.; Brient, J.-C.; Rougé, A.; Rumpf, M.; Swynghedauw, M.; Verderi, M.; Videau, H.; Focardi, E.; Parrini, G.; Zachariadou, K.; Cavanaugh, R.; Corden, M.; Georgiopoulos, C.; Antonelli, A.; Bencivenni, G.; Bologna, G.; Bossi, F.; Campana, P.; Capon, G.; Chiarella, V.; Laurelli, P.; Mannocchi, G.; Murtas, F.; Murtas, G. P.; Passalacqua, L.; Pepe-Altarelli, M.; Curtis, L.; Lynch, J. G.; Negus, P.; O'Shea, V.; Raine, C.; Teixeira-Dias, P.; Thompson, A. S.; Buchmüller, O.; Dhamotharan, S.; Geweniger, C.; Hanke, P.; Hansper, G.; Hepp, V.; Kluge, E. E.; Putzer, A.; Sommer, J.; Tittel, K.; Werner, S.; Wunsch, M.; Ghete, V. M.; Girtler, P.; Kneringer, E.; Kuhn, D.; Rudolph, G.; Bowdery, C. K.; Buck, P. G.; Finch, A. J.; Foster, F.; Hughes, G.; Jones, R. W. L.; Robertson, N. A.; Williams, M. I.; Giehl, I.; Jakobs, K.; Kleinknecht, K.; Quast, G.; Renk, B.; Rohne, E.; Sander, H.-G.; Wachsmuth, H.; Zeitnitz, C.; Aubert, J. J.; Benchouk, C.; Bonissent, A.; Carr, J.; Coyle, P.; Etienne, F.; Motsch, F.; Payre, P.; Talby, M.; Thulasidas, M.; Aleppo, M.; Antonelli, M.; Ragusa, F.; Büscher, V.; Dietl, H.; Ganis, G.; Hüttmann, K.; Lütjens, G.; Mannert, C.; Männer, W.; Moser, H.-G.; Schael, S.; Settles, R.; Seywerd, H.; Stenzel, H.; Wiedenmann, W.; Wolf, G.; Azzurri, P.; Boucrot, J.; Callot, O.; Chen, S.; Cordier, A.; Davier, M.; Duflot, L.; Grivaz, J.-F.; Heusse, Ph.; Jacholkowska, A.; Le Diberder, F.; Lefrançois, J.; Lutz, A.-M.; Schune, M.-H.; Veillet, J.-J.; Videau, I.; Zerwas, D.; Bagliesi, G.; Bettarini, S.; Boccali, T.; Bozzi, C.; Calderini, G.; dell'Orso, R.; Ferrante, I.; Foà, L.; Giassi, A.; Gregorio, A.; Ligabue, F.; Lusiani, A.; Marrocchesi, P. S.; Messineo, A.; Palla, F.; Rizzo, G.; Sanguinetti, G.; Sguazzoni, G.; Tenchini, R.; Vannini, C.; Venturi, A.; Verdini, P. G.; Blair, G. A.; Cowan, G.; Green, M. G.; Medcalf, T.; Strong, J. A.; von Wimmersperg-Toeller, J. H.; Botterill, D. R.; Clifft, R. W.; Edgecock, T. R.; Norton, P. R.; Thompson, J. C.; Bloch-Devaux, B.; Colas, P.; Emery, S.; Kozanecki, W.; Lançon, E.; Lemaire, M.-C.; Locci, E.; Perez, P.; Rander, J.; Renardy, J.-F.; Roussarie, A.; Schuller, J.-P.; Schwindling, J.; Trabelsi, A.; Vallage, B.; Black, S. N.; Dann, J. H.; Johnson, R. P.; Kim, H. Y.; Konstantinidis, N.; Litke, A. M.; McNeil, M. A.; Taylor, G.; Booth, C. N.; Cartwright, S.; Combley, F.; Kelly, M. S.; Lehto, M.; Thompson, L. F.; Affholderbach, K.; Böhrer, A.; Brandt, S.; Grupen, C.; Prange, G.; Giannini, G.; Gobbo, B.; Rothberg, J.; Wasserbaech, S.; Armstrong, S. R.; Charles, E.; Elmer, P.; Ferguson, D. P. S.; Gao, Y.; González, S.; Greening, T. C.; Hayes, O. J.; Hu, H.; Jin, S.; McNamara, P. A., III; Nachtman, J. M.; Nielsen, J.; Orejudos, W.; Pan, Y. B.; Saadi, Y.; Scott, I. J.; Walsh, J.; Wu, Sau Lan; Wu, X.; Zobernig, G.

1999-07-01

304

Measurement of the hadronic photon structure function at LEP 1 for ? Q 2? values between 9.9 and 284 GeV 2  

Microsoft Academic Search

Inclusive ??? interactions to hadronic final states where one scattered electron or positron is detected in the electromagnetic calorimeters have been studied in the LEP 1 data taken by ALEPH from 1991 to 1995. The event sample has been used to measure the hadronic structure function of the photon F2? in three bins with ?Q2? of 9.9, 20.7 and 284

S. R. Armstrong; E. Charles; P. Elmer; D. P. S. Ferguson; Y. Gao; S. González; T. C. Greening; O. J. Hayes; H. Hu; S. Jin; P. A. McNamara III; J. M. Nachtman; J. Nielsen; W. Orejudos; Y. B. Pan; Y. Saadi; I. J. Scott; J. Walsh; Sau Lan Wu; X. Wu; G. Zobernig; Ll. M. Mir; A. Pacheco; I. C. Park; I. Riu; A. Colaleo; D. Creanza; M. de Palma; G. Gelao; G. Iaselli; G. Maggi; M. Maggi; S. Nuzzo; A. Ranieri; G. Raso; F. Ruggieri; G. Selvaggi; L. Silvestris; P. Tempesta; A. Tricomi; G. Zito; X. Huang; J. Lin; Q. Ouyang; T. Wang; Y. Xie; R. Xu; S. Xue; J. Zhang; L. Zhang; W. Zhao; D. Abbaneo; U. Becker; G. Boix; M. Cattaneo; F. Cerutti; V. Ciulli; G. Dissertori; H. Drevermann; R. W. Forty; M. Frank; A. W. Halley; J. B. Hansen; J. Harvey; P. Janot; B. Jost; I. Lehraus; O. Leroy; P. Mato; A. Minten; A. Moutoussi; F. Ranjard; L. Rolandi; D. Rousseau; D. Schlatter; M. Schmitt; O. Schneider; P. Spagnolo; W. Tejessy; F. Teubert; I. R. Tomalin; E. Tournefier; A. E. Wright; Z. Ajaltouni; F. Badaud; G. Chazelle; O. Deschamps; A. Falvard; C. Ferdi; P. Gay; C. Guicheney; P. Henrard; J. Jousset; B. Michel; S. Monteil; J.-C. Montret; D. Pallin; P. Perret; F. Podlyski; J. D. Hansen; P. H. Hansen; B. S. Nilsson; B. Rensch; A. Wäänänen; G. Daskalakis; A. Kyriakis; C. Markou; E. Simopoulou; I. Siotis; A. Vayaki; A. Blondel; G. Bonneaud; J.-C. Brient; A. Rougé; M. Rumpf; M. Swynghedauw; M. Verderi; H. Videau; E. Focardi; G. Parrini; K. Zachariadou; R. Cavanaugh; M. Corden; C. Georgiopoulos; A. Antonelli; G. Bencivenni; G. Bologna; F. Bossi; P. Campana; G. Capon; V. Chiarella; P. Laurelli; G. Mannocchi; F. Murtas; G. P. Murtas; L. Passalacqua; M. Pepe-Altarelli; L. Curtis; J. G. Lynch; P. Negus; V. O'Shea; C. Raine; P. Teixeira-Dias; A. S. Thompson; O. Buchmüller; S. Dhamotharan; C. Geweniger; P. Hanke; G. Hansper; V. Hepp; E. E. Kluge; A. Putzer; J. Sommer; K. Tittel; S. Werner; M. Wunsch; V. M. Ghete; P. Girtler; E. Kneringer; D. Kuhn; G. Rudolph; C. K. Bowdery; P. G. Buck; A. J. Finch; F. Foster; G. Hughes; R. W. L. Jones; N. A. Robertson; M. I. Williams; I. Giehl; K. Jakobs; K. Kleinknecht; G. Quast; B. Renk; E. Rohne; H.-G. Sander; H. Wachsmuth; C. Zeitnitz; J. J. Aubert; C. Benchouk; A. Bonissent; J. Carr; P. Coyle; F. Etienne; F. Motsch; P. Payre; M. Talby; M. Thulasidas; M. Aleppo; M. Antonelli; F. Ragusa; V. Büscher; H. Dietl; G. Ganis; K. Hüttmann; G. Lütjens; C. Mannert; W. Männer; H.-G. Moser; S. Schael; R. Settles; H. Seywerd; H. Stenzel; W. Wiedenmann; G. Wolf; P. Azzurri; J. Boucrot; O. Callot; S. Chen; A. Cordier; M. Davier; L. Duflot; J.-F. Grivaz; Ph. Heusse; A. Jacholkowska; F. Le Diberder; J. Lefrançois; A.-M. Lutz; M.-H. Schune; J.-J. Veillet; I. Videau; D. Zerwas; G. Bagliesi; S. Bettarini; T. Boccali; C. Bozzi; G. Calderini; R. dell'Orso; I. Ferrante; L. Foà; A. Giassi; A. Gregorio; F. Ligabue; A. Lusiani; P. S. Marrocchesi; A. Messineo; F. Palla; G. Rizzo; G. Sanguinetti; G. Sguazzoni; R. Tenchini; C. Vannini; A. Venturi; P. G. Verdini; G. A. Blair; G. Cowan; M. G. Green; T. Medcalf; J. A. Strong; J. H. von Wimmersperg-Toeller; D. R. Botterill; R. W. Clifft; T. R. Edgecock; P. R. Norton; J. C. Thompson; B. Bloch-Devaux; P. Colas; S. Emery; W. Kozanecki; E. Lançon; M.-C. Lemaire; E. Locci; P. Perez; J. Rander; J.-F. Renardy; A. Roussarie; J.-P. Schuller; J. Schwindling; A. Trabelsi; B. Vallage; S. N. Black; J. H. Dann; R. P. Johnson; H. Y. Kim; N. Konstantinidis; A. M. Litke; M. A. McNeil; G. Taylor; C. N. Booth; S. Cartwright; F. Combley; M. S. Kelly; M. Lehto; L. F. Thompson; K. Affholderbach; A. Böhrer; S. Brandt; C. Grupen; G. Prange; G. Giannini; B. Gobbo; J. Rothberg; S. Wasserbaech; P. Elmer; Sau Lan Wu

1999-01-01

305

Tile Percolation: An OpenMP Tile Aware Parallelization Technique for the Cyclops-64 Multicore Processor  

NASA Astrophysics Data System (ADS)

Programming a multicore processor is difficult. It is even more difficult if the processor has software-managed memory hierarchy, e.g. the IBM Cyclops-64 (C64). A widely accepted parallel programming solution for multicore processor is OpenMP. Currently, all OpenMP directives are only used to decompose computation code (such as loop iterations, tasks, code sections, etc.). None of them can be used to control data movement, which is crucial for the C64 performance. In this paper, we propose a technique called tile percolation. This method provides the programmer with a set of OpenMP pragma directives. The programmer can use these directives to annotate their program to specify where and how to perform data movement. The compiler will then generate the required code accordingly. Our method is a semi-automatic code generation approach intended to simplify a programmer’s work. The paper provides (a) an exploration of the possibility of developing pragma directives for semi-automatic data movement code generation in OpenMP; (b) an introduction of techniques used to implement tile percolation including the programming API, the code generation in compiler, and the required runtime support routines; (c) and an evaluation of tile percolation with a set of benchmarks. Our experimental results show that tile percolation can make the OpenMP programs run on the C64 chip more efficiently.

Gan, Ge; Wang, Xu; Manzano, Joseph; Gao, Guang R.

306

Predicting soil water, tile drainage, and runoff in a mole?tile drained soil  

Microsoft Academic Search

There has been considerable intensification of agriculture on mole?tile drained soils in New Zealand. Management techniques and tools are needed for predicting and understanding water and nutrient transport. While simple water balance models have been effective in estimating soil water deficit, such models cannot differentiate between the different water loss mechanisms. More complex water?transport models include the ability to predict

V. O. Snow; D. J. Houlbrooke; N. I. Huth

2007-01-01

307

Complex tiling patterns in liquid crystals  

PubMed Central

In this account recent progress in enhancing the complexity of liquid crystal self-assembly is highlighted. The discussed superstructures are formed mainly by polyphilic T-shaped and X-shaped molecules composed of a rod-like core, tethered with glycerol units at both ends and flexible non-polar chain(s) in lateral position, but also related inverted molecular structures are considered. A series of honeycomb phases composed of polygonal cylinders ranging from triangular to hexagonal, followed by giant cylinder honeycombs is observed for ternary T-shaped polyphiles on increasing the size of the lateral chain(s). Increasing the chain size further leads to new modes of lamellar organization followed by three-dimensional and two-dimensional structures incorporating branched and non-branched axial rod-bundles. Grafting incompatible chains to opposite sides of the rod-like core leads to quaternary X-shaped polyphiles. These form liquid crystalline honeycombs where different cells are filled with different material. Projected on an Euclidian plane, all honeycomb phases can be described either by uniformly coloured Archimedean and Laves tiling patterns (T-shaped polyphiles) or as multi-colour tiling patterns (X-shaped polyphiles). It is shown that geometric frustration, combined with the tendency to segregate incompatible chains into different compartments and the need to find a periodic tiling pattern, leads to a significant increase in the complexity of soft self-assembly. Mixing of different chains greatly enhances the number of possible ‘colours’ and in this way, periodic structures comprising up to seven distinct compartments can be generated. Relations to biological self-assembly are discussed shortly.

Tschierske, C.; Nurnberger, C.; Ebert, H.; Glettner, B.; Prehm, M.; Liu, F.; Zeng, X.-B.; Ungar, G.

2012-01-01

308

Central calorimeter gamma detection efficiency  

SciTech Connect

In this memo they present some results on the Central Calorimeter {gamma} detection efficiency in the low energy region. Briefly, the software energy threshold to start a cluster has to be decided on the basis of the detection efficiency because using a too low value increases the amount of spurious clusters and on the other hand a too high threshold tends to reject good clusters. They used a sample of reconstructed {pi}{sup 0}{pi}{sup 0} events at E{sub CM} = 2.985 GeV with a cluster threshold at 20 MeV and 5 MeV for the central block. For each event they selected the least energetic {gamma} among the fitted values. The energy distribution of the low energy tail is shown in Fig. 1.a. The expected {gamma} energy distribution has been simulated by Monte Carlo. Events p{bar p} {yields} {pi}{sup 0}{pi}{sup 0} were generated starting with the experimental center of mass angular distribution. They selected events with 4{gamma} in the Central Calorimeter acceptance and considered the least energetic {gamma} among the four. The generated distribution is shown in Fig. 1.b. The detection efficiency as a function of E{sub {gamma}} can be computed comparing the experimental softest {gamma} energy distribution to the expected from Monte Carlo. The normalization can be done in several ways: (a) assuming a 100% detection efficiency for {gamma} with energy within 200 and 400 MeV; (b) normalizing the total number of reconstructed events. The two methods gave normalization constants differing by less than 1%. In Fig. 2 they show the detection efficiency plot as a function of the {gamma} energy. The curve is rather sharp and at around 30 MeV the efficiency saturates at 1. They notice that efficiency is slightly higher than 1., and they explain the anomalous behavior as an indication of a contribution of background events, which tends to be higher with soft {gamma}'s.

Lombardo, M.; Marchetto, F.; /Turin U. /INFN, Turin

1992-05-01

309

Test beam results with LuAG fibers for next-generation calorimeters  

NASA Astrophysics Data System (ADS)

For the next generation of calorimeters, designed to improve the energy resolution of hadrons and jet measurements, there is a need for highly granular detectors that require peculiar geometries. Inorganic scintillators can provide good stopping power to allow compact calorimeter designs together with an excellent energy resolution. The micropulling-down technique allows to grow crystal fibers with high aspect ratio providing good granularity. Designs based on dual-readout could also be considered since the host matrices of extrinsic scintillators behave as a Cherenkov radiator in the absence of the scintillating dopant. We report here about results obtained with crystal fibers of 22 cm length and 2 mm diameter of lutetium aluminium garnet (LuAG, Lu3Al5O12). The response of such fibers in a high energy physics environment has been investigated through a test beam campaign at the CERN PS facility using electrons in the 50–150 GeV energy range. The results, proving the potential of LuAG fibers for calorimetry applications, have been used to validate a Geant4 simulation which allowed to study different configuration of a fiber-based detector. Possible implementations of the crystal fibers technology into a real calorimeter are also discussed.

Lucchini, M.; Medvedeva, T.; Pauwels, K.; Tully, C.; Heering, A.; Dujardin, C.; Lebbou, K.; Lecoq, P.; Auffray, E.

2013-10-01

310

A bit-serial first-level calorimeter trigger for an LHC detector  

SciTech Connect

A preliminary design of a compact first-level calorimeter trigger, implemented as a farm of local bit-serial systolic arrays, is presented. The bit-serial data representation allows higher processing rates and more compact designs than are possible when using parallel data. More functionally can be incorporated into the Application Specific Integrated Circuits (ASICs) that serve as the main processing elements. The trigger processor seeks local energy clusters, evaluates isolation criteria within the electromagnetic calorimeter and leakage into the hadron calorimeter in order to detect electrons. It uses cluster finding algorithms to identify jets and missing transverse energy to estimate neutrino energies. The processor output serves as decision support for the central first-level trigger and delivers region-of-interest positions to the second-level trigger. In its present form the trigger processor design relies on optical fibers to deliver the input data from the front-end modules and multi-chip modules (MCMs) to harbor the processing ASICs. The fact that the main part of the trigger processor can fit into one or two large crates suggests that the design is not limited by size nor is it strictly limited by cost but can be expanded to accommodate extended algorithms if these are found necessary. Extensive physics simulations will explore these possibilities.

Bohm, C.; Appelquist, G.; Zhao, X.; Yamdagni, N.; Hellman, S.; Johansson, E.; Sellden, B. (Univ. of Stockholm (Sweden))

1994-08-01

311

Time and tiles on the brain.  

PubMed

Both the quasicrystalline appearance of mammalian cerebral cortex and the quasiperiodicity of mammalian cerebral compound field potentials (EEG/ERBP) have long been noted. A recent experiment claims to show the eigenvalue spectrum of a quasiperiodic tiling of coupled oscillators in the plane; and this spectrum of resonant frequencies has some analogies with that of mammalian EEG/ERBP. Concurrently, Connectionist literature now admits the significance of internally generated network rhythmicity in Non-Lipschitzian neurodynamics. It may be time to test the hypotheses of: (a) quasi-crystalline icosahedral symmetry of neocortical architectonics and (b) some fractal characteristics of EEG/ERBP under behavioral conditions. PMID:2265946

Stowell, H

1990-08-01

312

Glazed tiles manufactured from incinerated sewage sludge ash and clay.  

PubMed

Sewage sludge incineration is applied extensively in highly populated cities as a final sludge treatment. In this study, incinerated ash was utilized as an additive to clay to manufacture glaze tiles. Four different amounts of ash (0, 15, 30, and 45%) were added, and five glaze concentrations (0.03, 0.06, 0.1, 0.15, and 0.2 g/cm2) were applied on the surface of biscuit tiles to study the effects of ash additive and glaze concentration on properties of fired samples. Sewage sludge was dehydrated and incinerated into ash at 800 degrees C. Subsequently, tile specimens were manufactured and fired at 800 degrees C to make biscuit tiles. Fritted glazes and iron oxide were used as the fundamental glaze and colorant, respectively. Finally, glaze was applied on the surface of biscuit tiles and then fired at 1050 degrees C to sinter them into glazed tile specimens. Tests were performed to analyze properties, including water absorption, firing shrinkage, weight loss on ignition, abrasion resistance, bending resistance, acid-alkali resistance, and aging resistance on specimens of glaze tile. To further understand more about the microstructural behavior of glazed tile specimens, analysis of energy dispersive spectrometer, scanning electron microscopy, and X-ray were carried out in this study. PMID:15796106

Lin, Deng-Fong; Luo, Huan-Lin; Sheen, Yeong-Nain

2005-02-01

313

Nitrate in Tile Drainage of the Semiarid Palouse Basin  

Microsoft Academic Search

Topographically heterogeneous agricultural landscapes can complicate and accelerate agrochemical contamination of streams due to rapid transport of water and chemicals to poorly drained lower-landscape positions and shallow ground water. In the semiarid Palouse region, large parts of these landscapes have been tile drained to enhance crop yield. From 2000-2004 we monitored the discharge of a tile drain (TD) and a

C. Kent Keller; Caroline N. Butcher; Jeffrey L. Smith; Richelle M. Allen-King

2008-01-01

314

Solving NP-complete problems in the tile assembly model  

Microsoft Academic Search

Formalized study of self-assembly has led to the definition of the tile assembly model, a highly distributed parallel model of computation that may be implemented using molecules or a large computer network such as the Internet. Previously, I defined deterministic and nondeterministic computation in the tile assembly model and showed how to add, multiply, and factor. Here, I extend the

Yuriy Brun

2008-01-01

315

Service life prediction modelling of adhesive ceramic tiling systems  

Microsoft Academic Search

Although ceramic tiling on building facades has a history of long durability and service life, a number of service life anomalies in modern buildings have occurred. To identify the factors and address this problem, a method is developed for the service life prediction of adhesive ceramic tiling systems based on a successful model for render and natural stone cladding. The

Rita Bordalo; Jorge de Brito; Pedro Lima Gaspar; Ana Silva

2011-01-01

316

Thermodynamic behavior of a Penrose-tiling quasicrystal  

Microsoft Academic Search

The Penrose tiling provides a prototype for the quasiperiodic crystal model of quasicrystals. We report results of Monte Carlo simulations of a two-dimensional model in which a Penrose tiling is the ground state. A single energy is assigned to any violation of the Penrose matching rules. Our results support the existence of two separate phase transitions, corresponding to single- and

Katherine J. Strandburg; Paul R. Dressel

1990-01-01

317

Automatic Alignment of Tiled Displays for A Desktop Environment  

Microsoft Academic Search

Tiling an array of projectors has become a practical way to construct a high resolution display system. Unfortunately, such high-resolution display systems have limited use be- cause they require specially developed parallel visualiza- tion programs that run on a custom-designed parallel ma- chine or a PC cluster. This paper presents an automatic alignment mechanism for arbitrarily tiled displays running a

Grant Wallacey

318

Selecting the tile shape to reduce the total communication volume  

Microsoft Academic Search

In this paper we revisit the tile-shape selection prob- lem, that has been extensively discussed in bibliography. An ecient approach is proposed for the selection of a suitable tile shape, based on the minimization of the process communication volume. We consider the large family of applications that arise from the discretiza- tion of partial dier ential equations (PDEs). Practi- cal

Nikolaos Drosinos; Georgios I. Goumas; Nectarios Koziris

2006-01-01

319

Thermal Contact Conductance Measurements on Doublet III Armor Tile Graphite.  

National Technical Information Service (NTIS)

Several tests were performed on the Doublet III wall armor tiles to determine the cool-down rate and to evaluate improvements made by changing the conditions at the interface between the graphite tile and the stainless steel backing plate. Thermal diffusi...

D. W. Doll E. Reis

1983-01-01

320

The production of radiation tolerant vacuum phototriodes and their HV filters for the Compact Muon Solenoid endcap electromagnetic calorimeter  

NASA Astrophysics Data System (ADS)

Particle detectors which will operate at the Large Hadron Collider face unprecedented challenges in both the number of active detector elements and in operating without maintenance in a high radiation environment for many years. In the Compact Muon Solenoid (CMS) detector the scintillating crystal electromagnetic calorimeter uses vacuum photodetectors in the endcap where the lifetime neutron and hadron fluence is too high for the silicon avalanche photodiodes used in the barrel. Over 15000 radiation tolerant vacuum phototriodes (VPT) have been now been produced by industry for the endcap calorimeter. The VPT have to operate in an environment which has both a significant lifetime dose (up to 50 kGy) from electrons and gamma rays and a high neutron fluence (up to nearly 1015 n.cm-2 for E > 100 keV). This paper discusses the steps taken during both the development and production of the VPT to ensure that the response to the scintillation light from the lead tungstate scintillator will not be significantly degraded during the operational lifetime of the experiment. Data from the quality assurance procedures and radiation induced degradation of complete VPT devices is presented. Other components of the endcap calorimeter are also exposed to a similarly intense radiation field. The quality assurance procedure used to select the passive components (resistors and capacitors) used in the high-voltage filter cards is described.

Hobson, P. R.

2007-10-01

321

Tritium calorimeter setup and operation  

SciTech Connect

The LBNL tritium calorimeter is a stable instrument capable of measuring tritium with a sensitivity of 25 Ci. Measurement times range from 8-hr to 7-days depending on the thermal conductivity and mass of the material being measured. The instrument allows accurate tritium measurements without requiring that the sample be opened and subsampled, thus reducing personnel exposure and radioactive waste generation. The sensitivity limit is primarily due to response shifts caused by temperature fluctuation in the water bath. The fluctuations are most likely a combination of insufficient insulation from ambient air and precision limitations in the temperature controller. The sensitivity could probably be reduced to below 5 Ci if the following improvements were made: (1) Extend the external insulation to cover the entire bath and increase the top insulation. (2) Improve the seal between the air space above the bath and the outside air to reduce evaporation. This will limit the response drift as the water level drops. (3) Install an improved temperature controller, preferably with a built in chiller, capable of temperature control to {+-}0.001 C.

Rodgers, David E.

2002-12-17

322

Apparatus for and method of removing tile from a floor  

US Patent & Trademark Office Database

A method for removing tile adhered by a substance to a floor includes the step of enclosing a volume generally above an area of the floor and tile, with the tile and floor defining the bottom of the volume enclosed. The temperature in the volume enclosed is reduced so that the substance adhering the tile to the floor becomes embrittled. The apparatus is maintained in position over the area of the floor for a predetermined time to produce the required embrittlement of the adhering substance, and then moved to expose the area of the floor previously below the volume enclosed. The tile is then removed from the floor. An apparatus for use in the method is also disclosed.

Carter; David L. (St. Louis, MO); Simms; James B. (Wood River, IL)

1993-12-21

323

QCD and hadron structure.  

National Technical Information Service (NTIS)

I give a brief and selective overview of QCD as it pertains to determining hadron structure and the relevant directions in this field for nuclear theory. This document is intended to start discussion about priorities.

D. B. Kaplan

1995-01-01

324

Topics in Hadronic Physics  

SciTech Connect

Hadron production cross sections are calculated in the perturbative QCD frame work. Parton distribution functions are obtained from a strip-soliton model. The fragmentation functions are derived from the Lund model of string breaking.

Alfred Tang

2002-08-01

325

Hadronic Fluctuations and Correlations  

Microsoft Academic Search

This document is part of Volume 23 `Relativistic Heavy Ion Physics' of Landolt-Börnstein - Group I `Elementary Particles, Nuclei and Atoms'. It contains the Section `8.1 Hadronic Fluctuations and Correlations' of the Chapter `8 The Final Expansion State of Relativistic Nuclear Collisions' with the content: 8.1 Hadronic Fluctuations and Correlations 8.1.1 Introduction 8.1.2 Fluctuations and Correlations in a thermal system

Volker Koch

2010-01-01

326

Jets in hadronic reactions  

SciTech Connect

Recent experimental data on the properties of jets in hadronic reactions are reviewed and compared with theoretical expectations. Jets are clearly established as the dominant process for high E/sub T/ events in hadronic reactions. The cross section and the other properties of these events are in qualitative and even semiquantitative agreement with expectations based on perturbative QCD. However, we can not yet make precise tests of QCD, primarily because there are substantial uncertainties in the theoretical calculations. 45 references. (WHK)

Paige, F.E.

1983-01-01

327

Cone Calorimeter Evaluation of the Flammability of Composite Materials,  

National Technical Information Service (NTIS)

A study was undertaken to evaluate the fire performance of composite materials using the cone calorimeter as the bench-scale method of test simulating the thermal irradiance from fires of various magnitudes. Five parameters were derived from the calorimet...

J. E. Brown E. Braun W. H. Twilley

1988-01-01

328

High temperature calorimeter performance variable study  

SciTech Connect

Oak Ridge National Laboratory with funding supplied by the Department of Energy sponsored the evaluation of a water calorimeter for thermal transmission testing of refractory fiber insulation using a ruggedness test. The specimens tested were low density refractory fiber flexible blanket insulation. The factors evaluated included (1) emissivity of copper plate; (2) calorimeter to guard balance; (3) calorimeter to room temperature balance; (4) calorimeter water flow rate; (5) perimeter insulation; (6) type of hot side thermocouple and (7) type of cold side thermocouple. A ruggedness test is a statistical method of evaluating step changes making multiple changes each test. Five of the seven factors were found to be significant at a minimum of one temperature. One plate versus three plates, two inch thick specimen versus three inch thick specimen and a release agent were three factors that were tested independently of the ruggedness test. The specimens were also tested in a guarded hot plate for comparison purposes. Recommendations are given to improve the design and operation of the calorimeter.

Troyer, R.

1986-04-01

329

High temperature calorimeter performance variable study  

NASA Astrophysics Data System (ADS)

Oak Ridge National Laboratory with funding supplied by the Department of Energy sponsored the evaluation of a water calorimeter for thermal transmission testing of refractory fiber insulation using a ruggedness test. The specimens tested were low density refractory fiber flexible blanket insulation. The factors evaluated included: (1) emissivity of copper plate; (2) calorimeter to guard balance; (3) calorimeter to room temperature balance; (4) calorimeter water flow rate; (5) perimeter insulation; (6) type of hot side thermocouple, and (7) type of cold side thermocouple. A ruggedness test is a statistical method of evaluating step changes making multiple changes with each test. Five of the seven factors were found to be significant at a minimum of one temperature. One plate versus three plates, two inch thick specimen versus three inch thick specimen and a release agent were three factors that were tested independently of the ruggedness test. The specimens were also tested in a guarded hot plate for comparison purposes. Recommendations are given to improve the design and operation of the calorimeter.

Troyer, R.

1986-04-01

330

Performance of the AMS02 Electromagnetic Calorimeter in space  

NASA Astrophysics Data System (ADS)

The Alpha Magnetic Spectrometer (AMS-02) is a general purpose high energy particle detector which was successfully deployed on the International Space Station (ISS) on May 19, 2011 to conduct a long duration mission of fundamental physics research in space. After one year of operation, AMS-02 has collected more than 17 billions of events. The main scientific goals of the experiment are the searches for antimatter and dark matter, the high precision measurement of charged cosmic ray spectra and fluxes and the study of gamma rays, in the GeV to TeV energy range. In AMS-02, the Electromagnetic Calorimeter (ECAL) is required to measure e+, e- and gamma spectra and to discriminate electromagnetic showers from hadronic cascades. To fulfill these requirements the ECAL is based on a lead/scintillating fiber sandwich, providing a 3D imaging reconstruction of the showers. AMS-02 has been tested during Summer 2010 in a test beam at CERN, using 10 to 250 GeV electron and positron beams and proton beam at 400 GeV. After a summary of the AMS02 performance in space, results on the measurements of ECAL parameters and performance will be reviewed.

Rosier-Lees, Sylvie; AMS02 Collaboration

2012-12-01

331

A Moon-borne electromagnetic calorimeter  

NASA Astrophysics Data System (ADS)

We discuss an electromagnetic sampling calorimeter for the detection of very high energy gamma-rays on the Moon, which is based on the use of scintillating cylinders and plates imbedded in the lunar soil. The use of lunar soil as a calorimeter radiator reduces the weight of the material to be transported to the Moon and minimises environmental impact. Plastic scintillator bars inserted into the regolith about 1.5 m are the active elements of this instrument: at the surface, each bar is terminated by a plastic scintillator plate to veto high energy charge particles. The readout system for the scintillator bars and plates are based on recently developed single photon solid state detectors (Silicon Photomultiplier, SiPM), extremely compact, sturdy and sensitive devices suited for detecting small light pulses in a space experiment. The performance of a regolith-scintillator calorimeter is evaluated and the relevant parameters are optimised using a GEANT4 simulation.

Battiston, Roberto; Brunetti, Maria Teresa; Cervelli, Franco; Fidani, Cristiano; Menichelli, Mauro

2009-10-01

332

Temperature Effects in the ATIC BGO Calorimeter  

NASA Astrophysics Data System (ADS)

The Advanced Thin Ionization Calorimeter ATIC Balloon Experiment contains a segmented calorimeter composed of 320 individual BGO crystals 18 radiation lengths deep to determine the particle energy Like all inorganic scintillation crystals the light output of BGO depends not only on the energy deposited by particles but also on the temperature of the crystal ATIC had successful flights in 2000 2001 and 2002 2003 from McMurdo Antarctica The temperature of balloon instruments varies during their flights at altitude due to sun angle variations and differences in albedo from the ground and is monitored and recorded In order to determine the temperature sensitivity of the ATIC calorimeter the instrument was temperature cycled in the thermal vacuum chamber at the CSBF in Palestine TX The temperature dependence derived from the pulse height response to cosmic ray muons at various temperatures is discussed and compared to values in the literature

Isbert, J.; Wefel, J. P.; Atic Team

333

Nonuniformities in organic liquid ionization calorimeters  

SciTech Connect

Hermeticity and uniformity in SSC calorimeter designs are compromised by structure and modularity. Some of the consequences of the cryogenic needs of liquid argon calorimetry are relatively well known. If the active medium is an organic liquid (TMP, TMS, etc.), a large number of independent liquid volumes is needed for safety and for rapid liquid exchange to eliminate local contamination. Modular construction ordinarily simplifies fabrication, assembly, handling and preliminary testing at the price of additional walls, other dead regions and many nonuniformities. Here we examine ways of minimizing the impact of some generic nonuniformities on the quality of calorimeter performance. 6 refs., 7 figs.

Wenzel, W.A.

1989-06-01

334

Rad Hard Active Media For Calorimeters  

NASA Astrophysics Data System (ADS)

Zero-degree calorimeters have limited space and extreme levels of radiation. A simple, low cost, radiation hard design uses tungsten metal as the absorber and a suitable liquid as the ?erenkov radiator. In other applications a PPAC (Parallel Plate Avalanche Counter) operating with a suitable atmospheric-pressure gas is an attractive active material for a calorimeter. It can be made radiation hard and has sufficient gain in the gas that no electronic components are needed near the detector. It works well even with the highest concentration of shower particles. For this pressure range, R134A (used in auto air conditioners) has many desirable features.

Norbeck, E.; Olson, J. E.; Moeller, A.; Onel, Y.

2006-10-01

335

Demonstration of state-locked control of tiled system  

NASA Astrophysics Data System (ADS)

The stability of phased-array optics is a crucial issue for far-field focal-spot quality. The tiled approach of phasing optical elements is a widely used technique. Here it is adopted to maintain the long-time stability of a tiled system by a proportional-integral-differential (PID) algorithm. Experimental data is taken with 2×1 tiled-flat square mirrors driven by 3-axis piezoelectric actuators. The feedback frequency is over 80 Hz and the displacement error is below 4 nm. The optical measurement results show that the state-locked operation is continuously maintained for hour-long periods in PID control mode.

Yang, Yuchuan; Wang, Xiao; Zhang, Junwei; Luo, Hui; Li, Fuquan; Huang, Xiaojun; Jing, Feng

2011-09-01

336

Hadronization of partons  

SciTech Connect

The description of inclusive production of single unpolarized light hadrons using fragmentation functions in the framework of the factorization theorem is reviewed. The factorization of observables into perturbatively calculable quantities and these universal fragmentation functions are summarized and some improvements beyond the standard fixed order approach are discussed. The extraction of fragmentation functions for light charged ({pi}{sup {+-}}, K{sup {+-}}, and p/p) and neutral (K{sub S}{sup 0} and {Lambda}/{Lambda}) hadrons using these theoretical tools is discussed through global fits to experimental data from reactions at various colliders, in particular from accurate e{sup +}e{sup -} reactions at the Large Electron-Position Collider (LEP), and the subsequent successful predictions of other experimental data, such as data gathered at Hadron Electron Ring Accelerator (HERA), the Tevatron, and the Relativistic Heavy Ion Collider (RHIC), from these fitted fragmentation functions as allowed by factorization universality. These global fits also impose competitive constraints on {alpha}{sub s}(M{sub Z}). Emphasis is placed on the need for accurate data from pp(p) and ep reactions in which the hadron species is identified in order to constrain the separate fragmentation functions of the gluon and each quark flavor for each hadron species.

Albino, S. [II. Institut fuer Theoretische Physik, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg (Germany)

2010-07-15

337

QCD based model of hadron-hadron scattering  

SciTech Connect

The leading log approximation to Quantum Chromodynamics is derived, including the effects of gluon spin. The use of the leading log approximation in simulating Quantum Chromodynamic events is described. Models for the formation of hadrons from quarks and gluons are reviewed. A model for hadron-hadron scattering, using the leading log approximation and a particular model for hadron formation is described. This model is used to study the results of calorimetric experiments.

Shatz, M.P.

1984-01-01

338

Nonextensivity of hadronic systems  

NASA Astrophysics Data System (ADS)

The predictions from a nonextensive self-consistent theory recently proposed are investigated. Transverse momentum (pT) distribution for several hadrons obtained in p+p collisions are analyzed to verify if there is evidence for a limiting effective temperature and a limiting entropic index. In addition, the hadron-mass spectrum proposed in that theory is confronted with available data. It turns out that all pT distributions and the mass spectrum obtained in the theory are in good agreement with experiment with constant effective temperature and constant entropic index. The results confirm that the nonextensive statistics plays an important role in the description of the termodynamics of hadronic systems, and also that the self-consistent principle holds for energies as high as those achieved in the LHC. A discussion on the best pT-distribution formula for fitting experimental data is presented.

Marques, L.; Andrade-II, E.; Deppman, A.

2013-06-01

339

Heavy Flavor Hadron Molecules  

SciTech Connect

We discuss the interpretation of the open charm mesons D{sub s0}{sup *}(2317), D{sub s1}(2460) and the hidden charm meson X(3872) as hadron molecules. Using a phenomenological Lagrangian approach we consider strong and radiative decays of the D{sub s0}{sup *}(2317) and D{sub s1}(2460) states. The X(3872) is assumed to consist dominantly of molecular hadronic components with an additional small admixture of a charmonium configuration. A potential model based on meson-exchange is able to generate weak binding of the molecular hadronic components. The observed radiative ({gamma}J/{psi} and {gamma}{psi}(2s)) and strong (J/{psi}2{pi} and J/{psi}3{pi}) decays are shown to be consistent with the molecular structure assumption of the X(3872).

Gutsche, Thomas; Lyubovitskij, Valery E. [Institut fuer Theoretische Physik, Universitaet Tuebingen, Kepler Center for Astro and Particle Physics, Auf der Morgenstelle 14, D-72076 Tuebingen (Germany)

2010-12-28

340

Long-Drift Techniques for Calorimeters.  

National Technical Information Service (NTIS)

There are several advantages that can be expected from the use of long-drift chambers as the sensitive element in gas-sampling calorimeters in place of closely-spaced proportional cells. These advantages include a sharply reduced number of wires to read o...

L. E. Price

1982-01-01

341

The ZEUS calorimeter first level trigger  

Microsoft Academic Search

The design of the ZEUS Calorimeter First Level Trigger (CFLT) is presented. The CFLT utilizes a pipelined architecture to provide trigger data for a Global First Level Trigger decision 5 ?s after each beam crossing, occurring every 96 ns. The charges from 13 K phototubes are summed into 1792 trigger tower pulseheights which are digitized by flash ADCs. The digital

W. H. Smith; I. Ali; B. Behrens; C. Fordham; C. Foudas; A. Goussiou; M. Jaworski; T. Kinnel; J. Lackey; P. Robl; S. Silverstein; J. W. Dawson; D. A. Krakauer; R. L. Talaga; J. L. Schlereth

1995-01-01

342

Energy flow with high granularity calorimeters  

NASA Astrophysics Data System (ADS)

In order to perform high precision measurements as well as search for new phenomena at a next Linear Collider, excellent ENERGY FLOW is mandatory. High granularity calorimeters design will fulfill the requests and preliminary results are presented as well as further directions to reach the final performances. .

Gay, P.

2001-07-01

343

SLD liquid argon calorimeter prototype test results  

SciTech Connect

The results of the SLD test beam program for the selection of a calorimeter radiator composition within a liquid argon system are described, with emphasis on the study of the use of uranium to obtain equalization of pion and electron responses.

Dubois, R.; Eigen, G.; Au, Y.; Sleeman, J.; Breidenbach, M.; Brau, J.; Ludgate, G.A.; Oram, C.J.; Cook, V.; Johnson, J.

1985-10-01

344

Grout Analysis for EC and CC Calorimeters  

SciTech Connect

The EC and CC calorimeters roll on Two parallel hardened steel ways which reside on the top of the D0 platform's center beam. The ways will be grouted to the center beam once their correct elevation has been established. The purpose of this report is to evaluate and compare three different epoxy grouts and their properties for this application.

Engstrom, L.L.; /Fermilab

1987-01-06

345

Flavourful hadronic physics.  

SciTech Connect

We review theoretical approaches to form factors that arise in heavy-meson decays and are hadronic expressions of non-perturbative QCD. After motivating their origin in QCD factorisation, we retrace their evolution from quark-model calculations to non-perturbative QCD techniques with an emphasis on formulations of truncated heavy-light amplitudes based upon Dyson-Schwinger equations. We compare model predictions exemplarily for the F{sup B {yields} {pi}}(q{sup 2}) transition form factor and discuss new results for the g{sub D*D{pi}}coupling in the hadronic D* decay.

El-Bennich, B.; Ivanov, M. A.; Roberts, C. D. (Physics); (Bogoliubov Lab. of Theoretical Phys.); (Peking Univ.)

2010-02-01

346

Cheshire Cat hadrons  

NASA Astrophysics Data System (ADS)

This article is based on a series of lectures given at ELAF 93 on the description of low-energy hadronic systems in and out of hadronic medium. The focus is put on identifying, with the help of a Cheshire Cat philosophy, the effective degrees of freedom relevant for the strong interactions from a certain number of generic symmetry properties of QCD. The matters treated are the ground-state and excited-state properties of light- and heavy-quark baryons and applications to nuclei and nuclear matter under normal as well as extreme conditions.

Rho, Mannque

1994-05-01

347

Construction and test of a 1×1 m2 Micromegas chamber for sampling hadron calorimetry at future lepton colliders  

NASA Astrophysics Data System (ADS)

Sampling calorimeters can be finely segmented and used to detect showers with high spatial resolution. This imaging power can be exploited at future linear collider experiments where the measurement of jet energy by a Particle flow method requires optimal use of tracking and calorimeter information. Gaseous detectors can achieve high granularity and a hadron sampling calorimeter using Micromegas chambers as active elements is considered in this paper. Compared to traditional detectors using wires or resistive plates, Micromegas is free of space charge effects and could therefore show superior calorimetric performance. To test this concept, a prototype of 1×1 m2 equipped with 9216 readout pads of 1×1 cm2 has been built. Its technical and basic operational characteristics are reported.

Adloff, C.; Blaha, J.; Chefdeville, M.; Dalmaz, A.; Drancourt, C.; Espargilière, A.; Gaglione, R.; Geffroy, N.; Girard, D.; Jacquemier, J.; Karyotakis, Y.; Koletsou, I.; Peltier, F.; Samarati, J.; Tsigaridas, S.; Tsipolitis, G.; Vouters, G.

2013-11-01

348

Hadron Therapy for Cancer Treatment  

ScienceCinema

The biological and physical rationale for hadron therapy is well understood by the research community, but hadron therapy is not well established in mainstream medicine. This talk will describe the biological advantage of neutron therapy and the dose distribution advantage of proton therapy, followed by a discussion of the challenges to be met before hadron therapy can play a significant role in treating cancer. A proposal for a new research-oriented hadron clinic will be presented.

349

Measurement of Tritium Surface Distribution on TFTR Bumper Limiter Tiles  

SciTech Connect

The tritium surface distribution on graphite tiles used in the Tokamak Fusion Test Reactor (TFTR) bumper limiter and exposed to TFTR deuterium-tritium (D-T) discharges from 1993 to 1997 was measured by the Tritium Imaging Plate Technique (TIPT). The TFTR bumper limiter shows both re-/co-deposition and erosion. The tritium images for all tiles measured are strongly correlated with erosion and deposition patterns, and long-term tritium retention was found in the re-/co-depositions and flakes. The CFC tiles located at erosion dominated areas clearly showed their woven structure in their tritium images owing to different erosion yields between fibers and matrix. Significantly high tritium retention was observed on all sides of the erosion tiles, indicating carbon transport via repetition of local erosion/deposition cycles.

K. Sugiyama; T. Tanabe; C.H. Skinner; C.A. Gentile

2004-06-28

350

35. DETAIL INTERIOR VIEW OF TILE DECORATION ON WALL OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

35. DETAIL INTERIOR VIEW OF TILE DECORATION ON WALL OF POWERHOUSE #1 ON LEVEL +55; THE WINDOWS LOOK OUT ON DISCHARGE CHANNEL DOWNSTREAM FROM POWERHOUSE. - Bonneville Project, Powerhouse No.1, Spanning Bradford Slough, from Bradford Island, Bonneville, Multnomah County, OR

351

24. DETAIL VIEW OF TILE GAUGE IN INTERMEDIATE LOCK WALL, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

24. DETAIL VIEW OF TILE GAUGE IN INTERMEDIATE LOCK WALL, LOOKING NORTHEAST. NOTE STEEL WALL ARMOR EMBEDDED IN CONCRETE. - Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26, Alton, Madison County, IL

352

ROOM 8, WITH TILED LIGHT TRAP DOORWAY TO ADJOINING DARKROOM, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

ROOM 8, WITH TILED LIGHT TRAP DOORWAY TO ADJOINING DARKROOM, AND PASS THROUGH IN WALL - Hamilton Field, Photographic Laboratory, Seventh Street between Escolta & Hangar Avenues, Novato, Marin County, CA

353

12. FIREPLACE: TILES AND CARVED WOOD PANEL. IN THE LATTER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

12. FIREPLACE: TILES AND CARVED WOOD PANEL. IN THE LATTER READS THE WORDS OF THE MORRIS FAMILY'S HOMES: CEDAR GROVE, A.D. 1774 AND COMPTON, A.D. 1887. - Compton, Meadowbrook Avenue, Philadelphia, Philadelphia County, PA

354

Self-glazing ceramic tiles based on acidic igneous glasses  

SciTech Connect

A technology was derived to produce self-glazing ceramic tiles based on single-component systems of acidic igneous (volcanic) glasses. A weakly alkaline solution of NaOH or KOH was used as the sealing water to activate the sintering process. Tests conducted on the self-glazing ceramic tiles showed that their water absorption amounts to 2.5-8%, linear shrinkage is 3.2-7%, and frost resistance amounts to 35-70 cycles. The application of acidic igneous glasses as the main raw material for the production of ceramic facing tiles made it possible to widen the raw material base and simplify the technology for fabricating ceramic facing tiles at lower cost. The use of waste products when processing perlite-bearing rocks, when carrying out mining and cutting of tuffs, slags, and tuff breccia for recovering cut materials was recommended.

Merkin, A.P.; Nanazashvili, V.I.

1988-07-01

355

Physics at future Hadron Colliders  

Microsoft Academic Search

We discuss the physics opportunities and detector challenges at future hadron colliders. As guidelines for energies and luminosities we use the proposed luminosity and\\/or energy upgrade of the LHC (SLHC), and the Fermilab design of a Very Large Hadron Collider (VLHC). We illustrate the physics capabilities of future hadron colliders for a variety of new physics scenarios (supersymmetry, strong electroweak

S. Belyaev; M. Bosman; G. Brooijmans; I. Gaines; S. Godfrey; J. B. Hansen; J. Hauser; U. Heintz; I. Hinchliffe; C. Kao; G. Landsberg; F. Maltoni; C. Oleari; C. Pagliarone; F. Paige; T. Plehn; D. Rainwater; L. Reina; T. Rizzo; S. Su; T. M. P. Tait; D. Wackeroth; E. Vataga; D. Zeppenfeld

2002-01-01

356

Hadronic Physics at Jefferson Lab  

SciTech Connect

I describe some of the lattice QCD work in support of the hadronic physics program at Jefferson Lab. In particular, there is a strong emphasis on the determination of the excited state hadron spectrum, as well as determining the spin content of nucleons and other hadrons.

Edwards, Robert

2008-05-01

357

Mobilization and loss of elements from roofing tiles  

Microsoft Academic Search

Deposition, leaching and chemical transformation are processes that affect roofing tile and roof runoff water. Leaching experiments,\\u000a with artificial rainwater in the laboratory, showed the presence of Na+, K+, Mg2+, Ca2+, Cl?, NO3\\u000a ?, SO4\\u000a 2?, with a ratio of Ca2+ and SO4\\u000a 2? suggesting gypsum dissolution. X-ray fluorescence (XRF) of the exposed roof tile showed depletion such as Mg,

Fazrul Razman Sulaiman; Peter Brimblecombe; Carlota M. Grossi

2009-01-01

358

Hardware Algorithms For Tile-Based Real-Time Rendering  

Microsoft Academic Search

In this dissertation, we present the GRAphics AcceLerator (GRAAL) framework for developing embedded tile-based rasterization hardware for mobile devices, meant to accelerate real-time 3-D graphics (OpenGL compliant) applications. The goal of the framework is a low-cost, low-power, high-performance design that delivers good image quality. We focus on several key problem areas in tile-based rasterization, such as: rasterization and triangle traversal,

D. Crisu

2012-01-01

359

New Perspectives on Forbidden Symmetries, Quasicrystals, and Penrose Tilings  

Microsoft Academic Search

Quasicrystals are solids with quasiperiodic atomic structures and symmetries forbidden to ordinary periodic crystals--e.g., 5-fold symmetry axes. A powerful model for understanding their structure and properties has been the two-dimensional Penrose tiling. Recently discovered properties of Penrose tilings suggest a simple picture of the structure of quasicrystals and shed new light on why they form. The results show that quasicrystals

Paul J. Steinhardt

1996-01-01

360

Random tilings with quasicrystal order: transfer-matrix approach  

Microsoft Academic Search

The random tiling of the plane by a set of objects (e.g., rhombi), related by rotational (e.g. tenfold) symmetries, is a paradigm for the formation of quasiperiodic order due to entropy. Such tilings are mapped to a higher-dimensional space where they form hypersurfaces analogous to the interfaces in a solid-on-solid model. The author argues that the fluctuations of the hypersurface

C. L. Henley

1988-01-01

361

On the Minimum Weight Steiner Triangular Tiling problem  

SciTech Connect

In this paper, we introduce the Minimum Weight Steiner Triangular Tiling problem, which is a generalization of the Minimum Weight Steiner Triangulation. Contrary to the conjecture of Eppstein that the Minimum Weight Steiner Triangulation of a convex polygon has the property that the Steiner points all lie on the boundary of the polygon [Epp94], we show that the Steiner points of a Minimum Weight Steiner Triangular Tiling could lie in the interior of a convex polygon.

Doddi, S.; Zhu, B.

1995-04-01

362

Measurement of the Hadronic Photon-Structure Function at LEP 1 for $l$Angle$Q^{2}$ $r$Angle Values between 9.9 and 284 $GeV^{2}$  

Microsoft Academic Search

Inclusive gamma^*gamma interactions to hadronic final states where one scattered electron or positron is detected in the electromagnetic calorimeters have been studied in the LEP 1 data taken by ALEPH from 1991 to 1995. The event sample has been used to measure the hadronic structure function of the photon F_2^gamma in three bins with of 9.9, 20.7 and 284

R Barate; D Décamp; P Ghez; C Goy; J P Lees; E Merle; M N Minard; B Pietrzyk; R Alemany; M P Casado; M Chmeissani; J M Crespo; E Fernández; M Fernández-Bosman; L Garrido; E Graugès-Pous; A Juste; M Martínez; G Merino; R Miquel; L M Mir; A Pacheco; I C Park; I Riu; A Colaleo; D Creanza; M De Palma; G Gelao; Giuseppe Iaselli; G Maggi; M Maggi; S Nuzzo; A Ranieri; G Raso; F Ruggieri; G Selvaggi; L Silvestris; P Tempesta; A Tricomi; G Zito; X Huang; J Lin; Q Ouyang; T Wang; Y Xie; R Xu; S Xue; J Zhang; L Zhang; W Zhao; D Abbaneo; U Becker; G Boix; M Cattaneo; F Cerutti; V Ciulli; G Dissertori; H Drevermann; Roger W Forty; M Frank; A W Halley; J B Hansen; J Harvey; P Janot; B Jost; Ivan Lehraus; O Leroy; P Mato; Adolf G Minten; A Moutoussi; F Ranjard; Luigi Rolandi; D Rousseau; W D Schlatter; M Schmitt; O Schneider; P Spagnolo; W Tejessy; F Teubert; I R Tomalin; E Tournefier; Ziad J Ajaltouni; F Badaud; G Chazelle; O Deschamps; A Falvard; C Ferdi; P Gay; C Guicheney; P Henrard; J Jousset; B Michel; S Monteil; J C Montret; D Pallin; P Perret; F Podlyski; J D Hansen; J R Hansen; P H Hansen; B S Nilsson; B Rensch; A Wäänänen; G Daskalakis; A Kyriakis; C Markou; Errietta Simopoulou; I Siotis; Anna Vayaki; A Blondel; G R Bonneaud; J C Brient; A Rougé; M Rumpf; M Swynghedauw; M Verderi; H L Videau; E Focardi; G Parrini; K Zachariadou; R J Cavanaugh; M Corden; C H Georgiopoulos; A Antonelli; G Bencivenni; G Bologna; F Bossi; P Campana; G Capon; V Chiarella; P Laurelli; G Mannocchi; F Murtas; G P Murtas; L Passalacqua; M Pepé-Altarelli; L Curtis; J G Lynch; P Negus; V O'Shea; C Raine; P Teixeira-Dias; A S Thompson; O L Buchmüller; S Dhamotharan; C Geweniger; P Hanke; G Hansper; V Hepp; E E Kluge; A Putzer; J Sommer; K Tittel; S Werner; M Wunsch; R Beuselinck; David M Binnie; W Cameron; Peter J Dornan; M Girone; S M Goodsir; E B Martin; N Marinelli; A Sciabà; J K Sedgbeer; E Thomson; M D Williams; V M Ghete; P Girtler; E Kneringer; D Kuhn; G Rudolph; C K Bowdery; P G Buck; A J Finch; F Foster; G Hughes; R W L Jones; N A Robertson; I Giehl; K Jakobs; K Kleinknecht; G Quast; B Renk; E Rohne; H G Sander; H W Wachsmuth; C Zeitnitz; Jean-Jacques Aubert; C Benchouk; A Bonissent; J Carr; P Coyle; F Etienne; A Ealet; F Motsch; P Payre; M Talby; M Thulasidas; M Aleppo; M Antonelli; F Ragusa; V Büscher; H Dietl; G Ganis; K Hüttmann; G Lütjens; C Mannert; W Männer; H G Moser; S Schael; Ronald Settles; H C J Seywerd; H Stenzel; W Wiedenmann; G Wolf; J Boucrot; O Callot; S Chen; A Cordier; M Davier; L Duflot; J F Grivaz; P Heusse; A Jacholkowska; F R Le Diberder; J Lefrançois; A M Lutz; M H Schune; J J Veillet; I Videau; D Zerwas; P Azzurri; G Bagliesi; S Bettarini; T Boccali; C Bozzi; G Calderini; R Dell'Orso; R Fantechi; I Ferrante; L Foà; A Giassi; A Gregorio; F Ligabue; A Lusiani; P S Marrocchesi; A Messineo; Fabrizio Palla; G Rizzo; G Sanguinetti; G Sguazzoni; Roberto Tenchini; C Vannini; A Venturi; P G Verdini; G A Blair; J T Chambers; G D Cowan; M G Green; T Medcalf; J A Strong; J H Von Wimmersperg-Töller; David R Botterill; R W Clifft; T R Edgecock; P R Norton; J C Thompson; A E Wright; B Bloch-Devaux; P Colas; S Emery; Witold Kozanecki; E Lançon; M C Lemaire; E Locci; P Pérez; J Rander; J F Renardy; A Roussarie; J P Schuller; J Schwindling; A Trabelsi; B Vallage; S N Black; J H Dann; R P Johnson; H Y Kim; N P Konstantinidis; A M Litke; M A McNeil; G Taylor; C N Booth; S L Cartwright; F Combley; M S Kelly; M H Lehto; L F Thompson; K Affholderbach; A Böhrer; S Brandt; J Foss; Claus Grupen; G Prange; L Smolik; F Stephan; G Giannini; B Gobbo; J E Rothberg; S R Wasserbaech; S R Armstrong; E Charles; P Elmer; D P S Ferguson; Y Gao; S González; T C Greening; O J Hayes; H Hu; S Jin; G Mamier; P A McNamara; J M Nachtman; J Nielsen; W Orejudos; Y B Pan; Y Saadi; I J Scott; M Vogt; J Walsh; Wu Sau Lan; X Wu; G Zobernig

1999-01-01

363

TECHNICAL DESIGN REPORT FOR A NOSECONE CALORIMETER (NCC) FOR THE PHENIX EXPERIMENT.  

SciTech Connect

A remarkable result has emerged from the first several years of data taking at RHIC--the high temperature and density phase of QCD matter created in heavy ion collisions at RHIC is best described as a near perfect fluid--the strongly interacting Quark-Gluon-Plasma (sQGP). This state is characterized by a small viscosity to entropy ratio, and a high density of color charges which induces huge energy losses of partons transversing the medium. The task for the future is to understand the characteristics of the sQGP, and perhaps more importantly--to gain some insight into how and why such a medium is created. The PHENIX detector has been one of the primary experimental tools at RHIC; in particular the electromagnetic calorimeter has been a critical component of many of the measurements leading to this discovery. The coverage of the present PHENIX electromagnetic calorimeter is rather limited, covering half the azimuth and -0.35< {eta} <0.35 Further progress requires larger coverage of electromagnetic calorimetry, both to increase the rate for low cross section phenomena, and to cover a broader range of pseudorapidity to study the rapidity dependence of the medium. A pair of Nosecone Calorimeters (NCC) has been designed covering both positive and negative rapidity regions 1< |{eta}| <3 of the PHENIX detector. The NCC will make it possible to perform tomographic studies of the jet energy dependence of energy loss and medium response, by using direct photons as trigger particles over a large rapidity range. The technique of correlating trigger hadrons with low momentum hadrons has been powerfully exploited at RHIC to study the evolution of back to back jets [1, 2] and hence the response of the medium. The NCC will make it possible to do such studies using direct photons as the trigger particles. The direct photon in such ''photon-jet'' events tags the transverse momentum of outgoing parton which then fragments into lower energy particles. Together with the Forward Silicon Vertex detector (FVTX), the NCC will make PHENIX a large acceptance spectrometer, capable of detecting photons, electrons, muons, and hadrons. Our prime motivation is to provide precision measurements of direct photons, {pi}{sup 0}s and dielectrons in A+A, p(d)+A, and polarized p+p collisions. The upgrade will provide access to physics observables that are not currently accessible to PHENIX or that are now available only indirectly with very limited accuracy.

PHENIX EXPERIMENT; OBRIEN,E.; BOOSE, S.; CHIU, M.; JOHNSON, B.M.; KISTENEV, E.P.; LYNCH, D.; NOUICER, R.; PAK, R.; PISANI, R.; STOLL, S.P.; SUKHANOV, A.; WOODY, C.L.; LI, Z.; RADEKA, V.; RESCIA, S.; (PHENIX EXPERIMENT COLLABORATORS)

2007-08-01

364

Detailed Tritium Distribution on the JET MK IIA Divertor Tiles  

SciTech Connect

Tritium surface distributions on the plasma-facing surface and four sides of JET Mk IIA divertor tiles employed in the D-T operation phase of JET were measured by Tritium Imaging Plate Technique (TIPT). Tritium distribution on the plasma-facing surface was consistent with carbon deposition profiles and asymmetric in both poloidal and toroidal directions. The toroidal asymmetry was attributed to the alignment of the tiles preventing direct impact of flux lines to tile edges. Accordingly, no significant carbon deposition or tritium accumulation was observed on two sides facing the toroidal direction. As already reported, heavy codeposition retaining high levels of tritium was observed on the plasma-shadow area of the horizontal target tile surface and the bottom side of the vertical target tile of the inner divertor region where it was kept relatively cool by water coolant. In addition, TIPT has clearly distinguished at least two different carbon deposition layers with different tritium retention in poloidal direction, showing that the poloidal asymmetry on the horizontal target tiles is due to the different carbon deposition properties in the poloidal direction. All the results suggest that tritium retention in the divertor area, which was determined by the carbon/hydrocarbon distribution, correlates closely with divertor geometry and surface temperature.

Sugiyama, K. [Nagoya University (Japan); Tanabe, T. [Nagoya University (Japan); Bekris, N. [Forschungszentrum Karlsruhe (Germany); Glugla, M. [Forschungszentrum Karlsruhe (Germany); Coad, J.P. [Culham Science Centre (United Kingdom)

2005-07-15

365

Structural testing of clay tile walls testing and evaluation program  

SciTech Connect

Martin Marietta Energy Systems, inc. is conducting a comprehensive program to assess the safety of critical Department of Energy facilities to natural phenomena hazards. Many of these facilities at the Oak Ridge Y-12 Plant were constructed in the mid to late 1940s and are comprised of unreinforced hollow clay tile infilled steel frames.The assessment of these facilities includes the development of a rational method of evaluating hollow clay tile infilled frame structures subjected to seismic forces. This document provides guidance for the various testing and analysis activities to be performed in the development of the evaluation methodology. This document contains a review of literature pertaining to masonry infilled steel frames, preliminary analysis of infilled frame structures, a discussion of applicable destructive andnondestructive testing procedures for hollow clay tile, and a description of numerical analysis tasks for hollow clay tile structures. The physical testing procedures are broadly divided into three categories: existing conditions, material properties and system behavior. The state of knowledge of hollow clay tile infilled frame behavior as ft exists near the beginning of the testing and evaluation program is presented. As the evaluation program continues and more is learned about the behavior of hollow clay tile infills, portions of this document may be outdated and/or superseded. The concepts of this document will evolve as the testing and evaluation program unfolds.

Bennett, R.M. [Tennessee Univ., Knoxville, TN (United States). Dept. of Civil Engineering; Flanagan, R.D. [Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States)

1992-03-16

366

Hadronization of expanding QGP  

Microsoft Academic Search

.  We discuss how the dynamics of an exploding hot fireball of quark-gluon matter impacts the actual phase transition conditions\\u000a between the deconfined and confined state of matter. We survey the chemical conditions prevailing at hadronization.

Johann Rafelski; Jean Letessier

2006-01-01

367

The Large Hadron Collider  

Microsoft Academic Search

The Large Hadron Collider (LHC), now close to completion at CERN will provide proton proton collisions with unprecedented luminosity and energy. It will allow the Standard Model of physics to be explored in an energy range where new phenomena can be studied. This includes the validity of the Higgs mechanism, supersymmetry and CP violation. The machine presents a number of

Lyndon Evans

2007-01-01

368

Really Large Hadron Colliders  

Microsoft Academic Search

This paper presents two possible approaches to a post-LHC hadron collider. The parameters and some of the accelerator physics issues of the two designs are discussed, followed by comments on the challenges involved in the technical systems. Major issues for further study and R&D are listed in the conclusion. I. INTRODUCTION In this paper, a \\

G. Dugan

369

Hadronic Physics: an Outlook  

SciTech Connect

A brief outlook, in two senses, is presented for hadronic physics. The likely near term future for experiment and lattice effort is sketched and I speculate on future directions in theory. I also look out at other fields, presenting a short review of QCD ideas in ''Beyond the Standard Model'' physics.

Swanson, Eric S. [Dept of Physics and Astronomy, University of Pittsburgh, Pittsburgh PA 15260 (United States)

2010-08-05

370

Study of some optical glues for the Compact Muon Solenoid at the large hadron collider of CERN  

Microsoft Academic Search

Two Avalanche Photodiodes will measure the light produced in each of the 61,200 PbWO4 crystals composing the barrel part of the electromagnetic calorimeter of the Compact Muon Solenoid (CMS) at the Large Hadron Collider of CERN. To improve the collection of the photons, these detectors will be glued to the crystal. To be used in CMS, the optical glue must

Marco Montecchi; Quentin Ingram

2001-01-01

371

A matched filter system for muon detection with Tilecal  

Microsoft Academic Search

In this paper, muon detection with the hadronic calorimeter of ATLAS, Tile calorimeter, is developed using an optimal filter system. Using experimental data from recent testbeam periods, a detection efficiency of 93.5% is achieved for a false alarm probability of 10%. This outperforms classical methods currently being used.

R. R. Ramos; J. M. Seixas; A. S. Cerqueira

2004-01-01

372

A FOrward CALorimeter Upgrade For PHENIX  

SciTech Connect

Over the past few years, the PHENIX detector has undergone several upgrades in the forward region (1<|{eta}|<4), initially covered only by the muon arms. The focus of these upgrades is toward a better understanding of the Color-Glass Condensate and the interplay between the different components of the proton's spin valence/sea quark and gluon contributions. This paper highlights the newly proposed forward calorimeter detector, FOCAL. FOCAL is a tungsten-silicon sampling calorimeter with high position and energy resolution, covering a pseudorapidity of 1.6<{eta}<2.5. This future detector aims to constrain the current view of gluon saturation at small x in the Color-Glass Condensate framework, through isolation of direct photons at high-p{sub T} over a broad range of pseudorapidity.

Hollis, Richard S. [Dept. Physics and Astronomy, University of California, Riverside, CA 92521 (United States)

2011-06-01

373

Upgrade plans for the D0 calorimeter  

SciTech Connect

The D{null} detector, a large collider detector located at the Fermi National Accelerator Laboratory, has begun implementing a major detector upgrade in anticipation of the completion of the Main Injector project at the Fermilab Tevatron. The calorimeter readout has been redesigned in order to accommodate the factor of {approx} 10 increase in instantaneous luminosity and the decrease in the inter- bunch separation. Our means of dealing with the increased event rate, along with our plan for controlling overall noise levels in the calorimeter, are discussed. We also present a brief overview of the design for the detector upgrade, including a discussion of some on the more cogent physics topics that will be accessible with the factor of {approx} 20 increase over the present data sample.

Kotcher, J. [Brookhaven National Lab., Upton, NY (United States)

1996-08-01

374

Hermeticity of three cryogenic calorimeter geometries  

SciTech Connect

We calculate the effect of cracks and dead material on resolution in three simplified cryogenic calorimeter geometries, using a crude approximation that neglects transverse shower spreading and considers only a small set of incident angles. For each dead region, we estimate the average unseen energy using a shower parametrization, and relate it to resolution broadening using a simple approximation that agrees with experimental data. Making reasonable and consistent assumptions on cryostat wall thicknesses, we find that the effects of cracks and dead material dominate the expected resolution in the region where separate ''barrel'' and ''end'' cryostats meet. This is particularly true for one geometry in which the end calorimeter caps the barrel and also protrudes into the hole within it. We also find that carefully designed auxiliary ''crack filler'' detectors can substantially reduce the loss of resolution in these areas. 6 figs.

Strovink, M.; Wormersley, W.J.; Forden, G.E.

1989-04-01

375

Level-2 Calorimeter Trigger Upgrade at CDF  

SciTech Connect

The CDF Run II Level-2 calorimeter trigger is implemented in hardware and is based on an algorithm used in Run I. This system insured good performance at low luminosity obtained during the Tevatron Run II. However, as the Tevatron instantaneous luminosity increases, the limitations of the current system due to the algorithm start to become clear. In this paper, we will present an upgrade of the Level-2 calorimeter trigger system at CDF. The upgrade is based on the Pulsar board, a general purpose VME board developed at CDF and used for upgrading both the Level-2 tracking and the Level-2 global decision crate. This paper will describe the design, hardware and software implementation, as well as the advantages of this approach over the existing system.

Flanagan, G.U.; /Purdue U.

2007-04-01

376

The dry heat exchanger calorimeter system  

SciTech Connect

A radiometric isothermal heat flow calorimeter and preconditioner system that uses air instead of water as the heat exchange medium has been developed at Mound. The dry heat exchanger calorimeter is 42 inches high by 18 inches in diameter and the preconditioner is a 22 inch cube, making it extremely compact compared to existing units. The new system is ideally suited for transportable, stand-alone, or glovebox applications. Preliminary tests of the system have produced sample measurements with standard deviations less than 0.25% and sample errors less than 0.50%. These tests have shown that the dry heat exchanger system will yield acceptance data with an accuracy comparable to those of Mound water bath systems now in use. 4 figs., 1 tab.

Renz, D.P.; Wetzel, J.R.; James, S.J.; Kasperski, P.W.; Duff, M.F.

1991-01-01

377

The electromagnetic calorimeter of the NOMAD experiment  

Microsoft Academic Search

A description is given of the NOMAD electromagnetic calorimeter, consisting of 875 lead-glass counters read out by two-stage photomultipliers and a low noise electronic chain. The detector operates in a 0.4 T magnetic field transverse to the counter axis. The paper discusses the design criteria, the lead-glass characteristics, the properties of the read out chain and provides a summary of

D. Autiero; M. Baldo-Ceolin; G. Barichello; V. Bianchi-Bonaiti; F. Bobisut; A. Cardini; P. W. Cattaneo; V. Cavasinni; C. Conta; T. Del Prete; A. De Santo; L. Di Lella; R. Ferrari; V. Flaminio; M. Fraternali; D. Gibin; S. N. Gninenko; A. Guglielmi; E. Iacopini; A. V. Kovzelev; L. La Rotonda; A. Lanza; M. Laveder; C. Lazzeroni; M. Livan; M. Mezzetto; D. Orestano; F. Pastore; E. Pennacchio; R. Petti; G. Polesello; G. Renzoni; A. Rimoldi; C. Roda; A. Sconza; C. Sobczynski; M. Valdata-Nappi; M. Vascon; V. Vercesi; L. Visentin; S. A. Volkov

1996-01-01

378

Troubleshooting guide for Mound calorimeter systems  

SciTech Connect

This report is to be used as a tool for troubleshooting Mound calorimeter systems. It describes in simple language the equilibration, prediction, and servo-control modes of operation. A problem-cause-action table provides suggestions and, in some cases, directs personnel to one of six troubleshooting flow charts included in the report. Using the flow charts, laboratory personnel should be able to rcognize and troubleshoot most problems that occur. 4 figs., 1 tab.

Breakall, K.L.; Duff, M.F.; Rodenburg, W.W.

1988-06-29

379

Measurement of Hadronic Event Shapes and Jet Substructure in Proton-Proton Collisions at 7.0 TeV Center-of-Mass Energy with the ATLAS Detector at the Large Hadron Collider  

SciTech Connect

This thesis presents the first measurement of 6 hadronic event shapes in proton-proton collisions at a center-of-mass energy of {radical}s = 7 TeV using the ATLAS detector at the Large Hadron Collider. Results are presented at the particle-level, permitting comparisons to multiple Monte Carlo event generator tools. Numerous tools and techniques that enable detailed analysis of the hadronic final state at high luminosity are described. The approaches presented utilize the dual strengths of the ATLAS calorimeter and tracking systems to provide high resolution and robust measurements of the hadronic jets that constitute both a background and a signal throughout ATLAS physics analyses. The study of the hadronic final state is then extended to jet substructure, where the energy flow and topology within individual jets is studied at the detector level and techniques for estimating systematic uncertainties for such measurements are commissioned in the first data. These first substructure measurements in ATLAS include the jet mass and sub-jet multiplicity as well as those concerned with multi-body hadronic decays and color flow within jets. Finally, the first boosted hadronic object observed at the LHC - the decay of the top quark to a single jet - is presented.

Miller, David Wilkins

2012-03-20

380

Muon detection with a dual-readout calorimeter  

Microsoft Academic Search

Muon detection in a copper-based fiber calorimeter is studied by simultaneously measuring the scintillation light and the Cherenkov light generated in the detector. We report on the calorimeter response to muons ranging in energy from 20–300 GeV. Muons penetrate the full depth of a calorimeter and therefore can pass through the readout structure (in this case, bundled fibers, ferrules and

N. Akchurin; K. Carrell; J. Hauptman; H. Kim; H. P. Paar; A. Penzo; R. Thomas; R. Wigmans

2004-01-01

381

Fast Shower Simulation in the ATLAS Calorimeter  

SciTech Connect

The time to simulate pp collisions in the ATLAS detector is largely dominated by the showering of electromagnetic particles in the heavy parts of the detector, especially the electromagnetic barrel and endcap calorimeters. Two procedures have been developed to accelerate the processing time of electromagnetic particles in these regions: (1) a fast shower parameterisation and (2) a frozen shower library. Both work by generating the response of the calorimeter to electrons and positrons with Geant 4, and then reintroduce the response into the simulation at runtime. In the fast shower parameterisation technique, a parameterization is tuned to single electrons and used later by simulation. In the frozen shower technique, actual showers from low-energy particles are used in the simulation. Full Geant 4 simulation is used to develop showers down to {approx} 1 GeV, at which point the shower is terminated by substituting a frozen shower. Judicious use of both techniques over the entire electromagnetic portion of the ATLAS calorimeter produces an important improvement of CPU time. We discuss the algorithms and their performance in this paper.

Barberio, E.; /Melbourne U.; Boudreau, J.; /Pittsburgh U.; Butler, B.; /SLAC; Cheung, S.L.; /Toronto U.; Dell'Acqua, A.; /CERN; Di Simone, A.; /CERN; Ehrenfeld, W.; /Hamburg U. /DESY; Gallas, M.V.; /CERN; Glazov, A.; /DESY; Marshall, Z.; /Caltech /Nevis Labs, Columbia U.; Mueller, J.; /Pittsburgh U.; Placakyte, R.; /DESY; Rimoldi, A.; /Pavia U. /INFN, Pavia; Savard, P.; /Toronto U.; Tsulaia, V.; /Pittsburgh U.; Waugh, A.; /Sydney U.; Young, C.C.; /SLAC

2011-11-08

382

Hadronic resonances at ALICE  

NASA Astrophysics Data System (ADS)

Measurements of the ratios of hadronic resonance yields to non-resonance yields can be used to study the properties of the hadronic phase of high-energy heavy-ion collisions. A change in resonance masses or widths could be an indication of chiral symmetry restoration. Measurements of resonances in proton-proton collisions provide an important baseline for measurements in heavy-ion collisions as well as data for tuning QCD-inspired particle production models. The ALICE collaboration has measured the K*(892)0 and phi(1020) resonances in Pb-Pb collisions at = 2.76 TeV and the K*(892)0, phi(1020), and ?*(1385)± resonances in pp collisions at = 7 TeV. These measurements - including transverse momentum spectra, ratios to non-resonances, masses, and widths - are discussed and compared to theoretical predictions.

Knospe, A. G.; Alice Collaboration

2013-09-01

383

Heavy Hadron Molecules  

SciTech Connect

The open charm mesons D{sub s0}*(2317), D{sub s1}(2460) and the hidden charm meson X(3872) are discussed as hadron molecules. Using a phenomenological Lagrangian approach we consider the strong and radiative decays of the D{sub s0}*(2317) and D{sub s1}(2460) states. The X(3872) is assumed to consist dominantly of molecular hadronic components with an additional small admixture of a charmonium configuration. Observed radiative ({gamma}J/{psi} and {gamma}{psi}(2s)) and strong (J/{psi}2{pi} and J/{psi}3{pi}) decays are shown to be consistent with the molecular structure assumption of the X(3872).

Gutsche, Thomas; Lyubovitskij, Valery E. [Institut fuer Theoretische Physik, Universitaet Tuebingen, Kepler Center for Astro and Particle Physics, Auf der Morgenstelle 14, D-72076 Tuebingen (Germany)

2010-08-05

384

The Large Hadron Collider  

Microsoft Academic Search

The Large Hadron Collider (LHC) project was approved by the CERN Council in December 1994. The machine will provide proton-proton collisions with a centre of mass energy of 14 TeV and an unprecedented luminosity of 1034 cm-2 s-1. In order to achieve the design energy within the constraint of the 27 km circumference LEP tunnel, the magnet system must operate

Lyndon R Evans

1995-01-01

385

Large Hadron Rap  

NSDL National Science Digital Library

This YouTube video, created by Kate McAlpine, features a rap song created to commemorate the start-up of The Large Hadron Collider (LHC). The rap lyrics present the theories that the LHC will test, as well as many of the challenges and questions of the standard model of particle physics. The video was shot at various parts of the LHC.

2008-10-10

386

Hadron Spectroscopy in 2006  

NASA Astrophysics Data System (ADS)

New results on hadron spectra have been appearing in abundance in the past few years as a result of improved experimental techniques. These include information on states made of both light quarks (u, d, and s) and with one or more heavy quarks (c, b). The present review, dedicated to the memory of R, H. Dalitz, treats light-quark states, glueballs, hybrids, charmed and beauty particles, charmonium, and bb states. Some future directions are mentioned.

Rosner, Jonathan L.

2006-11-01

387

Hadron mass formula  

NASA Astrophysics Data System (ADS)

An empirical hadron mass formula based on the rishon hypothesis of Harari is proposed. The calculated masses for 1- mesons and 32+ baryons are found to be in good agreement with available data. We predict M?(tt¯)=39.06 GeV and if a fourth generation exists, m?(b'b¯')=103.80 GeV and m?(t't¯')=356 GeV.

Singh, C. P.; Sharma, Avinash

1982-11-01

388

Electromagnetic polarizabilities of hadrons  

SciTech Connect

Electromagnetic polarizabilities of hadrons are reviewed, after a discussion of classical analogues. Differences between relativistic and non-relativistic approaches can lead to conflicts with conventional nuclear physics sum rules and calculational techniques. The nucleon polarizabilities are discussed in the context of the non-relativistic valence quark model, which provides a good qualitative description. The recently measured pion polarizabilities are discussed in the context of chiral symmetry and quark-loop models. 58 refs., 5 figs.

Friar, J.L.

1988-01-01

389

D-0 End Calorimeter Warm Tube/TeV Dry Air Purge  

SciTech Connect

This Engineering Note studies the design of the Dry Air Purge that is going to flow through the Warm Tube of the End Calorimeter of the D-O Calorimeter. The Tev tubes through the E.C. can be thought of as a cluster of concentric tubes: The Tev tube, the warm (vacuum vessel) tube, 15 layers of superinsulation, the cold (argon vessel) tube, and the Inner Hadronic center support tube. The Dry Air Purge will involve flowing Dry Air through the annular region between the Warm Tube and the Tev Beam Pipe. This air flow is intended to prevent condensation from forming in this region which could turn to ice under cryogenic temperatures. Any ice formed in this gap, could cause serious problems when these tubes are moved. The Air will flow through a Nylon Tube Fitting -1/4-inch I.D. to 1/8-inch male pipe thread (Cole Palmer YB-06465-15) see Drawing MC-295221 (Appendix A). This fitting will be attached to the Nylon 2-inch Tube-Wiper and Seal Assembly which is clamped to the ends of the Warm Tube (Appendix A). This note includes drawings and calculations that explain the setup of the Dry Air Purge and give the required information on the pressure drops through the setup. The Equations and properties used in the calculations were obtained from the Applied Fluid Dynamics Handbook by Robert D. Blevins and Fluid Dynamics Second Edition by Frank M. White.

Leibfritz, J.R.; /Fermilab

1991-08-14

390

High energy hadron-hadron collisions. [Dept. of Physics and Astronomy, Univ. of Georgia, Athens, Georgia  

SciTech Connect

Results of a study on high energy collisions with the geometrical model are summarized in three parts: (1) the elastic hadron-hadron collision, (2) the inelastic hadron-hadron collision, and (3) e[sup +]e[sup [minus

Chou, T.T.

1992-01-01

391

Searches for heavy long-lived sleptons and R-hadrons with the ATLAS detector  

NASA Astrophysics Data System (ADS)

A search for long-lived particles is performed using a data sample of 4.7 fb-1 from proton-proton collisions at a centre-of-mass energy ?s = 7 TeV collected by the ATLAS detector at the LHC. No excess is observed above the estimated background and lower limits, at 95% confidence level, are set on the mass of the long-lived particles in different scenarios, based on their possible interactions in the inner detector, the calorimeters and the muon spectrometer. Long-lived staus in gauge-mediated SUSY-breaking models are excluded up to a mass of 300 GeV for tan ? = 5 - 20. Directly produced long-lived sleptons are excluded up to a mass of 278 GeV. R-hadrons, composites of gluino (stop, sbottom) and light quarks, are excluded up to a mass of 985 GeV (683 GeV, 612 GeV) when using a generic interaction model. Additionally two sets of limits on R-hadrons are obtained that are less sensitive to the interaction model for R-hadrons. One set of limits is obtained using only the inner detector and calorimeter observables, and a second set of limits is obtained based on the inner detector alone. The full paper can be found in [1].

Mehlhase, Sascha

2013-05-01

392

Forward Di-Hadron Correlations in d+Au Collisions in PHENIX  

SciTech Connect

Suppression in nuclear modification factors have been observed in past measurements at RHIC at {radical}(s{sub NN}) = 200 GeV in deuteron-gold collisions. Gluon saturation has been proposed as one among many explanations for this effect. Due to the gluon densities at low Bjoerken-x in the Lorentz-contracted gold nuclei, saturation effects are expected to be enhanced in the forward direction of the deuteron. Two new electromagnetic calorimeters have been incorporated into the PHENIX experiment covering pseudo-rapidities of 3.1<{eta}<3.7(3.9). We have used these calorimeters to study forward di-hadron correlations, probing parton momentum fractions down to x{sub Bj}{approx_equal}10{sup -3} in the gold nuclei. This analysis is based on the 2008 d+Au data with an integrated luminosity of 80 nb{sup -1}.

Eyser, K. Oleg [University of California, Riverside, CA 92521 (United States)

2011-07-15

393

Supersymmetry at Hadron Supercolliders  

NASA Astrophysics Data System (ADS)

At the next generation of hadron supercolliders, the proposed U.S. Superconducting Supercollider (SSC) and the European Large Hadron Collider (LHC), protons will be collided at such high energy to allow the creation of new particles with masses greater those those that have been previously created in the laboratory. One of the most important questions to be resolved at these accelerators is whether or not any supersymmetric extension of the Standard Model is manifest below the TeV scale. It is expected that the strongly-interacting supersymmetric particles, the gluinos and squarks, will be pair-produced in the most abundance there. Light gluinos primarily decay into quarks and the lightest supersymmetric particle, which is assumed to escape detection; this gives the classic supersymmetric signature of events with large missing momentum. It is known, however, that for gluinos of masses larger than just 100 GeV this process is no longer the preferred gluino decay channel. New signals must therefore be sought to either detect these particles, or to set meaningful lower mass limits. It is in this work that such new detection strategies for supersymmetry at hadron supercolliders are proposed. Gluino and squark production rates and decay channels are studied in a model-independent fashion over the entire theoretical mass range of interest. New experimental signatures are proposed and compared with sources of background over a wide region of the parameter space that characterizes different supersymmetric models.

Dzialo, Debra Lynn

394

D0 Decomissioning : Storage of Depleted Uranium Modules Inside D0 Calorimeters after the Termination of D0 Experiment  

SciTech Connect

Dzero liquid Argon calorimeters contain hadronic modules made of depleted uranium plates. After the termination of DO detector's operation, liquid Argon will be transferred back to Argon storage Dewar, and all three calorimeters will be warmed up. At this point, there is no intention to disassemble the calorimeters. The depleted uranium modules will stay inside the cryostats. Depleted uranium is a by-product of the uranium enrichment process. It is slightly radioactive, emits alpha, beta and gamma radiation. External radiation hazards are minimal. Alpha radiation has no external exposure hazards, as dead layers of skin stop it; beta radiation might have effects only when there is a direct contact with skin; and gamma rays are negligible - levels are extremely low. Depleted uranium is a pyrophoric material. Small particles (such as shavings, powder etc.) may ignite with presence of Oxygen (air). Also, in presence of air and moisture it can oxidize. Depleted uranium can absorb moisture and keep oxidizing later, even after air and moisture are excluded. Uranium oxide can powder and flake off. This powder is also pyrographic. Uranium oxide may create health problems if inhaled. Since uranium oxide is water soluble, it may enter the bloodstream and cause toxic effects.

Sarychev, Michael; /Fermilab

2011-09-21

395

Microwave versus conventional sintering of silicon carbide tiles  

SciTech Connect

Silicon carbide is being evaluated as an armor material because of its lightweight, high-hardness, and excellent armor efficiency. However, one of the problems associated with silicon carbide is the high cost associated with achieving fully dense tiles. Full density requires either hot pressing and sintering or reaction bonding. Past efforts have shown that hot pressed tiles have a higher armor efficiency than those produced by reaction bonded sintering. An earlier stuy showed that the acoustic properties of fully-dense silicon carbide tiles were enhanced through the use of post-sintered microwave heat treatments. One of the least expensive forming techniques is to isostatically press-and-sinter. In this study, the authors have used microwave energy to densify silicon carbide green bodies. Microwave sintering has been demonstrated to be a very quick way to sinter ceramics such as alumina to exceptionally high densities. Previous work has shown that microwave post treatment of fully-dense reaction bonded silicon carbide tiles significantly improves the acoustic properties of the tiles. These properties include Poisson`s ratio, Young`s modulus, shear modulus, and bulk modulus.

Kass, M.D.; Caughman, J.B.O.; Forrester, S.C.; Akerman, A.

1997-05-07

396

Hollow clay tile wall program summary report  

SciTech Connect

Many of the Y-12 Plant buildings, constructed during the 1940s and 1950s, consist of steel ed concrete framing infilled with hollow clay tile (HCT). The infill was intended to provide for building enclosure and was not designed to have vertical or lateral load-carrying capacity. During the late 1970s and early 1980s, seismic and wind evaluations were performed on many of these buildings in conjunction with the preparation of a site-wide safety analysis report. This analytical work, based on the best available methodology, considered lateral load-carrying capacity of the HCT infill on the basis of building code allowable shear values. In parallel with the analysis effort, DOE initiated a program to develop natural phenomena capacity and performance criteria for existing buildings, but these criteria did not specify guidelines for determining the lateral force capacity of frames infilled with HCT. The evaluation of infills was, therefore, based on the provisions for the design of unreinforced masonry as outlined in standard masonry codes. When the results of the seismic and wind evaluations were compared with the new criteria, the projected building capacities fell short of the requirements. Apparently, if the buildings were to meet the new criteria, many millions of dollars would be required for building upgrades. Because the upgrade costs were significant, the assumptions and approaches used in the analyses were reevaluated. Four issues were identified: (1) Once the infilled walls cracked, what capacity (nonlinear response), if any, would the walls have to resist earthquake or wind loads applied in the plane of the infill (in-plane)? (2) Would the infilled walls remain within the steel or reinforced concrete framing when subjected to earthquake or high wind loads applied perpendicular to the infill (out-of-plane)? (3) What was the actual shear capacity of the HCT infill? (4) Was modeling the HCT infill as a shear wall the best approach?

Henderson, R.C.; Jones, W.D. [Gilbert/Commonwealth, Inc., Oak Ridge, TN (United States); Beavers, J.E. [MS Technology, Inc. (United States)

1995-07-30

397

Evaluation of Phosphatic Clay and Other Wastes for Construction Products: 1. Tile.  

National Technical Information Service (NTIS)

An extensive series of experiments concerning ceramic tile body and glaze compositions and test evaluations have been conducted on a number of ceramic tiles formulated with different phosphatic clays from the central Florida phosphate district, combined w...

W. B. Crandall

1986-01-01

398

40 CFR 427.70 - Applicability; description of the asbestos floor tile subcategory.  

Code of Federal Regulations, 2011 CFR

...false Applicability; description of the asbestos floor tile subcategory. 427.70 Section...CONTINUED) EFFLUENT GUIDELINES AND STANDARDS ASBESTOS MANUFACTURING POINT SOURCE CATEGORY Asbestos Floor Tile Subcategory § 427.70...

2011-07-01

399

40 CFR 427.70 - Applicability; description of the asbestos floor tile subcategory.  

Code of Federal Regulations, 2013 CFR

...false Applicability; description of the asbestos floor tile subcategory. 427.70 Section...EFFLUENT GUIDELINES AND STANDARDS (CONTINUED) ASBESTOS MANUFACTURING POINT SOURCE CATEGORY Asbestos Floor Tile Subcategory § 427.70...

2013-07-01

400

Complex Archimedean tiling self-assembled from DNA nanostructures.  

PubMed

Archimedean tilings are periodic polygonal tessellations that are created by placing regular polygons edge-to-edge around a vertex to fill the plane. Here we show that three- and four-arm DNA junction tiles with specifically designed arm lengths and intertile sticky-end interactions can be used to form sophisticated two-dimensional (2D) and three-dimensional (3D) tessellation patterns. We demonstrate two different complex Archimedean patterns, (3(3).4(2)) and (3(2).4.3.4), and the formation of 2D lattices, 3D tubes, and sealed polygon-shaped pockets from the tessellations. The successful growth of hybrid DNA tile motif arrays suggests that it maybe possible to generate 2D quasi-crystals from DNA building blocks. PMID:23651321

Zhang, Fei; Liu, Yan; Yan, Hao

2013-05-14

401

PHASE CHANGE MATERIALS IN FLOOR TILES FOR THERMAL ENERGY STORAGE  

SciTech Connect

Passive solar systems integrated into residential structures significantly reduce heating energy consumption. Taking advantage of latent heat storage has further increased energy savings. This is accomplished by the incorporation of phase change materials into building materials used in passive applications. Trombe walls, ceilings and floors can all be enhanced with phase change materials. Increasing the thermal storage of floor tile by the addition of encapsulated paraffin wax is the proposed topic of research. Latent heat storage of a phase change material (PCM) is obtained during a change in phase. Typical materials use the latent heat released when the material changes from a liquid to a solid. Paraffin wax and salt hydrates are examples of such materials. Other PCMs that have been recently investigated undergo a phase transition from one solid form to another. During this process they will release heat. These are known as solid-state phase change materials. All have large latent heats, which makes them ideal for passive solar applications. Easy incorporation into various building materials is must for these materials. This proposal will address the advantages and disadvantages of using these materials in floor tile. Prototype tile will be made from a mixture of quartz, binder and phase change material. The thermal and structural properties of the prototype tiles will be tested fully. It is expected that with the addition of the phase change material the structural properties will be compromised to some extent. The ratio of phase change material in the tile will have to be varied to determine the best mixture to provide significant thermal storage, while maintaining structural properties that meet the industry standards for floor tile.

Douglas C. Hittle

2002-10-01

402

Eliminating the longitudinal piston error between tiled gratings by angle tuning.  

PubMed

In a tiled-grating system, it is difficult to make two tiled gratings strictly coplanar. We propose and demonstrate for the first time, as far as we know, a simple method by which the longitudinal piston error between two tiled gratings can be reduced below lambda/10, close to the influence of the environmental factors. The alignment precision of the method increases with the tiled-grating system's stability to environmental factors. PMID:17215945

Zuo, Yanlei; Wei, Xiaofeng; Wang, Xiao; Zhu, Qihua; Ren, Rui; Huang, Zheng; Liu, Hongjie; Ying, Chuntong

2007-02-01

403

Algorithm for elliptic curve Diffie-Hellman key exchange based on DNA tile self-assembly  

Microsoft Academic Search

DNA tile self-assembly is a promising paradigm for nanotechnology. Recently, many researches show that computation by DNA tile self-assembly maybe scalable. In this paper, we propose the algorithm for elliptic curve Diffie-Hellman key exchange based on DNA tile self-assembly. First we give the DNA tile self-assembly model to compute the scalar multiplication, then we can successfully implement the Diffie-Hellman key

Zhen Cheng; Yufang Huang; Jin Xu

2008-01-01

404

Scalable, Tiled Display Wall for Graphics using a Coordinated Cluster of PCs  

Microsoft Academic Search

Tiled displays can provide high resolution and large dis- play area. Cluster-based tiled displays are cost-effective and scalable. Chromium is a popular software API used to build such displays; Chromium based tiled displays tend to be network-limited affecting the scalability in the num- ber of nodes and the ability to handle really large envi- ronment models. We present a tiled

P J Narayanan

405

Features of the absorption of 2-to 40-TeV cosmic-ray hadrons in lead  

SciTech Connect

For the first time, experimental data on 2-to 40-TeV hadronic cascades recorded by a lead ionization calorimeter at the Tien-Shan mountain station of the Lebedev Institute of Physics (Moscow) are compared with the results of a present-day simulation based on the GEANT 3.21 code and performed with allowance for the detection procedure. The conclusion that along-flying component appears in high-energy hadronic cascades was drawn previously on the basis of these data. Some special features of the procedure for recording TeV-range hadrons in the calorimeter are considered. It is shown that the averaged hadronic cascades and various features of single cascades having energies below 10 TeV are simulated adequately by using the QGSJET + FLUKA generators of nuclear interactions, but that they are not described by using the GHEISHA generator at lower energies. Some features of the experimentally observed cascades could not be described for cascade energies above 10 TeV.

Sveshnikova, L. G. [Moscow State University, Institute of Nuclear Physics (Russian Federation)], E-mail: sws@dec1.sinp.msu.ru; Yakovlev, V. I. [Russian Academy of Sciences, Lebedev Institute of Physics (Russian Federation); Turundaevskii, A. N. [Moscow State University, Institute of Nuclear Physics (Russian Federation); Galkin, V. I. [Moscow State University, Department of Physics (Russian Federation); Nazarov, S. I.; Podorozhnyi, D. M. [Moscow State University, Institute of Nuclear Physics (Russian Federation); Popova, N. S. [Moscow State University, Department of Physics (Russian Federation); Roganova, T. M. [Moscow State University, Institute of Nuclear Physics (Russian Federation)

2006-02-15

406

Optical-tiled AMLCD for very large display applications  

NASA Astrophysics Data System (ADS)

We present a new method of tiling flat panel displays to a continuous large display. The method was tested for color Active Matrix Liquid Crystal Display (AMLCD) with backlight. Diverging glass fiber-optic faceplates configuration were used to show the principle, however, the method is applicable and was verified also with plastic faceplates and micro-channels (hollow pipes). The manufacturing of the displays and the faceplates are done separately and then assembled together. The method presented shows very little loss of resolution and very wide viewing angles. There are no limitations to the number of tiled displays in both horizontal and vertical direction.

Abileah, Adi; Yaniv, Zvi

1992-07-01

407

Charmed hadrons from strangeness-rich QGP  

Microsoft Academic Search

The yields of charmed hadrons emitted by strangeness-rich QGP are evaluated within the chemical non-equilibrium statistical hadronization model, conserving strangeness, charm and entropy yields at hadronization.

Inga Kuznetsova; Johann Rafelski

2006-01-01

408

Validation of Hadronic Models in Geant4.  

National Technical Information Service (NTIS)

Geant4 is a software toolkit for the simulation of the passage of particles through matter. It has abundant hadronic models from thermal neutron interactions to ultra relativistic hadrons. An overview of validations in Geant4 hadronic physics is presented...

D. H. Wright G. Folger T. Koi V. Ivantchenko

2006-01-01

409

Quarkonia production with leptons and hadrons  

SciTech Connect

We discuss current issues and present the latest measurements on quarkonia production from experiments monitoring hadron-hadron and lepton-hadron collisions. These measurements include cross section and polarization results for charmonium and bottomonium states.

V. Papadimitriou

2004-06-09

410

Physics of very high energy hadron-hadron colliders  

SciTech Connect

A review is given of the physics accessible at a very high energy hadron-hadron collider. Emphasis is placed on the reliability of the predicted rates, and upon the energy and luminosity required to explore new physics options. 38 refs., 19 figs.

Hinchliffe, I.

1986-09-01

411

High energy hadron-hadron collisions. Annual progress report  

SciTech Connect

Results of a study on high energy collisions with the geometrical model are summarized in three parts: (1) the elastic hadron-hadron collision, (2) the inelastic hadron-hadron collision, and (3) e{sup +}e{sup {minus}} annihilation. For elastic scattering, a modified form for the hadronic matter form factor of the proton was proposed which is still dipole in form but contains an energy--dependent range parameter. This new expression of the opacity function fits the elastic {bar p}p scattering very well from the ISR to S{bar p}pS energies. Extrapolation of this theory also yielded results {bar p}p in good agreement with the {bar p}p differential cross section measured at the Tevatron. For inelastic hadron-hadron collisions, we have made a systematic investigation of the single-particle momentum spectra in the entire S{bar p}pS energy region. Results are useful for the extrapolation of angular distribution to the higher SSC energies. In e{sup +}e{sup {minus}} annihilation, a detailed analysis of all available experimental multiplicity data from PETRA to LEP energies has been performed. The cluster size of emitted hadrons increases gradually with energy. Aside from high-energy collisions, the giant fullerene molecules were studied and precise algebraic eigenvalue expressions of the Hueckel problem for carbon-240 were obtained.

Chou, T.T.

1992-12-31

412

Conditions of high-speed firing of floor tiles eliminating the formation of blackheart  

Microsoft Academic Search

The heart of the tiles from the investigated bodies after their high-speed firing up to 1100~ had a color differing from the usual for the given body. Depending on the composition of the body, the fired tiles from the Nikolaevskii and Nikiforovskii clays and from the Nikiforovskii--Novoraiskii clays had a black color of the heart, whereas the tiles from the

Yu. P. Kareev; P. I. Berenshtein

1970-01-01

413

A method for synchronization mismatch perception evaluation for large ultra high resolution tiled displays  

Microsoft Academic Search

We propose a method for perception evaluation of synchronization mismatch for large ultra high resolution tiled displays. The results from this work can help during design of low cost tiled display systems which utilize distributed synchronization mechanisms for image display. We describe a method for creation of synchronization mismatch measurement test video set for various tile configurations for various inter-panel

Sachin Deshpande

2009-01-01

414

Preliminary control technology assessment of the Cambridge Tile Manufacturing Company, Cincinnati, Ohio  

Microsoft Academic Search

A visit was made to the Cambridge Tile Manufacturing Company, Cincinnati, Ohio to evaluate methods used to control hazardous conditions arising during the manufacturing process. Particular attention was given to controlling exposures to harmful chemical agents, silica, noise and excessive heat. The company manufactured 20,000 square feet of tile per day including nonrefractory tiles. A fabric stocking-type sleeve between railroad

1982-01-01

415

WALL TILING FIXATIVES FOR APPLICATIONS ON CALCIUM-SILICATE BRICK WALLS  

Microsoft Academic Search

The performance of different types of fixatives is evaluated, with the aims of establishing the most suitable fixatives for internal wall tiling on calcium silicate brick walls. Test panels of wall tiles were fixed to rendered and unrendered calcium silicate brick walls with different fixatives. Strains in the tiles were measured with strain gauges. Those at the face of the

T. E. Uher

1986-01-01

416

Calibration of a calorimeter for measurements of electrostatic discharge  

Microsoft Academic Search

Our study dealt with the factors that influence the accuracy of the measurements performed with a calorimeter, developed to detect the optical signal, emitted by the spark generated to facilitate experiments with electrostatic discharge. Experiments are described, which were performed with a special calorimeter and a compound optical source consisting of a spark gap, a human-body-model ESD signal generator, and

Z. Kucerovsky; W. D. Greason; M. Wm. Flatley

1999-01-01

417

First Experimental Tests of a Lead Glass Drift Calorimeter.  

National Technical Information Service (NTIS)

We are building a drift collection calorimeter, which has a combined radiator and electric field shaping structure made of fused lead glass tubing, treated in a H sub 2 reducing atmosphere. We describe the construction detail of the calorimeter and the ex...

A. D. Guerra R. Bellazzini M. Conti M. M. Massai G. Schwartz

1985-01-01

418

Precision two-compartment bomb calorimeter for combustion in fluorine  

Microsoft Academic Search

An isothermally jacketed liquid calorimeter permitting thermochemical studies on spontaneous combustion in fluorine has been built and tested. The fluorine storage tank was located outside the calorimeter vessel, thus lowering the heat capacity of the system and its thermal inertia. Particular attention was paid to the method and rate of liquid circulation since it largely determines the experimental accuracy. The

H. Lenski; D. Böhler

1980-01-01

419

High-temperature and high-pressure flow calorimeter  

Microsoft Academic Search

Flow calorimetry is a useful method for measuring the specific heat of fluids. Flow calorimeter also can be used as a flowing style chemical reactor and so that the heat of reaction will be measured using it. In this study, the flow calorimeter used for the specific heat measurement of aqueous ammonia and the reaction heat measurement is manufactured and

Yoshio Abe; Yoichi Kanno; Minoru Takahashi; Chiaki Yokoyama

1992-01-01

420

Ac loss calorimeter for three-phase cable  

SciTech Connect

A calorimeter for measuring ac losses in meter-long lengths of HTS superconducting power transmission line cables is described. The calorimeter, which is based on a temperature difference technique, has a precision of 1 mW and measures single, two-phase (coupling), and three-phase losses. The measurements show significant coupling losses between phases.

Daney, D.E.; Boenig, H.J.; Maley, M.P.; McMurry, D.E.; DeBlanc, B.G. [Los Alamos National Lab., NM (United States). Superconductivity Technology Center

1996-10-01

421

Performance and operation of the CMS electromagnetic calorimeter  

Microsoft Academic Search

The operation and general performance of the CMS electromagnetic calorimeter using cosmic-ray muons are described. These muons were recorded after the closure of the CMS detector in late 2008. The calorimeter is made of lead tungstate crystals and the overall status of the 75 848 channels corresponding to the barrel and endcap detectors is reported. The stability of crucial operational

S. Chatrchyan; V. Khachatryan; A. M. Sirunyan; W. Adam; B. Arnold; H. Bergauer; T. Bergauer; M. Dragicevic; M. Eichberger; J. Ero; M. Friedl; R. Fruhwirth; V. M. Ghete; J. Hammer; S. Hansel; M. Hoch; N. Hormann; J. Hrubec; M. Jeitler; G. Kasieczka; K. Kastner; M. Krammer; D. Liko; I. M. de Abril; I. Mikulec; F. Mittermayr; B. Neuherz; M. Oberegger; M. Padrta; M. Pernicka; H. Rohringer; S. Schmid; R. Schofbeck; T. Schreiner; R. Stark; H. Steininger; J. Strauss; A. Taurok; F. Teischinger; T. Themel; D. Uhl; P. Wagner; W. Waltenberger; G. Walzel; E. Widl; C. E. Wulz; V. Chekhovsky; O. Dvornikov; I. Emeliantchik; A. Litomin; V. Makarenko; I. Marfin; V. Mossolov; N. Shumeiko; A. Solin; R. Stefanovitch; J. S. Gonzalez; A. Tikhonov; A. Fedorov; A. Karneyeu; M. Korzhik; V. Panov; R. Zuyeuski; P. Kuchinsky; W. Beaumont; L. Benucci; M. Cardaci; E. A. De Wolf; E. Delmeire; D. Druzhkin; M. Hashemi; X. Janssen; T. Maes; L. Mucibello; S. Ochesanu; R. Rougny; M. Selvaggi; H. Van Haevermaet; P. Van Mechelen; N. Van Remortel; V. Adler; S. Beauceron; S. Blyweert; J. DHondt; S. De Weirdt; O. Devroede; J. Heyninck; A. Kalogeropoulos; J. Maes; M. Maes; M. U. Mozer; S. Tavernier; W. Van Doninck; P. Van Mulders; I. Villella; O. Bouhali; E. C. Chabert; O. Charaf; B. Clerbaux; G. De Lentdecker; V. Dero; S. Elgammal; A. P. R. Gay; G. H. Hammad; P. E. Marage; S. Rugovac; C. Vander Velde; P. Vanlaer; J. Wickens; M. Grunewald; B. Klein; A. Marinov; D. Ryckbosch; F. Thyssen; M. Tytgat; L. Vanelderen; P. Verwilligen; S. Basegmez; G. Bruno; J. Caudron; C. Delaere; P. Demin; D. Favart; A. Giammanco; G. Gregoire; V. Lemaitre; O. Militaru; S. Ovyn; K. Piotrzkowski; L. Quertenmont; N. Schul; N. Beliy; E. Daubie; G. A. Alves; M. E. Pol; M. H. G. Souza; W. Carvalho; D. D. Damiao; C. D. Martins; S. F. De Souza; L. Mundim; V. Oguri; A. Santoro; S. M. S. Do Amaral; A. Sznajder; Trfp Tomei; M. A. F. Dias; E. M. Gregores; S. F. Novaes; K. Abadjiev; T. Anguelov; J. Damgov; N. Darmenov; L. Dimitrov; V. Genchev; P. Iaydjiev; S. Piperov; S. Stoykova; G. Sultanov; R. Trayanov; I. Vankov; A. Dimitrov; M. Dyulendarova; V. Kozhuharov; L. Litov; E. Marinova; M. Mateev; B. Pavlov; P. Petkov; Z. Toteva; G. M. Chen; H. S. Chen; W. Guan; C. H. Jiang; D. Liang; B. Liu; X. Meng; J. Tao; J. Wang; Z. Wang; Z. Xue; Z. Zhang; Y. Ban; J. Cai; Y. Ge; S. Guo; Z. Hu; Y. Mao; S. J. Qian; H. Teng; B. Zhu; C. Avila; M. B. Ruiz; C. A. C. Montoya; A. Gomez; B. G. Moreno; A. A. O. Rios; A. F. O. Oliveros; D. R. Romero; J. C. Sanabria; N. Godinovic; K. Lelas; R. Plestina; D. Polic; I. Puljak; Z. Antunovic; M. Dzelalija; V. Brigljevic; S. Duric; K. Kadija; S. Morovic; R. Fereos; M. Galanti; J. Mousa; A. Papadakis; F. Ptochos; P. A. Razis; D. Tsiakkouri; Z. Zinonos; A. Hektor; M. Kadastik; K. Kannike; M. Muntel; M. Raidal; L. Rebane; E. Anttila; S. Czellar; J. Harkonen; A. Heikkinen; V. Karimaki; R. Kinnunen; J. Klem; M. J. Kortelainen; T. Lampen; K. Lassila-Perini; S. Lehti; T. Linden; P. Luukka; T. Maenpaa; J. Nysten; E. Tuominen; J. Tuominiemi; D. Ungaro; L. Wendland; K. Banzuzi; A. Korpela; T. Tuuva; P. Nedelec; D. Sillou; M. Besancon; R. Chipaux; M. Dejardin; D. Denegri; J. Descamps; B. Fabbro; J. L. Faure; F. Ferri; S. Ganjour; F. X. Gentit; A. Givernaud; P. Gras; G. H. de Monchenault; P. Jarry; M. C. Lemaire; E. Locci; J. Malcles; M. Marionneau; L. Millischer; J. Rander; A. Rosowsky; D. Rousseau; M. Titov; P. Verrecchia; S. Baffioni; L. Bianchini; M. Bluj; P. Busson; C. Charlot; L. Dobrzynski; R. G. de Cassagnac; M. Haguenauer; P. Minc; P. Paganini; Y. Sirois; C. Thiebaux; A. Zabi; J. L. Agram; A. Besson; D. Bloch; D. Bodin; J. M. Brom; E. Conte; F. Drouhin; J. C. Fontaine; D. Gele; U. Goerlach; L. Gross; P. Juillot; A. C. Le Bihan; Y. Patois; J. Speck; P. Van Hove; C. Baty; M. Bedjidian; J. Blaha; G. Boudoul; H. Brun; N. Chanon; R. Chierici; D. Contardo; P. Depasse; T. Dupasquier; H. El Mamouni; F. Fassi; J. Fay; S. Gascon; B. Ille; T. Kurca; T. Le Grand; M. Lethuillier; N. Lumb; L. Mirabito; S. Perries; M. Vander Donckt; P. Verdier; N. Djaoshvili; N. Roinishvili; V. Roinishvili; N. Amaglobeli; R. Adolphi; G. Anagnostou; R. Brauer; W. Braunschweig; M. Edelhoff; H. Esser; L. Feld; W. Karpinski; A. Khomich; K. Klein; N. Mohr; A. Ostaptchouk; D. Pandoulas; G. Pierschel; F. Raupach; S. Schael; A. S. von Dratzig; G. Schwering; D. Sprenger; M. Thomas; M. Weber; B. Wittmer; M. Wlochal; O. Actis; G. Altenhofer; W. Bender; P. Biallass; M. Erdmann; G. Fetchenhauer; J. Frangenheim; T. Hebbeker; G. Hilgers; A. Hinzmann; K. Hoepfner; C. Hof; M. Kirsch; T. Klimkovich; P. Kreuzer; D. Lanske; M. Merschmeyer; A. Meyer; B. Philipps; H. Pieta; H. Reithler; S. A. Schmitz; L. Sonnenschein; M. Sowa; J. Steggemann; H. Szczesny; D. Teyssier; C. Zeidler; M. Bontenackels; M. Davids; M. Duda; G. Flugge; H. Geenen; M. Giffels; W. H. Ahmad; T. Hermanns; D. Heydhausen

2010-01-01

422

Topics in hadronic physics  

NASA Astrophysics Data System (ADS)

Regge trajectories are plotted from the most recent data to show that linearity is not a necessary feature of the trajectories. Samples of Regge trajectories are calculated from the Maung-Kahana-Norbury bound state equation using the Nystrom-plus-correction method. The QCD string based Lund model is used to calculate the invariant cross sections of pions in the soft pT region. Invariant Hadron production cross sections in the hard pT region are calculated from the Feynman-Field perturbative QCD model. Theory and experimental data are parameterized so that the invariant production cross sections are usable to the NASA HZETRN transport code.

Tang, Alfred

423

ARE MAGNETIC MONOPOLES HADRONS?  

SciTech Connect

The charges of magnetic monopoles are constrained to a multiple of 2{pi} times the inverse of the elementary unit electric charge. In the standard model, quarks have fractional charge, raising the question of whether the basic magnetic monopole unit is a multiple of 2{pi} or three times that. A simple lattice construction shows how a magnetic monopole of the lower strength is possible if it interacts with gluonic fields as well. Such a monopole is thus a hadron. This is consistent with the construction of magnetic monopoles in grand unified theories.

CREUTZ, M.

2004-06-21

424

Hadron mass formula  

SciTech Connect

An empirical hadron mass formula based on the rishon hypothesis of Harari is proposed. The calculated masses for 1/sup -/ mesons and 3/2/sup +/ baryons are found to be in good agreement with available data. We predict m/sub( Upsilont/t-bar) = 39.06 GeV and if a fourth generation exists, m/sub( Upsilonb//sup prime/b-bar/sup prime/) = 103.80 GeV and m/sub( Upsilont//sup prime/t-bar/sup prime/) = 356 GeV.

Singh, C.P.; Sharma, A.

1982-11-01

425

High energy hadron colliders  

SciTech Connect

The more novel and important design considerations and features of high energy hadron colliders (pp or p anti p) are discussed. The paper does not attempt to be sufficient for making a complete design, but contains enough references to other papers necessary for doing so. Formulas are generally given without derivation, and notations are not consistent from section to section. For most formulas the derivation is transparent although the mathematics may be lengthy. Whenever obscure, an explanation of the procedure for derivation will be given in physical terms. Detailed mathematical derivations can be found in the references. 10 references.

Teng, L.C.

1984-01-01

426

(Development of industrial processes for manufacturing of silicon sampling hadron calorimeters)  

SciTech Connect

The travelers attended meetings in Dubna and in Zelenograd. Discussions in Dubna centered on (1) obtaining information on USSR capabilities in silicon detector manufacture and testing and on (2) strategy regarding the development of an industrial process and the manufacture of a large quantity of silicon detectors for the SSC L* collaboration. The ELMA plant in Zelenograd was inspected, and discussions were held on production process development and on a possible detector supply time line. In addition, J. Walter participated in technical and cost estimate forecast discussions with representatives of Wacker-Chemitronic Factory (Germany) about silicon crystals for possible use in the SSC.

Plasil, F.; Walter, J.

1991-01-04

427

Progress on the upgrade of the CMS Hadron Calorimeter Front-End electronics  

SciTech Connect

We present a scheme to upgrade the CMS HCAL front-end electronics in the second long shutdown to upgrade the LHC (LS2), which is expected to occur around 2018. The HCAL electronics upgrade is required to handle the major instantaneous luminosity increase (up to 5 * 10{sup 34} cm{sup -2} s{sup -1}) and an expected integrated luminosity of {approx}3000 fb{sup -1}. A key aspect of the HCAL upgrade is to read out longitudinal segmentation information to improve background rejection, energy resolution, and electron isolation at the L1 trigger. This paper focuses on the requirements for the new electronics and on the proposed solutions. The requirements include increased channel count, additional timing capabilities, and additional redundancy. The electronics are required to operate in a harsh environment and are constrained by the existing infrastructure. The proposed solutions span from chip level to system level. They include the development of a new ASIC ADC, the design and testing of higher speed transmitters to handle the increased data volume, the evaluation and use of circuits from other developments, evaluation of commercial FPGAs, better thermal design, and improvements in the overall readout architecture. We will report on the progress of the designs for these upgraded systems, along with performance requirements and initial design studies.

Anderson, Jake; Whitmore, Juliana; /Fermilab

2011-11-01

428

Polarization of Target in Crystal Ball Calorimeter  

NASA Astrophysics Data System (ADS)

A pion photo-production experiment is being conducted at MAMI-lab in Mainz, Germany. In Mainz I was working at the Mainz Microtron (MAMI) using a polarized tagged photon beam, a transversely polarized proton target, and the Crystal Ball calorimeter. The Crystal Ball can measure energy, position energy and timing at many angles. A butanol polarized target was used in the May/June run of the Crystal Ball experiment. Finding an accurate relaxation time for the polarization will be useful in determining a proper time for each experimental run.

Kuczynski, Jennifer; Briscoe, William; Thomas, Andreas

2010-11-01

429

Hadron spectroscopy in Regge phenomenology  

SciTech Connect

The authors show that linear Regge trajectories for mesons and baryons, and the cubic mass spectrum associated with them, determine expressions of the hadron masses in terms of the universal Regge slope {alpha}{prime} alone. The hadron masses as calculated from these expressions are in excellent agreement with experiment for {alpha}{prime} = 0.85 GeV{sup -2}.

Burakovsky, L.

1998-12-01

430

Electromagnetic Interactions and Hadronic Structure  

NASA Astrophysics Data System (ADS)

1. Quark models of hadrons and issues in quark dynamics; 2. Elastic form factors; 3. Electromagnetic excitations of nucleon resonances; 4. Meson radiative decays; 5. Intermediate-energy photoproduction; 6. Chiral perturbation theory; 7. Spin structure functions; 8. Diffraction and colour dipoles; 9. Generalized parton distributions; 10. Quark-hadron duality; 11. Colour transparency; Index.

Close, Frank; Donnachie, Sandy; Shaw, Graham

2007-05-01

431

Electromagnetic Interactions and Hadronic Structure  

NASA Astrophysics Data System (ADS)

1. Quark models of hadrons and issues in quark dynamics; 2. Elastic form factors; 3. Electromagnetic excitations of nucleon resonances; 4. Meson radiative decays; 5. Intermediate-energy photoproduction; 6. Chiral perturbation theory; 7. Spin structure functions; 8. Diffraction and colour dipoles; 9. Generalized parton distributions; 10. Quark-hadron duality; 11. Colour transparency; Index.

Close, Frank; Donnachie, Sandy; Shaw, Graham

2009-07-01

432

Experimental studies of di-jets in Au + Au collisions using angular correlations with respect to back-to-back leading hadrons  

NASA Astrophysics Data System (ADS)

Jet-medium interactions are studied via a multihadron correlation technique (called “2+1”), where a pair of back-to-back hadron triggers with large transverse momentum is used as a proxy for a di-jet. This work extends the previous analysis for nearly symmetric trigger pairs with the highest momentum threshold of trigger hadron of 5 GeV/c with the new calorimeter-based triggers with energy thresholds of up to 10 GeV and above. The distributions of associated hadrons are studied in terms of correlation shapes and per-trigger yields on each trigger side. In contrast with di-hadron correlation results with single triggers, the associated hadron distributions for back-to-back triggers from central Au+Au data at sNN=200 GeV show no strong modifications compared to d+Au data at the same energy. An imbalance in the total transverse momentum between hadrons attributed to the near-side and away-side of jetlike peaks is observed. The relative imbalance in the Au+Au measurement with respect to d+Au reference is found to increase with the asymmetry of the trigger pair, consistent with the expectation from medium-induced energy-loss effects. In addition, this relative total transverse momentum imbalance is found to decrease for softer associated hadrons. Such evolution indicates that the energy missing at higher associated momenta is converted into softer hadrons.

Adamczyk, L.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Alakhverdyants, A. V.; Alekseev, I.; Alford, J.; Anson, C. D.; Arkhipkin, D.; Aschenauer, E.; Averichev, G. S.; Balewski, J.; Banerjee, A.; Barnovska, Z.; Beavis, D. R.; Bellwied, R.; Betancourt, M. J.; Betts, R. R.; Bhasin, A.; Bhati, A. K.; Bichsel, H.; Bielcik, J.; Bielcikova, J.; Bland, L. C.; Bordyuzhin, I. G.; Borowski, W.; Bouchet, J.; Brandin, A. V.; Brovko, S. G.; Bruna, E.; Bültmann, S.; Bunzarov, I.; Burton, T. P.; Butterworth, J.; Cai, X. Z.; Caines, H.; Calderón de la Barca Sánchez, M.; Cebra, D.; Cendejas, R.; Cervantes, M. C.; Chaloupka, P.; Chang, Z.; Chattopadhyay, S.; Chen, H. F.; Chen, J. H.; Chen, J. Y.; Chen, L.; Cheng, J.; Cherney, M.; Chikanian, A.; Christie, W.; Chung, P.; Chwastowski, J.; Codrington, M. J. M.; Corliss, R.; Cramer, J. G.; Crawford, H. J.; Cui, X.; Das, S.; Davila Leyva, A.; De Silva, L. C.; Debbe, R. R.; Dedovich, T. G.; Deng, J.; Derradi de Souza, R.; Dhamija, S.; Didenko, L.; Ding, F.; Dion, A.; Djawotho, P.; Dong, X.; Drachenberg, J. L.; Draper, J. E.; Du, C. M.; Dunkelberger, L. E.; Dunlop, J. C.; Efimov, L. G.; Elnimr, M.; Engelage, J.; Eppley, G.; Eun, L.; Evdokimov, O.; Fatemi, R.; Fazio, S.; Fedorisin, J.; Fersch, R. G.; Filip, P.; Finch, E.; Fisyak, Y.; Gagliardi, C. A.; Gangadharan, D. R.; Geurts, F.; Gibson, A.; Gliske, S.; Gorbunov, Y. N.; Grebenyuk, O. G.; Grosnick, D.; Gupta, S.; Guryn, W.; Haag, B.; Hajkova, O.; Hamed, A.; Han, L.-X.; Harris, J. W.; Hays-Wehle, J. P.; Heppelmann, S.; Hirsch, A.; Hoffmann, G. W.; Hofman, D. J.; Horvat, S.; Huang, B.; Huang, H. Z.; Huck, P.; Humanic, T. J.; Huo, L.; Igo, G.; Jacobs, W. W.; Jena, C.; Judd, E. G.; Kabana, S.; Kang, K.; Kapitan, J.; Kauder, K.; Ke, H. W.; Keane, D.; Kechechyan, A.; Kesich, A.; Kikola, D. P.; Kiryluk, J.; Kisel, I.; Kisiel, A.; Kizka, V.; Klein, S. R.; Koetke, D. D.; Kollegger, T.; Konzer, J.; Koralt, I.; Koroleva, L.; Korsch, W.; Kotchenda, L.; Kravtsov, P.; Krueger, K.; Kulakov, I.; Kumar, L.; Lamont, M. A. C.; Landgraf, J. M.; LaPointe, S.; Lauret, J.; Lebedev, A.; Lednicky, R.; Lee, J. H.; Leight, W.; LeVine, M. J.; Li, C.; Li, L.; Li, W.; Li, X.; Li, X.; Li, Y.; Li, Z. M.; Lima, L. M.; Lisa, M. A.; Liu, F.; Ljubicic, T.; Llope, W. J.; Longacre, R. S.; Lu, Y.; Luo, X.; Luszczak, A.; Ma, G. L.; Ma, Y. G.; Madagodagettige Don, D. M. M. D.; Mahapatra, D. P.; Majka, R.; Mall, O. I.; Margetis, S.; Markert, C.; Masui, H.; Matis, H. S.; McDonald, D.; McShane, T. S.; Mioduszewski, S.; Mitrovski, M. K.; Mohammed, Y.; Mohanty, B.; Mondal, M. M.; Morozov, B.; Munhoz, M. G.; Mustafa, M. K.; Naglis, M.; Nandi, B. K.; Nasim, Md.; Nayak, T. K.; Nelson, J. M.; Nogach, L. V.; Novak, J.; Odyniec, G.; Ogawa, A.; Oh, K.; Ohlson, A.; Okorokov, V.; Oldag, E. W.; Oliveira, R. A. N.; Olson, D.; Ostrowski, P.; Pachr, M.; Page, B. S.; Pal, S. K.; Pan, Y. X.; Pandit, Y.; Panebratsev, Y.; Pawlak, T.; Pawlik, B.; Pei, H.; Perkins, C.; Peryt, W.; Pile, P.; Planinic, M.; Pluta, J.; Plyku, D.; Poljak, N.; Porter, J.; Poskanzer, A. M.; Powell, C. B.; Pruneau, C.; Pruthi, N. K.; Przybycien, M.; Pujahari, P. R.; Putschke, J.; Qiu, H.; Raniwala, R.; Raniwala, S.; Ray, R. L.; Redwine, R.; Reed, R.; Riley, C. K.; Ritter, H. G.; Roberts, J. B.; Rogachevskiy, O. V.; Romero, J. L.; Ross, J. F.; Ruan, L.; Rusnak, J.; Sahoo, N. R.; Sahu, P. K.; Sakrejda, I.; Salur, S.; Sandacz, A.; Sandweiss, J.; Sangaline, E.; Sarkar, A.; Schambach, J.; Scharenberg, R. P.; Schmah, A. M.; Schmidke, B.; Schmitz, N.; Schuster, T. R.; Seele, J.; Seger, J.; Seyboth, P.; Shah, N.; Shahaliev, E.; Shao, M.; Sharma, B.; Sharma, M.; Shi, S. S.; Shou, Q. Y.; Sichtermann, E. P.; Singaraju, R. N.; Skoby, M. J.; Smirnov, D.; Smirnov, N.; Solanki, D.; Sorensen, P.; deSouza, U. G.; Spinka, H. M.; Srivastava, B.; Stanislaus, T. D. S.; Steadman, S. G.; Stevens, J. R.; Stock, R.; Strikhanov, M.; Stringfellow, B.; Suaide, A. A. P.; Suarez, M. C.; Sumbera, M.; Sun, X. M.; Sun, Y.; Sun, Z.; Surrow, B.; Svirida, D. N.; Symons, T. J. M.; Szanto de Toledo, A.; Takahashi, J.; Tang, A. H.; Tang, Z.; Tarini, L. H.; Tarnowsky, T.; Thein, D.; Thomas, J. H.; Tian, J.; Timmins, A. R.; Tlusty, D.; Tokarev, M.; Trentalange, S.; Tribble, R. E.; Tribedy, P.; Trzeciak, B. A.; Tsai, O. D.; Turnau, J.; Ullrich, T.; Underwood, D. G.; Van Buren, G.; van Nieuwenhuizen, G.; Vanfossen, J. A., Jr.; Varma, R.; Vasconcelos, G. M. S.; Videbæk, F.; Viyogi, Y. P.; Vokal, S.; Voloshin, S. A.; Vossen, A.; Wada, M.; Wang, F.; Wang, G.; Wang, H.; Wang, J. S.; Wang, Q.; Wang, X. L.; Wang, Y.; Webb, G.; Webb, J. C.; Westfall, G. D.; Whitten, C., Jr.; Wieman, H.; Wissink, S. W.; Witt, R.; Witzke, W.; Wu, Y. F.; Xiao, Z.; Xie, W.; Xin, K.; Xu, H.; Xu, N.; Xu, Q. H.; Xu, W.; Xu, Y.; Xu, Z.; Xue, L.; Yang, Y.; Yang, Y.; Yepes, P.; Yi, Y.; Yip, K.

2013-04-01

433

Hadronic Symmetries of Skyrmions  

NASA Astrophysics Data System (ADS)

After reviewing the minimal SU(2) Skyrme model, we generalize it to a composite model. The predictions are found to be in good agreement with experiment, and an interpretation of solitons as quarks is suggested. To include vector mesons, we propose a lagrangian such that all the mesons (pseudoscalars and vectors) are treated equally. This model agrees with the usual meson physics and gives a new mass relation among the mesons. After reducing the model to an SU(4) Skyrme model, we introduce a soliton ansatz and find the mass spectra of the solitons. The model is compared with the approach of introducing vector mesons as gauge bosons. These two models are shown to coincide at low energies. We propose a fermionic quantization prescription and obtain a hadronic superalgebra from the Skyrme operators. A possible supersymmetry realization and its implications in the Skyrme model are also discussed. The effective hamiltonian of the semi-relativistic quark model is derived. We discuss the mass spectrum and hadronic symmetries of the quark model and the Skyrme model.

Cheung, Hay Yeung

434

Digital Guide Map Using Tiled Display and Recommendation Function  

Microsoft Academic Search

In this study, digital guide map that uses the tiled display wall was constructed. In the digital guide map used in the shopping mall or shopping street, it is necessary to present the suitable information to the users who visit there without definite purposes. This study aims at constructing the effective digital guide map by combining the functions of presenting

Tetsuro Ogi; Yoshisuke Tateyama; Junichi Kawasaki

2011-01-01

435

Error-Resilient Tile Sets for DNA Self-Assembly  

Microsoft Academic Search

Abstract Experiments have demonstrated that DNA molecules can compute like a machine to solve mathematical problems, which is significant because of their parallel computa- tion ability. However, due to the nature of biochemical reactions, DNA computation suffers from errors, which are its main limitation. The abstract and kinetic Tile As- sembly Models are now commonly used to simulate real DNA

Ya Meng

2009-01-01

436

20. Detail. A view of the glazed tile fireplace which ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

20. Detail. A view of the glazed tile fireplace which was installed into the east wall of the building at an unknown date (it does not appear on the drawings). - John T. Beasley Building, 632 Cherry Street (between Sixth & Seventh Streets), Terre Haute, Vigo County, IN

437

Deterministic algorithm for the reordering problem using tile assembly  

Microsoft Academic Search

Algorithmic self-assembly, a generalization of crystal growth, has been proposed as a mechanism for the bottom-up fabrication of autonomous DNA computation. In theory, growth can be programmed by designing a set of molecular tiles with binding interactions that enforce assembly rules. There are many interesting applications of the reordering problem in Mathematics, as well as Computer Sciences. It is a

Yufang Huang; Jin Xu; Zhen Cheng; Zhihua Chen; Xuncai Zhang

2009-01-01

438

Rapid genome sequencing with short universal tiling probes  

Microsoft Academic Search

The increasing availability of high-quality reference genomic sequences has created a demand for ways to survey the sequence differences present in individual genomes. Here we describe a DNA sequencing method based on hybridization of a universal panel of tiling probes. Millions of shotgun fragments are amplified in situ and subjected to sequential hybridization with short fluorescent probes. Long fragments of

Arno Pihlak; Göran Baurén; Ellef Hersoug; Peter Lönnerberg; Ats Metsis; Sten Linnarsson

2008-01-01

439

Assemble time for self-assembling square tiles  

Microsoft Academic Search

As technology drives components smaller, tradi- tional methods of assembling these components become ever more impractical. Self-assembly is a viable solution in which the individual components autonomously organize themselves without the external guidance of a supervising agent. In this paper we look at the assembly times for various one and two dimensional objects that are assembled with square tiles in

James Solberg

440

Cleaner production of porcelain tile powders. Fired compact properties  

Microsoft Academic Search

A new ceramic powder preparation process, the droplet-powder granulation process (DPGP), was recently proposed for the cleaner production of ceramic tiles. The DPGP granules and resulting pressed compacts were characterized and compared with the granules and compacts obtained by spray-drying (SD) and dry granulation (G) processes in a previous paper. The results showed the feasibility of using the DPGP in

Z. Shu; J. Garcia-Ten; E. Monfort; J. L. Amoros; J. Zhou; Y. X. Wang

441

Global Identification of Human Transcribed Sequences with Genome Tiling Arrays  

Microsoft Academic Search

Elucidating the transcribed regions of the genome constitutes a fundamental aspect of human biology, yet this remains an outstanding problem. To comprehensively identify coding sequences, we constructed a series of high-density oligonucleotide tiling arrays representing sense and antisense strands of the entire nonrepetitive sequence of the human genome. Transcribed sequences were located across the genome via hybridization to complementary DNA

Paul Bertone; Viktor Stolc; Thomas E. Royce; Joel S. Rozowsky; Alexander E. Urban; Xiaowei Zhu; John L. Rinn; Waraporn Tongprasit; Manoj Samanta; Sherman Weissman; Mark Gerstein; Michael Snyder

2004-01-01

442

REACTOR CANAL AFTER IT HAS BEEN TILED. WATER FILLS CANAL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

REACTOR CANAL AFTER IT HAS BEEN TILED. WATER FILLS CANAL PART WAY TO TOP. CAMERA FACES WEST. INL NEGATIVE NO. 3993-A. Unknown Photographer, 12/28/1951 - Idaho National Engineering Laboratory, Test Reactor Area, Materials & Engineering Test Reactors, Scoville, Butte County, ID

443

DMATiler: revisiting loop tiling for direct memory access  

Microsoft Academic Search

In this paper we present the design and implementation of a DMATiler which combines compiler analysis and runtime management to optimize local memory performance. In traditional cache model based loop tiling optimizations, the compiler approximates runtime cache misses as the number of distinct cache lines touched by a loop nest. In contrast, the DMATiler has the full control of the

Haibo Lin; Tao Liu; Huoding Li; Tong Chen; Lakshminarayanan Renganarayanan; John Kevin O'Brien; Ling Shao

2010-01-01

444

Penrose tiling observed in a quasi-crystal  

Microsoft Academic Search

High-resolution electron microscope images of an alloy consisting of aluminum with 14 atomic percent manganese are reported. The images reveal the localized pentagonal pseudosymmetry of the structure and show that it projects as a two-dimensional Penrose tiling. A structural model is derived which is based directly on the experimental images and on an analysis of the polyhedra occurring in the

L. A. Bursill; P. J. Lin

1985-01-01

445

Equilibrium quasicrystal phase of a Penrose tiling model  

NASA Astrophysics Data System (ADS)

A two-dimensional rhombus tiling model with a matching-rule-based energy is analyzed using real-space renormalization-group methods and Monte Carlo simulations. The model spans a range from T=0 quasiperiodic crystal (Penrose tiling) to a random-tiling quasicrystal at high temperatures. A heuristic picture for the disordering of the ground-state quasiperiodicity at low temperatures is proposed and corroborated with exact and renormalization-group calculations of the phason elastic energy, which shows a linear dependence on the strain at T=0 but changes to a quadratic behavior at T>0 and sufficiently small strain. This is further supported by the Monte Carlo result that phason fluctuations diverge logarithmically with system size for all T>0, which indicates the presence of quasi-long-range translational order in the system, meaning algebraically decaying correlations. A close connection between the rhombus tiling model and the general surface-roughening phenomena is established. Extension of the results to three dimensions and their possible implication to experimental systems is also addressed.

Tang, Lei-Han; Jari?, Marko V.

1990-03-01

446

Enhanced reliability in tiled manycore architectures through transparent task relocation  

Microsoft Academic Search

Manycore platforms with tens and even up to hundreds of processing cores per chip are becoming a commercial reality and are subject of intensified research. This concept paper describes work in progress on the applicability of HW supported communication and processing virtualization on regular structured, tiled manycore architectures for the benefit of improved fault tolerance against transient and permanent perturbations.

Holm Rauchfuss; Thomas Wild; Andreas Herkersdorf

2012-01-01

447

DENSITY MAPPING OF CERAMIC TILES BY COMPRESSION-WAVE ULTRASOUND  

Microsoft Academic Search

A range of disc shaped ceramic powder compact samples with controlled densities were produced using manufacturing conditions that mimic those used for industrial tile manufacture. Ultrasonic compression-wave velocity measurements were made, and a straight-line relationship was seen to exist between the ceramic sample bulk density and velocity. This relationship can be used to measure density ultrasonically. This type of relationship

S. D. Aston; R. E. Challis; G. P. Yiasemides

2001-01-01

448

Detail of tile work in lobby. This segment is approximately ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail of tile work in lobby. This segment is approximately in the center of the south wall of the lobby, also seen in photo CA-2724-24. - Jewish Community Center of San Francisco, 3200 California Street, San Francisco, San Francisco County, CA

449

Calibration of the ZEUS Barrel Calorimeter in a Test Beam and a Direct Measurement of the J/psi Leptonic Branching Fraction.  

NASA Astrophysics Data System (ADS)

The ZEUS detector at the DESY e-p collider HERA has started collecting data. It contains a state-of-the -art fully compensating high resolution Uranium-scintillator calorimeter. The American part of the ZEUS collaboration was responsible for the construction of the 32 modules of the Barrel CALorimeter (BCAL) and the readout electronics for the complete calorimeter. A test beam experiment E790 was set up in a fixed-target beamline at Fermilab to test and calibrate the BCAL modules to 1%. The analysis of the test beam data with different incident beams at different energies showed a 1% tower-to-tower uniformity, studied the inter-module and inter-tower responses, and measured a hadron resolution of 35%/sqrt{E} (E in GeV), an electromagnetic resolution of 19%/ sqrt{E}. It also demonstrated the equality of the electromagnetic and the hadronic responses and the linearity of the responses of the calorimeter and the readout electronics. The Mark III collaboration has measured the J/ psi<=ptonic branching fractions using the process psi(3685) to pi^+pi^- J/psi,J/psi to l^+l^-. The results are: B(J/psi to e^+e^-) = (5.92 +/- 0.15 +/- 0.20)% and B(J/psi to mu ^+mu^-) = (5.90 +/- 0.15 +/- 0.19)%, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the J/psi is (5.91 +/- 0.11 +/- 0.20)%. This result is used to obtain the strong coupling constant alpha_{s} and the QCD scale factor Lambda_{overline {MS}}.

Wang, Min-Zu.

450

A simplistic view of hadron calorimetry  

SciTech Connect

All too often we rely on Monte Carlo simulations without worrying too much about basic physics. It is possible to start with a very simple calorimeter (a big cylinder) and learn the functional form of {pi}/e by an induction argument. Monte Carlo simulations provide sanity checks and constants. A power-law functional form describes test beam results surprisingly well. The prediction that calorimeters respond differently to protons and pions of the same energy was unexpected. The effect was later demonstrated by the CMS forward calorimeter group, using the most noncompensating calorimeter ever built. Calorimeter resolution is dominated by fluctuations in {pi}0 production and the energy deposit by neutrons. The DREAM collaboration has recently used a dual readout calorimeter to eliminate the first of these. Ultimate resolution depends on measuring neutrons on an event-by-event basis as well.

Groom, Donald E. [50R6008, Lawrence Berkeley National Laboratory, Berkeley CA 94720 (United States)

2007-03-19

451

Jet-Hadron Correlations in pp and Pb-Pb Collisions with ALICE  

NASA Astrophysics Data System (ADS)

Jet quenching has been observed at both RHIC and LHC energies, indicating that partons lose energy as they traverse the medium. To probe the effects of this partonic energy loss, measurements of the angular correlations between fully reconstructed jets and charged tracks in Pb-Pb collisions are studied. Fully reconstructing a jet provides access to the kinematics of the initial hard scattering while allowing us to study the distribution of hadrons on the away side from the modified recoil jet. Here we present first measurements of jet-hadron correlations in pp collisions at =2.76 TeV and an outlook for Pb-Pb collisions. The jets in this analysis are reconstructed from the 2011 data set using both charged tracks and neutral energy measured in the ALICE tracking system and the electromagnetic calorimeter respectively.

Connors, Megan

2013-09-01

452

Thermal effects on the STAR electromagnetic calorimeter  

SciTech Connect

The STAR detector for the RHIC colliding beam accelerator is under construction at Brookhaven National Laboratory. This detector will consist of a number of subsystems. These include a silicon vertex detector (SVT) for charged particle tracks near the interaction region, a time projection chamber (TPC) for charged particle tracking, an array of plastic scintillation counters (CTB) in a layer around the TPC for triggering on charged particles, a conventional solenoidal magnet, and some additional small triggering detectors along the beam-line. An electromagnetic calorimeter (EMC) is an upgrade to the ``baseline`` detector configuration above. The conventional magnet and numerous electronic channels for the SVT and TPC subsystems will generate a considerable amount of heat during the operation of STAR. However, it is possible that a chiller for the magnet cooling water will not be available during some of the early STAR runs. As a result, the average magnet temperature may vary considerably between winter and summer. This note summarizes calculations and measurements performed to evaluate the effects of an elevated magnet temperature on the performance of the electromagnetic calorimeter.

Fornek, T.; Guarino, V.; Spinka, H.; Underwood, D. [Argonne National Lab., IL (United States). High Energy Physics Div.

1994-07-19

453

Performance of the EBIT calorimeter spectrometer  

SciTech Connect

The EBIT calorimeter spectrometer (ECS) is a new high-resolution, broadband x-ray spectrometer that has recently been installed at the Electron Beam Ion Trap Facility (EBIT) at the Lawrence Livermore National Laboratory. The ECS is an entirely new production class spectrometer that replaces the XRS/EBIT spectrometer that has been operating at EBIT since 2000. The ECS utilizes a 32-pixel x-ray calorimeter array from the XRS instrument on the Suzaku x-ray observatory. Eighteen of the pixels are optimized for the 0.1-10 keV band and yield 4.5 eV full width at half maximum energy resolution and 95% quantum efficiency at 6 keV. In addition, the ECS includes 14 detector pixels that are optimized for the high-energy band with a bandpass from 0.5 to over 100 keV with 34 eV resolution and 32% quantum efficiency at 60 keV. The ECS detector array is operated at 50 mK using a five stage cryogenic system that is entirely automated. The instrument takes data continuously for over 65 h with a 2.5 h recycle time. The ECS is a nondispersive, broadband, highly efficient spectrometer that is one of the prime instruments at the EBIT facility. The instrument is used for studies of absolute cross sections, charge exchange recombination, and x-ray emission from nonequilibrium plasmas, among other measurements in our laboratory astrophysics program.

Porter, Frederick Scott; Gygax, John; Kelley, Richard L.; Kilbourne, Caroline A.; King, Jonathan M. [Code 662, NASA/GSFC, Greenbelt, Maryland 20771 (United States); Beiersdorfer, Peter; Brown, Gregory V.; Thorn, Daniel B. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Kahn, Steven M. [Department of Physics, Stanford University, Stanford, California 94305 (United States)

2008-10-15

454

Performance of the EBIT calorimeter spectrometer.  

PubMed

The EBIT calorimeter spectrometer (ECS) is a new high-resolution, broadband x-ray spectrometer that has recently been installed at the Electron Beam Ion Trap Facility (EBIT) at the Lawrence Livermore National Laboratory. The ECS is an entirely new production class spectrometer that replaces the XRS/EBIT spectrometer that has been operating at EBIT since 2000. The ECS utilizes a 32-pixel x-ray calorimeter array from the XRS instrument on the Suzaku x-ray observatory. Eighteen of the pixels are optimized for the 0.1-10 keV band and yield 4.5 eV full width at half maximum energy resolution and 95% quantum efficiency at 6 keV. In addition, the ECS includes 14 detector pixels that are optimized for the high-energy band with a bandpass from 0.5 to over 100 keV with 34 eV resolution and 32% quantum efficiency at 60 keV. The ECS detector array is operated at 50 mK using a five stage cryogenic system that is entirely automated. The instrument takes data continuously for over 65 h with a 2.5 h recycle time. The ECS is a nondispersive, broadband, highly efficient spectrometer that is one of the prime instruments at the EBIT facility. The instrument is used for studies of absolute cross sections, charge exchange recombination, and x-ray emission from nonequilibrium plasmas, among other measurements in our laboratory astrophysics program. PMID:19044469

Porter, Frederick Scott; Gygax, John; Kelley, Richard L; Kilbourne, Caroline A; King, Jonathan M; Beiersdorfer, Peter; Brown, Gregory V; Thorn, Daniel B; Kahn, Steven M

2008-10-01

455

GEANT SIMULATIONS OF PRESHOWER CALORIMETER FOR CLAS12 UPGRADE OF THE FORWARD ELECTROMAGNETIC CALORIMETER  

SciTech Connect

Hall B at the Thomas Jefferson National Accelerator Facility uses the CEBAF (Continuous Electron Beam Accelerator Facility) Large Acceptance Spectrometer (CLAS) to study the structure of the nucleon. An upgrade from a 6 GeV beam to a 12GeV beam is currently planned. With the beam energy upgrade, more high-energy pions will be created from the interaction of the beam and the target. Above 6GeV, the angle between the two-decay photons of high-energy pions becomes too small for the current electromagnetic calorimeter (EC) of CLAS to differentiate between two photon clusters and single photon events. Thus, a preshower calorimeter will be added in front of the EC to enable fi ner granularity and ensure better cluster separation for all CLAS experiments at higher energies. In order to optimize cost without compromising the calorimeter’s performance, three versions of the preshower, varying in number of scintillator and lead layers, were compared by their resolution and effi ciency. Using GSIM, a GEANT detector simulation program for CLAS, the passage of neutral pions and single photons through CLAS and the new preshower calorimeter (CLAS12 EC) was studied. The resolution of the CLAS12 EC was calculated from the Gaussian fi t of the sampling fraction, the energy CLAS12 EC detected over the Monte Carlo simulated energy. The single photon detection effi ciency was determined from the energy and position of the photon hits. The fractional energy resolution measured was ?E/E = 0.0972 in the fi ve-module version, 0.111 in the four-module version, and 0.149 in the three-module version. Both the fi ve- and four-module versions had 99% single photon detection effi ciency above 0.5GeV while the 3 module version had 99% effi ciency above 1.5GeV. Based on these results, the suggested preshower confi guration is the four-module version containing twelve layers of scintillator and fi fteen layers of lead. This version provides a reasonable balance of resolution, effi ciency, and cost. Additional GSIM simula