Sample records for hadron tile calorimeter

  1. A hadronic tile calorimeter report

    NASA Astrophysics Data System (ADS)

    Boca, Gianluigi; Gourlay, S.; Chung, Yeon Sei; Lee, Kyoung-Beom; Malvezzi, S.; Sala, A.; Arena, V.; Bonomi, G.; Gianini, G.; Merlo, M.; Ratti, S.; Riccardi, C.; Viola, L.; Vitulo, P.

    1998-02-01

    The design and first performances of a new hadronic calorimeter for the experiment Focus (E831) at Fermilab are presented. It is a sampling calorimeter, with 28 iron (passive) and scintillator (active) planes. The active planes are composed of tiles read out by WaveLength Shifter fibers spliced to clear fibers. This is the first tile calorimeter actually used (1997)in a running experiment.

  2. Performance of the ATLAS Hadronic Tile Calorimeter at the LHC Startup

    E-print Network

    Solans, C; The ATLAS collaboration

    2009-01-01

    The Tile hadronic calorimeter is the central hadronic barrel calorimeter of the ATLAS experiment at CERN. Its performance has a direct impact on physics for the LHC start up. Good signal timing is required for good off-detector energy reconstruction, where the digital samples are calibrated to the electromagnetic scale. We present the current status on detector timing with latest results from beam data, initial electronic noise characterization with cosmic data and the status of the energy intercalibration to the electromagnetic scale.

  3. Performance of the ATLAS Hadronic Tile Calorimeter at the LHC Startup

    E-print Network

    Solans, C; The ATLAS collaboration

    2009-01-01

    The Tile hadronic calorimeter is the central hadronic barrel calorimeter of the ATLAS experiment at CERN. Its performance has a direct impact on physics for the LHC start up. Good pulse timing is required for good off-detector energy reconstruction, where the digital samples are calibrated to the electromagnetic scale. We present the current status on detector timing with latest results from beam data, initial electronic noise characterization with cosmic data and the status of the energy intercalibration to the electromagnetic scale.

  4. Signal Reconstruction of the ATLAS Hadronic Tile Calorimeter: implementation and performance

    E-print Network

    Signal Reconstruction of the ATLAS Hadronic Tile Calorimeter: implementation and performance G the ATLAS High Level Trigger with reconstructed PMT signals within the time budget allowed by the First Level Trigger (LVL1) maximum trigger rate of 75 KHz. The signal amplitude, time and a reconstruction

  5. Performance of the ATLAS Tile Hadronic Calorimeter at LHC in Run 1 and planned upgrades

    NASA Astrophysics Data System (ADS)

    Solovyanov, O.

    2014-10-01

    The Tile Calorimeter (TileCal) is the central section of the ATLAS hadronic calorimeter at the Large Hadron Collider, a key detector for the measurements of hadrons, jets, tau leptons and missing transverse energy. Scintillation light produced in the tiles is transmitted by wavelength shifting fibres to photomultiplier tubes (PMTs). The resulting electronic signals from approximately 10000 PMTs are digitized before being transferred to off-detector data-acquisition systems. The data quality procedures used during the LHC data-taking and the evolution of the detector status are explained in the presentation. The energy and the time reconstruction performance of the digitized signals is presented and the noise behaviour and its improvement during the detector consolidation in maintenance periods are shown. A set of calibration systems allow monitoring and equalization of the calorimeter channels responses via signal sources that act at every stage of the signal path, from scintillation light to digitized signal. These partially overlapping systems are described in detail, their individual performance is discussed as well as the comparative results from measurements of the evolution of the calorimeter response with time during the full LHC data-taking period. The TileCal upgrade aims at replacing the majority of the on- and off-detector electronics so that all calorimeter signals will be directly digitized and sent to the off-detector electronics in the counting room. To achieve the required reliability, redundancy has been introduced at different levels. For the off-detector electronics a special pre-processor board is being developed, which will take care of the initial trigger processing, while the main data are temporarily stored in the pipeline and de-randomiser memories.

  6. Calibration and signal reconstruction in the ATLAS Tile Hadronic calorimeter

    E-print Network

    Paris-Sud XI, Université de

    Cal the Optimal Filter (OF) algorithm is used for this purpose; in particular the signal is reconstructed. The digital signal is sent to the Read-Out Drivers (ROD) boards, through op- tical fibers, and here light pulses that are sent to all TileCal PMTs using an optical fiber distribution system. It allows mea

  7. Commissioning of the ATLAS Tile Hadronic Calorimeter with Single Beam and First Collisions

    E-print Network

    Saraiva, J G; The ATLAS collaboration

    2010-01-01

    TileCal, the central hadronic calorimeter of the ATLAS experiment at the CERN Large Hadron Collider (LHC), is built of steel and scintillating tiles with a double readout by optical fibers and uses photomultipliers as photodetectors. It provides measurements for hadrons, jets and missing transverse energy. In recent years TileCal has gone through an intensive commissioning phase. During this period several repairs of the front-end electronic components and low voltage power supplies were made, and all detector channels were fully tested using the dedicated calibration systems: cesium, laser and charge injection. Furthermore, cosmic muons and single beam data were used to verify the performance of the detector and check its readiness for the first collisions in 2009. The work to be presented will focus on the main results of the TileCal pre-collision commissioning phase and on the first results obtained with proton-proton collisions. The first proton-proton collisions at 900 GeV and 2360 GeV took place in the ...

  8. Upgrade of the Laser Calibration System for the ATLAS Hadronic Calorimeter TileCal

    E-print Network

    Van Woerden, Marius Cornelis; The ATLAS collaboration

    2015-01-01

    We present in this contribution the new system for laser calibration of the ATLAS hadronic calorimeter TileCal. The laser system is a part of the three stage calibration apparatus designed to compute the calibration constants of the individual cells of TileCal. The laser system is mainly used to correct for short term (one month) drifts of the readout of the individual cells. A sub-percent accuracy in the control of the calibration constants is required to keep the systematics effects introduced by relative cell miscalibration below the irreducible systematics in determining the parameters of the reconstructed hadronic jets. To achieve this goal in the LHC run II conditions, a new laser system was designed. The architecture of the system is described with details on the new optical line used to distribute laser pulses in each individual detector module and on the new electronics used to drive the laser, to readout the system optical monitors and to interface the system with the Atlas readout, trigger, and slo...

  9. Upgrade of the Laser Calibration System for the ATLAS Hadronic Calorimeter TileCal

    E-print Network

    Van Woerden, Marius Cornelis; The ATLAS collaboration

    2015-01-01

    We present in this contribution the new system for laser calibration of the ATLAS hadronic calorimeter TileCal. The laser system is a part of the three stage calibration apparatus designed to compute the calibration constants of the individual cells of TileCal. The laser system is mainly used to correct for short term (one month) drifts of the readout of the individual cells. A sub-percent accuracy in the control of the calibration constants is required to keep the systematics effects introduced by relative cell miscalibration below the irreducible systematics in determining the parameters of the reconstructed hadronic jets. To achieve this goal in the LHC Run 2 conditions, a new laser system was designed. The architecture of the system is described with details on the new optical line used to distribute laser pulses in each individual detector module and on the new electronics used to drive the laser, to readout the system optical monitors and to interface the system with the Atlas readout, trigger, and slow...

  10. Performance of the ATLAS Tile Calorimeter

    NASA Astrophysics Data System (ADS)

    Heelan, Louise; ATLAS Collaboration

    2015-06-01

    The ATLAS Tile hadronic calorimeter (TileCal) provides highly-segmented energy measurements of incoming particles. It is a key detector for the measurement of hadrons, jets, tau leptons and missing transverse energy. It is also useful for identification and reconstruction of muons due to good signal to noise ratio. The calorimeter consists of thin steel plates and 460,000 scintillating tiles configured into 5000 cells, each viewed by two photomultipliers. The calorimeter response and its readout electronics is monitored to better than 1% using radioactive source, laser and charge injection systems. The calibration and performance of the calorimeter have been established through test beam measurements, cosmic ray muons and the large sample of proton-proton collisions acquired in 2011 and 2012. Results on the calorimeter performance are presented, including the absolute energy scale, timing, noise and associated stabilities. The results demonstrate that the Tile Calorimeter has performed well within the design requirements and it has given essential contribution to reconstructed objects and physics results. In addition, the data quality procedures used during the LHC data-taking are described and the outcome of the detector consolidation in the maintenance period is also presented.

  11. ATLAS Tile Calorimeter electronics and future upgrades

    NASA Astrophysics Data System (ADS)

    Usai, G.

    2015-04-01

    The hadronic calorimeter of the ATLAS experiment at LHC, TileCal, is designed to reconstruct jets, tau-leptons and missing transverse energy. An overview of the calorimeter read-out electronics is given and upgrade plans for the High Luminosity LHC programme in 2024 are discussed. The R&D activities at the different institutes targeting different parts of the TileCal electronics are described, and the status of the first demonstrator prototype built to be installed during the LHC long shutdown in 2014 is summarized.

  12. Description and performance of the FOCUS (E831) hadron calorimeter

    NASA Astrophysics Data System (ADS)

    Arena, V.; Boca, G.; Bonomi, G.; Cheung, H. W. K.; Chung, Y. S.; Gianini, G.; Gourlay, S. A.; Gray, K.; Hansen, S.; Lee, K. B.; Liguori, G.; Malvezzi, S.; Marchesotti, M.; Merlo, M.; Pantea, D.; Ratti, S. P.; Riccardi, C.; Sala, A.; Viola, L.; Vitulo, P.

    1999-02-01

    An iron-scintillator tile calorimeter with tower readout geometry was constructed for the photoproduction experiment FOCUS (E831) at Fermilab. This experiment ran in the 1996-1997 Fermilab-fixed target program using a wide band photon beam with an average energy of 170 GeV. The hadron calorimeter was used in an online trigger. A description of this tile sampling calorimeter is given and its performance described.

  13. Hadronic shower development in Iron-Scintillator Tile Calorimetry

    Microsoft Academic Search

    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

    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

  14. Hadronic Shower Development in Tile Iron-Scintillator Calorimetry

    E-print Network

    Yuri A. Kulchitsky

    1999-10-07

    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 uses a unique longitudinal configuration of scintillator tiles. Using a fine-grained pion beam scan at 100 GeV, a detailed picture of transverse shower behavior is obtained. The underlying radial energy densities for four depth segments and for the entire calorimeter have been reconstructed. A three-dimensional hadronic shower parametrization has been developed. The results presented here are useful for understanding the performance of iron-scintillator calorimeters, for developing fast simulations of hadronic showers, for many calorimetry problems requiring the integration of a shower energy deposition in a volume and for future calorimeter design.

  15. Hadronic Shower Development in Iron-Scintillator Tile Calorimetry

    E-print Network

    Tilecal Atlas Collaboration

    1999-04-29

    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 uses a unique longitudinal configuration of scintillator tiles. Using a fine-grained pion beam scan at 100 GeV, a detailed picture of transverse shower behavior is obtained. The underlying radial energy densities for four depth segments and for the entire calorimeter have been reconstructed. A three-dimensional hadronic shower parametrization has been developed. The results presented here are useful for understanding the performance of iron-scintillator calorimeters, for developing fast simulations of hadronic showers, for many calorimetry problems requiring the integration of a shower energy deposition in a volume and for future calorimeter design.

  16. Readiness of the ATLAS Tile Calorimeter for LHC collisions

    Microsoft Academic Search

    G. Aad; B. Abbott; J. Abdallah; A. A. Abdelalim; A. Abdesselam; O. Abdinov; B. Abi; M. Abolins; H. Abramowicz; H. Abreu; B. S. Acharya; D. L. Adams; 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

    2010-01-01

    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

  17. Hadron calorimeters for future hadron colliders

    SciTech Connect

    Jim Freeman

    2004-01-27

    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.

  18. Readiness of the ATLAS Tile Calorimeter for LHC collisions

    E-print Network

    Aad, Georges; Abdallah, Jalal; Abdelalim, Ahmed Ali; Abdesselam, Abdelouahab; Abdinov, Ovsat; Abi, Babak; Abolins, Maris; Abramowicz, Halina; Abreu, Henso; Acharya, Bobby Samir; Adams, David; Addy, Tetteh; Adelman, Jahred; Adorisio, Cristina; Adragna, Paolo; Adye, Tim; Aefsky, Scott; Aguilar-Saavedra, Juan Antonio; Aharrouche, Mohamed; Ahlen, Steven; Ahles, Florian; Ahmad, Ashfaq; Ahsan, Mahsana; Aielli, Giulio; Akdogan, Taylan; Åkesson, Torsten Paul Ake; Akimoto, Ginga; Akimov , Andrei; Aktas, Adil; Alam, Mohammad; Alam, Muhammad Aftab; Albrand, Solveig; Aleksa, Martin; Aleksandrov, Igor; Alexa, Calin; Alexander, Gideon; Alexandre, Gauthier; Alexopoulos, Theodoros; Alhroob, Muhammad; Aliev, Malik; Alimonti, Gianluca; Alison, John; Aliyev, Magsud; Allport, Phillip; Allwood-Spiers, Sarah; Almond, John; Aloisio, Alberto; Alon, Raz; Alonso, Alejandro; Alviggi, Mariagrazia; Amako, Katsuya; Amelung, Christoph; Amorim, Antonio; Amorós, Gabriel; Amram, Nir; Anastopoulos, Christos; Andeen, Timothy; Anders, Christoph Falk; Anderson, Kelby; Andreazza, Attilio; Andrei, George Victor; Anduaga, Xabier; Angerami, Aaron; Anghinolfi, Francis; Anjos, Nuno; Annovi, Alberto; Antonaki, Ariadni; Antonelli, Mario; Antonelli, Stefano; Antos, Jaroslav; Antunovic, Bijana; Anulli, Fabio; Aoun, Sahar; Arabidze, Giorgi; Aracena, Ignacio; Arai, Yasuo; Arce, Ayana; Archambault, John-Paul; Arfaoui, Samir; Arguin, Jean-Francois; Argyropoulos, Theodoros; Arik, Metin; Armbruster, Aaron James; Arnaez, Olivier; Arnault, Christian; Artamonov, Andrei; Arutinov, David; Asai, Makoto; Asai, Shoji; Silva, José; Asfandiyarov, Ruslan; Ask, Stefan; Åsman, Barbro; Asner, David; Asquith, Lily; Assamagan, Ketevi; Astvatsatourov, Anatoli; Atoian, Grigor; Auerbach, Benjamin; Augsten, Kamil; Aurousseau, Mathieu; Austin, Nicholas; Avolio, Giuseppe; Avramidou, Rachel Maria; Ay, Cano; Azuelos, Georges; Azuma, Yuya; Baak, Max; Bach, Andre; Bachacou, Henri; Bachas, Konstantinos; Backes, Moritz; Badescu, Elisabeta; Bagnaia, Paolo; Bai, Yu; Bain, Travis; Baines, John; Baker, Mark; Baker, Oliver Keith; Baker, Sarah; Baltasar Dos Santos Pedrosa, Fernando; Banas, Elzbieta; Banerjee, Piyali; Banerjee, Swagato; Banfi, Danilo; Bangert, Andrea Michelle; Bansal, Vikas; Baranov, Sergei; Barashkou, Andrei; Barber, Tom; Barberio, Elisabetta Luigia; Barberis, Dario; Barbero, Marlon; Bardin, Dmitri; Barillari, Teresa; Barisonzi, Marcello; Barklow, Timothy; Barlow, Nick; Barnett, Bruce; Barnett, Michael; Baroncelli, Antonio; Barr, Alan; Barreiro, Fernando; Barreiro Guimarães da Costa, João; Barrillon, Pierre; Bartoldus, Rainer; Bartsch, Detlef; Bates, Richard; Batkova, Lucia; Batley, Richard; Battaglia, Andreas; Battistin, Michele; Bauer, Florian; Bawa, Harinder Singh; Bazalova, Magdalena; Beare, Brian; Beau, Tristan; Beauchemin, Pierre-Hugues; Beccherle, Roberto; Bechtle, Philip; Beck, Graham; Beck, Hans Peter; Beckingham, Matthew; Becks, Karl-Heinz; Beddall, Ayda; Beddall, Andrew; Bednyakov, Vadim; Bee, Christopher; Begel, Michael; Behar Harpaz, Silvia; Behera, Prafulla; Beimforde, Michael; Belanger-Champagne, Camille; Bell, Paul; Bell, William; Bella, Gideon; Bellagamba, Lorenzo; Bellina, Francesco; Bellomo, Massimiliano; Belloni, Alberto; Belotskiy, Konstantin; Beltramello, Olga; Ben Ami, Sagi; Benary, Odette; Benchekroun, Driss; Bendel, Markus; Benedict, Brian Hugues; Benekos, Nektarios; Benhammou, Yan; Benjamin, Douglas; Benoit, Mathieu; Bensinger, James; Benslama, Kamal; Bentvelsen, Stan; Beretta, Matteo; Berge, David; Bergeaas Kuutmann, Elin; Berger, Nicolas; Berghaus, Frank; Berglund, Elina; Beringer, Jürg; Bernat, Pauline; Bernhard, Ralf; Bernius, Catrin; Berry, Tracey; Bertin, Antonio; Besana, Maria Ilaria; Besson, Nathalie; Bethke, Siegfried; Bianchi, Riccardo-Maria; Bianco, Michele; Biebel, Otmar; Biesiada, Jed; Biglietti, Michela; Bilokon, Halina; Bindi, Marcello; Bingul, Ahmet; Bini, Cesare; Biscarat, Catherine; Bitenc, Urban; Black, Kevin; Blair, Robert; Blanchard, Jean-Baptiste; Blanchot, Georges; Blocker, Craig; Blondel, Alain; Blum, Walter; Blumenschein, Ulrike; Bobbink, Gerjan; Bocci, Andrea; Boehler, Michael; Boek, Jennifer; Boelaert, Nele; Böser, Sebastian; Bogaerts, Joannes Andreas; Bogouch, Andrei; Bohm, Christian; Bohm, Jan; Boisvert, Veronique; Bold, Tomasz; Boldea, Venera; Bondarenko, Valery; Bondioli, Mario; Boonekamp, Maarten; Bordoni, Stefania; Borer, Claudia; Borisov, Anatoly; Borissov, Guennadi; Borjanovic, Iris; Borroni, Sara; Bos, Kors; Boscherini, Davide; Bosman, Martine; Boterenbrood, Hendrik; Bouchami, Jihene; Boudreau, Joseph

    2010-01-01

    The Tile hadronic calorimeter of the ATLAS detector has undergone extensive testing in the experimental hall since its installation in late 2005. The readout, control and calibration systems have been fully operational since 2007 and the detector successfully collected data from the LHC single beams in 2008 and first collisions in 2009. This paper gives an overview of the Tile Calorimeter performance as measured using random triggers, calibration data, data from cosmic ray muons and single beam data. The detector operation status, noise characteristics and performance of the calibration systems are presented, as well as the validation of the timing and energy calibration carried out with minimum ionising cosmic ray muons data. The calibration systems' precision is well below the design of 1%. The determination of the global energy scale was performed with an uncertainty of 4%.

  19. Calibration and Data Quality systems of the ATLAS Tile Calorimeter during the LHC Run-I operations

    E-print Network

    Zenis, Tibor; The ATLAS collaboration

    2015-01-01

    The Tile Calorimeter is the hadronic calorimeter covering the central region of the ATLAS detector at the LHC. It consists of thin steel plates and scintillating tiles. Wavelength shifting fibres coupled to the tiles collect the produced light and are read out by photomultiplier tubes. The calibration scheme of the Tile Calorimeter comprises Cs radioactive source, laser and charge injection systems. Each stage of the signal production of the calorimeter from scintillation light to digitization is monitored and equalized. Description of the different TileCal calibration systems as well as results on their performance in terms of calibration factors, linearity and stability will be given. The data quality procedures and data quality efficiency of the Tile Calorimeter during the LHC data-taking period are presented as well.

  20. Noise dependency with pile-up in the ATLAS Tile Calorimeter

    E-print Network

    Araque Espinosa, Juan Pedro; The ATLAS collaboration

    2015-01-01

    The Tile Calorimeter, TileCal, is the central hadronic calorimeter of the ATLAS experiment, positioned between the electromagnetic calorimeter and the muon chambers. It comprises alternating layers of steel (as absorber material) and plastic (as active material), known as tiles. Between 2009 and 2012, the LHC has performed better than expected producing proton-proton collisions at a very high rate. These conditions are really challenging when dealing with the energy measurements in the calorimeter since not only the energy from an interesting event will be measured but a component coming from other collisions which are difficult to distinguish from the interesting one will also be present. This component is referred to as pile-up noise. Studies carried out to better understand how pile-up affects noise under different circumstances are described.

  1. The Upgrade of the ATLAS Tile Calorimeter Readout Electronics for Phase II

    NASA Astrophysics Data System (ADS)

    Reed, Robert Graham; the" post="">ATLAS Tile Calorimeter System, Hadron Collider at CERN is scheduled to undergo a major upgrade, called the Phase II Upgrade, in 2022. The ATLAS Tile Calorimeter (TileCal) community will do major modifications to the sub-detector to account for the increased luminosity. More specifically, a large proportion of the current front and back-end electronics will be upgraded in order to digitize all signals generated in the Calorimeters. A Demonstrator program has been established, which combines the current and future architectures, as a proof of principle. The insertion of the first demonstrator is planned for the end of 2015.

  2. The small angle tile calorimeter in the DELPHI experiment

    NASA Astrophysics Data System (ADS)

    Alvsvaag, S. J.; Bari, M.; Barreira, G.; Benvenuti, A. C.; Bigi, M.; Bonesini, M.; Bozzo, M.; Camporesi, T.; Carling, H.; Cassio, V.; Castellani, L.; Cereseto, R.; Chignoli, F.; Della Ricca, G.; Dharmasiri, D. R.; Santo, M. C. Espirito; Falk, E.; Fenyuk, A.; Ferrari, P.; Gamba, D.; Giordano, V.; Gouz, Yu.; Guerzoni, M.; Gumenyuk, S.; Hedberg, V.; Jarlskog, G.; Karyukhin, A.; Klovning, A.; Konoplyannikov, A.; Kronkvist, I.; Lanceri, L.; Leoni, R.; Maeland, O. A.; Maio, A.; Mazza, R.; Migliore, E.; Navarria, F. L.; Negri, P.; Nossum, B.; Obraztsov, V.; Onofre, A.; Paganoni, M.; Pegoraro, M.; Peralta, L.; Petrovykh, L.; Pimenta, M.; Poropat, P.; Prest, M.; Read, A. L.; Romero, A.; Shalanda, N.; Simonetti, L.; Skaali, T. B.; Stugu, B.; Terranova, F.; Tome, B.; Torassa, E.; Trapani, P. P.; Verardi, M. G.; Vallazza, E.; Vlasov, E.; Zaitsev, A.

    1999-04-01

    The Small angle TIle Calorimeter (STIC) provides calorimetric coverage in the very forward region of the DELPHI experiment at the CERN LEP collider. The structure of the calorimeters, built with a so-called "shashlik" technique, gives a perfectly hermetic calorimeter and still allows for the insertion of tracking detectors within the sampling structure to measure the direction of the showering particle. A charged-particle veto system, composed of two scintillator layers, makes it possible to trigger on single photon events and provides e-? separation. Results are presented from the extensive studies of these detectors in the CERN testbeams prior of installation and of the detector performance at LEP.

  3. Quality Factor for the Hadronic Calorimeter in High Luminosity Conditions

    NASA Astrophysics Data System (ADS)

    Seixas, J. M.; the" post="">ATLAS Tile Calorimeter System, Tile Calorimeter (TileCal) is the central section of the hadronic calorimeter of ATLAS experiment of the Large Hadron Collider (LHC) and has about 10,000 eletronic channels. An Optimal Filter (OF) has been used to estimate the energy sampled by the calorimeter and applies a Quality Factor (QF) for signal acceptance. An approach using Matched Filter (MF) has also been pursued. In order to cope with the luminosity rising foreseen for LHC operation upgrade, different algorithms have been developed. Currently, the OF measurement for signal acceptance is implemented through a chi-square test. At a low luminosity scenario, such QF measurement has been used as a way to describe how the acquired signal is compatible to the pulse shape pattern. However, at high-luminosity conditions, due to pile up, this QF acceptance is no longer possible when OF is employed, and the QF becomes a measurement to indicate whether the reconstructed signal suffers or not from pile up. Methods are being developed in order to recover the superimposed information, and the QF may be used again as signal acceptance criterion. In this work, a new QF measurement is introduced. It is based on divergence statistics, which measures the similarity of probability density functions.

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

    SciTech Connect

    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

    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.

  5. ATLAS Tile Calorimeter Readout Electronics Upgrade Program for the High Luminosity LHC

    E-print Network

    A. S. Cerqueira

    2013-05-03

    The Tile Calorimeter (TileCal) is the hadronic calorimeter covering the most central region of the ATLAS experiment at LHC. The TileCal readout consists of about 10000 channels. The ATLAS upgrade program is divided in three phases: The Phase~0 occurs during 2013-2014, Phase~1 during 2018-1019 and finally Phase~2, which is foreseen for 2022-2023, whereafter the peak luminosity will reach 5-7 x 10$^{34}$ cm$^2$s$^{-1}$ (HL-LHC). The main TileCal upgrade is focused on the Phase~2 period. The upgrade aims at replacing the majority of the on- and off-detector electronics so that all calorimeter signals are directly digitized and sent to the off-detector electronics in the counting room. All new electronics must be able to cope with the increased radiation levels. An ambitious upgrade development program is pursued to study different electronics options. Three options are presently being investigated for the front-end electronic upgrade. The first option is an improved version of the present system built using commercial components, the second alternative is based on the development of a dedicated ASIC (Application Specific Integrated Circuit) and the third is the development of a new version of the QIE (Charge Integrator and Encoder) based on the one developed for Fermilab. All three options will use the same readout and control system using high speed (up to 40 Gb/s) links for communication and clock synchronization. For the off-detector electronics a new back-end architecture is being developed. A demonstrator prototype read-out for a slice of the calorimeter with most of the new electronics, but still compatible with the present system, is planned to be inserted in ATLAS already in mid 2014 (at the end of the Phase~0 upgrade).

  6. Upgrade fo the CMS Hadron Outer Calorimeter with SIPMs

    SciTech Connect

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

    2011-09-14

    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.

  7. The Hadron Calorimeter for the ACCESS Mission

    NASA Astrophysics Data System (ADS)

    Isbert, Joachim

    ACCESS is a cosmic ray experiment presently under study for a possible accommodation as a Space Station attached payload. It is aimed at new measurements in several key areas of particle astrophysics that require the use of relatively large and heavy detectors in space. The scientific objectives include studies of nucleosynthesis and acceleration processes at the cosmic ray sources, determination of galactic propagation at high energies, and a search for characteristic changes of the cosmic ray spectra up to the "knee" region. The instrumentation will include a detector for ultraheavy cosmic rays (ZIM), a transition radiation detector (TRD) for measurements of energy spectra of primary and secondary cosmic ray nuclei (Z?3) up to about 1015 eV, and a hadron calorimeter for observations of protons, helium and light nuclei up to 50 TeV/nucleon. The hadron calorimeter section of the ACCESS instrument is composed of a silicon matrix detector, a scintillator hodoscope, a graphite target section of about 1 proton interaction length and a totally active ionization calorimeter section composed of BGO crystals of approximately 27 radiation lengths depth. The ACCESS calorimeter detectors are read out with photomultipliers in the hodoscope section and with photodiodes in the BGO crystals. The readout of the detectors is accomplished by utilizing ASICs and custom designed, space qualified electronics.

  8. Operational Experience and First Results with a Highly Granular Tungsten Analog Hadron Calorimeter

    E-print Network

    Frank Simon; for the CALICE Collaboration

    2011-11-22

    Precision physics at future multi-TeV lepton colliders such as CLIC requires excellent jet energy resolution. The detectors need deep calorimeter systems to limit the energy leakage also for very highly energetic particles and jets. At the same time, compact physical dimensions are mandatory to permit the installation of the complete calorimeter system inside high-field solenoidal magnets. This requires very dense absorbers, making tungsten a natural choice for hadron calorimeters at such a future collider. To study the performance of such a calorimeter, a physics prototype with tungsten absorbers and scintillator tiles with SiPM readout as active elements has been constructed and has been tested in particle beams at CERN over a wide energy range from 1 GeV to 300 GeV. We report on the construction and on the operational experience obtained with muon, electron and hadron beams.

  9. The time structure of hadronic showers in highly granular calorimeters with tungsten and steel absorbers

    NASA Astrophysics Data System (ADS)

    Adloff, C.; Blaising, J.-J.; Chefdeville, M.; Drancourt, C.; Gaglione, R.; Geffroy, N.; Karyotakis, Y.; Koletsou, I.; Prast, J.; Vouters, G.; Repond, J.; Schlereth, J.; Xia, L.; Baldolemar, E.; Li, J.; Park, S. T.; Sosebee, M.; White, A. P.; Yu, J.; Eigen, G.; Thomson, M. A.; Ward, D. R.; Benchekroun, D.; Hoummada, A.; Khoulaki, Y.; Apostolakis, J.; Arfaoui, S.; Benoit, M.; Dannheim, D.; Elsener, K.; Folger, G.; Grefe, C.; Ivantchenko, V.; Killenberg, M.; Klempt, W.; van der Kraaij, E.; Linssen, L.; Lucaci-Timoce, A.-I.; Münnich, A.; Poss, S.; Ribon, A.; Roloff, P.; Sailer, A.; Schlatter, D.; Sicking, E.; Strube, J.; Uzhinskiy, V.; Cârloganu, C.; Gay, P.; Manen, S.; Royer, L.; Cornett, U.; David, D.; Ebrahimi, A.; Falley, G.; Feege, N.; Gadow, K.; Göttlicher, P.; Günter, C.; Hartbrich, O.; Hermberg, B.; Karstensen, S.; Krivan, F.; Krüger, K.; Lu, S.; Lutz, B.; Morozov, S.; Morgunov, V.; Neubüser, C.; Reinecke, M.; Sefkow, F.; Smirnov, P.; Terwort, M.; Fagot, A.; Tytgat, M.; Zaganidis, N.; Hostachy, J.-Y.; Morin, L.; Garutti, E.; Laurien, S.; Marchesini, I.; Matysek, M.; Ramilli, M.; Briggl, K.; Eckert, P.; Harion, T.; Schultz-Coulon, H.-Ch; Shen, W.; Stamen, R.; Chang, S.; Khan, A.; Kim, D. H.; Kong, D. J.; Oh, Y. D.; Bilki, B.; Norbeck, E.; Northacker, D.; Onel, Y.; Wilson, G. W.; Kawagoe, K.; Miyazaki, Y.; Sudo, Y.; Ueno, H.; Yoshioka, T.; Dauncey, P. D.; Cortina Gil, E.; Mannai, S.; Baulieu, G.; Calabria, P.; Caponetto, L.; Combaret, C.; Della Negra, R.; Eté, 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.; Berenguer Antequera, J.; 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.; Rusinov, V.; Tarkovsky, E.; Kozlov, V.; Soloviev, Y.; Besson, D.; Buzhan, P.; Ilyin, A.; Kantserov, V.; Kaplin, V.; Popova, E.; Tikhomirov, V.; Gabriel, M.; Kiesling, C.; Seidel, K.; Simon, F.; Soldner, C.; Szalay, M.; Tesar, M.; Weuste, L.; Amjad, M. S.; Bonis, J.; Conforti di Lorenzo, S.; Cornebise, P.; Fleury, J.; Frisson, T.; van der Kolk, N.; Richard, F.; Pöschl, R.; Rouëné, J.; Anduze, M.; Balagura, V.; Becheva, E.; Boudry, V.; Brient, J.-C.; Cornat, R.; Frotin, M.; Gastaldi, F.; Guliyev, E.; Haddad, Y.; Magniette, F.; Ruan, M.; Tran, T. H.; Videau, H.; Callier, S.; Dulucq, F.; Martin-Chassard, G.; de la Taille, Ch; Raux, L.; Seguin-Moreau, N.; 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.; Ono, H.; Takeshita, T.; Uozumi, S.; Chai, J. S.; Song, H. S.; Lee, S. H.; Götze, M.; Sauer, J.; Weber, S.; Zeitnitz, C.

    2014-07-01

    The intrinsic time structure of hadronic showers influences the timing capability and the required integration time of hadronic calorimeters in particle physics experiments, and depends on the active medium and on the absorber of the calorimeter. With the CALICE T3B experiment, a setup of 15 small plastic scintillator tiles read out with Silicon Photomultipliers, the time structure of showers is measured on a statistical basis with high spatial and temporal resolution in sampling calorimeters with tungsten and steel absorbers. The results are compared to GEANT4 (version 9.4 patch 03) simulations with different hadronic physics models. These comparisons demonstrate the importance of using high precision treatment of low-energy neutrons for tungsten absorbers, while an overall good agreement between data and simulations for all considered models is observed for steel.

  10. Production summary for extended barrel module fabrication at Argonne for the ATLAS tile calorimeter.

    SciTech Connect

    Guarino, V.; Hill, N.; Petereit, E.; Skrzecz, F.; Wood, K.; Proudfoot, J.; Anderson, S.; Caird, A.; Keyser, C.; Kocenko, L.; Matijas, Z.; Nephew, T.; Stanek, R.; Franchini, F.; High Energy Physics

    2007-11-14

    The Tile Calorimeter is one of the main hadronic calorimeters to be used in the ATLAS experiment at CERN [1,2]. It is a steel/scintillator sampling calorimeter which is built by stacking 64 segments in azimuth and 3 separate cylinders to provide a total structure whose length is approximately 12m and whose diameter is a little over 8.4m. It has a total weight of about 2630 metric tons. Important features of this calorimeter are: A minimum gap (1.5mm) between modules in azimuth; Pockets in the structure to hold the scintillator tiles; Recessed channels at the edges of the module into which the readout fibers will sit; and Holes in the structure through which a radioactive source will pass. The mechanical structure for one of the 3 calorimeter sections, the Extended Barrel (EBA) was constructed at Argonne. A schematic of the calorimeter sampling structure and the layout of one of the 64 segments, termed a module, are shown in figure 1. Each module comprises mechanically of a precision machined, structural girder to which 10 submodules are bolted. One of these submodules, the ITC, has a customized shape to accommodate services for other detector elements. Each submodule weighs 850Kg and the assembled mechanical structure of the module weighs approximately 9000Kg (a fully instrumented Extended Barrel modules weighs {approx}9600Kg). A crucial issue for the tile calorimeter assembly is the minimization of the un-instrumented gap between modules when they are stacked on top of each other during final assembly. The design goal was originally 1mm gap which was eventually relaxed to 1.5mm following a careful evaluation of all tolerances in the construction and assembly process as shown in figure 2 [3]. Submodules for this assembly were produced at 4 locations [4] using tooling and procedures which were largely identical [5]. An important issue was the height of each submodule on the stacking fixture on which they were fabricated as this defines the length along the girder for installation, with a design gap between submodules on the girder of 0.3mm. During production we relaxed this tolerance to +0.3, -1.5mm. The height summary for submodules used at Argonne is shown in Appendix I. About 10 submodules fell outside the positive height envelope (due to the raw plate thickness being out of specification) and we constructed some custom short submodules to allow their use in module assembly. The structural girders were produced commercially following the Quality Control plan agreed to with the Tile Calorimeter collaboration and shipped to Argonne. The crucial tolerances on the girder are the key into which submodules are placed as well as the flatness of the key surface which are used in aligning submodules such that the azimuthal surface lies wholly an envelope of +0.75mm from nominal [6]. Another important characteristic of the girder are clearance holes through which the wavelength shift fibers pass to couple the light to photomultipliers located inside the girder, as described in [2]. Since these fiber bundles must be located to high precision, rather than position the holes in the steel to this precision, tooling was developed by which the precision pieces are glued into the girder [7]. This is shown in figure 3. More details on the pieces used to accomplish this interface to the readout electronics are discussed in [2].

  11. A Scintillator tile-fiber preshower detector for the CDF Central Calorimeter

    SciTech Connect

    S. Lami

    2004-08-12

    The front face of the CDF central calorimeter is being equipped with a new Preshower detector, based on scintillator tiles read out by WLS fibers. A light yield of about 40 pe/MIP at the tile exit was obtained, exceeding the design requirements.

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

    SciTech Connect

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

    1991-08-14

    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.

  13. LASER Monitoring system for the ATLAS Tile Calorimeter , for the LPC ATLAS group

    E-print Network

    Paris-Sud XI, Université de

    choice toward a commercial Q-switched DPSS (Diode-Pumped Solid State) LASER manufactured by SPECTRA-PHYSICS outgoing the LASER box is brought via a 1m long liquid fiber towards a first beam-splitter. This splitterLASER Monitoring system for the ATLAS Tile Calorimeter S. Vireta , for the LPC ATLAS group a

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

    NASA Astrophysics Data System (ADS)

    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

    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.

  15. A warm-liquid calorimeter for cosmic-ray hadrons

    NASA Astrophysics Data System (ADS)

    Engler, J.; Fessler, F.; Hörandel, J. R.; Holst, T.; Keim, H.; Mathes, H. J.; Mielke, H. H.; Milke, J.; Raidt, U.; Wochele, J.

    1999-05-01

    An iron sampling calorimeter for cosmic-ray hadrons used in the centre of a large air shower experiment is described. The iron absorber is interspersed with eight layers of ionisation chambers filled with the room-temperature liquids tetramethylsilane and tetramethylpentane. Experiences gained from the calorimeter, its performance and long-term stability are presented. For energies in the TeV range shower profiles and transition curves have been measured and are compared with Monte Carlo calculations employing the FLUKA code. Good agreement has been found except in the lateral halo region. In the outer regions the energy deposition found is smaller than that obtained by the simulations.

  16. Hadron shower decomposition in a highly granular calorimeter

    NASA Astrophysics Data System (ADS)

    Chadeeva, Marina; CALICE Collaboration

    2015-02-01

    The spatial development of showers induced by positive hadrons with momenta 10-80 GeV in the highly granular CALICE scintillator-steel analogue hadronic calorimeter is analysed. The parametrisation of both longitudinal and radial shower profiles with the two- component functions are fit to the test beam data and simulations using the physics lists QGSP_BERT and FTFP_BERT from GEANT4 version 9.6 patch 01. The shower parameters, describing the longitudinal tail and radial halo, are in good agreement between data and simulations and are similar for pions and protons. For the longitudinal development, the most significant difference between data and simulations is in the relative containment of the separated components. For the radial development, the core slope parameter is underestimated by simulations. The physics list FTFP_BERT gives a very good description of proton showers in the studied energy range and gives better predictions of the pion shower development than QGSP_BERT.

  17. Imaging pion showers with the CALICE analogue hadron calorimeter

    SciTech Connect

    Feege, N. [Inst. for Experimental Physics, Univ. of Hamburg, Hamburg (Germany); DESY, Hamburg (Germany)

    2011-07-01

    The CALICE collaboration investigates different technology options for highly granular calorimeters for detectors at a future electron-positron collider. One of the devices constructed and tested by the collaboration is a 1 m{sup 3} prototype for an imaging scintillator-steel sampling calorimeter for hadrons with analogue readout (AHCAL). The light from 7608 small scintillator cells is detected with silicon photomultipliers. The AHCAL has been successfully operated during electron and hadron test-beam measurements at DESY, CERN, and Fermilab since 2005. The collected data allow for evaluating the novel technologies employed. In addition, these data provide a valuable basis for validating pion cascade simulations. This paper presents the current status of comparisons between the AHCAL data and predictions from different Monte Carlo models implemented in GEANT4. The comparisons cover the total visible energy, longitudinal and radial shower profiles, and the shower substructure. Furthermore, this paper discusses a software compensation algorithm for improving the energy resolution of the AHCAL for single pions. (authors)

  18. A hadronic calorimeter with Glass RPC as sensitive medium

    NASA Astrophysics Data System (ADS)

    Grenier, G.

    2014-09-01

    The SDHCAL technological prototype is a 1 × 1 × 1.3 m3 high-granularity Semi-Digital Hadronic CALorimeter using Glass Resistive Plate Chambers as sensitive medium. It is one of the two HCAL options considered by the ILD Collaboration to be proposed for the detector of the future International Linear Collider project. The prototype is made of up to 50 GRPC detectors of 1 m2 size and 3 mm thickness each with an embedded semi-digital electronics readout that is autotriggering and power-pulsed. The GRPC readout is finely segmented into pads of 1 cm2. Measured performances of the GRPC and the full SDHCAL prototype in terms of homogeneity, low noise and energy resolution are presented in this proceeding.

  19. A New scintillator tile / fiber preshower detector for the CDF central calorimeter

    SciTech Connect

    Gallinaro, Michele; /Rockefeller U.; Artikov, A.; Bromberg, C.; Budagov, J.; Byrum, K.; Chang, S.; Chlachidze, G.; Goulianos, K.; Huston, J.; Iori, M.; Kim, M.; Kuhlmann,; Lami, S.; Lindgren, M.; Lytken, E.; Miller, R.; Nodulman, L.; Pauletta, G.; Penzo, A.; Proudfoot, J.; Roser, R.; /Argonne /Dubna, JINR /Fermilab /Kyungpook Natl. U. /Michigan

    2004-11-01

    A detector designed to measure early particle showers has been installed in front of the central CDF calorimeter at the Tevatron. This new preshower detector is based on scintillator tiles coupled to wavelength-shifting fibers read out by multianode photomultipliers and has a total of 3,072 readout channels. The replacement of the old gas detector was required due to an expected increase in instantaneous luminosity of the Tevatron collider in the next few years. Calorimeter coverage, jet energy resolution, and electron and photon identification are among the expected improvements. The final detector design, together with the R&D studies that led to the choice of scintillator and fiber, mechanical assembly, and quality control are presented. The detector was installed in the fall 2004 Tevatron shutdown and is expected to start collecting colliding beam data by the end of 2004. First measurements indicate a light yield of 12 photoelectrons/MIP, a more than two-fold increase over the design goals.

  20. Development of a small angle hadron calorimeter prototype for the Collider Detector at Fermilab 

    E-print Network

    Thane, John Mark

    1989-01-01

    DEVELOPMENT OF A SMALL ANGLE HADRON CALORIMETER PROTOTYPE FOR THE COLLIDER DETECTOR AT FERMILAB A Thesis by JOHN MARK THANE Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE August 1989 Major Subject: Physics DEVELOPMENT OF A SMALL ANGLE HADRON CALORIMETER PROTOTYPE FOR THE COLLIDER DETECTOR AT FERMILAB A Thesis by JOHN MARK THANE Approved as to style and content by: aryl D. i...

  1. Hadronic Shower Validation Experience for the ATLAS End-Cap Calorimeter

    SciTech Connect

    Kiryunin, A. E.; Salihagic, D. [Max-Planck-Institut fuer Physik, Werner-Heisenberg-Institut, Foehringer Ring 6, 80805 Munich (Germany)

    2007-03-19

    Validation of GEANT4 hadronic physics models is carried out by comparing experimental data from beam tests of modules of the ATLAS end-cap calorimeters 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 response for charged pions and shapes of showers are studied. Comparison with GEANT3 predictions is done as well.

  2. Construction of a hadron calorimeter for Jefferson Lab Hall-A Super Bigbite Spectrometer

    NASA Astrophysics Data System (ADS)

    Mamyan, Vahe

    2015-04-01

    A ``shashlik'' hadron calorimeter is being constructed for the new Super Bigbite Spectrometer in Jefferson Lab Hall-A. The calorimeter will be used in nucleon-coincidence form-factor experiments taking advantage of Jefferson Labs' 12 GeV upgrade. An adiabatic light guide has been developed for the calorimeter based on laser cut acrylic sheets. A prototype module has been built to measure time resolution of the calorimeter for cosmic ray muons as well as to validate the Geant4 simulation. Several innovations in the calorimeter design will be discussed, in particular the choice of the scintillator, wave length shifter and the construction process of the light. The results of prototype tests is compared with Geant4 simulation for cosmic ray muons and prediction of HCal time and special resolution for hadrons in the 2-10 GeV/c momentum range will be presented. SBS COLLABORATION.

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

    SciTech Connect

    Yeh, G.P.; /Fermilab

    2010-01-01

    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.

  4. The CMS central hadron calorimeter DAQ system upgrade

    NASA Astrophysics Data System (ADS)

    Whitbeck, A.; Hirschauer, J.

    2015-05-01

    The CMS central hadron calorimeters will undergo a complete replacement of their data acquisition system electronics. The replacement is phased, with portions of the replacement starting in 2014 and continuing through LHC Long Shutdown 2 in 2018. The existing VME electronics will be replaced with a ?TCA-based system. New on-detector QIE electronics cards will transmit data at 4.8 GHz to the new ?HTR cards residing in ?TCA crates in the CMS electronics cavern. The ?TCA crates are controlled by the AMC13, which accepts system clock and trigger throttling control from the CMS global DAQ system. The AMC13 distributes the clock to the ?HTR and reads out data buffers from the ?HTR into the CMS data acquisition system. The AMC 13 also provides the clock for in-crate GLIBs which in turn distribute the clock to the on-detector front end electronics. We report on the design, development status, and schedule of the DAQ system upgrades.

  5. Tiling

    NSDL National Science Digital Library

    2010-09-22

    This interactive simulation allows students to create their own tiles and make patterns with them. The standard tile is rectangular, but the "Make Shape" button allows a custom tile to be made in a number of a different colors. Tiles can be rotated by intervals of 90 degrees and students can make interesting patterns and tessellations with them.

  6. Radiation hardness of plastic scintillators for the Tile Calorimeter of the ATLAS detector

    NASA Astrophysics Data System (ADS)

    Jivan, H.; Mellado, B.; Sideras-Haddad, E.; Erasmus, R.; Liao, S.; Madhuku, M.; Peters, G.; Solvyanov, O.

    2015-06-01

    The radiation damage in polyvinyl toluene based plastic scintillator EJ200 obtained from ELJEN technology was investigated. This forms part of a comparative study conducted to aid in the upgrade of the Tile Calorimeter of the ATLAS detector during which the Gap scintillators will be replaced. Samples subjected to 6 MeV proton irradiation using the tandem accelerator of iThemba LABS, were irradiated with doses of approximately 0.8 MGy, 8 MGy, 25 MGy and 80 MGy. The optical properties were investigated using transmission spectroscopy whilst structural damage was assessed using Raman spectroscopy. Findings indicate that for the dose of 0.8 MGy, no structural damage occurs but a breakdown in the light transfer between base and fluor dopants is observed. For doses of 8 MGy to 80 MGy, structural damage leads to hydrogen loss in the benzene ring of the PVT base which forms free radicals. This results in an additional absorptive component causing increased transmission loss as dose is increased.

  7. A calorimeter for cosmic ray hadrons up to 10 TeV

    NASA Astrophysics Data System (ADS)

    Mielke, H. H.; Kornmayer, H.; Locher, M.; Engler, J.; Knapp, J.; Keim, H.

    1995-02-01

    An iron calorimeter for cosmic ray hadrons to be used in a large air shower experiment is described. The iron absorber is interspersed with ionization chambers filled with the room temperature liquid tetramethylsilane. Experiences with the calorimeter, its performance and long-term stability are presented. For energies in the TeV region shower profiles and transition curves have been measured and are compared with Monte Carlo calculations using the Fluka and Gheisha codes.

  8. Quartz Plate Calorimeter as SLHC Upgrade to CMS Hadronic Endcap

    E-print Network

    Akgun, Ugur

    , CALOR 2008, Pavio, Italy 3 #12;Current Design: "Scintillators" · Megatiles of large scintillator sheets, CALOR 2008, Pavio, Italy 1 (on behalf of CMS Collaboration) #12;Outline · Introduction · Radiation on Cerenkov Light Collection on Quartz Plates. · Quartz Plate Calorimeter Prototype ­ I · Radiation Hard Light

  9. Degradation of resolution in a homogeneous dual-readout hadronic calorimeter

    NASA Astrophysics Data System (ADS)

    Groom, Donald E.

    2013-03-01

    If the scintillator response to a hadronic shower in a semi-infinite uniform calorimeter structure is S relative to the electronic response, then S/E=[fem+(1-fem)(h/e)], where E is the incident hadron energy, fem is the electronic shower fraction, and h/e is the hadron/electron response ratio. If there is also a simultaneous readout with a different h/e, say a Cherenkov signal C, then a linear combination of the two signals provides an estimator of E that is proportional to the incident energy and whose distribution is nearly Gaussian—even though the S and C distributions are non-linear in E, wide, and skewed. Since an estimator of fem is also obtained, it is no longer a stochastic variable. Much of the remaining resolution variance is due to sampling fluctuations. These can be avoided in a homogeneous calorimeter. The energy resolution depends upon the contrast in h/e between the two channels. h/e is small in the Cherenkov channel. Mechanisms that increaseh/ein sampling calorimeters with organic scintillator readout are not available in a homogeneous inorganic scintillator calorimeter. The h/e contrast is very likely too small to provide the needed energy resolution.

  10. First level calorimeter trigger system for the Large Hadron Collider

    SciTech Connect

    Eisenhandler, E. (Univ. of London (United Kingdom). Queen Mary and Westfield Coll.); Gee, N.; Gillman, A.; Perera, V.; Quinton, S. (Rutherford Appleton Lab. (United Kingdom)); Ellis, N.; Fensome, I.; Garvey, J.; Jovanovic, P.; Staley, R.; Watson, A. (Univ. of Birmingham (United Kingdom))

    1993-08-01

    As part of an R and D project to study first-level calorimeter triggers for LHC, the authors have designed an Application Specific integrated Circuit (ASIC) which will search for candidate electromagnetic (EM) clusters associated with a particular cell from a 4 x 4 area of the calorimeter. The ASIC takes in sixteen (4 x 4) 8-bit digitized signals from the calorimeter and will provide two results: (1) a flag to indicate the presence of an EM cluster.;(2) a sum over the 4 x 4 area which will be used in the subsequent logic in the trigger system to search for jets and to calculate missing transverse energy. In LHC the bunch-crossing period is 15 ns, and therefore the logic is implemented on the ASIC using a pipelined architecture, with pipeline steps of 15 ns. The algorithm has been implemented on a 0.8 micron CMOS gate array, and is packaged in a 179 pin ceramic Pin Grid Array. The ASIC has been tested above the full operating frequency of 67 MHz.

  11. A silicon hadron calorimeter module operated in a strong magnetic field with VLSI read out for LHC

    E-print Network

    Carminati, F; Giani, S; Glaser, M; Hervé, A; Le Goff, J M; Lemeilleur, F; Pimiä, M; Radermacher, E; Verweij, H; Baturitsky, M A; Chalyshev, V; Cheremuhin, A E; Eidelman, B; Eremin, V V; Golubyh, S M; Golutvin, I A; Ivanjutin, L; Izhevsky, V; Kalagin, I V; Kharlamov, V M; Kozlov, Yu Z; Kuchinskii, P; Lomako, V M; Losanu, S; Lukyanov, I; Makarov, S; Merkin, I; Milvidskii, M G; Minashkin, V F; Peshekhonov, V D; Petrov, V; Rasshevsky, A; Savin, I A; Sergeev, S; Shumeiko, N M; Sidorov, A; Susova, N Y; Vasilescu, A; Verbitskaya, E; Yaremchuk, A I; Yavid, V; Zamyatin, N I; Zhiltsov, V E; Zubarev, V N; Zverolovlev, V; Baldini, A; Bocciolini, M; Borchi, E; Cartacci, A M; Civinini, C; D'Alessandro, R; Gallo, E; Meschini, M; Pieri, M; Spillantini, P; Acciarri, M; Avanzini, P G; Baschirotto, A; Benetti, S; Cai, G; Castello, R; Furetta, C; Gola, A; Menniti, P; Paludetto, R; Pensotti, S; Pizzini, S; Rancoita, P G; Rattaggi, M; Terzi, G; Brashear, H R; Britton, C L; Cohn, H O; Todd, R; Barone, L; Borgia, B; Diemoz, M; Longo, E; Organtini, G; Berridge, P K; Berridge, S C; Bugg, W M; Du, Y C; Hargis, H J; Kroeger, R A; Tsveybak, I; Weidemann, A W; Szoncsó, F; Walzel, G; Wulz, Claudia Elisabeth; CERN. Geneva. Detector Research and Development Committee

    1992-01-01

    On the basis of a cost-optimized technology of Silicon detector production we propose to build a prototype of LHC calorimeter module. This calorimeter module will include signal routing, mounting boards, complete front-end electronics including tower sums and pipeline storage and digitization. It will be tested in a strong magnetic field in a beam containing electrons, hadrons and muons.

  12. Study of Solid State Photon Detectors Read Out of Scintillator Tiles

    E-print Network

    A. Calcaterra; R. de Sangro; G. Finocchiaro; E. Kuznetsova; P. Patteri; M. Piccolo

    2009-01-14

    We present preliminary results on efficiency and light collection uniformity read out performances of different assemblies of scintillator tiles, coupled with solid state photon detectors of different make. Our test beam data suggest that the use of 2 mm scintillator tiles without wavelength shifting fibers may be possible in an ILC hadron calorimeter.

  13. Hadronic Calorimeter Shower Size: Challenges and Opportunities for Jet Substructure in the Superboosted Regime

    E-print Network

    Bressler, Shikma; Kats, Yevgeny; Lee, Seung J; Perez, Gilad

    2015-01-01

    Hadrons have finite interaction size with dense material, a basic feature common to known forms of hadronic calorimeters (HCAL). We argue that substructure variables cannot use HCAL information to access the microscopic nature of jets narrower than the hadronic shower size, which we call superboosted massive jets. It implies that roughly 15% of their transverse energy profile remains inaccessible due to the presence of long-lived neutral hadrons. This unreachable part of the jet substructure is also subject to order-one fluctuations. We demonstrate that the effects of the fluctuations are not reduced when a global correction to jet variables is applied. The above leads to fundamental limitations in the ability to extract intrinsic information from jets in the superboosted regime. The neutral fraction of a jet is correlated with its flavor. This leads to an interesting and possibly useful difference between superboosted W/Z/h/t jets and their corresponding backgrounds. The QCD jets that form the background to ...

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

    NASA Astrophysics Data System (ADS)

    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

    Occasionally cosmic-ray induced air showers result in single, unaccompanied hadrons at ground level. Such events are investigated with the 300 m 2 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.

  15. High-pT hadronic trigger using electromagnetic calorimeter with the STAR detector

    NASA Astrophysics Data System (ADS)

    Da, Hongyu; Cui, Xiangli; Xu, Yichun; Dong, Xin; Dunlop, James C.; Ruan, Lijuan; Tang, Zebo; Timmins, Anthony; Van Buren, Gene; Wang, Xiaolian; Xu, Zhangbu

    2013-01-01

    We derive a new method to improve the statistics of identified particles at high transverse momentum (pT) using online-triggered events by the STAR Barrel electro-magnetic-calorimeter (BEMC) detector. The BEMC is used to select charged hadrons (?±,K±, and p(p¯)) via hadronic shower energy deposited in the BEMC. With this trigger, the statistics of the high pT particles are significantly enhanced (by a factor of up to ˜100 for STAR) with trigger efficiency up to 20%. In addition, weak-decay V0s (KS0 and ?(?¯)) can be reconstructed by selecting the BEMC-trigger hadron as one of the decay daughters. We also show that the trigger efficiency can be obtained reliably in simulation and data-driven approaches, and final results from new method are compared with previous published results.

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

    SciTech Connect

    Ray Yarema et al.

    2002-09-26

    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.

  17. Performance of the ATLAS Calorimeters and Commissioning for LHC Run-2

    E-print Network

    Rossetti, Valerio; The ATLAS collaboration

    2015-01-01

    The ATLAS general-purpose experiment at the Large Hadron Collider (LHC) is equipped with electromagnetic and hadronic liquid-argon (LAr) calorimeters and a hadronic scintillator-steel sampling calorimeter (TileCal) for measuring energy and direction of final state particles in the pseudorapidity range $|\\eta| The calibration and performance of the calorimetry system was established during beam tests, cosmic ray muon measurements and in particular the first three years of pp collision data-taking. During this period, referred to as Run-1, approximately 27~fb$^{-1}$ of data have been collected at the center-of-mass energies of 7 and 8~TeV. Results on the calorimeter operation, monitoring and data quality, as well as their performance will be presented, including the calibration and stability of the electromagnetic scale, response uniformity and time resolution. These results demonstrate that the LAr and Tile calorimeters perform excellently within their design requirements. The calorimetry system thu...

  18. Avalanche photodiodes and vacuum phototriodes for the electromagnetic calorimeter of the CMS experiment at the Large Hadron Collider

    NASA Astrophysics Data System (ADS)

    Hobson, Peter R.

    2009-06-01

    The homogeneous lead tungstate electromagnetic calorimeter for the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider operates in a challenging radiation environment. The central region of the calorimeter uses large-area avalanche photodiodes to detect the fast blue-violet scintillation light from the crystals. The high hadron fluence in the forward region precludes the use of these photodiodes and vacuum phototriodes are used in this region. The constructional complexity of the calorimeter, which comprises 75848 individual crystals, plus the activation of material make repair during the lifetime of the detector virtually impossible. We describe here the key features and performance of the photodetectors and the quality assurance procedures that were used to ensure that the proportion of photodetectors that fail over the lifetime of CMS will be limited to a fraction of a percent.

  19. Digital part of SiPM Integrated Read-Out Chip ASIC for ILC hadronic calorimeter , M.Bouchel a

    E-print Network

    Paris-Sud XI, Université de

    Digital part of SiPM Integrated Read-Out Chip ASIC for ILC hadronic calorimeter F.Dulucq a , M, measure and read-out). This ASIC was submitted in June 2007 (technology AMS SiGe 0.35µm). In this paper, section I describes the general architecture of the ASIC and the main interactions between analogue

  20. Optimization of energy resolution in the Digital Hadron Calorimeter using longitudinal weights

    NASA Astrophysics Data System (ADS)

    Smith, Jacob Russell

    Particle physics seeks to describe matter in its most elementary structure. With lepton colliders; couplings of gauge bosons and heavy quarks, physics beyond the Standard Model, and properties of a recently discovered Higgs boson can be studied with very high precision. Particle Flow Algorithms (PFA), able to achieve necessary jet-energy and di-jet mass resolutions, require fine transverse and longitudinal segmentation from calorimeters. To validate digital imaging calorimetry in this context, a Digital Hadron Calorimeter (DHCAL) with single-bit (digital) readout on imbedded electronics from 1x1 cm2 pads throughout its volume has been constructed and exposed to particle beams as a large prototype with 54 layers of Resistive Plate Chambers and nearly 500k readout channels. With this data, I report on a sophisticated statistical technique to improve the single particle energy resolution using weights that take advantage of correlations of the energy deposit between layers. Limitations to resolution improvement are identified and possible modifications are discussed. Simulation is used to verify particle identification techniques applied to the data.

  1. Comparison between Geant4, Fluka and the TileCal test-beam data

    NASA Astrophysics Data System (ADS)

    Cascella, M.; Gallas, M.; Pokorski, W.; Ribon, A.; TileCal Collaboration

    2010-05-01

    We present a study of the signal produced by charged pions of energies ranging between 20 and 350 GeV in modules of ATLAS tile calorimeter. The results from test beam data are compared to the predictions of different Monte Carlo simulations (Geant4 and Fluka). The goal is to assess in a quantitative way how well different Monte Carlo codes can reproduce the distribution of visible energy in the calorimeter and the details of the hadronic shower.

  2. Proton and Neutron Irradiation Tests of Readout Electronics of the ATLAS Hadronic Endcap Calorimeter

    E-print Network

    Menke, Sven; The ATLAS collaboration

    2012-01-01

    The readout electronics of the ATLAS Hadronic Endcap Calorimeter will have to withstand the about ten times larger radiation environment of the future high-luminosity LHC (HL-LHC) compared to their design values. The GaAs ASIC which comprises the heart of the readout electronics has been exposed to neutron and proton radiation with fluences up to ten times the total expected fluences for ten years of running of the HL-LHC. Neutron tests where performed at the NPI in Rez, Czech Republic, where a 36 MeV proton beam is directed on a thick heavy water target to produce neutrons. The proton irradiation was done with 200 MeV protons at the PROSCAN area of the Proton Irradiation Facility at the PSI in Villigen, Switzerland. In-situ measurements of S-parameters in both tests allow the evaluation of frequency dependent performance parameters - like gain and input impedance - as a function of the fluence. The linearity of the ASIC response has been measured directly in the neutron tests with a triangular input pulse of...

  3. Proton and Neutron Irradiation Tests of Readout Electronics of the ATLAS Hadronic Endcap Calorimeter

    E-print Network

    Menke, Sven

    2012-01-01

    The readout electronics of the ATLAS Hadronic Endcap Calorimeter will have to withstand the about ten times larger radiation environment of the future high-luminosity LHC (HL-LHC) compared to their design values. The GaAs ASIC which comprises the heart of the readout electronics has been exposed to neutron and proton radiation with fluences up to ten times the total expected fluences for ten years of running of the HL-LHC. Neutron tests were performed at the NPI in Rez, Czech Republic, where a 36 MeV proton beam is directed on a thick heavy water target to produce neutrons. The proton irradiation was done with 200 MeV protons at the PROSCAN area of the Proton Irradiation Facility at the PSI in Villigen, Switzerland. In-situ measurements of S-parameters in both tests allow the evaluation of frequency dependent performance parameters - like gain and input impedance - as a function of the fluence. The linearity of the ASIC response has been measured directly in the neutron tests with a triangular input pulse of ...

  4. Quality Factors in TileCal and out-of-time Pile-up

    E-print Network

    Klimek, Pawel; The ATLAS collaboration

    2011-01-01

    The ATLAS experiment records data from the proton-proton collisions produced by the Large Hadron Collider (LHC). The Tile Calorimeter is the hadronic sampling calorimeter of ATLAS in the region |?| cell (pile-up). In 2011 the LHC is running with filled bunches at 50 ns spacing and with an expected number of up to about 8 proton-proton collisions per bunch crossing. We present a Quality Factor that is computed online for each event and for each calorimeter cell within the L1 trigger latency (10 ?s), and allows to identify calorimeter channels presenting pile-up. In presence of poor quality factor the data from the corresponding channel is read out with additional information to allow for an offline dedicated treatment of the...

  5. Calculated performance of iron-argon and iron-plastic calorimeters for incident hadrons with energies of 5 to 75 GeV

    Microsoft Academic Search

    T. A. Gabriel; W. Schmidt

    1976-01-01

    The calculated responses of iron--argon and iron--plastic calorimeters ; for incident hadrons with energies of 5 to 75 GeV are presented. The responses ; calculated are energy resolution vs energy, energy resolution vs the thickness of ; the sampling plates, the angular and spatial root-mean-square deviations (i.e., ; the ability to determine the incident particle's entrance angle and impact ;

  6. Irradiation Tests and Expected Performance of Readout Electronics of the ATLAS Hadronic Endcap Calorimeter for the HL-LHC

    E-print Network

    Nagel, M; The ATLAS collaboration

    2013-01-01

    The readout electronics of the ATLAS Hadronic Endcap Calorimeter will have to withstand an about 10 times larger radiation environment at the future high-luminosity LHC (HL-LHC) compared to their design values. The GaAs ASIC, which comprises the heart of the readout electronics and consists of a Pre-Amplification and a Summing stage (PAS), has been exposed to neutron and proton radiation with fluences corresponding to ten years of running of the HL-LHC. Neutron tests were performed at the NPI in Rez, Czech Republic, where a 36 MeV proton beam is directed on a thick heavy water target to produce neutrons. The proton irradiation was done with 200 MeV protons at the PROSCAN area of the Proton Irradiation Facility at the PSI in Villigen, Switzerland. In-situ measurements of S-parameters in both tests allow the evaluation of frequency dependent performance parameters, like gain and input impedance, as a function of fluence. The non-linearity of the ASIC response has been measured directly in the neutron tests with...

  7. Irradiation Tests and Expected Performance of Readout Electronics of the ATLAS Hadronic Endcap Calorimeter for the HL-LHC

    E-print Network

    Nagel, M; The ATLAS collaboration

    2013-01-01

    The readout electronics of the ATLAS Hadronic Endcap Calorimeter (HEC) will have to withstand an about 3-5 times larger radiation environment at the future high-luminosity LHC (HLLHC) compared to their design values. The preamplifier and summing boards (PSBs), which are equipped with GaAs ASICs and comprise the heart of the readout electronics, were irradiated with neutrons and protons with fluences surpassing several times ten years of operation of the HL-LHC. Neutron tests were performed at the NPI in Rez, Czech Republic, where a 36 MeV proton beam was directed on a thick heavy water target to produce neutrons. The proton irradiation was done with 200 MeV protons at the PROSCAN area of the Proton Irradiation Facility at the PSI in Villigen, Switzerland. In-situ measurements of S-parameters in both tests allow the evaluation of frequency dependent performance parameters, like gain and input impedance, as a function of fluence. The linearity of the ASIC response was measured directly in the neutron tests with...

  8. Status of the Atlas Calorimeters: their performance during three years of LHC operation and plans for future upgrades.

    E-print Network

    Majewski, S; The ATLAS collaboration

    2014-01-01

    The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider (LHC) at CERN. Its calorimeter system measures the energy and direction of final state particles over the pseudorapidity range $|\\eta| tau leptons, and also contribute to the measurement of the missing transverse energy and the identification of muons. A scintillator-steel sampling calorimeter (TileCal) is employed in the region $|\\eta| < 1.7$, while the region $1.5 < |\\eta| < 3.2$ is covered wi...

  9. SLD liquid argon calorimeter

    SciTech Connect

    Vella, E.

    1992-10-01

    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.

  10. SLD liquid argon calorimeter

    SciTech Connect

    Vella, E.; SLD Collaboration

    1992-10-01

    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.

  11. Reliable and redundant FPGA based read-out design in the ATLAS TileCal Demonstrator

    E-print Network

    Henrik Åkerstedt; Steffen Muschter; Gary Drake; Kelby Anderson; Christian Bohm; Mark Oreglia; Fukun Tang

    2014-06-23

    The Tile Calorimeter at ATLAS is a hadron calorimeter based on steel plates and scintillating tiles read out by PMTs. The current read-out system uses standard ADCs and custom ASICs to digitize and temporarily store the data on the detector. However, only a subset of the data is actually read out to the counting room. The on-detector electronics will be replaced around 2023. To achieve the required reliability the upgraded system will be highly redundant. Here the ASICs will be replaced with Kintex-7 FPGAs from Xilinx. This, in addition to the use of multiple 10 Gbps optical read-out links, will allow a full read-out of all detector data. Due to the higher radiation levels expected when the beam luminosity is increased, opportunities for repairs will be less frequent. The circuitry and firmware must therefore be designed for sufficiently high reliability using redundancy and radiation tolerant components. Within a year, a hybrid demonstrator including the new read-out system will be installed in one slice of the ATLAS Tile Calorimeter. This will allow the proposed upgrade to be thoroughly evaluated well before the planned 2023 deployment in all slices, especially with regard to long term reliability. Different firmware strategies alongside with their integration in the demonstrator are presented in the context of high reliability protection against hardware malfunction and radiation induced errors.

  12. Scintillators with Silicon Photomultiplier Readout for Timing Measurements in Hadronic Showers

    E-print Network

    Soldner, Christian

    2011-01-01

    The advent of silicon photomultipliers has enabled big advances in high energy physics instrumentation, for example by allowing the construction of extremely granular hadronic calorimeters with photon sensors integrated into small scintillator tiles. Direct coupling of the SiPM to the plastic scintillator, without use of wavelength shifting fibers, provides a fast detector response, making such devices well suited for precise timing measurements. We have constructed a setup consisting of 15 such scintillator tiles read out with fast digitizers with deep buffers to measure the time structure of signals in hadronic calorimeters. Specialized data reconstruction algorithms that allow the determination of the arrival time of individual photons by a detailed analysis of the recorded waveforms and that provide automatic calibration of the gain of the photon sensor, have been developed. We will discuss the experimental apparatus and the data analysis. In addition, we will report on first results obtained in a hadroni...

  13. Response and Uniformity Studies of Directly Coupled Tiles

    SciTech Connect

    Zutshi, Vishnu

    2010-04-02

    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.

  14. Hyperbolic Tilings

    NSDL National Science Digital Library

    This image is a hyperbolic tiling made from alternating two shapes: heptagons and triangles. This image is a hyperbolic tiling made from alternating two shapes: heptagons and triangles. This image is a hyperbolic tiling made from alternating two shapes: heptagons and triangles. This image is a hyperbolic tiling made from alternating two shapes: heptagons and triangles. This image is a hyperbolic tiling made from alternating two shapes: heptagons and triangles.

  15. Crystal Calorimeters in the Next Decade

    NASA Astrophysics Data System (ADS)

    Zhu, Ren-Yuan

    Crystal calorimeter has traditionally played an important role in precision measurement of electrons and photons in high energy physics experiments. Recent interest in calorimeter technology extends its application to measurement of hadrons and jets with dual readout. Potential application of new generation scintillating crystals of high density and high light yield, such as cerium doped LSO and LYSO, in high energy physics experiments is described. Candidate crystals for the homogeneous hadronic calorimeter concept are also discussed.

  16. MAC calorimeters and applications

    SciTech Connect

    MAC Collaboration

    1982-03-01

    The MAC detector at PEP features a large solid-angle electromagnetic/hadronic calorimeter system, augmented by magnetic charged-particle tracking, muon analysis and scintillator triggering. Its implementation in the context of electron-positron annihilation physics is described, with emphasis on the utilization of calorimetry.

  17. ALICE electromagnetic calorimeter prototype test

    SciTech Connect

    Awes, Terry; /Oak Ridge

    2005-09-01

    This Memorandum of Understanding between the Test Beam collaborators and Fermilab is for the use of beam time at Fermilab during the Fall, 2005 Meson Test Beam Run. The experimenters plan to measure the energy, position, and time resolution of prototype modules of a large electromagnetic calorimeter proposed to be installed in the ALICE experiment at the LHC. The ALICE experiment is one of the three large approved LHC experiments, with ALICE placing special emphasis on the LHC heavy-ion program. The large electromagnetic calorimeter (EMCal) is a US initiative that is endorsed by the ALICE collaboration and is currently in the early stages of review by the Nuclear Physics Division of the DOE. The installation in the test beam at FNAL and test beam measurements will be carried out by the US members of the ALICE collaboration (ALICE-USA). The overall design of the ALICE EMCal is heavily influenced by its location within the ALICE L3 magnet. The EMCal is to be located inside the large room temperature magnet within a cylindrical integration volume approximately l12cm deep, by 5.6m in length, sandwiched between the ALICE TPC space frame and the L3 magnet coils. The chosen technology is a layered Pb-scintillator sampling calorimeter with a longitudinal pitch of 1.6mm Pb and 1.6mm scintillator. The full detector spans {eta} = -0.7 to {eta} = 0.7 with an azimuthal acceptance of {Delta}{phi} = 120{sup o}. The EMCal readout is of a ''Shish-Kabob'' type similar to the PHENIX Pb-scintillator sampling calorimeter in which the scintillation light is collected via wavelength shifting fibers running through the Pb-scintillator tiles perpendicular to the front surface. The detector is segmented into {approx}14000 towers. The basic structural units of the calorimeter are supermodules, each subtending approximately {approx}20{sup o} in {Delta}{phi} and 0.7 units in {Delta}{eta}. Supermodules are assembled from individual modules. The modules are further segmented into 2 x 2 individually read out towers. The fibers from an individual tower are grouped together to form readout tower bundles. These are each optically coupled to an avalanche photodiode (APO) via a short light guide to provide some spatial optical mixing and to match the fiber bundle to the APO. The module assembly is indicated in Figure l. The supermodules weigh about 9.6 tons and are the basic units handled during installation. Each supermodule is roughly I45cm wide at the front surface by 350cm long with an active depth of 24.5cm (at {eta} = 0) plus an additional 6.6 cm of depth in structural plates. The physical characteristics of the ALICE EMCal are summarized in Table 1. The EMCal test beam measurements at FNAL will utilize a stacked 4 x 4 array of prototype EMCal modules (8 x 8 towers). All towers will be instrumented with the same model APO and preamplifier as will be used in the ALICE experiment and all channels will be readout with existing prototype front end electronics intended for use in ALICE. The goals of the test beam measurements are: To investigate the energy resolution, linearity, uniformity, and position resolution, using electron beams; To study the energy dependence of the response to electrons and hadrons to determine the particle identification capabilities of the EMCal by shower shape; And to investigate the timing characteristics of the energy signal for crude time-of-flight measurement ({approx} 1ns) for use for anti-neutron rejection. Measurements will be made for comparison with different signal shaping times in the front end electronics.

  18. Development of Large Area Gas Electron Multiplier Detector and Its Application to a Digital Hadron Calorimeter for Future Collider Experiments

    SciTech Connect

    Yu, Jaehoon; White, Andrew

    2014-09-25

    The UTA High Energy Physics Group conducted generic detector development based on large area, very thin and high sensitivity gas detector using gas electron multiplier (GEM) technology. This is in preparation for a use as a sensitive medium for sampling calorimeters in future collider experiments at the Energy Frontier as well as part of the tracking detector in Intensity Frontier experiments. We also have been monitoring the long term behavior of one of the prototype detectors (30cmx30cm) read out by the SLAC-developed 13-bit KPiX analog chip over three years and have made presentations of results at various APS meetings. While the important next step was the development of large area (1m x 1m) GEM planes, we also have looked into opportunities of applying this technology to precision tracking detectors to significantly improve the performance of the Range Stack detector for CP violation experiments and to provide an amplification layer for the liquid Argon Time Projection Chamber in the LBNE experiment. We have jointly developed 33cmx100cm large GEM foils with the CERN gas detector development group to construct 33cm x100cm unit chambers. Three of these unit chambers will be put together to form a 1m x 1m detector plane. Following characterization of one 33cmx100cm unit chamber prototype, a total of five 1m x 1m planes will be constructed and inserted into an existing 1m3 RPC DHCAL stack to test the performance of the new GEM DHCAL in particle beams. The large area GEM detector we planned to develop in this proposal not only gives an important option to DHCAL for future collider experiments but also the potential to expand its use to Intensity Frontier and Cosmic Frontier experiments as high efficiency, high amplification anode planes for liquid Argon time projection chambers. Finally, thanks to its sensitivity to X-rays and other neutral radiations and its light-weight characteristics, the large area GEM has a great potential for the use in medical imaging and homeland security, as well as satellite based astronomy experiments.

  19. An FPGA based backup version of the TileCal digitizer

    Microsoft Academic Search

    D. Eriksson; S. Muschter; C. Bohm

    2010-01-01

    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

  20. Tiling Phosphorene

    NASA Astrophysics Data System (ADS)

    Zhu, Zhen; Tomanek, David; Guan, Jie

    2015-03-01

    We introduce a scheme to categorize the structure of different layered phosphorene allotropes by mapping their non-planar atomic structure onto a two-color 2D triangular tiling pattern. In the puckered structure of a phosphorene monolayer, we assign atoms in ``top'' positions to dark tiles and atoms in ``bottom'' positions to light tiles. Optimum sp3 bonding is maintained throughout the structure when each triangular tile is surrounded by the same number N of like-colored tiles, with 0 <= N <= 2 . Our ab initio density functional calculations indicate that both the relative stability and electronic properties depend primarily on the structural index N. The proposed mapping approach may also be applied to phosphorene structures with non-hexagonal rings and 2D quasicrystals with no translational symmetry, which we predict to be nearly as stable as the hexagonal network. Supported by the National Science Foundation Cooperative Agreement #EEC-0832785, titled ``NSEC: Center for High-rate Nanomanufacturing.''

  1. The Detector Control System of the ATLAS experiment at CERN:An application to the calibration of the modules of the Tile Hadron Calorimeter

    Microsoft Academic Search

    F Varelá-Rodriguez; H J Burckhart

    2002-01-01

    The principle subject of this thesis work is the design and development of the Detector Control System (DCS) of the ATLAS experiment at CERN. The DCS must ensure the coherent and safe operation of the detector and handle the communication with external systems, like the LHC accelerator and CERN services. A bidirectional data flow between the Data AcQuisition (DAQ) system

  2. Electromagnetic Calorimeter for Hades Experiment

    NASA Astrophysics Data System (ADS)

    Kugler, A.; Blume, C.; Czyžycki, W.; Epple, E.; Fabbietti, L.; Galatyuk, T.; Golubeva, M.; Guber, F.; Hlavá?, S.; Ivashkin, A.; Kajetanowic, M.; Kardan, B.; Koenig, W.; Lapidus, K.; Lisowski, E.; Pietraszko, J.; Reshetin, A.; Rost, A.; Salabura, P.; Sobolev, Y. G.; Svoboda, O.; Tlusty, P.; Traxler, M.

    2014-06-01

    Electromagnetic calorimeter (ECAL) is being developed to complement the dilepton spectrometer HADES currently operating at GSI Darmstadt, Germany. ECAL will enable the HADES@FAIR experiment to measure data on neutral meson production in heavy ion collisions at the energy range of 2-10 A GeV on the beam of future accelerator SIS100@FAIR. The calorimeter will also improve the electron-hadron separation and will as well be used for the detection of photons from strange resonances in elementary and heavy ion reactions. Calorimeter modules constructed of lead glass Cherenkov counter, photomultiplier, HV divider and optical fiber are described in the detail. Two prototypes of novel front-end electronics based on TRB3 are presented. A dedicated LED based system being developed to monitor the stability of the calorimeter during beamtime is introduced as well.

  3. Tiled microprocessors

    E-print Network

    Taylor, Michael Bedford, 1975-

    2007-01-01

    Current-day microprocessors have reached the point of diminishing returns due to inherent scalability limitations. This thesis examines the tiled microprocessor, a class of microprocessor which is physically scalable but ...

  4. Calibration System with Optical Fibers for Calorimeters at Future Linear Collider Experiments

    E-print Network

    ,

    2012-01-01

    We report on several versions of the calibration and monitoring system dedicated to scintillator tile calorimeters built within the CALICE collaboration and intended for future linear collider experiments. Whereas the first, a 1 m3 analogue hadron calorimeter prototype, was already built and tested in beam, second-technological prototype-is currently being developed. Both prototypes are based on scintillating tiles that are individually read out by new photodetectors, silicon photomultipliers (SiPMs). Since the SiPM response shows a strong dependence on the temperature and bias voltage and the SiPM saturates due to the limited number of pixels, it needs to be monitored. The monitoring system has to have sufficient flexibility to perform several different tasks. The self-calibration property of the SiPMs can be used for the gain monitoring using a low intensity of the LED light. A routine monitoring of all SiPMs during test beam operations is achieved with a fixed-intensity light pulse. The full SiPM response ...

  5. CMS Hadronic Calorimeter Upgrade Studies

    E-print Network

    Akgun, Ugur

    Theory Standard modelSUSY? Gravity Super Nuclear Force Short range QCD ? Super Unification Celestial Gravity Kepler Long range Universal Gravitation Terrestrial Gravity Einstein, Newton Galilei Gravitation #12;Origin of mass and The Higgs mechanism · Simplest theory: all particles are massless !! · A field

  6. Photon calorimeter

    DOEpatents

    Chow, Tze-Show

    1988-04-22

    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.

  7. Photon Calorimeter

    DOEpatents

    Chow, Tze-Show (Hayward, CA)

    1989-01-01

    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.

  8. Performance of the SLD Warm Iron Calorimeter prototype

    SciTech Connect

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

    1986-03-01

    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.

  9. Firmware Development for the ATLAS TileCal sROD

    E-print Network

    Moreno Marti, Pablo; The ATLAS collaboration; Valero, Alberto

    2015-01-01

    TileCal is the central hadronic calorimeter of the ATLAS experiment at the Large Hadron Collider (LHC) at CERN. A main upgrade of the LHC (also called Phase-II) is planned in order to increase the instantaneous luminosity in 2022. At the TileCal level, the upgrade involves the redesign of the complete read-out architecture, affecting both the front-end and the back-end electronics. In the new read-out architecture, the front-end electronics will transmit digitized information of the full detector to the back-end system every single bunch-crossing. Thus, the back-end system must provide digital calibrated information to the first level of trigger. Having all detector data per bunch crossing in the back-end will increase the precision and granularity of the trigger information, improving this way the trigger efficiencies. A reduced part of the detector, 1/256 of the total, will be equipped with the new electronics during 2015 to evaluate the proposed architecture in real conditions in the so-called “demonstra...

  10. Penrose Tiling

    Microsoft Academic Search

    Andrew S. Glassner

    1998-01-01

    In a previous paper I discussed the topic of aperiodic tiling for the plane (Glassner, 1998). This technique helps us create patterns with lots of theme and variation, like the leaves on a tree. I continue discussing the subject. The basic approach is to take a bunch of 2D shapes and impose rules on how they can connect, like the

  11. Electromagnetic Calorimeter for HADES

    E-print Network

    W. Czyzycki; E. Epple; L. Fabbietti; M. Golubeva; F. Guber; A. Ivashkin; M. Kajetanowicz; A. Krasa; F. Krizek; A. Kugler; K. Lapidus; E. Lisowski; J. Pietraszko; A. Reshetin; P. Salabura; Y. Sobolev; J. Stanislav; P. Tlusty; T. Torrieri; M. Traxler

    2011-11-28

    We propose to build the Electromagnetic calorimeter for the HADES di-lepton spectrometer. It will enable to measure the data on neutral meson production from nucleus-nucleus collisions, which are essential for interpretation of dilepton data, but are unknown in the energy range of planned experiments (2-10 GeV per nucleon). The calorimeter will improve the electron-hadron separation, and will be used for detection of photons from strange resonances in elementary and HI reactions. Detailed description of the detector layout, the support structure, the electronic readout and its performance studied via Monte Carlo simulations and series of dedicated test experiments is presented. The device will cover the total area of about 8 m^2 at polar angles between 12 and 45 degrees with almost full azimuthal coverage. The photon and electron energy resolution achieved in test experiments amounts to 5-6%/sqrt(E[GeV]) which is sufficient for the eta meson reconstruction with S/B ratio of 0.4% in Ni+Ni collisions at 8 AGeV. A purity of the identified leptons after the hadron rejection, resulting from simulations based on the test measurements, is better than 80% at momenta above 500 MeV/c, where time-of-flight cannot be used.

  12. Tile Drainage 

    E-print Network

    Leidigh, A.H.; Gee, E.C.

    1916-01-01

    - ment Expert rn Charge CLERICAL J M SCHAEDEL ' Stenographer -DAISY LEE. ~eg:stration Clerk W. F. CHRISTIAN, Stenographer ELIZABETH WALKER Stenographer J. L. CO~INGHAM, Stenographer **SUBSTATION NO. 12: Chillicothe, Harde- man County R. W... the destructive .. ashing to which they are becoming increasingly subject as the length of time they 11aye been in cultivation increases. Vhether or not these soils should be tile-drained depends on local conditions. Terracing and then seeding down to grasses...

  13. A sampling calorimeter with warm-liquid ionization chambers

    NASA Astrophysics Data System (ADS)

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

    2006-10-01

    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 absolute energy calibration of the detectors is discussed. Results of the analysis of the lateral and longitudinal shower development in the calorimeter are presented and compared with results from simulations based on the GEANT/FLUKA code.

  14. PERCOLATION ON PENROSE TILINGS

    Microsoft Academic Search

    A. Hof

    ABSTRACT. In Bernoulli site percolation on Penrose tilings there are two natural definitions of the critical probability. This paper shows that they are equal on almost all Penrose tilings. It also shows that for almost all Penrose tilings the number,of infinite clusters is almost surely 0 or 1. The results generalize to percolation on a large class of aperiodic tilings

  15. Preassembly Of Insulating Tiles

    NASA Technical Reports Server (NTRS)

    Izu, Y. D.; Yoshioka, E. N.; Rosario, T.

    1988-01-01

    Concept for preassembling high-temperature insulating tiles speeds and simplifies installation and repair and reduces damage from handling. Preassembly concept facilitates placement of tiles on gently contoured surfaces as well as on flat ones. Tiles bonded to nylon mesh with room-temperature-vulcanizing silicon rubber. Spacing between tiles is 0.03 in. Applications include boilers, kilns, and furnaces.

  16. The CASTOR calorimeter at the CMS experiment

    E-print Network

    Paolo Gunnellini

    2013-04-10

    The CASTOR Calorimeter at the CMS experiment is an electromagnetic/hadronic calorimeter which covers the very forward region of the detector (-6.6 CASTOR is a Cherenkov sampling calorimeter, consisting of quartz and tungsten plates, with an overall depth of 10 interaction lengths, able to detect penetrating cascade particles. It is segmented in 16 transversal and 14 longitudinal sections. Surrounding the beam pipe, its design is determined by space constraints and restricted to materials which tolerate a high radiation level. In this presentation we report on the operational experience and measurements with the CASTOR calorimeter during the 2010 data taking at the LHC, with proton-proton and heavy ion collisions. An overview of the broad physics program which can be accessed with CASTOR, as well as the status of published and ongoing physics analyses and detector studies are presented.

  17. Precision calibration of the NuTeV calorimeter

    NASA Astrophysics Data System (ADS)

    Harris, D. A.; Yu, J.; Adams, T.; Alton, A.; Avvakumov, S.; de Barbaro, L.; de Barbaro, P.; Bernstein, R. H.; Bodek, A.; Bolton, T.; Brau, J.; Buchholz, D.; Budd, H.; Bugel, L.; Conrad, J.; Drucker, R. B.; Fleming, B. T.; Frey, R.; Formaggio, J.; Goldman, J.; Goncharov, M.; Johnson, R. A.; Kim, J. H.; Koutsoliotas, S.; Krishnaswami, G.; Lamm, M. J.; Marsh, W.; Mason, D.; McNulty, C.; McFarland, K. S.; Naples, D.; Nienaber, P.; Romosan, A.; Sakumoto, W. K.; Schellman, H.; Shaevitz, M. H.; Spentzouris, P.; Stern, E. G.; Vaitaitis, A.; Vakili, M.; Van Ark, E.; Wu, V.; Yang, U. K.; Zeller, G. P.; NuTeV Collaboration

    2000-06-01

    NuTeV is a neutrino-nucleon deep-inelastic scattering experiment at Fermilab. The detector consists of an iron-scintillator sampling calorimeter interspersed with drift chambers, followed by a muon toroidal spectrometer. We present determinations of response and resolution functions of the NuTeV calorimeter for electrons, hadrons, and muons over an energy range from 4.8 to 190 GeV. The absolute hadronic energy scale is determined to an accuracy of 0.43%. We compare our measurements to predictions from calorimeter theory and GEANT3 simulations.

  18. The ATLAS Liquid Argon Electromagnetic Calorimeter 1

    E-print Network

    Boyer, Edmond

    Hadronic LAr End Cap FIGURE 1. Schematic view of the ATLAS calorimeter system. TEST BEAM RESULTS This EM to the control room if accepted by the trigger. The electronics chain has been calibrated continually for each. The Fig. 2 shows these modules before insertion in the cryostat. For data analysis, a cluster (typically 3

  19. Development of a forward calorimeter system for the STAR experiment

    NASA Astrophysics Data System (ADS)

    Tsai, O. D.; Aschenauer, E.; Christie, W.; Dunkelberger, L. E.; Fazio, S.; Gagliardi, C. A.; Heppelmann, S.; Huang, H. Z.; Jacobs, W. W.; Igo, G.; Kisilev, A.; Landry, K.; Liu, X.; Mondal, M. M.; Pan, Y. X.; Sergeeva, M.; Shah, N.; Sichtermann, E.; Trentalange, S.; Visser, G.; Wissink, S.

    2015-02-01

    We present results of an R&D program to develop a forward calorimeter system (FCS) for the STAR experiment at the Relativistic Heavy Ion Collider at BNL. The FCS is a very compact, compensated, finely granulated, high resolution calorimeter system being developed for p+p and p+A program at RHIC. The FCS prototype consists of both electromagnetic and hadron calorimeters. The electromagnetic portion of the detector is constructed with W powder and scintillation fibers. The hadronic calorimeter is a traditional Pb/Sc-plate sandwich design. Both calorimeters were readout with Hamamatsu MPPCs. A full- scale prototype of the FCS was tested with a beam at FNAL in March 2014. We present details of the design, construction technique and performance of the FCS prototype during the test run at FNAL.

  20. Symmetry and Tilings: An Exploration

    NSDL National Science Digital Library

    James Rutledge

    Students are directed to read through a Web-based tutorial on Symmetry and Tilings in the form of an short and colorful article entitled Tilings and Tesselations; afterwards, they answer several questions on tilings (tessellations), tiling terminology, types of symmetry (isometries), periodic tilings and Penrose tilings.

  1. Handmade Tile Mosaics

    ERIC Educational Resources Information Center

    Keeler, Rusty

    2007-01-01

    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…

  2. The Convenience of Tilings

    Microsoft Academic Search

    Peter Van Emde Boas

    1997-01-01

    Tiling problems provide for a very simple and transparent mechanism for encodingmachine computations. This gives rise to rather simple master reductions showingvarious versions of the tiling problem complete for various complexity classes. We investigatethe potential for using these tiling problems in subsequent reductions showinghardness of the combinatorial problems that really matter.We ilustrate our approach by means of three examples: a

  3. Mitigation of calorimeter noise.

    SciTech Connect

    Santi, P. A. (Peter A.); Bracken, D. S. (David S.); Smith, M. K. (Morag K.)

    2004-01-01

    One of the main factors that limit the sensitivity of calorimeters is the noise in the calorimeter response. A previous study into the sources of noise in a Wheatstone bridge calorimeter used by Department of Energy (DOE) facilities has shown that the control system for maintaining the water bath at a constant temperature was an important contributor to the noise in the system. In order to minimize the contribution that the control system makes to the noise in the calorimeter response, a new control system for the calorimeter has been developed. An experimental and analytical study has been performed to determine the effectiveness of this new control system in reducing the response noise in a Wheatstone bridge calorimeter. The results of this study are presented along with their implications for future work in minimizing the equilibrium noise of calorimeters.

  4. Imaging Calorimeter: What Have We Learned So Far

    NASA Astrophysics Data System (ADS)

    Xia, Lei

    Particle Flow Algorithms (PFAs) have been applied to existing detectors to improve the measurement of hadronic jets in colliding beam experiments. For future experiments, such as a TeV lepton collider, detector concepts optimized for the application of PFAs are being developed. These concepts require so-called imaging calorimeters, with unprecedented granularity. We will review the various recent developments of such highly granular calorimeters.

  5. First Years of Running for the LHCb Calorimeter System

    E-print Network

    Pascal Perret; for the LHCb Collaboration

    2014-07-16

    The calorimeter system of LHCb is subdivided into four sub-detectors which ensure its longitudinal segmentation: a Scintillator Pad Detector (SPD) followed by a Preshower (PS) and then an electromagnetic (ECAL) an hadronic (HCAL) calorimeter. After a description of these detectors, procedures developed to calibrate their response are discussed together with the degradation of response observed due to the harsh conditions (hard radiation and high current). First results on the calorimeter performance over the two most productive years of physics data taking, 2011 and 2012 are given.

  6. 48. East tile gauge on south pier. Each square tile ...

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

    48. East tile gauge on south pier. Each square tile is 4' in size. Lower section of tile cross only - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

  7. 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

  8. 39. West tile gauge on south pier. Each square tile ...

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

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

  9. 41. West tile gauge on south pier. Each square tile ...

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

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

  10. Toward Meaningful Simulations of Hadronic Showers

    Microsoft Academic Search

    Richard Wigmans

    2007-01-01

    The physics processes that are crucial for the description of hadronic shower development in calorimeters are pi0 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

  11. Properties of a Sampling Calorimeter with Warm-Liquid Ionization Chambers

    NASA Astrophysics Data System (ADS)

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

    2005-02-01

    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.

  12. Upgrade of the ATLAS Calorimeters for Higher LHC Luminosities

    E-print Network

    ATLAS Tile Collaboration; The ATLAS collaboration

    2015-01-01

    The upgrade of the LHC will bring instantaneous and total luminosities which are a factor 5-7 beyond the original design of the ATLAS Liquid Argon (LAr) and Tile Calorimeters and their read-out systems. Due to radiation requirements and a new two-level hardware trigger concept the read-out electronics will be improved in two phases. In Phase-I, a dedicated read-out of the LAr Calorimeters will provide higher granularity input to the trigger, in order to mitigate pile-up effects and to reduce the background rates. In Phase-II, completely new read-out electronics will allow a digital processing of all LAr and Tile Calorimeter channels at full 40 MHz bunch-crossing frequency and a transfer of calibrated energy inputs to the trigger. Results from system design and performance of the developed read-out components, including fully functioning demonstrator systems already operated on the detector, will be reported. Furthermore, the current Forward Calorimeter (FCal) may suffer from signal degradation and argon bubbl...

  13. The TileCal Online Energy Estimation for the Next LHC Operation Period

    NASA Astrophysics Data System (ADS)

    Sotto-Maior Peralva, B.; ATLAS Collaboration

    2015-05-01

    The ATLAS Tile Calorimeter (TileCal) is the detector used in the reconstruction of hadrons, jets and missing transverse energy from the proton-proton collisions at the Large Hadron Collider (LHC). It covers the central part of the ATLAS detector (|?| < 1.6). The energy deposited by the particles is read out by approximately 5,000 cells, with double readout channels. The signal provided by the readout electronics for each channel is digitized at 40 MHz and its amplitude is estimated by an optimal filtering algorithm, which expects a single signal with a well-defined shape. However, the LHC luminosity is expected to increase leading to pile-up that deforms the signal of interest. Due to limited resources, the current hardware setup, which is based on Digital Signal Processors (DSP), does not allow the implementation of sophisticated energy estimation methods that deal with the pile-up. Therefore, the technique to be employed for online energy estimation in TileCal for next LHC operation period must be based on fast filters such as the Optimal Filter (OF) and the Matched Filter (MF). Both the OF and MF methods envisage the use of the background second order statistics in its design, more precisely the covariance matrix. However, the identity matrix has been used to describe this quantity. Although this approximation can be valid for low luminosity LHC, it leads to biased estimators under pile- up conditions. Since most of the TileCal cell present low occupancy, the pile-up, which is often modeled by a non-Gaussian distribution, can be seen as outlier events. Consequently, the classical covariance matrix estimation does not describe correctly the second order statistics of the background for the majority of the events, as this approach is very sensitive to outliers. As a result, the OF (or MF) coefficients are miscalculated leading to a larger variance and biased energy estimator. This work evaluates the usage of a robust covariance estimator, namely the Minimum Covariance Determinant (MCD) algorithm, to be applied in the OF design. The goal of the MCD estimator is to find a number of observations whose classical covariance matrix has the lowest determinant. Hence, this procedure avoids taking into account low likelihood events to describe the background. It is worth mentioning that the background covariance matrix as well as the OF coefficients for each TileCal channel are computed offline and stored for both online and offline use. In order to evaluate the impact of the MCD estimator on the performance of the OF, simulated data sets were used. Different average numbers of interactions per bunch crossing and bunch spacings were tested. The results show that the estimation of the background covariance matrix through MCD improves significantly the final energy resolution with respect to the identity matrix which is currently used. Particularly, for high occupancy cells, the final energy resolution is improved by more than 20%. Moreover, the use of the classical covariance matrix degrades the energy resolution for the majority of TileCal cells.

  14. Tile densification with TEOS

    NASA Technical Reports Server (NTRS)

    Ecord, G. M.; Schomburg, C.

    1981-01-01

    Densification process uses brushed or sprayed coating of tetraethyl orthosilicate. Liquid is applied and cured in three steps; tile weight increase averages 0.15 g per square centimeter. TEOS liquid is prepared by mixing TEOS with hydrochloric acid and adding marking dye. TEOS application provides variable stiffness, strength, and penetration. Surface of tile shows no buidup and is more durable for additional coatings.

  15. A fractal version of the pinwheel tiling

    E-print Network

    Natalie Priebe Frank; Michael F. Whittaker

    2011-01-25

    We introduce a fractal version of the pinwheel substitution tiling. There are thirteen basic prototiles, all of which have fractal boundaries. These tiles, along with their reflections and rotations, create a tiling space which is mutually locally derivable from the pinwheel tiling space. Interesting rotational properties, symmetries, and relative tile frequency are discussed for the tiling space associated with the fractal pinwheel tiling.

  16. Binary Non-tiles

    E-print Network

    Coppersmith, Don

    2009-01-01

    A subset V of GF(2)^n is a tile if GF(2)^n can be covered by disjoint translates of V. In other words, V is a tile if and only if there is a subset A of GF(2)^n such that V+A = GF(2)^n uniquely (i.e., v + a = v' + a' implies that v=v' and a=a' where v,v' in V and a,a' in A). In some problems in coding theory and hashing we are given a putative tile V, and wish to know whether or not it is a tile. In this paper we give two computational criteria for certifying that V is not a tile. The first involves impossibility of a bin-packing problem, and the second involves infeasibility of a linear program. We apply both criteria to a list of putative tiles given by Gordon, Miller, and Ostapenko in that none of them are, in fact, tiles.

  17. The AMS-02 lead-scintillating fibres Electromagnetic Calorimeter

    NASA Astrophysics Data System (ADS)

    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

    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.

  18. The lead-glass electromagnetic calorimeter for the SELEX experiment

    SciTech Connect

    M. Y. Balatz et al.

    2004-07-19

    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.

  19. "Densified" tiles form stronger bonds

    NASA Technical Reports Server (NTRS)

    Dotts, R. L.; Holt, J. W.

    1981-01-01

    Application of colloidal silica more than doubles bond strength of ceramic tile/substrate attachments. "Densification" process strengthens surface where tile attaches to felt strain-isolator pad, redistributing stresses and preventing failures at that point. First, isopropyl alcohol is applied to bottom tile surface. Second, aqueous mixture of cementing colloidal silica and reinforcing ball-milled silica particles is painted on tile. Finally, after drying, tile is rewaterproofed by exposure to vapors or methyltrimethoxysilane and acetic acid.

  20. Tiled texture synthesis 

    E-print Network

    Green, Lori Anne

    2004-09-30

    In this thesis a new image-based texturing method has been developed. This new method allows users to synthesize tiled textures that can be mapped to any quadrilateral mesh without discontinuity or singularity. An interface ...

  1. Repairing Thermal Tiles

    NASA Technical Reports Server (NTRS)

    Mccain, C. R., Jr.; Feiler, C. W.

    1984-01-01

    Small chips and depression in surfaces of surface insulation tiles repaired using Ludox colloidal silica solution and silica powder. No waiting time necessary between mixing filler and using it. Patch cures quickly without heat being applied.

  2. Tiled Multicore Processors

    NASA Astrophysics Data System (ADS)

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

    For the last few decades Moore’s Law has continually provided exponential growth in the number of transistors on a single 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 multicore architectures combine each processor core with a switch to create a modular element called a tile. Tiles are replicated on a chip as needed to create multicores with any number of tiles. The Raw processor, a pioneering example of a tiled multicore processor, is examined in detail to explain the philosophy, design, and strengths of such architectures. Raw addresses the challenge of building a general-purpose architecture that performs well on a larger class of stream and embedded computing applications than existing microprocessors, while still running existing ILP-based sequential programs with reasonable performance. Central to achieving this goal is Raw’s ability to exploit all forms of parallelism, including ILP, DLP, TLP, and Stream parallelism. Raw approaches this challenge by implementing plenty of on-chip resources - including logic, wires, and pins - in a tiled arrangement, and exposing them through a new ISA, so that the software can take advantage of these resources for parallel applications. Compared to a traditional superscalar processor, Raw performs within a factor of 2x for sequential applications with a very low degree of ILP, about 2x-9x better for higher levels of ILP, and 10x-100x better when highly parallel applications are coded in a stream language or optimized by hand.

  3. 9. Detail of "BMT lines" tile sign, and decorative tiles ...

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

    9. Detail of "BMT lines" tile sign, and decorative tiles between center and east castellations of south facade. Looking north. - Stillwell Avenue Station, Intersection of Stillwell & Surf Avenues, Brooklyn, Kings County, NY

  4. 51. East tile gauge on south pier. Each square tile ...

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

    51. East tile gauge on south pier. Each square tile is 4' in size. Lower end of cross second from bottom - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

  5. 46. East tile gauge on south pier. Each square tile ...

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

    46. East tile gauge on south pier. Each square tile is 4' in size. Lower right section of 4' square eagle section - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

  6. 43. East tile gauge on south pier. Each square tile ...

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

    43. East tile gauge on south pier. Each square tile is 4' in size. Eagle itself in 4' square eagle section - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

  7. 44. East tile gauge on south pier. Each square tile ...

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

    44. East tile gauge on south pier. Each square tile is 4' in size. Top left section of 4' square eagle section - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

  8. 47. East tile gauge on south pier. Each square tile ...

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

    47. East tile gauge on south pier. Each square tile is 4' in size. Middle right section of 4' square eagle section - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

  9. 45. East tile gauge on south pier. Each square tile ...

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

    45. East tile gauge on south pier. Each square tile is 4' in size. Lower left section of 4' square eagel section - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

  10. Magnetically Coupled Calorimeters

    NASA Technical Reports Server (NTRS)

    Bandler, Simon

    2011-01-01

    Calorimeters that utilize the temperature sensitivity of magnetism have been under development for over 20 years. They have targeted a variety of different applications that require very high resolution spectroscopy. I will describe the properties of this sensor technology that distinguish it from other low temperature detectors and emphasize the types of application to which they appear best suited. I will review what has been learned so far about the best materials, geometries, and read-out amplifiers and our understanding of the measured performance and theoretical limits. I will introduce some of the applications where magnetic calorimeters are being used and also where they are in development for future experiments. So far, most magnetic calorimeter research has concentrated on the use of paramagnets to provide temperature sensitivity; recent studies have also focused on magnetically coupled calorimeters that utilize the diamagnetic response of superconductors. I will present some of the highlights of this research, and contrast the properties of the two magnetically coupled calorimeter types.

  11. Scintillating fiber ribbon - tungsten calorimeter

    NASA Astrophysics Data System (ADS)

    Bross, A.; Crisler, M.; Kross, B.; Wrbanek, J.

    1989-07-01

    An ultra-high density scintillating fiber and tungsten calorimeter used as an active beam-dump for electrons are described. Data showing the calorimeter response to electrons with momenta between 50 and 350 GeV/c are presented.

  12. Two-colour Penrose tiling

    Microsoft Academic Search

    X. Z. Li; J. M. Dusois; K. H. Kuo

    1994-01-01

    Penrose tiling is a two-dimensional quasiperiodic pattern, which is composed of two tiles, namely thick and thin rhombi. In this letter, white and black colours are given to the tiles to distinguish their top and bottom surfaces. Then, a two-colour Penrose tiling is yielded by the white black rhombi. The new pattern is a three-dimensional array and its projection is

  13. Texture mapping using tiled textures

    E-print Network

    Kaur, Avneet

    2004-09-30

    in the resultant texturing. The method involves organizing a set of square texture tiles that satisfy specific boundary conditions into one texture image file which is called a tiled texture. Based on the tiled textures, we have developed an extremely simple...

  14. Homogenization of Penrose tilings

    Microsoft Academic Search

    Andrea Braides; Giuseppe Riey; Margherita Solci

    2009-01-01

    A homogenization theorem is proved for energies which follow the geometry of an a-periodic Penrose tiling. The result is obtained by proving that the corresponding energy densities are W1-almost periodic and hence also Besicovitch almost periodic, so that existing general homogenization theorems can be applied (Braides, 1986). The method applies to general quasicrystalline geometries. To cite this article: A. Braides

  15. Seamless tiled projection display

    Microsoft Academic Search

    Nicole Bordes; S. Wickham; William P. Bleha; Bernard Pailthorpe

    2002-01-01

    Users needs for more pixels in displays are starting to be met as manufacturers increase the native resolution of projector chips. Tiling several projectors still offers a solution to augment the pixel capacity of a display. However problems of color and illumination uniformity across projectors need to be addressed as well as the computer software required to drive such devices.

  16. An Inexpensive Solution Calorimeter

    ERIC Educational Resources Information Center

    Kavanagh, Emma; Mindel, Sam; Robertson, Giles; Hughes, D. E. Peter

    2008-01-01

    We describe the construction of a simple solution calorimeter, using a miniature bead thermistor as a temperature-sensing element. This has a response time of a few seconds and made it possible to carry out a thermometric reaction in under a minute, which led to minimal heat losses. Small temperature changes of 1 K associated with enthalpies of…

  17. Status of the Atlas Calorimeters: their performance after two years of LHC operation and plans for future upgrades

    E-print Network

    Solans, CA; The ATLAS collaboration

    2012-01-01

    The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider (LHC) at CERN. Its calorimeter system measures the energy and direction of final state particles with pseudo rapidity $|eta| tau leptons, and also contribute to the measurement of the missing transverse energy and identification of muons. This is done in the region $|eta| < 1.7$ with a scintillator-steel sampling calorimeter, and in the region $1.4 < |eta| < 3.2$ with a copper-LAr sampling calorimeter. The coverage is extended to $|eta| < 4.9$ by an integrated forward calorimeter (FCal...

  18. Status of the Atlas Calorimeters: their performance after two years of LHC operation and plans for future upgrades.

    E-print Network

    Solans, C; The ATLAS collaboration

    2012-01-01

    The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider (LHC) at CERN. Its calorimeter system measures the energy and direction of final state particles with pseudo rapidity $|eta| tau leptons, and also contribute to the measurement of the missing transverse energy and identification of muons. This is done in the region $|eta| < 1.7$ with a scintillator-steel sampling calorimeter, and in the region $1.4 < |eta| < 3.2$ with a copper-LAr sampling calorimeter. The coverage is extended to $|eta| < 4.9$ by an integrated forward calorimeter (FCal) based on LAr with copp...

  19. The Development of a General Purpose ARM-based Processing Unit for the ATLAS TileCal sROD

    E-print Network

    Cox, Mitchell Arij; The ATLAS collaboration; Mellado Garcia, Bruce Rafael

    2014-01-01

    The Large Hadron Collider at CERN generates enormous amounts of raw data which present a serious computing challenge. After Phase-II upgrades in 2022, the data output from the ATLAS Tile Calorimeter will increase by 200 times to 41 Tb/s! ARM processors are common in mobile devices due to their low cost, low energy consumption and high performance. It is proposed that a cost-effective, high data throughput Processing Unit (PU) can be developed by using several consumer ARM processors in a cluster configuration to allow aggregated processing performance and data throughput while maintaining minimal software design difficulty for the end-user. This PU could be used for a variety of high-level functions on the high-throughput raw data such as spectral analysis and histograms to detect possible issues in the detector at a low level. High-throughput I/O interfaces are not typical in consumer ARM System on Chips but high data throughput capabilities are feasible via the novel use of PCI-Express as the I/O interface ...

  20. Parameterized Tiling Revisited Muthu Manikandan Baskaran1

    E-print Network

    Xuan, Dong

    Tile [10, 21], and Pluto [2, 20]. TLOG was the first system to generate parametrically tiled code (where-level tiling. Pluto is a source-to-source au- tomatic parallelization system that performs tiling. Pluto is more general than HITLOG in that imperfectly nested affine loops can be tiled. Also, Pluto can generate

  1. Status of the Liquid Xenon calorimeter of the CMD-3 detector

    NASA Astrophysics Data System (ADS)

    Anisenkov, A. V.; Aulchenko, V. M.; Barkov, L. M.; Bashtovoy, N. S.; Epshteyn, L. B.; Grebenuk, A. A.; Ignatov, F. V.; Karpov, S. V.; Khazin, B. I.; Kozyrev, A. N.; Logashenko, I. B.; Mikhailov, K. Yu; Pestov, Yu N.; Popov, A. S.; Ruban, A. A.; Shebalin, V. E.; Titov, V. M.; Talyshev, A. A.; Yudin, Yu V.

    2014-08-01

    Since 2010 the CMD-3 detector has been collecting data at the e+e- collider VEPP-2000 at Budker Institute of Nuclear Physics. CMD-3 is a general purpose detector designed to study e+e- annihilation into hadrons in the wide energy range ?s = 0.3-2GeV. The barrel electromagnetic calorimeter of the detector has a thickness equal to 13.5X0 and consists of two subsystems: closest to the beam pipe is the Liquid Xenon calorimeter (LXe) and the outer one is based on CsI scintillation crystals (CsI). The design of the LXe calorimeter and its current performance are presented.

  2. Study of the interactions of pions in the CALICE silicon-tungsten calorimeter prototype

    NASA Astrophysics Data System (ADS)

    Adloff, C.; Karyotakis, Y.; Repond, J.; Yu, J.; Eigen, G.; Mikami, Y.; Watson, N. K.; Wilson, J. A.; Goto, T.; Mavromanolakis, G.; Thomson, M. A.; Ward, D. R.; Yan, W.; Benchekroun, D.; Hoummada, A.; Khoulaki, Y.; Apostolakis, J.; Ribon, A.; Uzhinskiy, V.; Benyamna, M.; Cârloganu, C.; Fehr, F.; Gay, P.; Blazey, G. C.; Chakraborty, D.; Dyshkant, A.; Francis, K.; Hedin, D.; Lima, J. G.; Zutshi, V.; Hostachy, J.-Y.; Krastev, K.; Morin, L.; D'Ascenzo, N.; Cornett, U.; David, D.; Fabbri, R.; Falley, G.; Gadow, K.; Garutti, E.; Göttlicher, P.; Jung, T.; Karstensen, S.; Lucaci-Timoce, A.-I.; Lutz, B.; Meyer, N.; Morgunov, V.; Reinecke, M.; Sefkow, F.; Smirnov, P.; Vargas-Trevino, A.; Wattimena, N.; Wendt, O.; Feege, N.; Groll, M.; Haller, J.; Heuer, R.-D.; Morozov, S.; Richter, S.; Samson, J.; Kaplan, A.; Schultz-Coulon, H.-Ch; Shen, W.; Tadday, A.; Bilki, B.; Norbeck, E.; Onel, Y.; Kim, E. J.; Kim, G.; Kim, D.-W.; Lee, K.; Lee, S. C.; Kawagoe, K.; Tamura, Y.; Dauncey, P. D.; Magnan, A.-M.; Yilmaz, H.; Zorba, O.; Bartsch, V.; Postranecky, M.; Warren, M.; Wing, M.; Green, M. G.; Salvatore, F.; Bedjidian, M.; Kieffer, R.; Laktineh, I.; Fouz, M.-C.; Bailey, D. S.; Barlow, R. J.; Kelly, M.; Thompson, R. J.; Danilov, M.; Tarkovsky, E.; Baranova, N.; Karmanov, D.; Korolev, M.; Merkin, M.; Voronin, A.; Frey, A.; Lu, S.; Seidel, K.; Simon, F.; Soldner, C.; Weuste, L.; Bonis, J.; Bouquet, B.; Callier, S.; Cornebise, P.; Doublet, Ph; Faucci Giannelli, M.; Fleury, J.; Li, H.; Martin-Chassard, G.; Richard, F.; de la Taille, Ch; Poeschl, R.; Raux, L.; Seguin-Moreau, N.; Wicek, F.; Anduze, M.; Boudry, V.; Brient, J.-C.; Gaycken, G.; Jeans, D.; Mora de Freitas, P.; Musat, G.; Reinhard, M.; Rougé, A.; Ruan, M.; Vanel, J.-Ch; Videau, H.; Park, K.-H.; Zacek, J.; Cvach, J.; Gallus, P.; Havranek, M.; Janata, M.; Marcisovsky, M.; Polak, I.; Popule, J.; Tomasek, L.; Tomasek, M.; Ruzicka, P.; Sicho, P.; Smolik, J.; Vrba, V.; Zalesak, J.; Belhorma, B.; Belmir, M.; Nam, S. W.; Park, I. H.; Yang, J.; Chai, J.-S.; Kim, J.-T.; Kim, G.-B.; Kang, J.; Kwon, Y.-J.; CALICE Collaboration

    2010-05-01

    A prototype silicon-tungsten electromagnetic calorimeter for an ILC detector was tested in 2007 at the CERN SPS test beam. Data were collected with electron and hadron beams in the energy range 8 to 80 GeV. The analysis described here focuses on the interactions of pions in the calorimeter. One of the main objectives of the CALICE program is to validate the Monte Carlo tools available for the design of a full-sized detector. The interactions of pions in the Si-W calorimeter are therefore confronted with the predictions of various physical models implemented in the GEANT4 simulation framework.

  3. Robinson's aperiodic tile set Robinson's aperiodic tile set consists of crosses

    E-print Network

    Kari, Jarkko

    Robinson's aperiodic tile set Robinson's aperiodic tile set consists of crosses and arms The arrows indicate the matching rules: arrows must continue uninterrupted across tile boundaries. #12;Robinson's aperiodic tile set Robinson's aperiodic tile set consists of crosses and arms All tiles may be rotated so

  4. Physics Potential of the CMS CASTOR Forward Calorimeter

    E-print Network

    Dmytro Volyanskyy; for the CMS Collaboration

    2010-11-22

    The CASTOR calorimeter is a detector covering the very forward region of the CMS experiment at the LHC. It surrounds the beam pipe with 14 longitudinal modules each of which consisting of 16 azimuthal sectors and allows to reconstruct shower profiles, separate electrons and photons from hadrons and search for phenomena with anomalous hadronic energy depositions. The physics program that can be performed with this detector includes a large variety of different QCD topics. In particular, the calorimeter is supposed to contribute to studies of low-x parton dynamics, diffractive scattering, multi-parton interactions and cosmic ray related physics in proton-proton and heavy-ion collisions. The physics capabilities of this detector are briefly summarized in this paper.

  5. Laser tile machining process

    Microsoft Academic Search

    Lisa Bird

    1991-01-01

    A three-dimensional laser machining process is being developed to cut replacement tiles for the Space Shuttle. The process involves a carbon dioxide laser and a computer-controlled five-axis positioner. To date, successful straight-through cuts, curved-through cuts, and partial cuts have been made by the laser. Felt reusable surface insulation, another component of the Shuttle's thermal protection system, has also been successfully

  6. Deformed Penrose tilings

    Microsoft Academic Search

    T. R. Welberry; B. Sing

    2007-01-01

    Monte Carlo (MC) simulation of a model quasicrystal (2D Penrose rhomb tiling) shows that the kinds of local distortions that result from size-effect-like relaxations are in fact very similar to mathematical constructions called deformed model sets. Of particular interest is the fact that these deformed model sets are pure point-diffractive, i.e. they give diffraction patterns that have sharp Bragg peaks

  7. Modeling Complex Calorimeters

    NASA Technical Reports Server (NTRS)

    Figueroa-Feliciano, Enectali

    2004-01-01

    We have developed a software suite that models complex calorimeters in the time and frequency domain. These models can reproduce all measurements that we currently do in a lab setting, like IV curves, impedance measurements, noise measurements, and pulse generation. Since all these measurements are modeled from one set of parameters, we can fully describe a detector and characterize its behavior. This leads to a model than can be used effectively for engineering and design of detectors for particular applications.

  8. DSWA calorimeter bomb experiments

    SciTech Connect

    Cunningham, B

    1998-10-01

    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.

  9. Covering the Plane with Rep-Tiles.

    ERIC Educational Resources Information Center

    Fosnaugh, Linda S.; Harrell, Marvin E.

    1996-01-01

    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)

  10. Ceramic tile expansion engine housing

    DOEpatents

    Myers, Blake (4650 Almond Cir., Livermore, CA 94550)

    1995-01-01

    An expandable ceramic tile housing for a high temperature engine is disclosed wherein each tile is independently supported in place in an interlocking matrix by retention mechanisms which mechanically couple the individual ceramic tiles to an outer metal support housing while maintaining thermal isolation of the metal housing from the ceramic tiles. The ceramic tiles are formed with either an octagonal front face portion and a square shank portion or a square front face portion with an octagonal shank portion. The length of the sides of the octagonal front face portion on one tile is equal to the length of the sides of the square front face portion of adjoining tiles to permit formation of an interlocking matrix. Fibrous ceramic sealing material may be placed between radial and tangential facing surfaces of adjacent tiles to limit radial gas flow therebetween. Labyrinth-sealed pressure-controlled compartments may be established between the tile housing and the outer metal support housing to control radial gas flow.

  11. Ceramic tile expansion engine housing

    DOEpatents

    Myers, B.

    1995-04-11

    An expandable ceramic tile housing for a high temperature engine is disclosed wherein each tile is independently supported in place in an interlocking matrix by retention mechanisms which mechanically couple the individual ceramic tiles to an outer metal support housing while maintaining thermal isolation of the metal housing from the ceramic tiles. The ceramic tiles are formed with either an octagonal front face portion and a square shank portion or a square front face portion with an octagonal shank portion. The length of the sides of the octagonal front face portion on one tile is equal to the length of the sides of the square front face portion of adjoining tiles to permit formation of an interlocking matrix. Fibrous ceramic sealing material may be placed between radial and tangential facing surfaces of adjacent tiles to limit radial gas flow there between. Labyrinth-sealed pressure-controlled compartments may be established between the tile housing and the outer metal support housing to control radial gas flow. 8 figures.

  12. Hadronic final states in high-pT QCD at CDF Keith Matera, on behalf of the CDF collaboration

    E-print Network

    Heller, Barbara

    Hadronic final states in high-pT QCD at CDF Keith Matera, on behalf of the CDF collaboration quark Q (b and c) pro- duction in hadronic collisions provides valuable information about the na- ture, while hadronic calorimeters and muon chambers allow the identification of neu- tral hadrons and muons

  13. Why a homogeneous dual readout calorimeter won't work

    NASA Astrophysics Data System (ADS)

    Groom, Don

    2012-12-01

    If the response to a hadronic shower in a semi-infinite uniform calorimeter structure is S relative to the electronic response, then S/E = [fem + (1 - fem)(h/e)], where E is the incident hadron energy, fem is the electronic shower fraction, and h/e is the hadron/electron response ratio. In conventional calorimeters the resolution is dominated by the stochastic variable fem, whose broad, skewed pdf has an energy-dependent mean. The slow increase of the mean with E is responsible for response nonlinearity and the skewness results in a non-Gaussian response. If the cascade is observed in two channels with different values of h/e (typically scintillator(S) and Cherenkov (C)), fem can be eliminated. An energy estimator, linear in C and S, is obtained which is proportional to the incident hadron's energy. The resolution depends upon the contrast in h/e between the two channels. The Cherenkov h/e will be 0.20-0.25. In sampling calorimeters, h/e can be increased to about 0.7 by arranging for preferential absorption of the electromagnetic (EM) shower energy in the absorber (decreasing e) and using a hydrogenous detector (organic scintillator) to enhance h through the contribution of recoil protons in n-p scattering. Neither mechanism is available in a homogeneous crystal or glass scintillator, where h/e is expected to be in the vicinity of 0.4 because of invisible hadronic energy loss and other effects. The h/e contrast is very likely too small to provide the needed energy resolution. We support this conclusion with simple Monte Carlo simulations.

  14. Kinetics of DNA Tile Dimerization

    PubMed Central

    2015-01-01

    Investigating how individual molecular components interact with one another within DNA nanoarchitectures, both in terms of their spatial and temporal interactions, is fundamentally important for a better understanding of their physical behaviors. This will provide researchers with valuable insight for designing more complex higher-order structures that can be assembled more efficiently. In this report, we examined several spatial factors that affect the kinetics of bivalent, double-helical (DH) tile dimerization, including the orientation and number of sticky ends (SEs), the flexibility of the double helical domains, and the size of the tiles. The rate constants we obtained confirm our hypothesis that increased nucleation opportunities and well-aligned SEs accelerate tile–tile dimerization. Increased flexibility in the tiles causes slower dimerization rates, an effect that can be reversed by introducing restrictions to the tile flexibility. The higher dimerization rates of more rigid tiles results from the opposing effects of higher activation energies and higher pre-exponential factors from the Arrhenius equation, where the pre-exponential factor dominates. We believe that the results presented here will assist in improved implementation of DNA tile based algorithmic self-assembly, DNA based molecular robotics, and other specific nucleic acid systems, and will provide guidance to design and assembly processes to improve overall yield and efficiency. PMID:24794259

  15. An automatic adiabatic bomb calorimeter

    Microsoft Academic Search

    W F Raymond; R J Canaway; C E Harris

    1957-01-01

    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,

  16. Prospects for and tests of hadron calorimetry with silicon

    SciTech Connect

    Brau, James E. [Univ. of Oregon, OR (United States). Dept. of Physics] [Univ. of Oregon, OR (United States). Dept. of Physics; Gabriel, Tony A. [Oak Ridge National Lab., TN (United States)] [Oak Ridge National Lab., TN (United States); Rancoita, P. G. [INFN, Milan (Italy)] [INFN, Milan (Italy)

    1989-03-01

    Hadron calorimetry with silicon may provide crucial capabilities in experiments at the high luminosity, high energy colliders of the future, particularly due to silicon's fast intrinsic speed and absolute calibration. The important underlying processes of our understanding of hadron calorimeters are reviewed to set the framework for the presentation of recent calculations of the expected performance of silicon detector based hadron calorimeters. Such devices employing uranium are expected to achieve the compensation condition (that is, the ratio of the most probable electron signal to hadron signal (e/h) is approx.1.0) based on the understanding that has been derived from the uranium-liquid argon and uranium-plastic scintillator systems. In fact, even lead-silicon calorimeters are found to achieve the attractive value for the e/h ratio of 1.16 at 10 GeV. An experimental test of these predictions is underway at CERN by the SICAPO Collaboration. 64 refs., 19 figs.

  17. Triangle Tiling I: the tile is similar to ABC or has a right angle

    E-print Network

    Beeson, Michael

    Triangle Tiling I: the tile is similar to ABC or has a right angle Michael Beeson June 6, 2012 Abstract An N-tiling of triangle ABC by triangle T is a way of writing ABC as a union of N triangles congruent to T, overlapping only at their boundaries. The triangle T is the "tile". The tile may or may

  18. Experimental aerodynamic heating to simulated shuttle tiles

    Microsoft Academic Search

    D. E. Avery; P. A. Kerr; A. R. Wieting

    1983-01-01

    The heat transfer to simulated shuttle thermal protection system tiles was investigated experimentally using a highly instrumented metallic thin wall tile arranged with other metal tiles in a staggered tile array. Cold-wall heating rate data for laminar and turbulent flow were obtained in the Langley 8-foot high temperature tunnel at a nominal Mach number of 7, a nominal total temperature

  19. Repairing high-temperature glazed tiles

    NASA Technical Reports Server (NTRS)

    Ecord, G. M.; Schomburg, C.

    1981-01-01

    Tetraethyl orthosilicate (TEOS) mixture fills chips and cracks in glazed tile surface. Filler is made by mixing hydrolyzed TEOS, silicon tetraboride powder, and pulverized tile material. Repaired tiles survived testing by intense acoustic emissions, arc jets, and intense heat radiation. Repair is reliable and rapid, performed in 1-1 1/2 hours with tile in any or orientation.

  20. Beam tests of the DØ uranium liquid argon end calorimeters

    NASA Astrophysics Data System (ADS)

    Abachi, S.; Ahn, S.; Abolins, M.; Aihara, H.; Amos, N.; Antipov, Y.; Aronson, S. H.; Astur, R.; Avellaneda, R.; Avery, R. E.; Baden, A. R.; Baldin, B.; Bantly, J.; Barasch, E.; Bartlett, J. F.; Bazizi, K.; Behnke, T.; Bezzubov, V.; Bhat, P.; Blazey, G. C.; Blessing, S.; Bogert, D.; Borcherding, F.; Borders, J.; Bozko, N.; Brock, R.; Bross, A. D.; Buchholz, D.; Bulgakov, N.; Burtovoy, V.; Butler, J. M.; Cence, R.; Chekulaev, S.; Cherny, S.; Chen, J.; Christenson, J. H.; Clark, A. R.; Cochran, J.; Cooper, W. E.; Cretsinger, C.; Cullen-Vidal, D.; Cutts, D.; Dahl, O. I.; Davidenko, A.; De, K.; Demarteau, M.; Denisov, D.; Denisov, S.; Dharmaratna, W.; Diehl, H. T.; Diesburg, M.; Dixon, R.; Draper, P.; Ducros, Y.; Dugan, G.; Durston, S.; Dyakonenkov, A.; Eartly, D.; Edmunds, D.; Efimov, A.; Ellison, J.; Engelmann, R.; Eroshin, O.; Evdokimov, V.; Fahey, S.; Fatyga, M.; Featherly, J.; Feher, S.; Ferbel, T.; Finley, D.; Finocchiaro, G.; Fisk, H. E.; Forden, G. E.; Fortner, M.; Franzini, P.; Fuess, S.; Gao, C. S.; Geld, T.; Genser, K.; Gibbard, B. G.; Glebov, V.; Glicenstein, J.-F.; Gobbi, B.; Goforth, M.; Good, M. L.; Gordon, H. A.; Graf, N.; Grannis, P. D.; Green, D. R.; Green, J.; Greenlee, H.; Grudberg, P.; Guida, J. A.; Guida, J. M.; Guryn, W.; Hadley, N. J.; Haggerty, H.; Hagopian, S.; Hall, R.; Hedin, D.; Heuring, T.; Hirosky, R.; Hoftun, J.; Hubbard, J. F.; Huehn, T.; Huson, R.; Igarashi, S.; Ito, A. S.; Johnson, M. E.; Jonckheere, A. M.; Johns, K.; Jostlein, H.; Karsh, W.; Kahn, S.; Kernan, A.; Kerth, L.; Kholodenko, A.; Kirunin, A.; Kistenev, E.; Klatchko, A.; Klima, B.; Klochkov, B.; Klopfenstein, C.; Klyukhin, V.; Kochetkov, V.; Kononenko, W.; Kotcher, J.; Kotov, I.; Kourlas, J.; Kozlovsky, E.; Kunori, S.; Krzywdzinzski, S.; Lanou, R.; Laurens, P.; Lee-Franzini, J.; Li, R.; Li-Demarteau, Q. Z.; Linnemann, J. T.; Linn, S. L.; Lipton, R.; Lobkowicz, F.; Loken, S. C.; Lökös, S.; Lucas, P.; Madaras, R. J.; Madden, R.; Malamud, E.; Mangeot, Ph.; Mansoulié, B.; Manning, I.; Mao, H.-S.; Marshall, T.; Martin, P. S.; Martin, H. J.; Marx, M.; Mayorov, A.; McCarthy, R.; McKinley, J.; Meng, X. C.; Merritt, K. W.; Milder, A.; Mincer, A.; Mooney, P.; Morphis, R.; Mudan, M.; Murphy, C. T.; Nang, F.; Narasimham, V. S.; Neal, H. A.; Nemethy, P.; Neši?, D.; Ng, K.; Norman, D.; Oesch, L.; Oltman, E.; Oshima, N.; Owen, D. L.; Owen, D. P.; Partridge, R.; Paterno, M.; Peryshkin, A.; Peters, M.; Pi, B.; Piekarz, H.; Pischalnikov, Y.; Pizzuto, D.; Platonov, V.; Pluquet, A.; Podstavkov, V.; Pope, B. G.; Prosper, H.; Protopopescu, S.; Raja, R.; Rajagopalan, S.; Rasmussen, L.; Read, A. L.; Ren, T. M.-L.; Repond, S.; Riadovikov, V.; Rijssenbeek, M.; Roe, N. A.; Rubinov, P.; Ruland, R.; Rutherfoord, J.; Schamberger, R. D.; Sculli, J.; Selove, W.; Shkurenkov, A.; Shupe, M.; Smart, W.; Smith, D.; Smith, R. P.; Snow, G. R.; Spadafora, A. L.; Stephens, R.; Stevenson, M. L.; Stewart, C.; Stocker, F.; Stoyanova, D.; Streets, K.; Strovink, M.; Suhanov, A.; Taketani, A.; Tartaglia, M.; Teiger, J.; Theodosiou, G.; Thompson, J.; Tisserant, S.; Trippe, T. G.; Tuts, P. M.; Van Berg, R.; Vorobiev, A.; Wahl, H. D.; Weerts, H.; Wenzel, W. A.; White, A. P.; White, J. T.; Willis, S.; Wightman, J. A.; Wimpenny, S. J.; Wolf, Z.; Womersley, J.; Xia, Y.; Xie, P.; Xu, H.; Xu, J.; Yamada, R.; Yamin, P.; Yang, J.; Yang, M.-J.; Yoshikawa, C.; Youssef, S.; Yu, J.; Zeller, R.; Zhou, Y. H.; Zhu, Q.; Zieminska, D.; Zieminski, A.; Zotov, A.; Zylberstejn, A.; DØ Collaboration

    1993-01-01

    We describe the results of beam tests of three uranium-liquid argon calorimeter modules constructed for the DØ detector at the Fermilab Tevatron collider. As part of the calibration procedure, these modules were exposed to beams of electrons, pions and muons between 10 and 150 GeV/ c before their installation in the end calorimeter of the completed DØ detector. We obtain an electromagnetic sampling resolution of 15.7%/? E and constant term of 0.3%. The hadronic sampling resolution is 45%/? E (degraded to 50%/? E by the effects of upstream material) and the constant term is 4%. The calorimeter is linear to 0.5%, and the electromagnetic to hadronic response ratio is between 1.02 and 1.09 over this range of momenta. For an electron efficiency of 95% we obtain a rejection factor against pions of ˜ 900-3000 for particles in the momentum range between 50 and 150 GeV/ c. We also compare our results with the predictions of a detailed Monte Carlo simulation.

  1. A liquid argon calorimeter prototype for forward region at the LHC

    NASA Astrophysics Data System (ADS)

    Artamonov, A.; Epstein, V.; Gorbunov, P.; Jemanov, V.; Khovansky, V.; Kuchenkov, A.; Kruchinin, S.; Maslennikov, A.; Rjabinin, M.; Shatalov, P.; Vinogradov, V.; Zaitsev, V.; Zeldovich, S.; Zuckerman, I.

    1996-02-01

    We report on the design and on beam test results of a liquid argon calorimeter prototype. This technology was proposed as an option for the forward region of an experiment at the future Large Hadron Collider (LHC) at CERN. The measurements were performed using electrons from the ITEP PS with an energy range of 1 to 5 GeV.

  2. Performance of a sampling calorimeter with alternate U and Fe absorbers

    NASA Astrophysics Data System (ADS)

    De Vincenzi, M.; Di Liberto, S.; Frenkel, A.; Lamanna, E.; Marini, G.; Martellotti, G.; Nigro, A.; Penso, G.; Petrera, S.; Pistilli, P.; Romano, G.; Rosa, G.; Sciubba, A.; Catanesi, M. G.; Muciaccia, M. T.; Nuzzo, S.; Ruggieri, F.; Cobbaert, H.; Roosen, R.; Crosetti, G.; Fidecaro, M.; Poulard, G.; Sletten, H.; Coupland, M.; Trent, P. T.; Bartley, J. H.; Duff, B. G.; Esten, M. J.; Fennel, P.; Imrie, D. C.; Harrison, P.; Heymann, F. F.; Bisi, V.; Gamba, D.; Ramello, L.; Riccati, L.; WA78 Collaboration

    1986-08-01

    A sampling hadronic calorimeter, consisting of a sandwich of scintillator plates and alternate U and Fe absorbers, has been tested in a 135 GeV energy beam. The energy resolution turns out to be significantly improved with respect to the homogeneous configurations in which only U or Fe absorbers are used.

  3. Performance of a sampling calorimeter with alternate U and Fe absorbers

    Microsoft Academic Search

    M. de Vincenzi; S. di Liberto; A. Frenkel; E. Lamanna; G. Marini; G. Martellotti; A. Nigro; G. Penso; S. Petrera; P. Pistilli; G. Romano; G. Rosa; A. Sciubba; M. G. Catanesi; M. T. Muciaccia; S. Nuzzo; F. Ruggieri; H. Cobbaert; R. Roosen; G. Crosetti; Maria Fidecaro; G. Poulard; H. Sletten; M. Coupland; P. T. Trent; J. H. Bartley; Brian G Duff; M. J. Esten; P. Fennel; D. C. Imrie; P. Harrison; Franz F Heymann; V. Bisi; D. Gamba; L. Ramello; L. Riccati

    1986-01-01

    A sampling hadronic calorimeter, consisting of a sandwich of scintillator plates and alternate U and Fe absorbers, has been tested in a 135 GeV energy beam. The energy resolution turns out to be significantly improved with respect to the homogeneous configurations in which only U or Fe absorbers are used.

  4. How to morph tilings injectively

    Microsoft Academic Search

    Michael S. Floater; Craig Gotsman

    1999-01-01

    We describe a method based on convex combinations for morphing corresponding pairs of tilings in R2. It is shown that the method always yields a valid morph when the boundary polygons are identical, unlike the standard linear morph.

  5. Hadron hadron collider group

    SciTech Connect

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

    1982-01-01

    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.

  6. A Luminosity Calorimeter for CLIC

    E-print Network

    Abramowicz, H; Kananov, S; Levy, A; Sadeh, I

    2009-01-01

    For the relative precision of the luminosity measurement at CLIC, a preliminary target value of 1% is being assumed. This may be accomplished by constructing a finely granulated calorimeter, which will measure Bhabha scattering at small angles. In order to achieve the design goal, the geometrical parameters of the calorimeter need to be defined. Several factors influence the design of the calorimeter; chief among these is the need to minimize the error on the luminosity measurement while avoiding the intense beam background at small angles. In this study the geometrical parameters are optimized for the best performance of the calorimeter. In addition, the suppression of physics background to Bhabha scattering is investigated and a set of selection cuts is introduced.

  7. Self-Similar Lattice Tilings

    Microsoft Academic Search

    Karlheinz Grochenig; Andrew Haas

    1994-01-01

    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

  8. Lozenge tilings and Hurwitz numbers

    E-print Network

    Jonathan Novak

    2014-12-27

    We give a new proof of the fact that, near a turning point of the frozen boundary, the vertical tiles in a uniformly random lozenge tiling of a large sawtooth domain are distributed like the eigenvalues of a GUE random matrix. Our argument uses none of the standard tools of integrable probability. In their place, it uses a combinatorial interpretation of the Harish-Chandra/Itzykson-Zuber integral as a generating function for desymmetrized Hurwitz numbers.

  9. Muon g-2 Calorimeter Prototypes

    SciTech Connect

    Polly, Chris; /Fermilab

    2010-05-03

    The proposed design is a tungsten-scintillating fiber calorimeter with 35 segments, each read out by a separate PMT. Tungsten, which is significantly denser than lead, produces compact showers. This is necessary, in order to improve shower separation in analysis and to fully contain the showers within a calorimeter that satisfies the strict space constraints of the experiment. A single calorimeter segment (4 x 6 x 15 cm{sup 3}) has been constructed in order establish the feasibility of the new design and study its properties. Initial tests of the detector segment at the Paul Scherrer Institute were conducted with a low energy < 400 MeV/c electron beam. A higher-energy test with electrons up to a few GeV/c was performed at the Test Beam Facility under the experimental number T-967. All data from that test have been analyzed and published, and the tungsten-scintillating fiber calorimeter still appears to be a viable candidate. For this test beam run, a larger calorimeter (15 x 15 x 11 cm{sup 3}) has been constructed and an emphasis will be placed on understanding shower leakage and the ability to separate pileup events with a more granular readout. The experimenters will measure the energy resolution, linearity, and shower size of the calorimeter segment. This will provide important information for finalizing decisions on the angle of the fibers relative to the incoming electrons and the optimal granularity of the readout.

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

    PubMed Central

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

    2012-01-01

    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

  11. Electron Calorimeter Experiment

    NASA Technical Reports Server (NTRS)

    Adams, James H.

    2008-01-01

    Boron loaded scintillators are suitable for measuring secondary neutrons produced by high-energy particles: protons & electrons Neutron flux can be used to discriminate hadron and electro-magnetic particles Combined effectiveness of all e/p discriminators techniques employedTBD Only moderate improvement in detection efficiency for B-10 concentrations >few% in thick moderators Bottom scintillator might serve as cascade penetration counter (TBC)

  12. Power/Crate Calorimeter

    E-print Network

    .00 ­15.0 1.00 45.00 Hadron ASD M. Cordelli 10U CDF VIPA 0.26 5.0 1.86 ­5.0 1.088 15.0 ­15.0 16.00 Muon ASD V. Simiatis 10U CDF VIPA 5.00 5.0 ­5.0 5.00 15.0 ­15.0 50.00 Muon TDC M. Campbell 10U CDF VIPA SMX

  13. A Silicon Pad Shower Maximum Detector for a Shashlik Calorimeter

    NASA Astrophysics Data System (ADS)

    Alvsvaag, S. J.; Maeland, O. A.; Klovning, A.; Benvenuti, A. C.; Giordano, V.; Guerzoni, M.; Navarria, F. L.; Verardi, M. G.; Camporesi, T.; Vallazza, E.; Bozzo, M.; Cereseto, R.; Barreira, G.; Espirito Santo, M. C.; Maio, A.; Onofre, A.; Peralta, L.; Pimenta, M.; Tome, B.; Carling, H.; Falk, E.; Hedberg, V.; Jarlskog, G.; Kronkvist, I.; Bonesini, M.; Chignoli, F.; Ferrari, P.; Gumenyuk, S.; Leoni, R.; Mazza, R.; Negri, P.; Paganoni, M.; Petrovykh, L.; Terranova, F.; Dharmasiri, D. R.; Nossum, B.; Read, A. L.; Skaali, B.; Castellani, L.; Pegoraro, M.; Fenyuk, A.; Gouz, I.; Ivaniouchenkov, I.; Karioukhine, A.; Obraztsov, V.; Vlasov, E.; Zaitsev, A.; Bigi, M.; Cassio, V.; Gamba, D.; Migliore, E.; Romero, A.; Simonetti, L.; Torassa, E.; Trapani, P. P.; Bari, M.; Della Ricca, G.; Lanceri, L.; Poropat, P.; Prest, M.

    1995-11-01

    The new luminosity monitor of the DELPHI detector, STIC (Small angle TIle Calorimeter), was built using a Shashlik technique. This technique does not provide longitudinal sampling of the showers, which limits the measurement of the direction of the incident particles and the e — ? separation. For these reasons STIC was equipped with a Silicon Pad Shower Maximum Detector (SPSMD). In order to match the silicon detectors to the Shashlik read out by wavelength shifter (WLS) fibers, the silicon wafers had to be drilled with a precision better than 10 ?m without damaging the active area of the detectors. This paper describes the SPSMD with emphasis on the fabrication techniques and on the components used. Some preliminary results of the detector performance from data taken with a 45 GeV electron beam at CERN are presented.

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

    SciTech Connect

    Andrew Stroud, Lee Sawyer

    2012-08-31

    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.

  15. Calorimeter Process Variable Archiving

    SciTech Connect

    Huffman, David; /Fermilab

    2002-01-14

    These steps were taken to maintain weekly archives: (1) Friday morning you stop the archiver and wait for it to finish writing data (the lock file will be removed from the directory); (2) move the current archive information to a PC via FTP; (3) remove all previous archive information in the previous directory; (4) move the current archive into the previous directory; (5) start a new archive; (6) burn a CDROM of the archive; and (7) copy the current archive to a specific directory. There are 2 ways to check if the Calorimeter Archiver is running, either through the WEB based front end or directly from a command line. Once the archiver is running it can be monitored from a WEB page. This only works with a browser launched from the online machine running the archiver. Each time the browser is reloaded there should be an update reported in the last write check field. You might have to wait a few minutes to see the update. Calorimetry currently takes readings every (300 sec.) 5 minutes. The second method to verify the archiver is running is to issue a command from a Linux cluster machine.

  16. Hadron-hadron colliders

    SciTech Connect

    Month, M.; Weng, W.T.

    1983-06-21

    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.

  17. Penrose Tilings by Pentacles can be 3Colored

    Microsoft Academic Search

    J. Caceres; M. E. Gegundez; A. Marquez

    2002-01-01

    There are many aperiodic tilings of the plane. The chromatic number of a tiling is the minimum number of colors needed to color the tiles in such a way that every pair of adjacent tiles have distinct colors. In this paper the problem is solved for the last Penrose tiling for which the problem remained unsolved, the Penrose tilings by

  18. The ATLAS liquid argon calorimeter: upgrade plans for the HL-LHC

    NASA Astrophysics Data System (ADS)

    Novgorodova, Olga; ATLAS Liquid Argon Calorimeter Group

    2015-02-01

    The ATLAS detector was designed and built to study proton-proton collisions produced at the LHC at centre-of-mass energies up to 14 TeV and instantaneous luminosities up to 1034 cm?2s?1. Liquid argon (LAr) sampling calorimeters are employed for electromagnetic and hadronic calorimetry. The luminosity for the proposed High Luminosity LHC phase (HL-LHC) will increase up to 5×1034 cm?2s?1 with the goal of accumulating an integrated luminosity of 3000 fb?1. This is well beyond the values for which the detectors were designed. The electromagnetic and hadronic calorimeters will be able to tolerate the increased particle flux, but the performance of the forward calorimeter (FCal) will be affected. Two possible solutions for keeping the current performance are being discussed. The readout electronics will also need to withstand larger radiation environment. In the hadronic endcap calorimeter (HEC) cold GaAs preamplifiers are located inside the endcap cryostats. The properties of these devices have been investigated in recent proton and neutron irradiation tests to determine whether they must be replaced. In addition, the entire front-end readout system is not expected to survive the integrated luminosity at the HL-LHC and will be replaced. The description of the new readout system is presented.

  19. Tiling with Ls and Squares 1 Tiling with Ls and Squares

    E-print Network

    Heubach, Silvia

    Tiling with Ls and Squares 1 Tiling with Ls and Squares Silvia Heubach Department of Mathematics California State University Los Angeles joint work with Phyllis Chinn and Ralph Grimaldi #12;Tiling with Ls. Benjamin and J.J. Quinn, Proofs that Really Count, MAA 2003 #12;Tiling with Ls and Squares 3 Things to come

  20. Scintillating fiber ribbon-tungsten calorimeter

    NASA Astrophysics Data System (ADS)

    Bross, A.; Crisler, M.; Kross, B.; Wrbanek, J.

    1990-01-01

    We describe an ultra-high density scintillating fiber and tungsten calorimeter used as an active beam-dump for electrons. Data showing the calorimeter response to electrons with momenta between 50 and 350 GeV/ c are presented.

  1. Muon Identification in the ATLAS Calorimeters

    E-print Network

    van Suijlekom, Walter

    Muon Identification in the ATLAS Calorimeters #12;#12;Muon Identification in the ATLAS Calorimeters . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.2.3 Muon spectrometer . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2.2.4 The forward . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2.2.6 The trigger system . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3 Muon

  2. A Shannon theoretic study of Penrose tilings

    Microsoft Academic Search

    E. Soljania

    1998-01-01

    Penrose tilings represent interesting objects in various branches of mathematics such as algebra, combinatorics, dynamical system theory, and the theory of quasicrystals. We are interested in Penrose tilings as a means of communicating information

  3. On $K_0$-Groups for Substitution Tilings

    E-print Network

    Johannes Kellendonk

    1995-03-03

    The group $C(\\Om,\\Z)/\\E$ is determined for tilings which are invariant under a locally invertible primitive \\sst\\ which forces its \\saum. In case the tiling may be obtained by the generalized dual method from a regular grid this group furnishes part of the $K_0$-group of the algebra of the tiling. Applied to Penrose tilings one obtains $K_0(\\A_\\tl)=\\Z^8\\oplus\\Z$.

  4. C ? -algebras of Penrose hyperbolic tilings

    Microsoft Academic Search

    Hervé Oyono-Oyono; Samuel Petite

    2011-01-01

    Penrose hyperbolic tilings are tilings of the hyperbolic plane which admit, up to affine transformations a finite number of prototiles. In this paper, we give a complete description of the C?-algebras and of the K-theory for such tilings. Since the continuous hull of these tilings have no transversally invariant measure, these C?-algebras are traceless. Nevertheless, harmonic currents give rise to

  5. Composite treatment of ceramic tile armor

    DOEpatents

    Hansen, James G. R. (Oak Ridge, TN) [Oak Ridge, TN; Frame, Barbara J. (Oak Ridge, TN) [Oak Ridge, TN

    2010-12-14

    An improved ceramic tile armor has a core of boron nitride and a polymer matrix composite (PMC) facing of carbon fibers fused directly to the impact face of the tile. A polyethylene fiber composite backing and spall cover are preferred. The carbon fiber layers are cured directly onto the tile, not adhered using a separate adhesive so that they are integral with the tile, not a separate layer.

  6. Composite treatment of ceramic tile armor

    DOEpatents

    Hansen, James G. R. (Oak Ridge, TN); Frame, Barbara J. (Oak Ridge, TN)

    2012-01-02

    An improved ceramic tile armor has a core of boron nitride and a polymer matrix composite (PMC) facing of carbon fibers fused directly to the impact face of the tile. A polyethylene fiber composite backing and spall cover are preferred. The carbon fiber layers are cured directly onto the tile, not adhered using a separate adhesive so that they are integral with the tile, not a separate layer.

  7. Performance Studies of Prototype II for the CASTOR forward Calorimeter at the CMS Experiment

    E-print Network

    X. Aslanoglou; N. Bakirci; S. Cerci; A. Cyz; D. d'Enterria; E. Gladysz-Dziadus; L. Gouskos; A. Ivashkin; C. Kalfas; P. Katsas; A. Kuznetsov; Y. Musienko; A. D. Panagiotou; E. Vlassov

    2007-06-20

    We present results of the performance of the second prototype of the CASTOR quartz-tungsten sampling calorimeter, to be installed in the very forward region of the CMS experiment at the LHC. The energy linearity and resolution, as well as the spatial resolution of the prototype to electromagnetic and hadronic showers are studied with E=20-200 GeV electrons, E=20-350 GeV pions, and E=50,150 GeV muons from beam tests carried out at CERN/SPS in 2004. The responses of the calorimeter using two different types of photodetectors (avalanche photodiodes APDs, and photomultiplier tubes PMTs) are compared.

  8. CLUSTER INTERACTIONS FOR QUASIPERIODIC TILINGS FRANZ GAHLER

    E-print Network

    Gähler, Franz

    CLUSTER INTERACTIONS FOR QUASIPERIODIC TILINGS FRANZ G¨AHLER Centre de Physique Th´eorique, Ecole Polytechnique, F-91128 Palaiseau, France A cluster for the octagonal square-rhombus tiling is presented, which has the prop- erty that among all tilings completely covered by the cluster the perfectly quasiperi

  9. Penrose tilings as coverings of congruent decagons

    Microsoft Academic Search

    Petra Gummelt

    1996-01-01

    The open problem of tiling theory whether there is a single aperiodic two-dimensional prototile with corresponding matching rules, is answered for coverings instead of tilings. We introduce admissible overlaps for the regular decagon determining only nonperiodic coverings of the Euclidean plane which are equivalent to tilings by Robinson triangles. Our work is motivated by structural properties of quasicrystals.

  10. Localized Densification of Tile for Impact Resistance

    NASA Technical Reports Server (NTRS)

    Smiser, Laurence W.; Holt, Jack W.

    1987-01-01

    Densification process increases impact resistance of lightweight, porous silica tile without appreciably raising weight. Colloidal suspension of silica used to increase density of small portion of tile to be strengthened. Process controls penetration of suspension laterally and vertically so densification limited to volume where needed. Insures weight increased only minimally. See also "Attaching Metal Fasteners to Silica Tiles" (MSC-20537).

  11. Relaxation calorimeter for hydrogen thermoporometry

    NASA Astrophysics Data System (ADS)

    Van Cleve, E.; Worsley, M. A.; Kucheyev, S. O.

    2013-05-01

    A relaxation calorimeter for measuring the heat capacity of hydrogen isotopes in nanoporous solids is described. Apparatus' features include (i) cooling by a pulse tube refrigerator, (ii) a modular design, allowing for rapid reconfiguration and sample turn around, (iii) a thermal stability of ?1 mK, and (iv) a bottom temperature of ˜5 K. The calorimeter is tested on effective heat capacity measurements of H2 in Vycor (silica) nanoporous glass, yielding a very detailed pore size distribution analysis with an effectively sub-Angstrom resolution.

  12. Relaxation calorimeter for hydrogen thermoporometry.

    PubMed

    Van Cleve, E; Worsley, M A; Kucheyev, S O

    2013-05-01

    A relaxation calorimeter for measuring the heat capacity of hydrogen isotopes in nanoporous solids is described. Apparatus' features include (i) cooling by a pulse tube refrigerator, (ii) a modular design, allowing for rapid reconfiguration and sample turn around, (iii) a thermal stability of ?1 mK, and (iv) a bottom temperature of ~5 K. The calorimeter is tested on effective heat capacity measurements of H2 in Vycor (silica) nanoporous glass, yielding a very detailed pore size distribution analysis with an effectively sub-Angstrom resolution. PMID:23742560

  13. Texture mapping using tiled textures 

    E-print Network

    Kaur, Avneet

    2004-09-30

    TEXTURE MAPPING USING TILED TEXTURES A Thesis by AVNEET KAUR Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May 2003 Major Subject: Visualization...: __________________________ __________________________ Ergun Akleman Donald House (Chair of Committee) (Member) __________________________ __________________________ Jianer Chen Phillip...

  14. An isothermal micro-calorimeter

    Microsoft Academic Search

    J B Stott

    1956-01-01

    A calorimeter is described which, although nearly isothermal and independent of the specific heats of the materials employed, can still be used over a wide range of temperatures and makes use of a bank of thermocouples to measure the heat evolved. An attempt is made to obtain the maximum theoretical sensitivity by making most of the heat produced pass down

  15. Hadronic decays

    E-print Network

    C. Michael

    2005-09-09

    Hadronic decays and transitions are a key ingredient of hadronic physics. I discuss how hadronic decays can be explored in lattice gauge theory and review studies undertaken. I also discuss the impact of decays on masses and how lattice studies can explore the nature of a hadronic state: namely whether it is a molecular or quark-antiquark state. A brief discussion of lattice exploration of pentaquark states is presented.

  16. Response of the D0 calorimeter to cosmic ray muons

    SciTech Connect

    Kotcher, J.

    1992-10-01

    The D0 Detector at the Fermi National Accelerator Laboratory is a large multipurpose detector facility designed for the study of proton-antiproton collision products at the center-of-mass energy of 2 TeV. It consists of an inner tracking volume, hermetic uranium/liquid argon sampling calorimetry, and an outer 47{pi} muon detector. In preparation for our first collider run, the collaboration organized a Cosmic Ray Commissioning Run, which took place from February--May of 1991. This thesis is a detailed study of the response of the central calorimeter to cosmic ray muons as extracted from data collected during this run. We have compared the shapes of the experimentally-obtained pulse height spectra to the Landau prediction for the ionization loss in a continuous thin absorber in the four electromagnetic and four hadronic layers of the calorimeter, and find good agreement after experimental effects are folded in. We have also determined an absolute energy calibration using two independent methods: one which measures the response of the electronics to a known amount of charge injected at the preamplifiers, and one which uses a carry-over of the calibration from a beam test of central calorimeter modules. Both absolute energy conversion factors agree with one another, within their errors. The calibration determined from the test beam carryover, relevant for use with collider physics data, has an error of 2.3%. We believe that, with further study, a final error of {approx}1% will be achieved. The theory-to-experiment comparison of the peaks (or most probable values) of the muon spectra was used to determine the layer-to-layer consistency of the muon signal. We find that the mean response in the 3 fine hadronic layers is (12 {plus_minus} 2%) higher than that in the 4 electromagnetic layers. These same comparisons have been used to verify the absolute energy conversion factors. The conversion factors work well for the electromagnetic sections.

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

    SciTech Connect

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

    1990-07-01

    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.

  18. Estimation of radiation eects in the front-end electronics of the Electromagnetic Calorimeter using physics events

    Microsoft Academic Search

    V. Bartsch; M. Postranecky; C. Targett-Adams; M. Warren; M. Wing

    2007-01-01

    The front-end electronics of the electromagnetic calorimeter of an ILC detector are situated in a radiation environment. Therefore it needs to be checked how the ra- diation will aect the performance of the electronics. In this paper, physics events and hadron events originating from the machine background have been simulated and radiation eects within the volumes in which the front-end

  19. The NA49 large acceptance hadron detector

    Microsoft Academic Search

    S V Afanasiev; T. Alber; H. Appelshäuser; J. Bächler; D. Barna; L. S. Barnby; Jerzy Bartke; R. A. Barton; L. Betev; H. Bialkowska; F. Bieser; A. Billmeier; C. O. Blyth; R K Böck; C. Bormann; J. Bracinik; F. P. Brady; R. Brockmann; R. Brun; P. Buncic; H. L. Caines; D. Cebra; G. E. Cooper; J. G. Cramer; P. Csato; M. Cyprian; J. Dunn; V. Eckardt; F. Eckhardt; T. Empl; J. Eschke; M. I. Ferguson; H. Fessler; H. G. Fischer; D. Flierl; Z. Fodor; Ulrich Frankenfeld; P Y Foka; P. Freund; V. Friese; J. Ftacnik; M. Fuchs; F. Gabler; J. Gal; R E Ganz; M. Gazdzicki; E Gladysz-Dziadus; J. Grebieszkow; J. Günther; J. W. Harris; S. Hegyi; T. Henkel; L. A. Hill; V. Hlinka; I. Huang; H. Hümmler; G. Igo; D. Irmscher; M. Ivanov; R. Janik; P. Jacobs; P. G. Jones; K. Kadija; V. I. Kolesnikov; M. Kowalski; B. Lasiuk; Peter Lévai; K. Liebicher; U. Lynen; A. I. Malakhov; S. Margetis; C. Markert; C. Marks; B W Mayes; G. L. Melkumov; A. Mock; J. Molnár; J. M. Nelson; M. Oldenburg; Grazyna Janina Odyniec; G. Palla; A. D. Panagiotou; Yu N Pestov; A. Petridis; M. Pikna; W. Pimpl; L. Pinsky; A. Piper; R. J. Porter; A. M. Poskanzer; S. Poziombka; D. J. Prindle; F. Pühlhofer; W. Rauch; J. G. Reid; R E Renfordt; W. Retyk; H. G. Ritter; D. Röhrich; C. Roland; G. Roland; H. Rudolph; A. Rybicki; T. Sammer; A. Sandoval; H. Sann; E. Schäfer; R. Schmidt; D. Schmischke; N. Schmitz; S. Schönfelder; A. Yu. Semenov; J. Seyboth; P. Seyboth; J. Seyerlein; F. Sikler; B. Sitar; E. Skrzypczak; G. T. A. Squier; H. Stelzer; Reinhard Stock; P. Strmen; H. Ströbele; C. Struck; T. Susa; I. Szarka; I. Szentpetery; P. Szymanski; J. Sziklai; M. Toy; T. A. Trainor; S. Trentalange; T S Ullrich; Maria Vassiliou; G I Veres; G. Vesztergombi; D. Vranic; F. Q. Wang; D. D. Weerasundara; S. Wenig; C. Whitten; H H Wieman; T. Wienold; L. Wood; T. A. Yates; J. Zimanyi; X.-Z. Zhu; R. Zybert

    1999-01-01

    The NA49 detector is a wide acceptance spectrometer for the study of hadron production in p+p, p+A, and A+A collisions at the CERN SPS. The main components are 4 large-volume TPCs for tracking and particle identification via dE\\/dx. TOF scintillator arrays complement particle identification. Calorimeters for transverse energy determination and triggering, a detector for centrality selection in p+A collisions, and

  20. Geometrical Tile Design for Complex Neighborhoods

    PubMed Central

    Czeizler, Eugen; Kari, Lila

    2009-01-01

    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?×?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 × (2k?+?1) rectangle. PMID:19956398

  1. The e/{pi} and {pi}{sup 0}/{pi} ratios measured, and monochromatic {gamma} and {pi}{sup 0} beams explored in the D0 test calorimeter

    SciTech Connect

    Tartaglia, M.A.; D0 Collaboration

    1992-10-01

    The e/{pi} response ratio of the DO end calorimeter has been measured by comparing data from 10 to 150 GeV/c electron and pion beams. The ``intrinsic`` e/{pi} of the fine-hadronic module has also been studied with the pions alone, by selecting {pi}{sup 0}-like showers contained within individual layers of the calorimeter. The measurements are compared to GEANT Monte Carlo simulations. A technique to generate monochromatic test beams of photons and neutral pions was successfully investigated. Preliminary results from central calorimeter modules exposed to these beams are discussed, and are compared to calculated expectations.

  2. Kaleidoscopic Tilings on Surfaces, thisKaleidoscopic Tilings on Surfaces, this Time with the GroupsTime with the Groups

    E-print Network

    Broughton, S. Allen

    1 Kaleidoscopic Tilings on Surfaces, thisKaleidoscopic Tilings on Surfaces, this Time · Tilings of surfaces and the plane­ examples, definition · Kaleidoscopic tilings of the hyperbolic plane S be a surface of genus . · Tiling: Covering by polygons "without gaps and overlaps" · Kaleidoscopic: Symmetric

  3. Thermal Equilibrium Calorimeters -- An Introduction

    E-print Network

    McCammon, D

    2005-01-01

    Near-equilibrium thermal detectors operate as classical calorimeters, with energy deposition and internal equilibration times short compared to the thermal time constant of the device. Advances in fabrication techniques, cryogenics, and electronics have made it practical to measure deposited energy with unprecedented sensitivity and precision. In this chapter we discuss performance considerations for these devices, including optimal filtering and energy resolution calculations. We begin with the basic theory of simple equilibrium calorimeters with ideal resistive thermometers. This provides a starting point for a brief discussion of electrothermal feedback, other noise sources, various non-ideal effects, and nonlinearity. We then describe other types of thermometers and show how they fit into this theoretical framework and why they may require different optimizations and figures of merit. Most of this discussion is applicable also to power detectors, or bolometers, where the detector time constants may be sho...

  4. Thermal Equilibrium Calorimeters -- An Introduction

    E-print Network

    Dan McCammon

    2005-03-07

    Near-equilibrium thermal detectors operate as classical calorimeters, with energy deposition and internal equilibration times short compared to the thermal time constant of the device. Advances in fabrication techniques, cryogenics, and electronics have made it practical to measure deposited energy with unprecedented sensitivity and precision. In this chapter we discuss performance considerations for these devices, including optimal filtering and energy resolution calculations. We begin with the basic theory of simple equilibrium calorimeters with ideal resistive thermometers. This provides a starting point for a brief discussion of electrothermal feedback, other noise sources, various non-ideal effects, and nonlinearity. We then describe other types of thermometers and show how they fit into this theoretical framework and why they may require different optimizations and figures of merit. Most of this discussion is applicable also to power detectors, or bolometers, where the detector time constants may be short compared to variations in the incident signal power.

  5. The CLAS Forward Electromagnetic Calorimeter

    SciTech Connect

    M. Amarian; Geram Asryan; Kevin Beard; Will Brooks; Volker Burkert; Tom Carstens; Alan Coleman; Raphael Demirchyan; Yuri Efremenko; Hovanes Egiyan; Kim Egiyan; Herb Funsten; Vladimir Gavrilov; Kevin L. Giovanetti; R.M. Marshall; Berhard Mecking; R.C. Minehart; H. Mkrtchan; Mavrik Ohandjanyan; Youri Sharabian; L.C. Smith; Stepan Stepanyan; W.A. Stephens; T.Y. Tung; Carl Zorn

    2001-05-01

    The CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab utilizes six iron-free superconducting coils to provide an approximately toroidal magnetic field. The six sectors are instrumented individually to form six independent spectrometers. The forward region (8deg < (theta) < 45deg) of each sector is equipped with a lead-scintillator electromagnetic sampling calorimeter (EC), 16 radiation lengths thick, using a novel triangular geometry with stereo readout. With its good energy and position resolution, the EC is used to provide the primary electron trigger for CLAS. It is also used to reject pions, reconstruct pi-0 and eta decays and detect neutrons, This paper treats the design, construction and performance of the calorimeter.

  6. An elevated temperature titration calorimeter

    SciTech Connect

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

    1991-06-01

    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.

  7. Eigenstates in 2Dimensional Penrose Tiling

    Microsoft Academic Search

    Hirokazu Tsunetsugu; Takeo Fujiwara; Kazuo Ueda; Tetsuji Tokihiro

    1986-01-01

    We find a systematic procedure constructing the 2D and 3D ``periodic'' Penrose tilings, which tend to the infinite Penrose tilings. The electronic states in the 2D Penrose tiling are studied by using this sequence. We observe that the spectral measure is singular continuous in the limit of the infinite size. Most of eigenstates are critical, i.e. neither extended nor localized.

  8. Rugged calorimeter with a fast rise time

    SciTech Connect

    McMurtry, W.M.; Dolce, S.R.

    1980-01-01

    An intrinsic 1-mil-thick gold foil calorimeter has been developed which rises to 95% of the energy deposited in less than 2 microseconds. This calorimeter is very rugged, and can withstand rough handling without damage. The time constant is long, in the millisecond range, because of its unique construction. Use of this calorimeter has produced 100% data recovery, and agreement with true deposition to less than 10%.

  9. Divisible tilings in the HyperbolicDivisible tilings in the Hyperbolic S. Allen Broughton

    E-print Network

    Broughton, S. Allen

    ) #12;4 (2,4,4)(2,4,4) --tiling of the torustiling of the torus #12;5 Kaleidoscopic Tiling of the Plane:Kaleidoscopic gaps and overlaps" · Kaleidoscopic: Symmetric via reflections in edges. · Geodesic edges extend to lines in the tiling · Kaleidoscopic polygons if and only angles of the form where n is an integer n #12

  10. Tetromino tilings and the Tutte polynomial

    NASA Astrophysics Data System (ADS)

    Lykke Jacobsen, Jesper

    2007-02-01

    We consider tiling rectangles of size 4m × 4n by T-shaped tetrominoes. Each tile is assigned a weight that depends on its orientation and position on the lattice. For a particular choice of the weights, the generating function of tilings is shown to be the evaluation of the multivariate Tutte polynomial ZG(Q, v) (known also to physicists as the partition function of the Q-state Potts model) on an (m - 1) × (n - 1) rectangle G, where the parameter Q and the edge weights v can take arbitrary values depending on the tile weights.

  11. Multilayer Impregnated Fibrous Thermal Insulation Tiles

    NASA Technical Reports Server (NTRS)

    Tran, Huy K.; Rasky, Daniel J.; Szalai, Christine e.; Hsu, Ming-ta; Carroll, Joseph A.

    2007-01-01

    The term "secondary polymer layered impregnated tile" ("SPLIT") denotes a type of ablative composite-material thermal- insulation tiles having engineered, spatially non-uniform compositions. The term "secondary" refers to the fact that each tile contains at least two polymer layers wherein endothermic reactions absorb considerable amounts of heat, thereby helping to prevent overheating of an underlying structure. These tiles were invented to afford lighter-weight alternatives to the reusable thermal-insulation materials heretofore variously used or considered for use in protecting the space shuttles and other spacecraft from intense atmospheric-entry heating.

  12. Global Swath and Gridded Data Tiling

    NASA Technical Reports Server (NTRS)

    Thompson, Charles K.

    2012-01-01

    This software generates cylindrically projected tiles of swath-based or gridded satellite data for the purpose of dynamically generating high-resolution global images covering various time periods, scaling ranges, and colors called "tiles." It reconstructs a global image given a set of tiles covering a particular time range, scaling values, and a color table. The program is configurable in terms of tile size, spatial resolution, format of input data, location of input data (local or distributed), number of processes run in parallel, and data conditioning.

  13. Fibonacci words, hyperbolic tilings and grossone

    NASA Astrophysics Data System (ADS)

    Margenstern, Maurice

    2015-04-01

    In this paper, we study the contribution of the theory of grossone to the study of infinite Fibonacci words, combining this tool with the help of a particular tiling of the hyperbolic plane: the tiling { 7, 3 } , called the heptagrid. With the help of the numeral system based on grossone, we obtain a richer family of infinite Fibonacci words compared with the traditional approach.

  14. Water Detection and Removal From Shuttle Tiles

    Microsoft Academic Search

    Robert C. Youngquist

    2003-01-01

    Current methods for detecting and removing water from the Space Shuttle tiles have proved inadequate in cases of excessive water exposure. This paper describes two new tools that are currently being introduced to Shuttle processing to supplement the existing methods. A capacitive device has been developed to augment the IR camera method of detecting water in the tiles and a

  15. Wind-Resistant Filler for Tile Gaps

    NASA Technical Reports Server (NTRS)

    Bellavia, J.; Quigley, I. A.; Callahan, T. S.

    1982-01-01

    Filler developed for gaps between insulating tiles on Space Shuttle finds application in industries that use tiles for thermal or environmental protection. Filler consists of tight-fitting ceramic tubes and fibrous alumina. Combination resists high wind loads while providing requisite heat protection. Quartz-thread stitching holds envelope together.

  16. Optimal Partial Tiling of Manhattan Polyominoes

    E-print Network

    Optimal Partial Tiling of Manhattan Polyominoes Olivier Bodini and J´er´emie Lumbroso LIP6, UMR problem. We have worked on a special case, the tiling of Manhattan polyominoes with dominoes, for which we on the Manhattan class of polyominoes (see figure 1). Supported by ANR contract GAMMA, "G´en´eration Al

  17. A comparison of tiled and overlapping windows

    Microsoft Academic Search

    Sara A. Bly; Jarrett K. Rosenberg

    1986-01-01

    It is widely believed that overlapping windows are preferable to tiled (non-overlapping) ones, but there is very little research to support that belief. An analysis of the basic characteristics of windowing regimes predicts that there are, in fact, situations where overlapping windows are inferior to tiled. An experiment to test this prediction verified that there are indeed tasks and users

  18. A ROOFING TILE FOR NATURAL COOLING

    E-print Network

    SUNGUARD: A ROOFING TILE FOR NATURAL COOLING Prepared For: California Energy Commission Energy (FAR) SUNGUARD: A ROOFING TILE FOR NATURAL COOLING EISG AWARDEE PowerLight Corporation 2954 San Pablo,000 for promising proof-of-concept energy research. PIER funding efforts are focused on the following six RD

  19. Geometric and algebraic properties of polyomino tilings

    E-print Network

    Korn, Michael Robert, 1978-

    2004-01-01

    In this thesis we study tilings of regions on the square grid by polyominoes. A polyomino is any connected shape formed from a union of grid cells, and a tiling of a region is a collection of polyominoes lying in the region ...

  20. A Noncommutative Theory of Penrose Tilings

    Microsoft Academic Search

    Christopher J. Mulvey; Pedro Resende

    2005-01-01

    Considering quantales as generalised noncommutative spaces, we address as an example a quantale Pen based on the Penrose tilings of the plane. We study in general the representations of involutive quantales on those of binary relations, and show that in the case of Pen the algebraically irreducible representations provide a complete classification of the set of Penrose tilings from which

  1. The Symplectic Geometry of Penrose Rhombus Tilings

    Microsoft Academic Search

    Fiammetta Battaglia; Elisa Prato

    2007-01-01

    The purpose of this article is to view Penrose rhombus tilings from the perspective of symplectic geometry. We show that each thick rhombus in such a tiling can be naturally associated to a highly singular 4-dimensional compact symplectic space, while each thin rhombus can be associated to another such space; both spaces are invariant under the Hamiltonian action of a

  2. A noncommutative theory of Penrose tilings

    Microsoft Academic Search

    Christopher J. Mulvey; Pedro Resende

    2003-01-01

    Considering quantales as generalised noncommutative spaces, we address as an example a quantale Pen based on the Penrose tilings of the plane. We study in general the representations of involutive quantales on those of binary relations, and show that in the case of Pen the algebraically irreducible representations provide a complete classification of the set of Penrose tilings from which

  3. Packing, tiling, and covering with tetrahedra

    Microsoft Academic Search

    J. H. Conway; S. Torquato

    2006-01-01

    It is well known that three-dimensional Euclidean space cannot be tiled by regular tetrahedra. But how well can we do? In this work, we give several constructions that may answer the various senses of this question. In so doing, we provide some solutions to packing, tiling, and covering problems of tetrahedra. Our results suggest that the regular tetrahedron may not

  4. Tiling space and slabs with acute tetrahedra

    Microsoft Academic Search

    David Eppstein; John M. Sullivan; Alper Üngör

    2004-01-01

    We show it is possible to tile three-dimensional space using only tetrahedra with acute dihedral angles. We present several constructions to achieve this, including one in which all dihedral angles are less than 74.21°, and another which tiles a slab in space.

  5. Tiling space and slabs with acute tetrahedra

    Microsoft Academic Search

    David Eppstein; John M. Sullivan; Alper Üngör

    2003-01-01

    We show it is possible to tile three-dimensional space using only tetrahedra with acute dihedral angles. We present several constructions to achieve this, including one in which all dihedral angles are less than 77.08?, and another which tiles a slab in space.

  6. The H 1 liquid argon calorimeter system

    Microsoft Academic Search

    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

    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

  7. Redesigning the rotating-bomb combustion calorimeter

    Microsoft Academic Search

    Henoc Flores; Juan Mentado; Patricia Amador; Luis Alfonso Torres; Myriam Campos; Aarón Rojas

    2006-01-01

    In order to obtain reliable data of the standard enthalpy of combustion of compounds containing sulfur or halogen atoms, a new calorimetric rotating-bomb system has been set up. Around a platinum lining Parr 1004 C combustion bomb, an isoperibolic calorimeter has been designed, constructed and tested. The calorimeter was calibrated by using standard benzoic acid and the resulting equivalent in

  8. Curvelet transform with adaptive tiling

    NASA Astrophysics Data System (ADS)

    Al-Marzouqi, Hasan; AlRegib, Ghassan

    2012-03-01

    The curvelet transform is a recently introduced non-adaptive multi-scale transform that have gained popularity in the image processing field. In this paper, we study the effect of customized tiling of frequency content in the curvelet transform. Specifically, we investigate the effect of the size of the coarsest level and its relationship to denoising performance. Based on the observed behavior, we introduce an algorithm to automatically choose the optimal number of decompositions. Its performance shows a clear advantage, in denoising applications, when compared to default curvelet decomposition. We also examine how denoising is affected by varying the number of divisions per scale.

  9. Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector

    E-print Network

    Taylor, Frank E.

    An updated search is performed for gluino, top squark, or bottom squark R-hadrons that have come to rest within the ATLAS calorimeter, and decay at some later time to hadronic jets and a neutralino, using 5.0 and ...

  10. Status of the ATLAS Liquid Argon Calorimeter and its Performance after Three Years of LHC Operation

    NASA Astrophysics Data System (ADS)

    Lampl, W.

    2014-06-01

    The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider(LHC) at CERN. Liquid argon sampling calorimeters are used for all electromagnetic calorimetry covering the pseudo-rapidity region up to 3.2, as well as for hadron calorimetry in the range 1.5-4.9. The electromagnetic calorimeters use lead as passive material and are characterised by an accordion geometry that allows a fast and uniform azimuthal response without any gap. Copper and tungsten were chosen as passive material for the hadron calorimetry; whereas a classic plate geometry was adopted at large polar angles, an innovative one based on cylindrical electrodes with thin argon gaps was designed for the coverage at low angles, where the particles flow is higher. All detectors are housed in three cryostats kept at approximately 89 K. After installation in 2004-2006, the calorimeters were extensively commissioned over the three-year period prior to first collisions in 2009, using cosmic rays and single LHC beams. Since then, around 27 fb-1 of data have been collected at centre of mass energies of 7-8 TeV. During all these stages, the calorimeter has been operating almost optimally, with performance very close to specifications. The talk will cover all aspects of these first years of operation, including the calibration efforts and the data quality assessment procedure. The excellent performance achieved will also be briefly reviewed, especially in the context of the recently announced discovery of the Higgs boson.

  11. Performance of the AMS-02 Electromagnetic Calorimeter in Space

    NASA Astrophysics Data System (ADS)

    Gallucci, G.; AMS-02 ECAL group

    2015-02-01

    AMS-02(Alpha Magnetic Spectrometer) is an high energy particle detector developed to operate on the International Space Station. AMS-02 was installed on ISS on May 2011 and is expected to operate for 10-20 years collecting about 160-320 billions of events. The main goals of the experiment are the detection of primordial antimatter and dark matter by studying spectra and flux of different cosmic ray components (protons, electrons, nuclei, positrons, antiprotons, gamma rays, etc) in the high energy range (1-2000 GeV). Identification of electrons, positrons and photons is provided by the Electromagnetic Calorimeter (ECAL), a fine grained lead-scintillating fibers sampling calorimeter that allows for a precise three-dimensional imaging of the longitudinal and lateral shower development. It provides an excellent reconstruction of electromagnetic shower energy and a highly efficient rejection of the hadronic background. Thanks to the 3D shower reconstruction capability, ECAL allows a stand-alone determination of the incoming particle direction, with unprecedented angular resolution. As a result, ECAL is able to identify high energy photons coming from galactic or extragalactic sources.

  12. Results from an iron-proportional tube calorimeter prototype.

    SciTech Connect

    Schoessow, P.

    1998-02-03

    We have studied the energy resolution of a prototype gas tracking calorimeter in a test beam at Fermilab as part of the detector development program for the MINOS long baseline neutrino oscillation experiment. The calorimeter consisted of 25 layers of 1.5 inch thick steel plates interleaved with planes of aluminum proportional tubes. The tube cells are square, with 0.9 cm edges and open tops. Cathode strips were used for read out transverse to the wire cells. The tubes operated with a nonflammable gas mixture of 88% CO{sub 2}, 9.5% isobutane and 2.5% argon which gave an operating range of >500 V (limited by the electronics). We read out the wire signals on the tubes and in some configurations the cathode stripe as well. We studied positrons, pions and muons over a momentum range of 2.5-30 GeV/c and achieved energy resolutions of about 40%/{radical}E for EM and 71%/{radical}E for hadronic showers.

  13. Results of 2007 test beam of AMS-02 Electromagnetic Calorimeter

    NASA Astrophysics Data System (ADS)

    Falco, Stefano Di

    2010-01-01

    The AMS-02 experiment will be delivered by the Space Shuttle Discovery to the ISS in summer 2010. The main goals of the experiment are search for antimatter and dark matter, high precision measurement of charged cosmic ray spectra and fluxes and 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 energy and to discriminate electromagnetic showers from hadronic cascades. ECAL is based on a lead/scintillating fiber sandwich, providing a 3D imaging reconstruction of the showers. The electronics equipping the detector has low power consumption, low noise, large dynamic range readout and full double redundancy. The calorimeter successfully got through several space qualification tests concerning the mechanical and thermal stability, the electromagnetic compatibility and radiation hardness. The ECAL Flight Model was calibrated during Summer 2007 in a test beam at CERN, using 6-250 GeV electron and proton beams: angular and energy resolutions, obtained from these data, are reported.

  14. gFEX, the ATLAS Calorimeter Global Feature Extractor

    E-print Network

    Takai, Helio; The ATLAS collaboration; Chen, Hucheng

    2015-01-01

    The global feature extractor (gFEX) is a component of the Level-1 Calorimeter trigger Phase-I upgrade for the ATLAS experiment. It is intended to identify patterns of energy associated with the hadronic decays of high momentum Higgs, W, & Z bosons, top quarks, and exotic particles in real time at the LHC crossing rate. The single processor board will be implemented as a fast reconfigurable processor based on four large FPGAs. The board will receive coarse-granularity information from all the ATLAS calorimeters on 264 optical fibers with the data transferred at the 40 MHz LHC clock frequency. The gFEX will be controlled by a single system-on-chip processor, ZYNQ, that will be used to configure FPGAs, monitor board health, and interface to external signals. Although the board is being designed specifically for the ATLAS experiment, it is sufficiently generic that it could be used for fast data processing at other HEP or NP experiments. We will present the design of the gFEX board and discuss how it is being...

  15. Exotic hadrons at hadron colliders

    E-print Network

    Ye Chen

    2014-09-01

    In this proceeding, an overview of the recent progress of the exotic hadrons studies at hadron colliders is presented, including the experimental measurement results from CMS, LHCb, CDF and D0. The talk covers the physics properties study of X(3872); the search for Y(4140) state etc; the recent result of Z(4430); and also the extended study to bottomonium sector.

  16. Cube Tilings of R n and Nonlinear Codes

    E-print Network

    Shor, Peter W.

    Cube Tilings of R n and Nonlinear Codes Jeffrey C. Lagarias Peter W. Shor AT&T Bell Laboratories cubes are constructed. These tilings are specializations of certain families of nonlinear codes over GF(2). These cube-tilings provide building blocks for the construction of cube-tilings such that no two

  17. Augmenting Loop Tiling with Data Alignment for Improved Cache Performance

    Microsoft Academic Search

    Preeti Ranjan Panda; Hiroshi Nakamura; Nikil D. Dutt; Alexandru Nicolau

    1999-01-01

    Loop blocking (tiling) is a well-known compiler optimization that helps improve cache performance by dividing the loop iteration space into smaller blocks (tiles); reuse of array elements within each tile is maximized by ensuring that the working set for the tile fits into the data cache. Padding is a data alignment technique that involves the insertion of dummy elements into

  18. Solar-energy treatment of ceramic tiles

    NASA Astrophysics Data System (ADS)

    Harris, J. N.; Clayton, M. E.

    1981-12-01

    The 400 kW Advanced Components Test Facility was used to provide a concentrated source of solar energy for firing ceramic wall tile. A domed top cylindrical cavity with a white refractory fiber lining provided diffuse reflection of the concentrated solar beam directly onto the upper surface of the unfired wall tile. The tile were placed directly on the cavity floor in a circular pattern, centered at 450 intervals so that eight tile could be fired at one time. The tile and cavity walls were instrumented with thermocouples, and pyrometric cones were used to determine temperature distribution within the cavity. The glazed and unglazed solar fired titles were tested for flatness, modulus of rupture, water absorption, porosity, bulk density, apparent specific gravity, percent linear thermal expansion and crystalline phases present in the fired bodies. The major problems encountered are: cracking by thermal shock, and uneven shrinkage and glaze maturity across individual tile. The cavity failed to provide even heating at all eight tile positions.

  19. Hadronic Interactions

    E-print Network

    Takeshi Yamazaki

    2015-03-30

    Understanding hadronic interactions is crucial for investigating the properties of unstable hadrons, since measuring physical quantities for unstable hadrons including the resonance mass and decay width requires simultaneous calculations of final scattering states. Recent studies of hadronic scatterings and decays are reviewed from this point of view. The nuceon-nucleon and multi-nucleon interactions are very important to understand the formation of nucleus from the first principle of QCD. These interactions have been studied mainly by two methods, due originally to L\\"uscher and to HALQCD. The results obtained from the two methods are compared in three channels, $I=2$ two-pion, H-dibaryon, and two-nucleon channels. So far the results from the two methods for the two-nucleon channels are different even at the level of the presence or absence of bound states. We then discuss possible uncertainties in each method. Recent results on the binding energy for helium nuclei are also reviewed.

  20. Fibrous-Ceramic/Aerogel Composite Insulating Tiles

    NASA Technical Reports Server (NTRS)

    White, Susan M.; Rasky, Daniel J.

    2004-01-01

    Fibrous-ceramic/aerogel composite tiles have been invented to afford combinations of thermal-insulation and mechanical properties superior to those attainable by making tiles of fibrous ceramics alone or aerogels alone. These lightweight tiles can be tailored to a variety of applications that range from insulating cryogenic tanks to protecting spacecraft against re-entry heating. The advantages and disadvantages of fibrous ceramics and aerogels can be summarized as follows: Tiles made of ceramic fibers are known for mechanical strength, toughness, and machinability. Fibrous ceramic tiles are highly effective as thermal insulators in a vacuum. However, undesirably, the porosity of these materials makes them permeable by gases, so that in the presence of air or other gases, convection and gas-phase conduction contribute to the effective thermal conductivity of the tiles. Other disadvantages of the porosity and permeability of fibrous ceramic tiles arise because gases (e.g., water vapor or cryogenic gases) can condense in pores. This condensation contributes to weight, and in the case of cryogenic systems, the heat of condensation undesirably adds to the heat flowing to the objects that one seeks to keep cold. Moreover, there is a risk of explosion associated with vaporization of previously condensed gas upon reheating. Aerogels offer low permeability, low density, and low thermal conductivity, but are mechanically fragile. The basic idea of the present invention is to exploit the best features of fibrous ceramic tiles and aerogels. In a composite tile according to the invention, the fibrous ceramic serves as a matrix that mechanically supports the aerogel, while the aerogel serves as a low-conductivity, low-permeability filling that closes what would otherwise be the open pores of the fibrous ceramic. Because the aerogel eliminates or at least suppresses permeation by gas, gas-phase conduction, and convection, the thermal conductivity of such a composite even at normal atmospheric pressure is not much greater than that of the fibrous ceramic alone in a vacuum.

  1. Seamless stitching of tile scan microscope images.

    PubMed

    Legesse, F B; Chernavskaia, O; Heuke, S; Bocklitz, T; Meyer, T; Popp, J; Heintzmann, R

    2015-06-01

    For diagnostic purposes, optical imaging techniques need to obtain high-resolution images of extended biological specimens in reasonable time. The field of view of an objective lens, however, is often smaller than the sample size. To image the whole sample, laser scanning microscopes acquire tile scans that are stitched into larger mosaics. The appearance of such image mosaics is affected by visible edge artefacts that arise from various optical aberrations which manifest in grey level jumps across tile boundaries. In this contribution, a technique for stitching tiles into a seamless mosaic is presented. The stitching algorithm operates by equilibrating neighbouring edges and forcing the brightness at corners to a common value. The corrected image mosaics appear to be free from stitching artefacts and are, therefore, suited for further image analysis procedures. The contribution presents a novel method to seamlessly stitch tiles captured by a laser scanning microscope into a large mosaic. The motivation for the work is the failure of currently existing methods for stitching nonlinear, multimodal images captured by our microscopic setups. Our method eliminates the visible edge artefacts that appear between neighbouring tiles by taking into account the overall illumination differences among tiles in such mosaics. The algorithm first corrects the nonuniform brightness that exists within each of the tiles. It then compensates for grey level differences across tile boundaries by equilibrating neighbouring edges and forcing the brightness at the corners to a common value. After these artefacts have been removed further image analysis procedures can be applied on the microscopic images. Even though the solution presented here is tailored for the aforementioned specific case, it could be easily adapted to other contexts where image tiles are assembled into mosaics such as in astronomical or satellite photos. PMID:25787148

  2. HEIGHT FUNCTION ON DOMINO TILINGS We first define the height function on a domino tiling (as done in [1])

    E-print Network

    Lei, Guo-Ying "Helen"

    HEIGHT FUNCTION ON DOMINO TILINGS 1. Summary We first define the height function on a domino tiling() Iv (f(z))dz. 2.1 The Height Function. Given a domino tiling on the usual setup of black and white squares (checkerboard tiling), the height function h is a function from the ver- tices of the domino

  3. Higher genus Soccer Balls andHigher genus Soccer Balls and Kaleidoscopic Tilings in theKaleidoscopic Tilings in the

    E-print Network

    Broughton, S. Allen

    1 Higher genus Soccer Balls andHigher genus Soccer Balls and Kaleidoscopic Tilings in the;2 OutlineOutline · Talk 1 The relation between higher genus soccer balls and the kaleidoscopic tilings with undergraduates #12;3 First Talk: Soccer Ball and TilingsFirst Talk: Soccer Ball and Tilings · Analyze soccer ball

  4. Aerogel: Tile Composites Toughen a Brittle Superinsulation

    NASA Technical Reports Server (NTRS)

    White, Susan; Rasky, Daniel; Arnold, James O. (Technical Monitor)

    1998-01-01

    Pure aerogels, though familiar in the laboratory for decades as exotic lightweight insulators with unusual physical properties, have had limited industrial applications due to their low strength and high brittleness. Composites formed of aerogels and the ceramic fiber matrices like those used as space shuttle tiles bypass the fragility of pure aerogels and can enhance the performance of space shuttle tiles in their harsh operating environment. Using a layer of aerogel embedded in a tile may open up a wide range of applications where thermal insulation, gas convection control and mechanical strength matter.

  5. Compressing random microstructures via stochastic Wang tilings.

    PubMed

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

    2012-10-01

    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. PMID:23214516

  6. Performance of the ATLAS Liquid Argon Calorimeter after three years of LHC operation and plans for a future upgrade

    NASA Astrophysics Data System (ADS)

    Strizenec, P.

    2014-09-01

    The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider (LHC) at CERN. Liquid Argon sampling calorimeters are used for all electromagnetic calorimetry covering the pseudorapidity region up to 3.2, as well as for hadronic calorimetry in the range 1.4-4.9. The electromagnetic calorimeters use lead as passive material and are characterized by an accordion geometry that allows a fast and uniform azimuthal response. Copper and tungsten were chosen as passive material for the hadronic calorimetry; whereas a parallel plate geometry was adopted at large polar angles, an innovative one based on cylindrical electrodes with thin argon gaps was designed for the coverage at low angles, where the particles flow is higher. All detectors are housed in three cryostats kept at 88.5 K. After installation in 2004-2006, the calorimeters were extensively commissioned over the three years period prior to first collisions in 2009, using cosmic rays and single LHC beams. Since then, around 27 fb-1 of data have been collected at a unprecedented center of mass energies between 7 TeV and 8 TeV. During all these stages, the calorimeter and its electronics have been operating with performances very close to the specification ones. After 2019, the instantaneous luminosity will reach 2-3 × 1034 cm-2s-1, well above the luminosity for which the calorimeter was designed. In order to preserve its triggering capabilities, the detector will be upgraded with a new fully digital trigger system with a refined granularity. In 2023, the instantaneous luminosity will ultimately reach 5-7 × 1034 cm-2s-1, requiring a complete replacement of the readout electronics. Moreover, with an increased particle flux, several phenomena (liquid argon boiling, space charge effects...) will affect the performance of the forward calorimeter (FCal). A replacement with a new FCal with smaller LAr gaps or a new calorimeter module are considered. The performance of these new calorimeters is being studied in highest intensity particle beams. This contribution covers all aspects of the first three years of operation. The excellent performance achieved is especially detailed in the context of the discovery of the Higgs boson announced in July 2012. The future plans to preserve this performance until the end of the LHC program are also presented.

  7. Penrose Tilings as Jammed Solids

    E-print Network

    Olaf Stenull; T. C. Lubensky

    2014-06-24

    Penrose tilings form lattices, exhibiting 5-fold symmetry and isotropic elasticity, with inhomogeneous coordination much like that of the force networks in jammed systems. Under periodic boundary conditions, their average coordination is exactly four. We study the elastic and vibrational properties of rational approximants to these lattices as a function of unit-cell size $N_S$ and find that they have of order $\\sqrt{N_S}$ zero modes and states of self stress and yet all their elastic moduli vanish. In their generic form obtained by randomizing site positions, their elastic and vibrational properties are similar to those of particulate systems at jamming with a nonzero bulk modulus, vanishing shear modulus, and a flat density of states.

  8. Electromagnetic Calorimetry at Hadronic Colliders:. Status and Perspectives

    NASA Astrophysics Data System (ADS)

    Camporesi, Tiziano

    2004-08-01

    In this paper the electromagnetic calorimeters of the large LHC experiments, CMS and ATLAS, will be briefly described as representatives of today's state of the art. Accent will be put on the features where these calorimeters have been innovative and on the challenges that the goal of the detection of a narrow resonance on top of a huge background (like a light Higgs boson decaying into ??) poses on the practical side. The implication of an LHC upgrade (SLHC) are discussed. Finally some speculation will be put forward on the possible electromagnetic calorimeter and detector structure for a future Very Large Hadron Collider (VLHC) with instantaneous luminosities in excess of 1035 cm-2s-1 and center of mass energies exceeding 100 TeV.

  9. Experimental aerodynamic heating to simulated Shuttle tiles

    NASA Technical Reports Server (NTRS)

    Avery, D. E.; Kerr, P. A.; Wieting, A. R.

    1983-01-01

    The heat transfer to simulated Shuttle thermal protection system tiles was investigated experimentally using a highly instrumented metallic thin wall tile arranged with other metal tiles in a staggered tile array. Cold-wall heating rate data for laminar and turbulent flow were obtained in the Langley 8-Foot High-Temperature Tunnel at a nominal Mach number of 7, a nominal total temperature of 3300 deg R, free-stream unit Reynolds number from 340,000 to 2,200,000 per foot, and free-stream dynamic pressure of 1.8 to 9.1 psia. Experimental data are presented to illustrate the effects of flow angularity and gap width on both local peak heating and overall heating loads.

  10. Experimental aerodynamic heating to simulated shuttle tiles

    NASA Technical Reports Server (NTRS)

    Avery, D. E.; Kerr, P. A.; Wieting, A. R.

    1983-01-01

    The heat transfer to simulated shuttle thermal protection system tiles was investigated experimentally using a highly instrumented metallic thin wall tile arranged with other metal tiles in a staggered tile array. Cold-wall heating rate data for laminar and turbulent flow were obtained in the Langley 8-foot high temperature tunnel at a nominal Mach number of 7, a nominal total temperature of 3300 R, free-stream unit Reynolds number from 3.4 x 10 to the 5th power to 2.2 x 10 to the 6th power per foot, and free-stream dynamic pressure of 1.8 psia to 9.1 psia. Experimental data are presented to illustrate the effects of flow angularity and gap width on both local peak heating and overall heating loads.

  11. A family of ternary decagonal tilings

    NASA Astrophysics Data System (ADS)

    Fujita, Nobuhisa

    2010-04-01

    A new family of decagonal quasiperiodic tilings are constructed by the use of generalized point substitution processes, which is a new substitution formalism developed by the author [N. Fujita, Acta Cryst. A 65, 342 (2009)]. These tilings are composed of three prototiles: an acute rhombus, a regular pentagon and a barrel shaped hexagon. In the perpendicular space, these tilings have windows with fractal boundaries, and the windows are analytically derived as the fixed sets of the conjugate maps associated with the relevant substitution rules. It is shown that the family contains an infinite number of local isomorphism classes which can be grouped into several symmetry classes (e.g., C10, D5, etc.). The member tilings are transformed into one another through collective simpleton flips, which are associated with the reorganization in the window boundaries.

  12. Radioactivity in zircon and building tiles

    SciTech Connect

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

    1997-08-01

    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.

  13. Manufacture of ceramic tiles from fly ash

    DOEpatents

    Hnat, James G. (Collegeville, PA); Mathur, Akshay (Tampa, FL); Simpson, James C. (Perkiomenville, PA)

    1999-01-01

    The present invention relates to a process for forming glass-ceramic tiles. Fly ash containing organic material, metal contaminants, and glass forming materials is oxidized under conditions effective to combust the organic material and partially oxidize the metallic contaminants and the glass forming materials. The oxidized glass forming materials are vitrified to form a glass melt. This glass melt is then formed into tiles containing metallic contaminants.

  14. The Symplectic Geometry of Penrose Rhombus Tilings

    Microsoft Academic Search

    Fiammetta Battaglia; Elisa Prato

    2008-01-01

    The purpose of this article is to view Penrose rhombus tilings from the perspective of symplectic geometry. We show that each thick rhombus in such a tiling can be naturally associated to a highly singular 4-dimensional compact symplectic space $M_R$, while each thin rhombus can be associated to another such space $M_r$; both spaces are invariant under the Hamiltonian action

  15. The experiment 705 electromagnetic shower calorimeter

    Microsoft Academic Search

    L. Antoniazzi; M. Arenton; Z. Cao; T. Y. Chen; S. Conetti; B. Cox; S. Delchamps; L. Fortney; K. Guffey; M. Haire; M. He; P. Ioannou; C. M. Jenkins; D. J. Judd; C. Kourkoumelis; A. Manousakis-Katsikakis; J. Kuzminski; T. Lecompte; A. Marchionni; P. O. Mazur; C. T. Murphy; P. Pramantiotis; R. Rameika; L. Resvanis; M. Rosati; J. Rosen; C. H. Shen; Q. Shen; A. Simard; R. Smith; L. Spiegel; D. Stairs; Y. Tan; R. J. Tesarek; T. Turkington; L. Turnbull; F. Turkot; S. Tzamarias; G. Voulgaris; D. E. Wagoner; C. Wang; J. Weckel; W. Yang; N. Yao; N. Zhang; X. Zhang; G. Zioulas; B. Zou

    1993-01-01

    Experiment 705 at Fermi National Accelerator Laboratory has designed, built, and operated a large acceptance, highly segmented electromagnetic shower calorimeter using SF5 lead glass, SCG1-C scintillating glass, and two types of gas-based fine-grained hodoscopes. The calorimeter was used to reconstruct photons and electrons with energies ranging from a few GeV\\/c2 to over 100 GeV\\/c2 in 300 GeV\\/c pion and proton

  16. Novel method for detecting the hadronic component of extensive air showers

    NASA Astrophysics Data System (ADS)

    Gromushkin, D. M.; Volchenko, V. I.; Petrukhin, A. A.; Stenkin, Yu. V.; Stepanov, V. I.; Shchegolev, O. B.; Yashin, I. I.

    2015-05-01

    A novel method for studying the hadronic component of extensive air showers (EAS) is proposed. The method is based on recording thermal neutrons accompanying EAS with en-detectors that are sensitive to two EAS components: an electromagnetic (e) component and a hadron component in the form of neutrons (n). In contrast to hadron calorimeters used in some arrays, the proposed method makes it possible to record the hadronic component over the whole area of the array. The efficiency of a prototype array that consists of 32 en-detectors was tested for a long time, and some parameters of the neutron EAS component were determined.

  17. Quasicrystalline tilings with nematic colloidal platelets.

    PubMed

    Dontabhaktuni, Jayasri; Ravnik, Miha; Žumer, Slobodan

    2014-02-18

    Complex nematic fluids have the remarkable capability for self-assembling regular colloidal structures of various symmetries and dimensionality according to their micromolecular orientational order. Colloidal chains, clusters, and crystals were demonstrated recently, exhibiting soft-matter functionalities of robust binding, spontaneous chiral symmetry breaking, entanglement, shape-driven and topological driven assembly, and even memory imprinting. However, no quasicrystalline structures were found. Here, we show with numerical modeling that quasicrystalline colloidal lattices can be achieved in the form of original Penrose P1 tiling by using pentagonal colloidal platelets in layers of nematic liquid crystals. The tilings are energetically stabilized with binding energies up to 2500 kBT for micrometer-sized platelets and further allow for hierarchical substitution tiling, i.e., hierarchical pentagulation. Quasicrystalline structures are constructed bottom-up by assembling the boat, rhombus, and star maximum density clusters, thus avoiding other (nonquasicrystalline) stable or metastable configurations of platelets. Central to our design of the quasicrystalline tilings is the symmetry breaking imposed by the platelet shape and the surface anchoring conditions at the colloidal platelets, which are misaligning and asymmetric over two perpendicular mirror planes. Finally, the design of the quasicrystalline tilings as platelets in nematic liquid crystals is inherently capable of a continuous variety of length scales of the tiling, ranging over three orders of magnitude in the typical length (from ~ 10 nm to ~ 10 ?m), which could allow for the design of quasicrystalline photonics at multiple frequency ranges. PMID:24550269

  18. Symmetry groups associated with tilings on a flat torus.

    PubMed

    Loyola, Mark L; De Las Peñas, Ma Louise Antonette N; Estrada, Grace M; Santoso, Eko Budi

    2015-01-01

    This work investigates symmetry and color symmetry properties of Kepler, Heesch and Laves tilings embedded on a flat torus and their geometric realizations as tilings on a round torus in Euclidean 3-space. The symmetry group of the tiling on the round torus is determined by analyzing relevant symmetries of the planar tiling that are transformed to axial symmetries of the three-dimensional tiling. The focus on studying tilings on a round torus is motivated by applications in the geometric modeling of nanotori and the determination of their symmetry groups. PMID:25537393

  19. Tritium calorimeter setup and operation

    SciTech Connect

    Rodgers, David E.

    2002-12-17

    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.

  20. Progress in hadronic physics modelling in Geant4

    NASA Astrophysics Data System (ADS)

    Apostolakis, John; Folger, Gunter; Grichine, Vladimir; Heikkinen, Aatos; Howard, Alexander; Ivanchenko, Vladimir; Kaitaniemi, Pekka; Koi, Tatsumi; Kosov, Mikhail; Quesada, Jose Manuel; Ribon, Alberto; Uzhinskiy, Vladimir; Wright, Dennis

    2009-04-01

    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.

  1. Fractal dimension of particle showers measured in a highly granular calorimeter.

    PubMed

    Ruan, Manqi; Jeans, Daniel; Boudry, Vincent; Brient, Jean-Claude; Videau, Henri

    2014-01-10

    We explore the fractal nature of particle showers using Monte Carlo simulation. We define the fractal dimension of showers measured in a high granularity calorimeter designed for a future lepton collider. The shower fractal dimension reveals detailed information of the spatial configuration of the shower. It is found to be characteristic of the type of interaction and highly sensitive to the nature of the incident particle. Using the shower fractal dimension, we demonstrate a particle identification algorithm that can efficiently separate electromagnetic showers, hadronic showers, and nonshowering tracks. We also find a logarithmic dependence of the shower fractal dimension on the particle energy. PMID:24483887

  2. Mechanical and thermal design of the CEBAF Hall a beam calorimeter

    SciTech Connect

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

    2005-05-16

    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 response time. Heat leaks are minimized by mounting the mass in vacuum on glass ceramic mounts. A conduction cooling scheme utilizes an advanced carbon fiber compliant thermal interface material. Transient finite difference and finite element models were developed to estimate heat leaks and thermal response times.

  3. INTERIOR VIEW OF BATHROOM 1. SHOWING ORIGINAL MOSAIC PATTERN TILE ...

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

    INTERIOR VIEW OF BATHROOM 1. SHOWING ORIGINAL MOSAIC PATTERN TILE FLOOR, TILE WAINSCOT AND SHOWER SURROUND, AND CERAMIC ACCESSORIES. VIEW FACING EAST. - Hickam Field, Officers' Housing Type J, 701 Beard Street, Honolulu, Honolulu County, HI

  4. Random and Ordered Phases of Off-Lattice Rhombus Tiles

    NASA Astrophysics Data System (ADS)

    Whitelam, Stephen; Tamblyn, Isaac; Beton, Peter H.; Garrahan, Juan P.

    2012-01-01

    We study the covering of the plane by nonoverlapping rhombus tiles, a problem well studied only in the limiting case of dimer coverings of regular lattices. We go beyond this limit by allowing tiles to take any position and orientation on the plane, to be of irregular shape, and to possess different types of attractive interactions. Using extensive numerical simulations, we show that at large tile densities there is a phase transition from a fluid of rhombus tiles to a solid packing with broken rotational symmetry. We observe self-assembly of broken-symmetry phases, even at low densities, in the presence of attractive tile-tile interactions. Depending on the tile shape and interactions, the solid phase can be random, possessing critical orientational fluctuations, or crystalline. Our results suggest strategies for controlling tiling order in experiments involving “molecular rhombi.”

  5. Random and ordered phases of off-lattice rhombus tiles.

    PubMed

    Whitelam, Stephen; Tamblyn, Isaac; Beton, Peter H; Garrahan, Juan P

    2012-01-20

    We study the covering of the plane by nonoverlapping rhombus tiles, a problem well studied only in the limiting case of dimer coverings of regular lattices. We go beyond this limit by allowing tiles to take any position and orientation on the plane, to be of irregular shape, and to possess different types of attractive interactions. Using extensive numerical simulations, we show that at large tile densities there is a phase transition from a fluid of rhombus tiles to a solid packing with broken rotational symmetry. We observe self-assembly of broken-symmetry phases, even at low densities, in the presence of attractive tile-tile interactions. Depending on the tile shape and interactions, the solid phase can be random, possessing critical orientational fluctuations, or crystalline. Our results suggest strategies for controlling tiling order in experiments involving "molecular rhombi." PMID:22400760

  6. Random and ordered phases of off-lattice rhombus tiles

    NASA Astrophysics Data System (ADS)

    Whitelam, Stephen; Tamblyn, Isaac; Beton, Peter; Garrahan, Juan

    2012-02-01

    We study the covering of the plane by non-overlapping rhombus tiles, a problem well-studied only in the limiting case of dimer coverings of regular lattices. We go beyond this limit by allowing tiles to take any position and orientation on the plane, to be of irregular shape, and to possess different types of attractive interactions. Using extensive numerical simulations we show that at large tile densities there is a phase transition from a fluid of rhombus tiles to a solid packing with broken rotational symmetry. We observe self-assembly of broken-symmetry phases, even at low densities, in the presence of attractive tile-tile interactions. Depending on tile shape and interactions the solid phase can be random, possessing critical orientational fluctuations, or crystalline. Our results suggest strategies for controlling tiling order in experiments involving ``molecular rhombi.''

  7. Fractal Penrose tilings I. Construction and matching rules

    Microsoft Academic Search

    C. Bandt; P. Gummelt

    1997-01-01

    Summary Quasiperiodic tilings of kite-and-dart type, widely used as models for quasicrystals with decagonal symmetry, are constructed by means of somewhat artificial matching rules for the tiles. The proof of aperiodicity uses a self-similarity property, or inflation procedure, which requires drawing auxiliary lines. We introduce a modification of the kite-and-dart tilings which comes very naturally with both properties: the tiles

  8. On-Chip Interconnection Architecture of the Tile Processor

    Microsoft Academic Search

    David Wentzlaff; Patrick Griffin; Henry Hoffmann; Liewei Bao; Bruce Edwards; Carl Ramey; Matthew Mattina; Chyi-Chang Miao; John F. Brown; Anant Agarwal

    2007-01-01

    IMesh, the tile processor architecture's on-chip interconnection network, connects the multicore processor's tiles with five 2D mesh networks, each specialized for a different use. taking advantage of the five networks, the C-based ILIB interconnection library efficiently maps program communication across the on-chip interconnect. the tile processor's first implementation, the tile64, contains 64 cores and can execute 192 billion 32-bit operations

  9. Random-tiling membranes and interfaces.

    NASA Astrophysics Data System (ADS)

    Jari?, Marko V.; Johnson, Steven L.

    1996-03-01

    A random tiling model is introduced to investigate fluctuations and self-diffusion in membranes and interfaces. Certain local tile rearrangements, ``hexons," offer a possibility of a novel mechanism of self-diffusion in these membranes. For a large class of these models, it is proved that any vertex can be transported arbitrarily far by hexons. As an illustration, Penrose tilings are used to construct an explicit membrane model. Then, its flat (low temperature) and rough (high temperature) phases are investigated by means of Monte Carlo simulations. Due to back-stepping, the transport is subdiffusive at short time scales in both phases. At long time scales, the transport is consistent with normal diffusion. The diffusion constant is larger by a factor of three in the rough phase than in the flat phase.

  10. Performance of the CMS Regional Calorimeter Trigger

    E-print Network

    Klabbers, P; Dasu, S; Efron, J; Fobes, R; Gorski, T; Grogg, K; Grothe, M; Lazaridis, C; Leonard, J; Savin, A; Smith, W H; Weinberg, M

    2009-01-01

    The CMS Regional Calorimeter Trigger (RCT) receives eight-bit energies and a data quality bit from the HCAL and ECAL Trigger Primitive Generators (TPGs). The RCT uses these trigger primitives to find e/? candidates and calculate regional calorimeter sums that are sent to the Global Calorimeter Trigger (GCT) for sorting and further processing. The RCT hardware consists of one clock distribution crate and 18 double-sided crates containing custom boards, ASICs, and backplanes. The RCT electronics have been completely installed since 2007. The RCT has been integrated into the CMS Level-1 Trigger chain. Regular runs, triggering on cosmic rays, prepare the CMS detector for the restart of the LHC. During this running, the RCT control is handled centrally by CMS Run Control and Monitor System communicating with the Trigger Supervisor. Online Data Quality Monitoring (DQM) evaluates the performance of the RCT during these runs. Offline DQM allows more detailed studies, including trigger efficiencies. These and other r...

  11. Vacuum-jacketed hydrofluoric acid solution calorimeter

    USGS Publications Warehouse

    Robie, R.A.

    1965-01-01

    A vacuum-jacketed metal calorimeter for determining heats of solution in aqueous HF was constructed. The reaction vessel was made of copper and was heavily gold plated. The calorimeter has a cooling constant of 0.6 cal-deg -1-min-1, approximately 1/4 that of the air-jacketed calorimeters most commonly used with HF. It reaches equilibrium within 10 min after turning off the heater current. Measurements of the heat of solution of reagent grade KCl(-100 mesh dried 2 h at 200??C) at a mole ratio of 1 KCl to 200 H2O gave ??H = 4198??11 cal at 25??C. ?? 1965 The American Institute of Physics.

  12. Calibration and performances of the KLOE calorimeter

    NASA Astrophysics Data System (ADS)

    Ambrosino, F.; Antonelli, A.; Antonelli, M.; Archilli, F.; Bacci, C.; Beltrame, P.; Bencivenni, G.; Bertolucci, S.; Bini, C.; Bloise, C.; Bocchetta, S.; Bossi, F.; Branchini, P.; Campana, P.; Capon, G.; Capussela, T.; Ceradini, F.; Chi, S.; Chiefari, G.; Ciambrone, P.; Crucianelli, F.; De Lucia, E.; De Santis, A.; De Simone, P.; De Zorzi, G.; Denig, A.; Di Domenico, A.; Di Donato, C.; Di Micco, B.; Doria, A.; Dreucci, M.; Felici, G.; Ferrari, A.; Ferrer, M. L.; Fiore, S.; Forti, C.; Franzini, P.; Gatti, C.; Gauzzi, P.; Giovannella, S.; Gorini, E.; Graziani, E.; Kluge, W.; Kulikov, V.; Lacava, F.; Lanfranchi, G.; Lee-Franzini, J.; Leone, D.; Martini, M.; Massarotti, P.; Mei, W.; Meola, S.; Miscetti, S.; Moulson, M.; Müller, S.; Murtas, F.; Napolitano, M.; Nguyen, F.; Palutan, M.; Pasqualucci, E.; Passeri, A.; Patera, V.; Perfetto, F.; Primavera, M.; Santangelo, P.; Saracino, G.; Sciascia, B.; Sciubba, A.; Sibidanov, A.; Spadaro, T.; Testa, M.; Tortora, L.; Valente, P.; Venanzoni, G.; Versaci, R.; Xu, G.

    2009-01-01

    The KLOE experiment uses a fine sampling lead-scintillating fibre calorimeter to measure energy, time and position of neutral and charged particles. The overall detector consists of 88 modules organised in a barrel and two end-caps, for a total granularity of 2440 cells, read-out by photo-multipliers at both fibre ends. The chosen design of a high sampling fraction with the usage of thin lead layers and fast scintillating fibres allows to reach good efficiency for photon energies down to few MeV, good energy resolution and excellent time resolution. The design, calibration and performances of the calorimeter on efficiency, time/position/energy resolution and particle identification is reviewed. The overall calorimeter impact on kaon tagging and on physics results is also presented.

  13. A FIBONACCI TILING OF THE PLANE Charles W. Huegy

    E-print Network

    West, Douglas B.

    . Running head: FIBONACCI TILING AMS codes: 11B39 Keywords: Fibonacci number, tiling, recurrence Completed by engineering considerations and exhibits Fibonacci growth as it expands from the origin. Fibonacci numbers alsoA FIBONACCI TILING OF THE PLANE Charles W. Huegy Polygonics, 2 Mann St., Irvine, CA 92612

  14. DeskAlign: Automaticlly Aligning a Tiled Windows Desktop

    Microsoft Academic Search

    Grant Wallace; Han Chen; Kai Li

    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

  15. Mapping of Tile Drains in Hoagland Watershed for Simulating the

    E-print Network

    Cherkauer, Keith

    in Hoagland watershed from high resolution aerial photographs using image processing techniques. To estimate;10 Automated mapping of tile lines using image processing techniques Final tile lines map Merging of horizontal Purdue University, West Lafayette, IN #12;Outline Introduction Mapping of tile lines using image

  16. 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...

  17. ICWall: a calibrated stereo tiled display from commodity components

    Microsoft Academic Search

    Tom Van Der Schaaf; Desmond Germans; Michal Koutek; Henri E. Bal

    2006-01-01

    Recent developments in the fields of parallel rendering and high resolution tiled displays have made it possible to apply these tech- nologies to build large and scalable stereo displays for use in Vir- tual Reality applications. This paper presents the implementation of a high-resolution stereo tiled display (2x8 tiles), built from low- cost commodity components. Among the problems that arise

  18. Theory of matching rules for the 3-dimensional Penrose tilings

    Microsoft Academic Search

    A. Katz

    1988-01-01

    We consider packings of the two Ammann rhombohedra used for tiling the three dimensional space. We define decorations for the facets of the rhombohedra. Using elementary algebraic topology, we prove that any tiling by these rhombohedra with matching decorations is a quasiperiodic Penrose tiling. The proof does not involve any reference to self similarity.

  19. 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

  20. 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

  1. EPINET: euclidean patterns in non-euclidean tilings

    Microsoft Academic Search

    Vanessa Robins; Stuart Ramsden; Stephen Hyde

    2006-01-01

    We present a method for generating 3D euclidean periodic networks from 2D hyperbolic tilings. We utilize triply-periodic minimal surfaces (TPMS) as a mathematical scaffold to guide this process. These surfaces have an intrinsic hyperbolic geometry as well as an underlying set of discrete hyperbolic symmetries, allowing decoration with tilings of matching symmetry. Hyperbolic tilings of a given symmetry can be

  2. Improving Emittance of High-Temperature Insulating Tile

    NASA Technical Reports Server (NTRS)

    Gzowski, E. R.

    1985-01-01

    Simple addition to ceramic insulating tiles provides backup properties that minimize transfer of heat through tiles when their surfaces become damaged. Addition of 3 percent by weight of 320- or 600-grit silicon carbide powder to ceramic during production results in impregnated tile material that resists overheating. Silicon carbide increases emittance and decreases transmittance of ceramic.

  3. Kinetic tiles: modular construction units for interactive kinetic surfaces

    Microsoft Academic Search

    Hyunjung Kim; Woohun Lee

    2010-01-01

    We propose and demonstrate Kinetic Tiles, modular con-struction units for Interactive Kinetic Surfaces (IKSs). We aimed to design Kinetic Tiles to be accessible and available so that users can construct IKSs easily and rapidly. The components of Kinetic Tiles are inexpensive and easily available. In addition, the use of magnetic force enables the separation of the surface material and actuators

  4. 2.OA Red and Blue Tiles

    NSDL National Science Digital Library

    2012-05-01

    This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: Lin wants to put some red and blue tiles on a wall for decoration. She is thinking about several different patterns of tiles she could create. She want...

  5. Precision Crystal Calorimeters in High Energy Physics

    SciTech Connect

    Ren-Yuan Zhu

    2008-04-02

    Precision crystal calorimeters traditionally play an important role in high energy physics experiments. In the last two decades, it faces a challenge to maintain its precision in a hostile radiation environment. This paper reviews the performance of crystal calorimeters constructed for high energy physics experiments and the progress achieved in understanding crystal’s radiation damage as well as in developing high quality scintillating crystals for particle physics. Potential applications of new generation scintillating crystals of high density and high light yield, such as LSO and LYSO, in particle physics experiments is also discussed.

  6. Precision Crystal Calorimeters in High Energy Physics

    ScienceCinema

    Ren-Yuan Zhu

    2010-01-08

    Precision crystal calorimeters traditionally play an important role in high energy physics experiments. In the last two decades, it faces a challenge to maintain its precision in a hostile radiation environment. This paper reviews the performance of crystal calorimeters constructed for high energy physics experiments and the progress achieved in understanding crystal?s radiation damage as well as in developing high quality scintillating crystals for particle physics. Potential applications of new generation scintillating crystals of high density and high light yield, such as LSO and LYSO, in particle physics experiments is also discussed.

  7. Comparison between calorimeter and HLNC errors

    SciTech Connect

    Goldman, A.S. (Los Alamos National Lab., NM (United States)); De Ridder, P.; Laszlo, G. (International Atomic Energy Agency, Vienna (Austria))

    1991-01-01

    This paper summarizes an error analysis that compares systematic and random errors of total plutonium mass estimated for high-level neutron coincidence counter (HLNC) and calorimeter measurements. This task was part of an International Atomic Energy Agency (IAEA) study on the comparison of the two instruments to determine if HLNC measurement errors met IAEA standards and if the calorimeter gave significantly'' better precision. Our analysis was based on propagation of error models that contained all known sources of errors including uncertainties associated with plutonium isotopic measurements. 5 refs., 2 tabs.

  8. CFD-Predicted Tile Heating Bump Factors Due to Tile Overlay Repairs

    NASA Technical Reports Server (NTRS)

    Lessard, Victor R.

    2006-01-01

    A Computational Fluid Dynamics investigation of the Orbiter's Tile Overlay Repair (TOR) is performed to assess the aeroheating Damage Assessment Team's (DAT) existing heating correlation method for protuberance interference heating on the surrounding thermal protection system. Aerothermodynamic heating analyses are performed for TORs at the design reference damage locations body points 1800 and 1075 for a Mach 17.9 and a=39deg STS-107 flight trajectory point with laminar flow. Six different cases are considered. The computed peak heating bump factor on the surrounding tiles are below the DAT's heating bump factor values for smooth tile cases. However, for the uneven tiles cases the peak interference heating is shown to be considerably higher than the existing correlation prediction.

  9. Topology of (some) tiling spaces without finite local complexity

    E-print Network

    Natalie Priebe Frank; Lorenzo Sadun

    2007-01-15

    A basic assumption of tiling theory is that adjacent tiles can meet in only a finite number of ways, up to rigid motions. However, there are many interesting tiling spaces that do not have this property. They have "fault lines", along which tiles can slide past one another. We investigate the topology of a certain class of tiling spaces of this type. We show that they can be written as inverse limits of CW complexes, and their Cech cohomology is related to properties of the fault lines.

  10. Hadron spectroscopy

    SciTech Connect

    Cooper, S.

    1985-10-01

    Heavy quark systems and glueball candidates, the particles which are relevant to testing QCD, are discussed. The review begins with the heaviest spectroscopically observed quarks, the b anti-b bound states, including the chi state masses, spins, and hadronic widths and the non-relativistic potential models. Also, P states of c anti-c are mentioned. Other heavy states are also discussed in which heavy quarks combine with lighter ones. The gluonium candidates iota(1460), theta(1700), and g/sub T/(2200) are then covered. The very lightest mesons, pi-neutral and eta, are discussed. 133 refs., 24 figs., 16 tabs. (LEW)

  11. Advanced solar tile design and performance

    Microsoft Academic Search

    C. Flora; S. Bauman

    2002-01-01

    Unlike typical solar arrays whereby each string is composed of solar cells with discrete coverslides and interconnects, a solar tile contains a complete string, or multiple strings, under a single coverslide with coplanar contact solar cells mounted to and interconnected with Kapton®-copper flexible circuitry. Advance fabrication processes include robotic solar cell placement, vapor-phase batch soldering, and laser formed circuit vias.

  12. Pore Structure Analysis of RSI Tile

    NASA Technical Reports Server (NTRS)

    Whittemore, O. J., Jr.; Smiser, L. W.

    1973-01-01

    Mercury porosimetry gives a means of characterizing RSI tile pore structure in terms of porosity, pore size distribution, bulk density, specific surface area, mean pore diameter, and mean fiber diameter. It also allows the determination of the effects of heat treatment on these parameters. It is limited in application to open-pored structures, however, since any closed pore volume is ignored.

  13. Automatic CounTilings Doron ZEILBERGER1

    E-print Network

    Zeilberger, Doron

    that Wm,n(z, z ) is expressible as a product of m/2 different dilations of Un(z), the Tchebycheff of its dilation Um(z), and the product of m/2 of these creatures consequently satisfies a linear general sets of tiles, where both m and n are symbolic. From this, one should be able to extract, at least

  14. Phase diagram of a random tiling quasicrystal

    Microsoft Academic Search

    Weixiong Li; Michael Widom

    1992-01-01

    We study the phase diagram of a two-dimensional random tiling model for quasicrystals. At proper concentrations the model has 8-fold rotational symmetry. Landau theory correctly gives most of the qualitative features of the phase diagram, which is in turn studied in detail numerically using a transfer matrix approach. We find that the system can enter the quasicrystal phase from many

  15. A cluster approach to random Penrose tilings

    Microsoft Academic Search

    Petra Gummelt; Christoph Bandt

    2000-01-01

    An experimentally relevant subclass of the full random Penrose pentagon tiling ensemble is generated using a single cluster. Local matching rules based on cluster overlaps are equivalent to relatively weak axioms on minimal cluster distances. Energy and entropy arguments and recent results on constituent atomic clusters in decagonal quasicrystals are discussed.

  16. Structure factor for decorated Penrose tiling

    Microsoft Academic Search

    Bartlomiej Kozakowski; Janusz Wolny

    2005-01-01

    The structure factor for arbitrary decorated Penrose tiling has been calculated in average unit cell description. Analytical expression for the structure factor has been derived in physical space. The obtained formulas can be straightforward extended to some imperfect structures, including phasons or phonons and also some other defects.

  17. Statistics of 'worms' in Penrose tilings

    Microsoft Academic Search

    A. Pavlovitch; Y. Gefen; M. Kleman

    1989-01-01

    Certain structural aspects of two-dimensional Penrose tilings are studied using de Bruijn's pentagrid picture. The authors discuss the statistics of hexagons, decagons and 'worms' (sequences of adjacent hexagons bounded by two decagons). They show that within the discrete framework considered here, phason modes and structural transformation modes are located along particular 'worms' and they derive the spatial distribution of the

  18. Performance of the TFTR moveable limiter tiles

    Microsoft Academic Search

    M. Ulrickson; J. L. Cecchi; B. L. Doyle; H. F. Dylla; S. S. Medley; D. K. Owens; P. Trester

    1984-01-01

    The movable limiter for the Tokamak Fusion Test Reactor (TFTR) is composed of an Inconel X-750 backing plate covered with titanium carbide coated graphite tiles. It has been used for ohmic heating discharges at input powers up to about 2 MW for durations of up to 3 seconds. Even though these levels were well within the design requirements, discharges showed

  19. The Halting Probability via Wang Tiles

    Microsoft Academic Search

    Gregory J. Chaitin

    2008-01-01

    Using work of Hao Wang, we exhibit a tiling characterization of the bits of the halting probability . Algorithmic information theory (2) shows that pure mathematics is innitely complex and contains irreducible complexity. The canonical example of such irreducible complexity is the innite sequence of bits in the base-two expan- sion of the halting probability . The halting probability is

  20. L-Tromino Tiling of Multilated Chessboards

    ERIC Educational Resources Information Center

    Gardner, Martin

    2009-01-01

    An "n" x "n" chessboard is called deficient if one square is missing from any spot on the board. Can all deficient boards with a number of cells divisible by 3 be tiled by bent (or L-shaped) trominoes? The answer is yes, with exception of the order-5 board. This paper deals with the general problem plus numerous related puzzles and proofs…

  1. Self-Healing Tile Sets Erik Winfree

    E-print Network

    Batzoglou, Serafim

    Self-Healing Tile Sets Erik Winfree California Institute of Technology, Pasadena, CA 91125 winfree-assembly to heal damage to a self-assembled object. We present block transforms that convert an original error@caltech.edu Summary. Molecular self-assembly appears to be a promising route to bottom-up fabrication of complex

  2. Grout Analysis for EC and CC Calorimeters

    SciTech Connect

    Engstrom, L.L.; /Fermilab

    1987-01-06

    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.

  3. SLD liquid argon calorimeter prototype test results

    SciTech Connect

    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

    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.

  4. Research and Development for a Free-Running Readout System for the ATLAS LAr Calorimeters at the High Luminosity LHC

    E-print Network

    Hils, Maximilian; The ATLAS collaboration

    2015-01-01

    The ATLAS Liquid Argon (LAr) Calorimeters were designed and built to measure electromagnetic and hadronic energy in proton-proton collisions produced at the Large Hadron Collider (LHC) at centre-of-mass energies up to \\SI{14}{\\tera\\electronvolt} and instantaneous luminosities up to \\SI{d34}{\\per\\centi\\meter\\squared\\per\\second}. The High Luminosity LHC (HL-LHC) programme is now developed for up to 5-7 times the design luminosity, with the goal of accumulating an integrated luminosity of \\SI{3000}{\\per\\femto\\barn}. In the HL-LHC phase, the increased radiation levels require a replacement of the front-end (FE) electronics of the LAr Calorimeters. Furthermore, the ATLAS trigger system is foreseen to increase the trigger accept rate and the trigger latency which requires a larger data volume to be buffered. Therefore, the LAr Calorimeter read-out will be exchanged with a new FE and a high bandwidth back-end (BE) system for receiving data from all \

  5. Application of Large Scale GEM for Digital Hadron Calorimetry

    NASA Astrophysics Data System (ADS)

    Yu, J.; Baldelomar, E.; Park, K.; Park, S.; Sosebee, M.; Tran, N.; White, A. P.

    The detectors proposed for future e+e- colliders (ILC and CLIC) demand a high level of precision in the measurement of jet energies. Various technologies have been proposed for the active layers of the digital hadron calorimetry to be used in conjunction with the Particle Flow Algorithm (PFA) approach. The High Energy Physics group of the University of Texas at Arlington has been developing Gas Electron Multiplier (GEM) detectors for use as the calorimeter active gap detector. To understand this application of GEMs, two kinds of prototype GEM detectors have been tested. One has 30x30 cm2 active area double GEM structure with a 3 mm drift gap, a 1 mm transfer gap and a 1 mm induction gap. The other one has two 2x2 cm2 GEM foils in the amplifier stage with a 5 mm drift gap, a 2 mm transfer gap and a 1 mm induction gap. We will summarize the results of tests of these prototypes, using cosmic rays and sources, in terms of their applicability to a digital hadron calorimeter system. We will discuss plans for the construction of 1m2 layers of GEM digital hadron calorimetry to be used as part of a 1m3 stack to be used in a major test beam study of hadronic showers.

  6. An efficient pseudomedian filter for tiling microrrays

    PubMed Central

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

    2007-01-01

    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 . PMID:17555595

  7. Nuclear-nuclear collision centrality determination by the spectators calorimeter for the MPD setup at the NICA facility

    NASA Astrophysics Data System (ADS)

    Golubeva, M. B.; Guber, F. F.; Ivashkin, A. P.; Isupov, A. Yu.; Kurepin, A. B.; Litvinenko, A. G.; Litvinenko, E. I.; Migulina, I. I.; Peresedov, V. F.

    2013-01-01

    The work conditions of the hadron calorimeter for spectators registration (Zero Degree Calorimeter, ZDC) were studied for the heavy nuclei collisions with the several GeV invariant energy. The ZDC simulations were performed for the MPD (Multi-Purpose Detector) at the NICA (Nuclotron-based Ion Collider fAcility) collider, which are under developement at the Joint Institute for Nuclear Research (JINR, Dubna). Taking into account the spectator nuclear fragments leads to a nonmonotonic dependence of the ZDC response on the impact parameter. The reason for this dependence studied with several event generators is the primary beam hole in the ZDC center. It is shown, that the ZDC signal should be combined with a data from other MPD@NICA detector subsystems to determine centrality.

  8. Boeing's High Voltage Solar Tile Test Results

    NASA Technical Reports Server (NTRS)

    Reed, Brian J.; Harden, David E.; Ferguson, Dale C.; Snyder, David B.

    2002-01-01

    Real concerns of spacecraft charging and experience with solar array augmented electrostatic discharge arcs on spacecraft have minimized the use of high voltages on large solar arrays despite numerous vehicle system mass and efficiency advantages. Boeing's solar tile (patent pending) allows high voltage to be generated at the array without the mass and efficiency losses of electronic conversion. Direct drive electric propulsion and higher power payloads (lower spacecraft weight) will benefit from this design. As future power demand grows, spacecraft designers must use higher voltage to minimize transmission loss and power cable mass for very large area arrays. This paper will describe the design and discuss the successful test of Boeing's 500-Volt Solar Tile in NASA Glenn's Tenney chamber in the Space Plasma Interaction Facility. The work was sponsored by NASA's Space Solar Power Exploratory Research and Technology (SERT) Program and will result in updated high voltage solar array design guidelines being published.

  9. Structure of HadronsStructure of Hadrons gluonsgluons

    E-print Network

    Gilfoyle, Jerry

    Structure of HadronsStructure of Hadrons gluonsgluons Gluons are the exchange particles which #12;Structure of HadronsStructure of Hadrons Hadrons as color neutral objectsHadrons as color neutral changes. rr rr __ bb __ bb gg __ gg __ gg gg gg __ rr gg bb __ gg __ bb #12;Structure of Hadrons

  10. Calorimeter, Coffee Cup (ChemPages Lab)

    NSDL National Science Digital Library

    Calorimeter, Coffee Cup: this is a resource in the collection "ChemPages Laboratory Resources". A coffee cup calorimeter is a useful, simple device that can be used to measure the temperature change that accompanies a reaction. A Styrofoam cup is used because it is a good insulator. The cup will absorb (or supply) negligible amounts of heat during most General Chemistry experiments. Thus, any change in temperature is assumed to be due only to the reaction, and the heat transferred in the reaction may be calculated. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.

  11. Status of ASIC readout for electromagnetic calorimeter

    E-print Network

    Elmaddin Guliyev

    2012-10-18

    The next generation experiment in high energy particle physics will be International Linear Collider of electron and positron at the TeV scale. The experiment is aim to search the Higgs particle and to measure its properties. The physics program required the detector with high performance. One of the central detector is a Electromagnetic calorimeter, is going to measure the energy and position of high energy photons. Fine granularity and compactness brings to utilize the Si-W sampling detector. Due to high granularity the electromagnetic calorimeter will comprise of the order of $10^8$ readout cells. The recent developed prototype ASIC chip with 36 channels will be used readout of Si-W ECAL. The performance study will discuss of developed ASIC readout with ECAL prototype, use of pulse generator.

  12. NASA TileWorld Simulator Program

    NASA Technical Reports Server (NTRS)

    Philips, Andrew; Bresina, John; Drummond, Mark

    1993-01-01

    NASA TileWorld (NTW) computer program formulated to further research on planning, scheduling, and control problems. Designed to focus on three particular attributes of real-world problems: exogenous events, uncertain outcomes of actions, and metric time. Written specifically for use by NASA, NTW modified easily to act as software base for other simulated environments. Written in Allegro Common Lisp for Sun-3-(TM) and Sun-4-series(TM) computers running SunOS(TM).

  13. TileCal ROD Motherboard Software Library

    Microsoft Academic Search

    B. Salvachúa; J. Castelo; V. Castillo; C. Cuenca; A. Ferrer; E. Fullana; E. Higón; C. Iglesias; A. Munar; J. Poveda; A. Ruiz-Martínez; C. Solans; J. Valls

    This note describes the software library and an associated standalone application program to handle the TileCal ROD VME motherboard. The library uses the CMT packages vme_rcc and rcc_error, from the ATLAS Online Data Flow to handle the standard crate controller, VP-110 from Concurrent Technologies, and the custom bit3_rcc CMT package to handle an alternative crate controller, the BIT-3 from SBSTM

  14. THE DYNAMICAL PROPERTIES OF PENROSE TILINGS

    Microsoft Academic Search

    E. ARTHUR ROBINSON

    1997-01-01

    The set of Penrose tilings, when provided with a natural compact metric topology, becomes a strictly ergodic dynamical system under the action of R2 by translation. We show that this action is an almost 1:1 extension of a minimal R2 action by rotations on T4, i.e., it is an R2 generalization of a Sturmian dynamical system. We also show that

  15. Tile Hamiltonian for Decagonal AlCoCu

    NASA Astrophysics Data System (ADS)

    Al-Lehyani, Ibrahim; Widom, Mike

    2002-03-01

    A tile Hamiltonian (TH) replaces the actual atomic interactions in a quasicrystal with effective interactions between and within tiles. We studied AlCoCu decagonal quasicrystals described as decorated Hexagon-Boat-Star (HBS) tiles(E. Cockayne and M. Widom, Phys. Rev. Lett. 81), 598 (1998) using ab-initio methods. The dominant term in the TH counts the number of H, B and S tiles. Phason flips that replace an HS pair with a BB pair lower the energy. In Penrose tilings, quasiperiodicity is forced by arrow matching rules on rhombus edges. The edge orientation in AlCoCu is due to Co/Cu chemical ordering^1. Tile edges meet in vertices with 72^circ or 144^circ angles. We find strong interactions between edge orientations at 72^circ vertices that force a subset of the Penrose matching rules. Interactions at 144^circ vertices are somewhat weaker. The ``vertical'' edge orientation disorder interactions are intermediate in strength.

  16. Troubleshooting guide for Mound calorimeter systems

    SciTech Connect

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

    1988-06-29

    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.

  17. Monte Carlo simulation of HERD calorimeter

    NASA Astrophysics Data System (ADS)

    Xu, M.; Chen, G. M.; Dong, Y. W.; Lu, J. G.; Quan, Z.; Wang, L.; Wang, Z. G.; Wu, B. B.; Zhang, S. N.

    2014-07-01

    The High Energy cosmic-Radiation Detection (HERD) facility onboard China's Space Station is planned for operation starting around 2020 for about 10 years. It is designed as a next generation space facility focused on indirect dark matter search, precise cosmic ray spectrum and composition measurements up to the knee energy, and high energy gamma-ray monitoring and survey. The calorimeter plays an essential role in the main scientific objectives of HERD. A 3-D cubic calorimeter filled with high granularity crystals as active material is a very promising choice for the calorimeter. HERD is mainly composed of a 3-D calorimeter (CALO) surrounded by silicon trackers (TK) from all five sides except the bottom. CALO is made of 9261 cubes of LYSO crystals, corresponding to about 55 radiation lengths and 3 nuclear interaction lengths, respectively. Here the simulation results of the performance of CALO with GEANT4 and FLUKA are presented: 1) the total absorption CALO and its absorption depth for precise energy measurements (energy resolution: 1% for electrons and gammarays beyond 100 GeV, 20% for protons from 100 GeV to 1 PeV); 2) its granularity for particle identification (electron/proton separation power better than 10-5); 3) the homogenous geometry for detecting particles arriving from every unblocked direction for large effective geometrical factor (<3 m2sr for electron and diffuse gammarays, >2 m2sr for cosmic ray nuclei); 4) expected observational results such as gamma-ray line spectrum from dark matter annihilation and spectrum measurement of various cosmic ray chemical components.

  18. The UA1 upgrade calorimeter trigger processor

    Microsoft Academic Search

    N. Bains; S. A. Baird; P. Biddulph; D. Campbell; M. Cawthraw; D. Charlton; J. Coughlan; E. Eisenhandler; N. Ellis; I. F. Fensome; P. Flynn; S. Galagedera; J. Garvey; G. Grayer; J. Gregory; R. Halsall; M. P. Jimack; P. Jovanovic; I. R. Kenyon; M. Landon; J. Oliver; D. Robinson; T. P. Shah; R. Stephens; K. Sumorok

    1990-01-01

    The increased luminosity of the improved CERN Collider and the more subtle signals of second-generation collider physics demand increasingly sophisticated triggering. We have built a new first-levl trigger processor designed to use the excellent granularity of the UA1 upgrade calorimeter. This device is entirely digital and handles events in 1.5 mus, thus introducing no dead time. Its most novel feature

  19. Thermochemistry : BombCalorimeter (4 Variations)

    NSDL National Science Digital Library

    Stearic acid (CH 3 (CH 2 ) 16 CO 2 H) is a fatty acid, the part of fat that stores most of the energy. 1.00 g of stearic acid was burned in a bomb calorimeter. The bomb had a heat capacity of 652 J/ o C and a 500. g water reservoir. If the temperature rose from 25.0 to 39.3 o C, how much heat was released when the stearic acid was burned?

  20. The electromagnetic calorimeter of the NOMAD experiment

    Microsoft Academic Search

    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

    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

  1. Laser printing of enamels on tiles

    NASA Astrophysics Data System (ADS)

    Fernández-Pradas, J. M.; Restrepo, J. W.; Gómez, M. A.; Serra, P.; Morenza, J. L.

    2007-07-01

    A Nd:YAG laser beam is used as a tool to print patterns of coloured enamels on tile substrates. For this, the laser beam is scanned over a layer of raw enamel previously sprayed on the tile surface. The possibility to focus the laser energy to heat a small zone without affecting the rest of the piece presents some advantages in front of traditional furnace techniques in which the whole piece has to be heated; among them, energy saving and the possibility to apply enamels with higher melting temperatures than those of the substrate. In this work, we study the effects of laser irradiation of a green enamel, based in chromium oxide pigment and lead frit, deposited on a white tile substrate. Lines obtained with different combinations of laser beam power and scan speeds were investigated with the aim to optimize the process from the point of view of the quality of the patterns. For this purpose, the morphology of the lines and their cross-sections is studied. The results show that lines with good visual properties can be printed with the laser. The characteristics of the marked lines were found to be directly related with the accumulated energy density delivered. Moreover, there is a linear relationship between the accumulated energy density and the volume of melted material. A minimum accumulated energy density is required to melt a shallow zone of the glazed substrate to allow the adhesion of the enamelled lines.

  2. Thermoregulated enclosure for controlling thermal drift in a radiation calorimeter

    SciTech Connect

    Kubo, H.; Brown, D.E.; Russell, M.D.

    1985-05-01

    The ability to control thermal drifts is essential in operating a calorimeter. We investigated a thermal enclosure, which envelops the calorimeter with temperature-regulated air, thus thermally isolating the calorimeter from the room. The desired temperature in the enclosure is controlled by a control circuit and a thermoelectric device, which works as a Peltier effect heat pump. In this report, the details of the enclosure design and construction are presented with actual performance evaluations.

  3. 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

  4. Equilibrium quasicrystal phase of a Penrose tiling model

    Microsoft Academic Search

    Lei-Han Tang; Marko V. Jaric

    1990-01-01

    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

  5. The Triangle Pattern — a New Quasiperiodic Tiling with Fivefold Symmetry

    NASA Astrophysics Data System (ADS)

    Baake, M.; Kramer, P.; Schlottmann, M.; Zeidler, D.

    We introduce a quasiperiodic tiling with fivefold symmetry that is built from two types of triangles, an acute and an obtuse one. An easy to computerize construction algorithm based on the dualization scheme is presented that creates the pattern not pointwise but tile by tile directly. We present the vertex statistics, the inflation rule, and the Fourier analysis for selected decorations with pointlike atoms. A connection to the planar Penrose pattern and to the 3D icosahedral quasilattice is briefly discussed.

  6. Gap Labelling for Schrödinger Operators on Quasiperiodic Tilings

    E-print Network

    Johannes Kellendonk

    1994-06-27

    For a large class of tilings, including those which are obtained by the generalized dual method from regular grids, it is shown that their algebra is stably isomorphic to a crossed product with $\\Z^d$. Penrose tilings belong to this class. This enlarges the class of tilings of which can be shown that a set of possible gap labels is completely determined by an invariant measure on the hull.

  7. EM Calorimeters for SoLID at Jefferson Lab

    SciTech Connect

    Z.W. Zhao, J. Huang, M. Meziane, X. Zheng, P.E. Reimer, D. Armstrong, T. Averett, W. Deconinck

    2012-12-01

    Several approved experiments at Jefferson Lab for the 12 GeV era will use the proposed Solenoid Large Intensity Device (SoLID) spectrometer. Two EM calorimeters with a total area of 15 square meters are required for electron identification and electron-pion separation. The challenge is to build calorimeters that can withstand high radiation doses in high magnetic field region and bring photon signals to low field region for readout. Several types of calorimeters were considered and we are favoring Shashlyk type as a result of balancing performance and cost. Our preliminary design and simulation of SoLID EM calorimeters are presented.

  8. NASA TileWorld manual (system version 2.2)

    NASA Technical Reports Server (NTRS)

    Philips, Andrew B.; Bresina, John L.

    1991-01-01

    The commands are documented of the NASA TileWorld simulator, as well as providing information about how to run it and extend it. The simulator, implemented in Common Lisp with Common Windows, encodes a particular range in a spectrum of domains, for controllable research experiments. TileWorld consists of a two dimensional grid of cells, a set of polygonal tiles, and a single agent which can grasp and move tiles. In addition to agent executable actions, there is an external event over which the agent has not control; this event correspond to a 'gust of wind'.

  9. Voronoi and Delone Clusters in Dual Quasiperiodic Tilings

    NASA Astrophysics Data System (ADS)

    Kramer, Peter

    With the new paradigm of covering on one hand and the theory of lattice-projected dual quasiperiodic tilings and their windows on the other, we examine these questions for dual tilings and look for corresponding coverings. Does the lattice ? provide geometric objects whose projections can serve as candidates for clusters and for covering? We examine Delone and Voronoi polytopes of the lattice and from them project clusters into the tiling. We start with a summary of the geometry of lattices, quasiperiodic functions, and dual tiling theory. The notions of a fundamental domain and of covering are introduced. General results and constructive methods for Delone and Voronoi clusters are given. The analysis uses an explicit construction of windows for these clusters. The uniqueness and the symmetry breaking of the filling are shown to be general features. The dual 2D quasiperiodic tilings associated with the 4D root lattice A4, the Penrose and the triangle tilings, illuminate all aspects and properties of these clusters. For the dual 3D icosahedral tilings we construct the Delone and Voronoi clusters. From the window theory, we prove a 98.7% covering of the vertices and an imperfect covering of the tiles. Finally, we propose a method for completing the incomplete covering of the tilings.

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

    SciTech Connect

    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

    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.

  11. ALT-II armor tile design for upgraded TEXTOR operation

    SciTech Connect

    Newberry, B.L. [Univ. of Michigan, Ann Arbor, MI (United States); McGrath, R.T.; Watson, R.D. [Sandia National Labs., Albuquerque, NM (United States); Kohlhaas, W.; Finken, K.H. [Kernforschungsanlage Juelich GmbH (Germany). Inst. fuer Plasmaphysik; Noda, N. [National Inst. for Fusion Science, Nagoya (Japan)

    1994-08-01

    The upgrade of the TEXTOR tokamak at KFA Juelich was recently completed. This upgrade extended the TEXTOR pulse length from 5 seconds to 10 seconds. The auxiliary heating was increased to a total of 8.0 MW through a combination of neutral beam injection and radio frequency heating. Originally, the inertially cooled armor tiles of the full toroidal belt Advanced Limiter Test -- II (ALT-II) were designed for a 5-second operation with total heating of 6.0 MW. The upgrade of TEXTOR will increase the energy deposited per pulse onto the ALT-II by about 300%. Consequently, the graphite armor tiles for the ALT-II had to be redesigned to avoid excessively high graphite armor surface temperatures that would lead to unacceptable contamination of the plasma. This redesign took the form of two major changes in the ALT-II armor tile geometry. The first design change was an increase of the armor tile thermal mass, primarily by increasing the radial thickness of each tile from 17 mm to 20 mm. This increase in the radial tile dimension reduces the overall pumping efficiency of the ALT-II pump limiter by about 30%. The reduction in exhaust efficiency is unfortunate, but could be avoided only by active cooling of the ALT-II armor tiles. The active cooling option was too complicated and expensive to be considered at this time. The second design change involved redefining the plasma facing surface of each armor tile in order to fully utilize the entire surface area. The incident charged particle heat flux was distributed uniformly over the armor tile surfaces by carefully matching the radial, poloidal and toroidal curvature of each tile to the plasma flow in the TEXTOR boundary layer. This geometry redefinition complicates the manufacturing of the armor tiles, but results in significant thermal performance gains. In addition to these geometry upgrades, several material options were analyzed and evaluated.

  12. The NA49 large acceptance hadron detector

    E-print Network

    Afanasiev, S V; Appelshäuser, H; Bächler, J; Barna, D; Barnby, L S; Bartke, Jerzy; Barton, R A; Betev, L; Bialkowska, H; Bieser, F; Billmeier, A; Blyth, C O; Böck, R K; Bormann, C; Bracinik, J; Brady, F P; Brockmann, R; Brun, R; Buncic, P; Caines, H L; Cebra, D; Cooper, G E; Cramer, J G; Csató, P; Cyprian, M; Dunn, J; Eckardt, V; Eckhardt, F; Empl, T; Eschke, J; Ferguson, M I; Fessler, H; Fischer, H G; Flierl, D; Fodor, Z; Frankenfeld, Ulrich; Foka, P Y; Freund, P; Friese, V; Ftácnik, J; Fuchs, M; Gabler, F; Gál, J; Ganz, R E; Gazdzicki, M; Gladysz-Dziadus, E; Grebieszkow, J; Günther, J; Harris, J W; Hegyi, S; Henkel, T; Hill, L A; Hlinka, V; Huang, I; Hümmler, H; Igo, G; Irmscher, D; Ivanov, M; Janik, R; Jacobs, P; Jones, P G; Kadija, K; Kolesnikov, V I; Kowalski, M; Lasiuk, B; Lévai, Peter; Liebicher, K; Lynen, U; Malakhov, A I; Margetis, S; Markert, C; Marks, C; Mayes, B W; Melkumov, G L; Mock, A; Molnár, J; Nelson, J M; Oldenburg, M; Odyniec, Grazyna Janina; Pálla, G; Panagiotou, A D; Pestov, Yu N; Petridis, A; Pikna, M; Pimpl, W; Pinsky, L; Piper, A; Porter, R J; Poskanzer, A M; Poziombka, S; Prindle, D J; Pühlhofer, F; Rauch, W; Reid, J G; Renfordt, R E; Retyk, W; Ritter, H G; Röhrich, D; Roland, C; Roland, G; Rudolph, H; Rybicki, A; Sammer, T; Sandoval, A; Sann, H; Schäfer, E; Schmidt, R; Schmischke, D; Schmitz, N; Schönfelder, S; Semenov, A Yu; Seyboth, J; Seyboth, P; Seyerlein, J; Siklér, F; Sitár, B; Skrzypczak, E; Squier, G T A; Stelzer, H; Stock, Reinhard; Strmen, P; Ströbele, H; Struck, C; Susa, T; Szarka, I; Szentpétery, I; Szymanski, P; Sziklai, J; Toy, M; Trainor, T A; Trentalange, S; Ullrich, T S; Vassiliou, Maria; Veres, G I; Vesztergombi, G; Vranic, D; Wang, F; Weerasundara, D D; Wenig, S; Whitten, C; Wieman, H H; Wienold, T; Wood, L; Yates, T A; Zimányi, J; Zhu, X Z; Zybert, R

    1999-01-01

    The NA49 detector is a wide acceptance spectrometer for the study of hadron production in p+p, p+A, and A+A collisions at the CERN SPS. The main components are 4 large volume TPCs for tracking and particle identification via $dE/dx$. TOF scintillator arrays complement particle identification. Calorimeters for transverse energy determination and triggering, a detector for centrality selection in p+A collisions, and beam definition detectors complete the set-up. A description of all detector components is given with emphasis on new technical realizations. Performance and operational experience are discussed in particular with respect to the high track density environment of central Pb+Pb collisions.

  13. Weak mixing angle measurements at hadron colliders

    E-print Network

    Di Simone, Andrea; The ATLAS collaboration

    2015-01-01

    The Talk will cover weak mixing angle measurements at hadron colliders ATLAS and CMS in particular. ATLAS has measured the forward-backward asymmetry for the neutral current Drell Yan process in a wide mass range around the Z resonance region using dielectron and dimuon final states with $\\sqrt{s}$ =7 TeV data. For the dielectron channel, the measurement includes electrons detected in the forward calorimeter which extends the covered phase space. The result is then used to extract a measurement of the effective weak mixing angle. Uncertainties from the limited knowledge on the parton distribution functions in the proton constitute a significant part of the uncertainty and a dedicated study is performed to obtain a PDF set describing W and Z data measured previously by ATLAS. Similar studies from CMS will be reported.

  14. Triangular and Hexagonal Tile Self-Assembly Systems Triangular and Hexagonal Tile Self-Assembly Systems

    E-print Network

    Kari, Lila

    -assembly. A systematic study of self-assembly as a computational process was initiated by Adleman1 , who studied the time of the construction of large squares via self-assembly. Rothemund and Winfree5 studied the self-assembly of squares. Besides a natural the- oretical interest, this study is motivated by the fact that triangular DNA tiles ha

  15. Construction, assembly and tests of the ATLAS electromagnetic barrel calorimeter

    Microsoft Academic Search

    B. Aubert; B. Beaugiraud; J. Colas; P. Delebecque; L. Di Ciaccio; M. El Kacimi; P. Ghez; C. Girard; M. Gouanère; D. Goujdami; A. Jeremie; S. Jézéquel; R. Lafaye; N. Massol; P. Perrodo; H. Przysiezniak; G. Sauvage; J. Thion; I. Wingerter-Seez; R. Zitoun; Y. Zolnierowski; R. Alforque; H. Chen; J. Farrell; H. Gordon; R. Grandinetti; R. Hackenburg; A. Hoffmann; J. Kierstead; J. Koehler; F. Lanni; D. Lissauer; H. Ma; D. Makowiecki; T. Muller; S. Norton; V. Radeka; D. Rahm; M. Rehak; S. Rajagopalan; S. Rescia; K. Sexton; J. Sondericker; I. Stumer; H. Takai; A. Belymam; D. Benchekroun; C. Driouichi; A. Hoummada; M. Hakimi; M. Knee; R. Stroynowski; B. Wakeland; V. Datskov; V. Drobin; M. Aleksa; J. Bremer; T. Carli; M. Chalifour; J. L. Chevalley; F. Djama; L. Ema; C. Fabre; P. Fassnacht; F. Gianotti; A. Gonidec; J. B. Hansen; L. Hervas; T. Hott; C. Lacaste; C. P. Marin; P. Pailler; A. Pleskatch; D. Sauvage; G. Vandoni; V. Vuillemin; H. Wilkens; S. Albrand; B. Belhorma; J. Collot; P. de Saintignon; D. Dzahini; A. Ferrari; J. Fulachier; M. L. Gallin-Martel; J. Y. Hostachy; G. Laborie; F. Ledroit-Guillon; P. Martin; J. F. Muraz; F. Ohlsson-Malek; S. Saboumazrag; S. Viret; R. Othegraven; C. Zeitnitz; D. Banfi; L. Carminati; D. Cavalli; M. Citterio; G. Costa; M. Delmastro; M. Fanti; L. Mandelli; M. Mazzanti; F. Tartarelli; E. Augé; S. Baffioni; J. Bonis; W. Bonivento; C. Bourdarios; C. De la Taille; L. Fayard; D. Fournier; G. Guilhem; P. Imbert; L. Iconomidou-Fayard; G. Le Meur; M. Mencik; J.-M. Noppe; G. Parrour; P. Puzo; D. Rousseau; A.-C. Schaffer; N. Seguin-Moreau; L. Serin; G. Unal; J.-J. Veillet; F. Wicek; D. Zerwas; F. Astesan; W. Bertoli; B. Canton; F. Fleuret; D. Imbault; D. Lacour; B. Laforge; Ph. Schwemling; E. M. Abouelouafa; A. Ben Mansour; R. Cherkaoui; Y. El Mouahhidi; H. Ghazlane; A. Idrissi; K. Bazizi; D. England; V. Glebov; T. Haelen; F. Lobkowicz; P. Slattery; J. Belorgey; N. Besson; M. Boonekamp; D. Durand; J. Ernwein; B. Mansoulié; F. Molinié; J. P. Meyer; P. Perrin; J. Schwindling; J. P. Taguet; H. Zaccone; B. Lund-Jensen; S. Rydström; Y. Tayalati; B. Botchev; G. Finocchiaro; J. Hoffman; R. L. McCarthy; M. Rijssenbeek; J. Steffens; M. Zdrazil; H. M. Braun

    2006-01-01

    The construction and assembly of the two half barrels of the ATLAS central electromagnetic calorimeter and their insertion into the barrel cryostat are described. The results of the qualification tests of the calorimeter before installation in the LHC ATLAS pit are given.

  16. Ac loss calorimeter for three-phase cable

    SciTech Connect

    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

    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.

  17. Covering Shapes with Tiles: Primary Students' Visualisation and Drawing

    Microsoft Academic Search

    Kay Owens

    1998-01-01

    Students' early area· concepts were llwestigated by an analysis of responses to a worksheet of items that involved visualising the tiling of given figures. Students in Years 2 and 4 in four schools attempted the items on three occasions and some of the students completed ten classroom spatial activities. Half the students had difficulty visualising the tiling of shapes, but

  18. Tile-based texture mapping on graphics hardware

    Microsoft Academic Search

    Li-Yi Wei

    2004-01-01

    Texture mapping has been a fundamental feature for commodity graphics hardware. However, a key challenge for texture mapping is how to store and manage large textures on graphics processors. In this paper, we present a tile-based texture mapping algorithm by which we only have to physically store a small set of texture tiles instead of a large texture. Our algorithm

  19. Low-Density, Aerogel-Filled Thermal-Insulation Tiles

    NASA Technical Reports Server (NTRS)

    Santos, Maryann; Heng, Vann; Barney, Andrea; Oka, Kris; Droege, Michael

    2005-01-01

    Aerogel fillings have been investigated in a continuing effort to develop low-density thermal-insulation tiles that, relative to prior such tiles, have greater dimensional stability (especially less shrinkage), equal or lower thermal conductivity, and greater strength and durability. In preparation for laboratory tests of dimensional and thermal stability, prototypes of aerogel-filled versions of recently developed low-density tiles have been fabricated by impregnating such tiles to various depths with aerogel formations ranging in density from 1.5 to 5.6 lb/ft3 (about 53 to 200 kg/cu m). Results available at the time of reporting the information for this article showed that the thermal-insulation properties of the partially or fully aerogel- impregnated tiles were equivalent or superior to those of the corresponding non-impregnated tiles and that the partially impregnated tiles exhibited minimal (<1.5 percent) shrinkage after multiple exposures at a temperature of 2,300 F (1,260 C). Latest developments have shown that tiles containing aerogels at the higher end of the density range are stable after multiple exposures at the said temperature.

  20. FRACTAL TILES ASSOCIATED WITH SHIFT RADIX SYSTEMS ERIE BERTH

    E-print Network

    FRACTAL TILES ASSOCIATED WITH SHIFT RADIX SYSTEMS VAL â?? ERIE BERTH â?? E, ANNE SIEGEL, WOLFGANG to fractal shapes, such as the classical Rauzy fractal and the twin dragon. These fractals turned out a collection of fractal tiles with shift radix systems. We show that for certain classes of parameters r

  1. The tilings of Kari and E. Arthur Robinson, Jr.

    E-print Network

    Robinson Jr., E. Arthur (Robbie)

    . · In a valid tiling, colors of adjacent edges must match. · Essentialy a 2-dimensional SFT, · (any 2-d SFT can Fibonacci SFT. #12;Finite state machine #12;Hao Wang, 1961 · Studied problem of existence of a valid tiling of the plane. · Equivalently: every nonempty 2-dimensional SFT has a periodic orbit. · (Wang did not use

  2. Hydrologic characterization of a tile drained headwater watershed

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Artificial drainage, also known as subsurface or tile drainage is paramount to sustaining crop production agriculture in the poorly-drained, humid regions of the world. Hydrologic assessments of individual plots and fields with tile drainage are becoming common; however, a major void exists in our u...

  3. Enhancement of Tile and Pothole Flow Components in SWAT

    E-print Network

    Enhancement of Tile and Pothole Flow Components in SWAT: Application to the Walnut Creek Watershed, Iowa A. Saleh, D. Bing, J.G. Arnold, and D.B. Jaynes #12;OBJECTIVES n To enhance the SWAT model with new tile drainage and pothole surface storage components (SWAT-M) n Evaluated the SWAT-M using

  4. Thermodynamic behavior of a Penrose-tiling quasicrystal

    Microsoft Academic Search

    Katherine J. Strandburg; Paul R. Dressel

    1990-01-01

    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

  5. The Art of Space Filling in Penrose Tilings and Fractals

    Microsoft Academic Search

    San Le

    2011-01-01

    Incorporating designs into the tiles that form tessellations presents an interesting challenge for artists. Creating a viable MC Escher like image that works esthetically as well as functionally requires resolving incongruencies at a tile's edge while constrained by its shape. Escher was the most well known practitioner in this style of mathematical visualization, but there are significant mathematical shapes to

  6. Nutrient and Pesticide Removal From Laboratory Simulated Tile Drainage Discharge

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Excess nutrient and pesticide transport through subsurface tile drainage is well documented. One approach receiving consideration for reducing the amount of nutrients and pesticides in subsurface drainage waters is end-of-tile filters. The filters are often comprised of industrial wastes or by-produ...

  7. Creative Tiling: A Story of 1000-and-1 Curves

    ERIC Educational Resources Information Center

    Al-Darwish, Nasir

    2012-01-01

    We describe a procedure that utilizes symmetric curves for building artistic tiles. One particular curve was found to mesh nicely with hundreds other curves, resulting in eye-catching tiling designs. The results of our work serve as a good example of using ideas from 2-D graphics and algorithms in a practical web-based application.

  8. Tiling 3D Euclidean Space with Acute Tetrahedra Ungor \\Lambda

    E-print Network

    Üngör, Alper

    Tiling 3D Euclidean Space with Acute Tetrahedra Alper ¨ Ung¨or \\Lambda Abstract. We show that it is possible to tile the three dimensional space using only acute dihedral angle tetrahedra. Several dimensions but not necessarily in three dimensions. 1 Introduction Definition 1 A tetrahedra is acute if all

  9. Vibration and scattering monitoring of Japanese roofing tile by accelerometer

    Microsoft Academic Search

    Satoru Okamoto

    2011-01-01

    A series of wind tunnel tests were conducted on the vibration and scattering behavior of full-size models of tiles widely used as roofing materials on Japanese wooden dwellings. This study has investigated the nature and source of such movement with the aim of providing better insight into the mechanism. The roofing tiles were set up on a pitched roof in

  10. Thermochemistry : CoffeeCupCalorimeter (2 Variations)

    NSDL National Science Digital Library

    A block of copper is heated to {x} °C and then is dropped into a coffee cup calorimeter containing {y} g of water at 25.0 °C. The final temperature of the system is 45.1 °C. What is the mass of the copper block to the nearest gram? (Assume all heat is transferred to the water). Write your answer in the box, and do NOT include units. Specific heat capacity of copper = 0.383 J/(g*°C) Specific heat capacity of water = 4.18 J/(g*°C)

  11. Characteristics of hadronic interactions in the forward direction

    NASA Astrophysics Data System (ADS)

    Katkov, I.

    2013-06-01

    A selection of results obtained with very forward detectors of the CMS experiment at LHC is presented. Studies of the energy flow, dE?d?, are extended into very forward region with CASTOR calorimeter (-6.6 < ? < 5.2) for pp collisions at 3 different center-of-mass energies (0.9, 2.76 and 7 TeV) and PbPb collisions at 2.76A TeV. Results are compared to hadronic interaction models as implemented in standard collider physics generators and generators used in cosmic-ray physics.

  12. Charge Detector for the Imaging Calorimeter for ACCESS (ICA)

    NASA Technical Reports Server (NTRS)

    Lee, Jeongin; Adams, J. H., Jr.

    2000-01-01

    NASA's Advanced Cosmic Ray Experiment for the Space Station (ACCESS) Mission is planned to consist of a transition radiation detector (TRD) and a thin ionization calorimeter. In order to measure the charge of the primary cosmic ray, it is necessary for the calorimeter to have its own charge detector. Silicon detectors are chosen for the charge detector because of their excellent resolution, small size and nearly square shape. Monte Carlo simulations are performed to find the probability of misidentifying protons as alpha particles due to backscattered radiation from the calorimeter. Simulations were also used to investigate identifying primary cosmic rays that fragmented in the TRD before reaching the calorimeter. For this study algorithms have been developed for determining a direction of the core shower in the calorimeter. These algorithms are used to find the approximate location of the primary particle in the silicon detectors. Results show the probability to misidentify the charge depends upon the energy and direction of the primary particles.

  13. Closed Gap Slug Calorimeter for Plasma Stream Characterization

    NASA Technical Reports Server (NTRS)

    Nawaz, Anuscheh; Gorbunov, Sergey; Terrazas-Salinas, Imelda; Jones, Steven M.

    2012-01-01

    Slug calorimeters are used in sheer and stagnation mode to characterize heat flux levels for high enthalpy streams. The traditional design features a gap between slug and holder, which can be of concern in these convective heat flux environments. The challenge is to develop a calorimeter that closes the gap to gas flow, but largely maintains thermal insulation of the slug. The work presented herein introduces two new slug calorimeter designs featuring a closed gap. This is done using either aerogel as a filler or press fitting the slug with a disk. The designs were verified and compared to the baseline calorimeter design under radiative heat flux. Building on this, the calorimeters were exposed to convective heat flux in the arc-jet facilities. Results from the new designs and conclusions on the impact of the gap in convective heat flux will be shown.

  14. Performance of the CREAM calorimeter in accelerator beam test

    E-print Network

    Yoon, Y S; Bagliesi, M G; Bigongiari, G; Ganel, O; Han, J H; Hyun, H J; Jeon, J A; Kang, T G; Kim, H J; Kim, K C; Lee, J K; Lee, M H; Lutz, L; Maestro, P; Malinine, A; Marrocchesi, P S; Nam, S W; Park, H; Park, I H; Park, N H; Seo, E S; Sina, R; Wu, J; Yang, J; Zei, R; Zinn, S Y

    2010-01-01

    The CREAM calorimeter, designed to measure the spectra of cosmic-ray nuclei from under 1 TeV to 1000 TeV, is a 20 radiation length (X0) deep sampling calorimeter. The calorimeter is comprised of 20 layers of tungsten interleaved with 20 layers of scintillating fiber ribbons, and is preceded by a pair of graphite interaction targets providing about 0.42 proton interaction lengths (\\lambda int). The calorimeter was placed in one of CERN's SPS accelerator beams for calibration and testing. Beams of 150 GeV electrons were used for calibration, and a variety of electron, proton, and nuclear fragment beams were used to test the simulation model of the detector. In this paper we discuss the performance of the calorimeter in the electron beam and compare electron beam data with simulation results.

  15. Electric Polarizability of Hadrons

    E-print Network

    Joe Christensen; Frank X. Lee; Walter Wilcox; Leming Zhou

    2002-09-03

    The electric polarizability of a hadron allows an external electric field to shift the hadron mass. We try to calculate the electric polarizability for several hadrons from their quadratic response to the field at a=0.17fm using an improved gauge field and the clover quark action. Results are compared to experiment where available.

  16. CALET: A calorimeter-based orbital observatory for High Energy Astroparticle Physics

    NASA Astrophysics Data System (ADS)

    Marrocchesi, P. S.; Calet Collaboration

    2012-11-01

    CALET is an advanced experiment that will be installed on the Exposure Facility of the Japanese Experiment Module (JEM-EF) on the International Space Station (ISS) with a launch window in 2014. The instrument consists of three main sub-systems: a charge module using plastic scintillators to identify the charge of the particle, a thin imaging calorimeter (3X0) with tungsten plates interleaving scintillating fiber planes, and a thick calorimeter (27X0) composed of lead tungstate logs. It has sufficient depth, imaging capabilities and excellent energy resolution to allow for a clear separation between hadrons and electrons and between charged particles and gamma-rays. The charge module will be able to identify cosmic nuclei from H through Fe as well as trans-Fe elements at least up to Zr (Z=40). With extended observations, over a period of 5 years, CALET will be able to unveil the presence of possible nearby sources of high energy electrons, study the details of particle propagation in the galaxy and search for signatures of dark matter. In this paper, we will review the main features of the CALET instrument and the present status of the mission.

  17. Removal of nutrient and pesticides from tile drainage discharge using an end-of-tile cartridge approach

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Nutrient transport from subsurface tile drainage is pretty well documented. One approach receiving consideration for reducing the amount of nutrients and pesticides in subsurface drainage waters is end-of-tile filters. The filters are often comprised of industrial wastes or by-products that have a s...

  18. Research and Development for a Free-Running Readout System for the ATLAS LAr Calorimeters at the High Luminosity LHC

    E-print Network

    Hils, Maximilian; The ATLAS collaboration

    2015-01-01

    The ATLAS Liquid Argon (LAr) Calorimeters were designed and built to measure electromagnetic and hadronic energy in proton-proton collisions produced at the LHC at centre-of-mass energies up to 14 TeV and instantaneous luminosities up to $10^{34} \\text{cm}^{-2} \\text{s}^{-1}$. The High Luminosity LHC (HL-LHC) programme is now developed for up to 5-7 times the design luminosity, with the goal of accumulating an integrated luminosity of $3000~\\text{fb}^{-1}$. In the HL-LHC phase, the increased radiation levels require a replacement of the front-end electronics of the LAr Calorimeters. Furthermore, the ATLAS trigger system is foreseen to increase the trigger accept rate by a factor 10 to 1 MHz and the trigger latency by a factor of 20 which requires a larger data volume to be buffered. Therefore, the LAr Calorimeter read-out will be exchanged with a new front-end and a high bandwidth back-end system for receiving data from all 186.000 channels at 40 MHz LHC bunch-crossing frequency and for off-detector buffering...

  19. Triangular dissections, aperiodic tilings and Jones algebras

    E-print Network

    R. Coquereaux

    1995-03-27

    The Brattelli diagram associated with a given bicolored Dynkin-Coxeter graph of type $A_n$ determines planar fractal sets obtained by infinite dissections of a given triangle. All triangles appearing in the dissection process have angles that are multiples of $\\pi/ (n+1).$ There are usually several possible infinite dissections compatible with a given $n$ but a given one makes use of $n/2$ triangle types if $n$ is even. Jones algebra with index $[ 4 \\ \\cos^2{\\pi \\over n+1}]^{-1}$ (values of the discrete range) act naturally on vector spaces associated with those fractal sets. Triangles of a given type are always congruent at each step of the dissection process. In the particular case $n=4$, there are isometric and the whole structure lead, after proper inflation, to aperiodic Penrose tilings. The ``tilings'' associated with other values of the index are discussed and shown to be encoded by equivalence classes of infinite sequences (with appropriate constraints) using $n/2$ digits (if $n$ is even) and generalizing the Fibonacci numbers.

  20. GEANT SIMULATIONS OF PRESHOWER CALORIMETER FOR CLAS12 UPGRADE OF THE FORWARD ELECTROMAGNETIC CALORIMETER

    SciTech Connect

    Whitlow, K.; Stepanyan, S.

    2007-01-01

    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 simulations will be undertaken to verify that the four-module version has acceptable ?° mass reconstruction and to continue Research and Development (R&D) analysis on the preshower calorimeter.

  1. High energy hadron-hadron collisions

    SciTech Connect

    Chou, T.T.

    1990-11-01

    Results of a study on high energy collision with the geometrical model are summarized in three parts: (i) the elastic hadron-hadron collision, (ii) the inelastic hadron-hadron collision, and (iii) the e{sup +}e{sup {minus}} annihilation. For elastic collisions, a simple expression for the proton matter distribution is proposed which fits well the elastic {bar p}p scattering from ISR to S{bar p}pS energies within the geometrical model. The proton form factor is of the dipole form with an energy-dependent range parameter. The {bar p}p elastic differential cross section at Tevatron energies obtained by extrapolation is in good agreement with experiments. For multiparticle emission processes a unified physical picture for hadron-hadron and e{sup +}e{sup {minus}} collisions was proposed. A number of predictions were made, including the one that KNO-scaling does not obtain for e{sup +}e{sup {minus}} two-jet events. An extension of the considerations within the geometrical model led to a theory of the momentum distributions of the outgoing particles which are found in good agreement with current experimental data. Extrapolations of results to higher energies have been made. The cluster size of hadrons produced in e{sup +}e{sup {minus}} annihilation is found to increase slowly with energy.

  2. Combined Liquid Xenon and crystal CsI calorimeter of the CMD-3 detector

    NASA Astrophysics Data System (ADS)

    Shebalin, V. E.; Anisenkov, A. V.; Bashtovoy, N. S.; Epifanov, D. A.; Erofeev, A. L.; Grebenuk, A. A.; Karpov, S. V.; Khazin, B. I.; Kovalenko, O. A.; Kozyrev, A. N.; Kuzmin, A. S.; Mikhailov, K. Yu; Razuvaev, G. P.; Ruban, A. A.; Shwartz, B. A.; Titov, V. M.; Talyshev, A. A.; Yudin, Yu V.

    2014-10-01

    The barrel electromagnetic calorimeter of the CMD-3 detector consists of two subsystems: the Liquid Xenon calorimeter and the calorimeter based on CsI scintillation crystals. Its structure and main characteristics are presented. The energy calibration procedures of the combined calorimeter are described.

  3. Research on detection system of ceramic tile based on image processing

    Microsoft Academic Search

    Bo You; Chao Yan; Ming Qiao; Jiazhong Xu

    2009-01-01

    In order to realize the automatic detection of exterior wall ceramic tile and the automatic classification of the product quality, the exterior wall ceramic tile automatic detection system based on the image acquisition and processing technology is designed. Aiming at the characteristics of small volume, large quantity and random position distribution of tile, the automatic tile detection system based on

  4. Introduction/Background Tiling to soccer ball Group theory Further questions Higher Genus Soccer Balls

    E-print Network

    Broughton, S. Allen

    Introduction/Background Tiling to soccer ball Group theory Further questions Higher Genus Soccer;Introduction/Background Tiling to soccer ball Group theory Further questions Outline 1 Introduction/Background Credits Why soccer balls? Kaleidoscopic tilings 2 Tiling to soccer ball Cayley Graph Construction

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

    SciTech Connect

    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

    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.

  6. Search for Heavy Resonances Decaying to Taus in 7 TeV Proton-Proton Collisions at the Large Hadron Collider 

    E-print Network

    Gurrola, Alfredo

    2011-10-21

    : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 11 3. MOTIVATION FOR Z 0 BOSONS : : : : : : : : : : : : : : : : : : : : : : : 14 4. HIGH MASS RESONANCES DECAYING TO TAU PAIRS : : : : : : : : 17 5. THE LARGE HADRON COLLIDER : : : : : : : : : : : : : : : : : : : : : 23 6. THE CMS DETECTOR....3.1 The Pixel Detector : : : : : : : : : : : : : : : : : : : : : : : : 34 6.3.2 The Silicon Strip Detector : : : : : : : : : : : : : : : : : : : : 35 6.4 The Muon System : : : : : : : : : : : : : : : : : : : : : : : : : : : : 35 6.5 Calorimeters...

  7. Fractal dimension analysis in a highly granular calorimeter

    E-print Network

    Ruan, M; Brient, J.C; Jeans, D; Videau, H

    2015-01-01

    The concept of “particle flow” has been developed to optimise the jet energy resolution by distinguishing the different jet components. A highly granular calorimeter designed for the particle flow algorithm provides an unprecedented level of detail for the reconstruction of calorimeter showers and enables new approaches to shower analysis. In this paper the measurement and use of the fractal dimension of showers is described. The fractal dimension is a characteristic number that measures the global compactness of the shower. It is highly dependent on the primary particle type and energy. Its application in identifying particles and estimating their energy is described in the context of a calorimeter designed for the International Linear Collider.

  8. Influence of microwave-annealing on the mechanical properties of alumina tiles

    SciTech Connect

    Kass, M.D.; Akerman, M.A.; Baity, F.W. Jr.; Lowden, R.A. [Oak Ridge National Lab., TN (United States)] [and others

    1995-12-31

    Fully dense alumina armor tiles were annealed at 1400{degrees}C for one hour using microwave radiation at 28 GHz. Ultrasonic measurements showed that the acoustic impedances, and Young`s moduli of the post-annealed tiles were higher than for unannealed tiles. The post-annealed tiles also exhibited higher hardness values and improved armor performance. Microstructure analysis indicated that the grain boundary regions of the tiles were affected by the microwave heating.

  9. Rising Total Hadron-Hadron Cross Sections

    E-print Network

    Giorgio Giacomelli

    2007-12-06

    A historical summary is made on the measurements concerning the rising total hadron-hadron cross sections at high energies. The first part of this paper concerns the total cross section measurements performed at the Brookhaven, Serpukhov and Fermilab fixed target accelerators; then the measurements at the CERN Intersecting Storage Rings (ISR), and at the CERN and at the Tevatron Fermilab proton-antiproton colliders; finally the cosmic ray measurements at even higher energies. A short discussion on Conclusions and Perspectives follows.

  10. Measurement of plasma flows into tile gaps

    NASA Astrophysics Data System (ADS)

    Dejarnac, R.; Komm, M.; Stöckel, J.; Panek, R.

    2008-11-01

    Particle fluxes falling into narrow gaps are of high interest since international thermonuclear experimental reactor plasma facing components will be castellated. In order to investigate the plasma deposition in gaps between tiles, we have developed a special probe that recreates a gap and that can measure the ion saturation current profiles along its both sides. Measurements were performed in the tokamak Czech Academy of Sciences TORus and are compared with a self-consistent kinetic model. The simulations reproduce well the observed asymmetry of the plasma deposition in both poloidal and toroidal gaps and the intensity of the collected currents is well-estimated. However, the agreement is less perfect for poloidal gaps due to the presence of a positive peak on the negative potential inside the gap. Therefore, the plasma deposition does not decay exponentially like in toroidal gaps. Nevertheless, this unique set of experiments confirms globally the results of our model.

  11. Floor tile and mastic removal project report

    SciTech Connect

    Not Available

    1992-11-01

    A test program was developed and coordinated with State and Federal Regulators and carried out at Fort Sill, Oklahoma. This program was carefully designed to create the worst conditions in order to evaluate whether asbestos fibers are released when asbestos containing floor tile and mastic are removed. There were over 1,000 samples taken and analyzed during the execution of the program. The conclusions reached were based upon analysis of the critical samples using the Transmission Electron Microscope (TEM) technology. Additionally, the TEM procedures were used to evaluate personnel samples to determine whether those fibers found were asbestos or other materials. Most of the (TEM) samples were analyzed by the US Environmental Protection Agency (EPA) Risk Reduction Engineering Laboratory in Cincinnati, Ohio.

  12. Direct hadron production in hadronic collisions Francois Arleoa,

    E-print Network

    Paris-Sud XI, Université de

    Direct hadron production in hadronic collisions Franc¸ois Arleoa, , Stanley J. Brodskyb,c , Dae investigate the scaling properties of large-p hadron, jet and prompt photon production in hadronic collisions by comparing systematically world data to NLO QCD predictions. In the hadron sector a significant discrepancy

  13. Beta spectrometry with metallic magnetic calorimeters.

    PubMed

    Loidl, M; Rodrigues, M; Le-Bret, C; Mougeot, X

    2014-05-01

    Metallic magnetic calorimeters are a specific type of cryogenic detectors that have been shown to enable precise measurement of the shape of low energy beta spectra. The aim of their use at LNHB is the determination of the shape factors of beta spectra. The beta source is enclosed in the detector absorber, allowing for very high detection efficiency. It has turned out that the type of source is of crucial importance for the correctness of the measured spectrum. Spectra of (63)Ni measured with several sources prepared by drying a NiCl2 solution differ from one another and from theory, whereas spectra measured with electroplated sources are reproducible and agree with theory. With these latter measurements we could confirm the atomic exchange effect down to very low energy (200 eV). PMID:24368065

  14. A particle counting EM calorimeter using MAPS

    NASA Astrophysics Data System (ADS)

    Nooren, G.; Rocco, E.

    2015-02-01

    The availability of full size MAPS sensors makes it possible to construct a calorimeter with pixelsize of a few tens of micrometers. This would be small enough to count individual shower particles and would allow a shower shape analysis on an unprecedented, small scale. Interesting features would be tracking capability for particle flow algorithms and a superior discrimination of single photons from neutral and charged pions at high momenta. A small Molière radius together with high transverse resolution would allow to separate close showers, induced by photons from neutral pion decay. A full scale (4 RM, 28 X0) prototype was constructed to demonstrate this. It features 30 micron pixelsize and a longitudinal sampling at 1 radiation length. We will show results from beam tests of this prototype at electron energies of 2 to 200 GeV.

  15. Interference Heating to Cavities Between Simulated RSI Tiles

    NASA Technical Reports Server (NTRS)

    Johnson, C. B.

    1973-01-01

    Test results for full scale simulated surface insulation tiles on both the tunnel wall and in the free stream, for in-line and staggered tile orientations, are summarized as follows: (1) The staggered tile orientation has heating on the forward face which is a factor of 4.5 times higher than the heating to the forward face of the in-line tile orientation; (2) the longitudinal gap heating was the highest for the 0.3175 cm gap and the lowest for the 0.1587 cm gap; and (3) there was an order of magnitude decrease in the heating on the forward face of a spanwise gap when the gap size was decreased from 0.3175 cm to 0.1587 cm.

  16. VIEW OF COMPASS ROSE TILE INLAY IN FLOOR OF LOBBY, ...

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

    VIEW OF COMPASS ROSE TILE INLAY IN FLOOR OF LOBBY, BUILDING 1, LOOKING SOUTHEAST - Roosevelt Base, Administration & Brig Building, Bounded by Nevada & Colorado Streets, Reeves & Richardson Avenues, Long Beach, Los Angeles County, CA

  17. 25. CAFETERIA Note remains of tile floor in foreground. Food ...

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

    25. CAFETERIA Note remains of tile floor in foreground. Food cooked on the stove was served to workers in the eating area to the left of the counter (off picture). - Hovden Cannery, 886 Cannery Row, Monterey, Monterey County, CA

  18. Measurement of Tritium Surface Distribution on TFTR Bumper Limiter Tiles

    NASA Astrophysics Data System (ADS)

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

    The tritium surface distribution on graphite tiles used in the TFTR bumper limiter and exposed to TFTR 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.

  19. 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

  20. Remote handling system development of armor tile replacement for FER

    SciTech Connect

    Adachi, J.; Yoshizawa, S.; Nakano, Y. [Kawasaki Heavy Industries, Ltd., Tokoyo (Japan)] [and others

    1994-12-31

    A number of armor tiles are attached to the first wall of the Fusion Experimental Reactor (FER) in order to protect the first wall against severe heat/particle loads from plasma during its operation. Although the armor tiles are made of heat-resisting materials such as graphite, they are eroded and damaged due to the loads and thus they are categorized into scheduled maintenance component. A remote handling system is required to replace a large number of tiles rapidly in the highly activated circumstance and has to be capable for adjusting a manipulator`s motion taking into account a thermal deformation of the first wall and/or a positioning error of a manipulator for the remote handling system. For this purpose, a remote handling system of the armor tile replacement with a visual feedback control has been fabricated and this paper describes an experimental system and the performance test results.

  1. Basic Structure in Hadrons

    E-print Network

    Firooz Arash; Ali N. Khorramian

    2001-05-24

    We have calculated the Structure function a constituent quark in the NLO and from it we have derived the structure functions of hadrons. We found that perturbative generation of hadron structure falls short of conforming with data by a few percent. This is due to the presence of soft gluon and its radiation in the hadron. This contribution is modeled into our calculations. It is also responsible for the breaking of flavor symmetry in the nucleon sea.

  2. Hadrons in Medium

    E-print Network

    U. Mosel

    2005-05-04

    In these lectures I first give a motivation for investigations of in-medium properties of hadrons. I discuss the relevant symmetries of QCD and how they might affect the observed hadron properties. I then discuss at length the observable consequences of in-medium changes of hadronic properties in reactions with elementary probes, and in particular photons, on nuclei. Here I put an emphasis on new experiments on changes of the sigma and omega mesons in medium.

  3. Hadron Physics at FAIR

    SciTech Connect

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

    2011-10-24

    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.

  4. Realtime calibration of the A4 electromagnetic lead fluoride calorimeter

    E-print Network

    S. Baunack; D. Balaguer Ríos; L. Capozza; J. Diefenbach; R. Frascaria; B. Gläser; D. v. Harrach; Y. Imai; R. Kothe; R. Kunne; J. H. Lee; F. E. Maas; M. C. Mora Espí; M. Morlet; S. Ong; E. Schilling; J. van de Wiele; C. Weinrich

    2011-02-28

    Sufficient energy resolution is the key issue for the calorimetry in particle and nuclear physics. The calorimeter of the A4 parity violation experiment at MAMI is a segmented calorimeter where the energy of an event is determined by summing the signals of neighbouring channels. In this case the precise matching of the individual modules is crucial to obtain a good energy resolution. We have developped a calibration procedure for our total absorbing electromagnetic calorimeter which consists of 1022 lead fluoride (PbF_2) crystals. This procedure reconstructs the the single-module contributions to the events by solving a linear system of equations, involving the inversion of a 1022 x 1022-matrix. The system has shown its functionality at beam energies between 300 and 1500 MeV and represents a new and fast method to keep the calorimeter permanently in a well-calibrated state.

  5. Holographic model of hadronization.

    PubMed

    Evans, Nick; Tedder, Andrew

    2008-04-25

    We study hadronization of the final state in a particle-antiparticle annihilation using a holographic gravity dual description of QCD. At the point of hadronization we match the events to a simple (Gaussian) energy distribution in the five dimensional theory. The final state multiplicities are then modeled by calculating the overlap between the Gaussian and a set of functions in the fifth dimension which represent each hadron. We compare our results to those measured in e(+)e(-) collisions. Hadron production numbers over a range of 4 orders of magnitude are reproduced well. PMID:18518189

  6. Holographic Model of Hadronization

    SciTech Connect

    Evans, Nick; Tedder, Andrew [School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ (United Kingdom)

    2008-04-25

    We study hadronization of the final state in a particle-antiparticle annihilation using a holographic gravity dual description of QCD. At the point of hadronization we match the events to a simple (Gaussian) energy distribution in the five dimensional theory. The final state multiplicities are then modeled by calculating the overlap between the Gaussian and a set of functions in the fifth dimension which represent each hadron. We compare our results to those measured in e{sup +}e{sup -} collisions. Hadron production numbers over a range of 4 orders of magnitude are reproduced well.

  7. Mobilization and loss of elements from roofing tiles

    Microsoft Academic Search

    Fazrul Razman Sulaiman; Peter Brimblecombe; Carlota M. Grossi

    2009-01-01

    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,

  8. Parametrized tiling: Accurate approximations and analysis of global dependences

    NASA Astrophysics Data System (ADS)

    Bakhanovich, S. V.; Sobolevskii, P. I.

    2014-11-01

    Aspects of parametrized tiling as applied to algorithms whose computational domain can be represented as a convex polyhedron are studied. A method for constructing approximations to a set of tiles is developed, and necessary and sufficient conditions for their accuracy are stated. Formulas for determining intertile vectors are derived. A formal representation of iteration sets generating such vectors is obtained in the form of polyhedra with explicitly expressed boundaries.

  9. Phason disorder effects in the Penrose tiling antiferromagnet

    Microsoft Academic Search

    Attila Szallas; Anuradha Jagannathan

    2009-01-01

    We discuss the ground state of a disordered two dimensional Heisenberg\\u000aantiferromagnet. The starting structure is taken to be a perfectly\\u000adeterministic quasiperiodic tiling, and the type of disorder we consider is\\u000ageometric, involving frozen phason flips of a randomly selected subset of\\u000asites. We consider S=1\\/2 quantum spins placed on the vertices of the tiling,\\u000aand interacting with the

  10. On the Minimum Weight Steiner Triangular Tiling problem

    SciTech Connect

    Doddi, S.; Zhu, B.

    1995-04-01

    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.

  11. Tile Size Selection Using Cache Organization and Data Layout

    Microsoft Academic Search

    Stephanie Coleman; Kathryn S. McKinley

    1995-01-01

    When dense matrix computations are too large to fit in cache, previous research proposes tiling to reduce or elim- inate capacity misses. This paper presents a new algorithm for choosing problem-size dependent tile sizes based on the cache size and cache line size for a direct-mapped cache. The algorithm eliminates both capacity and self-interference misses and reduces cross-interference misses. We

  12. A cryogenic dose calorimeter for pulsed radiographic accelerators

    SciTech Connect

    Watson, S.A.; Kauppila, T.; Mueller, K.H.

    1994-10-01

    Calorimetry is the most direct, absolute technique for absorbed dose measurements. To improve the measurement accuracy for use with quantitative radiography, a calorimeter has been developed for LANL`s pulsed radiographic machines which produce Bremsstrahlung radiation fields of 50-200 Rad per pulse at 1 meter from the source. This paper describes the theory of operation, the calorimeter design, and presents results from the PHERMEX accelerator.

  13. Beam tests of the DØ uranium liquid argon end calorimeters

    Microsoft Academic Search

    S. Abachi; M. Abolins; H. Aihara; N. Amos; Y. Antipov; S. H. Aronson; R. Astur; R. Avellaneda; R. E. Avery; A. R. Baden; B. Baldin; J. Bantly; E. Barasch; J. F. Bartlett; K. Bazizi; T. Behnke; V. Bezzubov; P. Bhat; G. C. Blazey; S. Blessing; D. Bogert; F. Borcherding; J. Borders; N. Bozko; R. Brock; A. D. Bross; D. Buchholz; N. Bulgakov; V. Burtovoy; J. M. Butler; R. Cence; S. Chekulaev; S. Cherny; J. Chen; J. H. Christenson; A. R. Clark; J. Cochran; W. E. Cooper; C. Cretsinger; D. Cullen-Vidal; D. Cutts; O. I. Dahl; A. Davidenko; K. de; M. Demarteau; D. Denisov; S. Denisov; W. Dharmaratna; H. T. Diehl; M. Diesburg; R. Dixon; P. Draper; Y. Ducros; G. Dugan; S. Durston; A. Dyakonenkov; D. Eartly; D. Edmunds; A. Efimov; J. Ellison; R. Engelmann; O. Eroshin; V. Evdokimov; S. Fahey; M. Fatyga; J. Featherly; S. Feher; T. Ferbel; D. Finley; G. Finocchiaro; H. E. Fisk; G. E. Forden; M. Fortner; P. Franzini; S. Fuess; C. S. Gao; T. Geld; K. Genser; B. G. Gibbard; V. Glebov; J.-F. Glicenstein; B. Gobbi; M. Goforth; M. L. Good; H. A. Gordon; N. Graf; P. D. Grannis; D. R. Green; J. Green; H. Greenlee; P. Grudberg; J. A. Guida; J. M. Guida; W. Guryn; N. J. Hadley; H. Haggerty; S. Hagopian; R. Hall; D. Hedin; T. Heuring; R. Hirosky; J. Hoftun; J. F. Hubbard; T. Huehn; R. Huson; S. Igarashi; A. S. Ito; M. E. Johnson; A. M. Jonckheere; K. Johns; H. Jostlein; W. Karsh; S. Kahn; A. Kernan; L. Kerth; A. Kholodenko; A. Kirunin; E. Kistenev; A. Klatchko; B. Klima; B. Klochkov; C. Klopfenstein; V. Klyukhin; V. Kochetkov; W. Kononenko; J. Kotcher; I. Kotov; J. Kourlas; E. Kozlovsky; S. Kunori; S. Krzywdzinzski; R. Lanou; P. Laurens; J. Lee-Franzini; R. Li; Q. Z. Li-Demarteau; J. T. Linnemann; S. L. Linn; R. Lipton; F. Lobkowicz; S. C. Loken; S. Lökös; P. Lucas; R. J. Madaras; R. Madden; E. Malamud; Ph. Mangeot; B. Mansoulié; I. Manning; H.-S. Mao; T. Marshall; P. S. Martin; H. J. Martin; M. Marx; A. Mayorov; R. McCarthy; J. McKinley; X. C. Meng; K. W. Merritt; A. Milder; A. Mincer; P. Mooney; R. Morphis; M. Mudan; C. T. Murphy; F. Nang; V. S. Narasimham; H. A. Neal; P. Nemethy; D. Nesic; K. Ng; D. Norman; L. Oesch; E. Oltman; N. Oshima; D. L. Owen; D. P. Owen; R. Partridge; M. Paterno; A. Peryshkin; M. Peters; B. Pi; H. Piekarz; Y. Pischalnikov; D. Pizzuto; V. Platonov; A. Pluquet; V. Podstavkov; B. G. Pope; H. Prosper; S. Protopopescu; R. Raja; S. Rajagopalan; L. Rasmussen; A. L. Read; T. M.-L. Ren; S. Repond; V. Riadovikov; M. Rijssenbeek; N. A. Roe; P. Rubinov; R. Ruland; J. Rutherfoord; R. D. Schamberger; J. Sculli; W. Selove; A. Shkurenkov; M. Shupe; W. Smart; D. Smith; R. P. Smith; G. R. Snow; A. L. Spadafora; R. Stephens; M. L. Stevenson; C. Stewart; F. Stocker; D. Stoyanova; K. Streets; M. Strovink; A. Suhanov; A. Taketani; M. Tartaglia; J. Teiger; G. Theodosiou; J. Thompson; S. Tisserant; T. G. Trippe; P. M. Tuts; R. van Berg; A. Vorobiev; H. D. Wahl; H. Weerts; W. A. Wenzel; A. P. White; J. T. White; S. Willis; J. A. Wightman; S. J. Wimpenny; Z. Wolf; J. Womersley; Y. Xia; P. Xie; H. Xu; J. Xu; R. Yamada; P. Yamin; M.-J. Yang; C. Yoshikawa; S. Youssef; J. Yu; R. Zeller; Y. H. Zhou; Q. Zhu; D. Zieminska; A. Zieminski; A. Zotov; A. Zylberstejn

    1993-01-01

    We describe the results of beam tests of three uranium-liquid argon calorimeter modules constructed for the DØ detector at the Fermilab Tevatron collider. As part of the calibration procedure, these modules were exposed to beams of electrons, pions and muons between 10 and 150 GeV\\/c before their installation in the end calorimeter of the completed DØ detector. We obtain an

  14. The electromagnetic calorimeter in JLab Real Compton Scattering Experiment

    SciTech Connect

    Albert Shahinyan; Eugene Chudakov; A. Danagoulian; P. Degtyarenko; K. Egiyan; V. Gorbenko; J. Hines; E. Hovhannisyan; Ch. Hyde; C.W. de Jager; A. Ketikyan; V. Mamyan; R. Michaels; A.M. Nathan; V. Nelyubin; I. Rachek; M. Roedelbrom; A. Petrosyan; R. Pomatsalyuk; V. Popov; J. Segal; Yu. Shestakov; J. Templon; H. Voskanyan; B. Wojtsekhowski

    2007-04-16

    A hodoscope calorimeter comprising of 704 lead-glass blocks is described. The calorimeter was constructed for use in the JLab Real Compton Scattering experiment. The detector provides a measurement of the coordinates and the energy of scattered photons in the GeV energy range with resolutions of 5 mm and 6\\%/$\\sqrt{E_\\gamma \\, [GeV]}$, respectively. Design features and performance parameters during the experiment are presented.

  15. Construction, calibration and testing of a micro-combustion calorimeter

    Microsoft Academic Search

    E. Adriana Camarillo; Henoc Flores

    2006-01-01

    An isoperibolic micro-combustion calorimeter was designed, built and set up in our laboratory, taking as base a 1107 Parr combustion bomb of 22cm3 of volume. Taken into account the geometrical form of the bomb, it was designed and constructed a vessel and a submarine chamber in brass. All of the pieces of the calorimeter were chromium-plated to reduce heat loss

  16. Exploring Excited Hadrons

    E-print Network

    Colin Morningstar

    2008-10-24

    Progress in extracting the spectrum of excited hadron resonances is reviewed and the key issues and challenges in such computations are outlined. The importance of multi-hadron states as simulations are done with lighter pion masses is discussed, and the need for all-to-all quark propagators is emphasized.

  17. Very large hadron colliders

    NASA Astrophysics Data System (ADS)

    Harrison, Mike

    1997-03-01

    Design and cost issues concerning the future (post Large Hadron Collider) Very Large Hadron Colliders (VLHC) are discussed. The basic accelerator concept is similar to current machines: long repetitive arcs in a 2-in-1 magnet scheme with a few interaction regions encompassing the experimental regions and accelerator facilities. A cost goal of 50 million dollars per TeV is discussed. (AIP)

  18. Foam on Tile Impact Modeling for the STS-107 Investigation

    NASA Technical Reports Server (NTRS)

    Stellingwerf, R. F.; Robinson, J. H.; Richardson, S.; Evans, S. W.; Stallworth, R.; Hovater, M.

    2004-01-01

    Following the breakup of the Space Shuttle Columbia during reentry a NASA/Contractor investigation team was formed to examine the probable damage inflicted on Orbiter Thermal Protection System elements by impact of External Tank insulating foam projectiles. The authors formed a working subgroup within the larger team to apply the Smooth Particle Hydrodynamics code SPHC to the damage estimation problem. Numerical models of the Orbiter's tiles and of the Tank's foam were constructed and used as inputs into the code. Material properties needed to properly model the tiles and foam were obtained from other working subgroups who performed tests on these items for this purpose. Two- and three-dimensional models of the tiles were constructed, including the glass outer layer, the main body of LI-900 insulation, the densified lower layer of LI-900, the Nomex felt mounting layer, and the Aluminum 2024 vehicle skin. A model for the BX-250 foam including porous compression, elastic rebound, and surface erosion was developed. Code results for the tile damage and foam behavior were extensively validated through comparison with Southwest Research Institute foam-on-tile impact experiments carried out in 1999. These tests involved small projectiles striking individual tiles and small tile arrays. Following code and model validation we simulated impacts of larger foam projectiles on the examples of tile systems used on the Orbiter. Results for impacts on the main landing gear door are presented in this paper, including effects of impacts at several angles, and of rapidly rotating projectiles. General results suggest that foam impacts on tiles at about 500 mph could cause appreciable damage if the impact angle is greater than about 20 degrees. Some variations of the foam properties, such as increased brittleness or increased density could increase damage in some cases. Rotation up to 17 rps failed to increase the damage for the two cases considered. This does not rule out other cases in which the rotational energy might lead to an increase in tile damage, but suggests that in most cases rotation will not be an important factor.

  19. Phase change material in floor tiles for thermal energy storage

    NASA Astrophysics Data System (ADS)

    Lee, Amy Sarah

    Traditional passive solar systems have relied on sensible heat storage for energy savings. Recent research has investigated taking advantage of latent heat storage for additional energy savings. This is accomplished by the incorporation of phase change material into building materials used in traditional passive applications. Trombe walls, ceilings and floors can all be enhanced with phase change materials. This research introduces a new flooring material that incorporates a phase change material ready for commercial manufacture. An agglomerate floor tile containing 20% by mass of encapsulated octadecane has been manufactured. Flexural and compressive strength of 7.4 MPa and 24.5 MPa respectively, were measured for the tile. Peak melting transition temperature was determined to be 27.2°C with a latent heat of 33.9 J/g of tile. Structural and thermal performance of the tile surpassed that of a typical ceramic tile. Each tile was composed of quartz, resin and phase change material. Statistical modeling was performed to analyze the response of flexural and compressive strength on varying amounts of quartz, resin and phase change material. Resulting polynomials described the effect of adding phase change material into the tile. With as little as 10% by mass of phase change material, the strength was reduced to less than 50% of tile without phase change material. It was determined that the maximum phase change material content to attain structural integrity greater than ceramic tile was 20% by mass. The statistical analysis used for this research was based on mixture experiments. A procedure was developed to simplify the selection of data points used in the fit of the polynomials to describe the response of flexural and compressive strengths. Analysis of energy savings using this floor tile containing 20% by mass of phase change material was performed as an addendum to this research. A known static simulation method, SLR (solar load ratio), was adapted to include latent heat storage. In addition a dynamic simulation was also performed using BLAST. The program had to be modified to simulate latent heat storage. Annual heating consumptions from both methods were estimated to be reduced by approximately 5%.

  20. Construction of 2D quasi-periodic Rauzy tiling by similarity transformation

    SciTech Connect

    Zhuravlev, V. G.; Maleev, A. V., E-mail: andr_mal@mail.ru [Vladimir State Humanitarian University (Russian Federation)

    2009-05-15

    A new approach to constructing self-similar fractal tilings is proposed based on the construction of semigroups generated by a finite set of similarity transformations. The Rauzy tiling-a 2D analog of 1D Fibonacci tiling generated by the golden mean-is used as an example to illustrate this approach. It is shown that the Rauzy torus development and the elementary fractal boundary of Rauzy tiling can be constructed in the form of a set of centers of similarity semigroups generated by two and three similarity transformations, respectively. A centrosymmetric tiling, locally dual to the Rauzy tiling, is constructed for the first time and its parameterization is developed.

  1. Hadronization via Recombination

    E-print Network

    Kang Seog Lee; Steffen Bass; Berndt Mueller; Chiho Nonaka

    2008-12-27

    The recombination model as a model for hadronization from a quark-gluon plasma has been recently revived since it has advantages in explaining several important features of the final state produced in heavy-ion collisions at RHIC, such as the constituent quark number scaling of the elliptic coefficient versus the transverse energy of identified hadrons, the bending shape of the $p_T$ spectrum of hadrons near 5 GeV/c, and the measured large value of baryon to meson ratio(of the order of unity) in the same $p_T$ range. We have developed a dynamic simulation model of heavy-ion collisions in which a quark-gluon plasma, starting from a certain initial condition, evolves hydrodynamically until it reaches the phase boundary, and then hadronizes by valence quark recombination. Rescattering after hadronization is described by UrQMD. We discuss some details of the model and report first, preliminary results.

  2. Are Tiled Display Walls Needed for Astronomy?

    NASA Astrophysics Data System (ADS)

    Meade, Bernard F.; Fluke, Christopher J.; Manos, Steven; Sinnott, Richard O.

    2014-08-01

    Clustering commodity displays into a Tiled Display Wall (TDW) provides a cost-effective way to create an extremely high resolution display, capable of approaching the image sizes now generated by modern astronomical instruments. Many research institutions have constructed TDWs on the basis that they will improve the scientific outcomes of astronomical imagery. We test this concept by presenting sample images to astronomers and non-astronomers using a standard desktop display (SDD) and a TDW. These samples include standard English words, wide field galaxy surveys and nebulae mosaics from the Hubble telescope. Our experiments show that TDWs provide a better environment than SDDs for searching for small targets in large images. They also show that astronomers tend to be better at searching images for targets than non-astronomers, both groups are generally better when employing physical navigation as opposed to virtual navigation, and that the combination of two non-astronomers using a TDW rivals the experience of a single astronomer. However, there is also a large distribution in aptitude amongst the participants and the nature of the content also plays a significant role in success.

  3. Tiled fuzzy Hough transform for crack detection

    NASA Astrophysics Data System (ADS)

    Vaheesan, Kanapathippillai; Chandrakumar, Chanjief; Mathavan, Senthan; Kamal, Khurram; Rahman, Mujib; Al-Habaibeh, Amin

    2015-04-01

    Surface cracks can be the bellwether of the failure of any component under loading as it indicates the component's fracture due to stresses and usage. For this reason, crack detection is indispensable for the condition monitoring and quality control of road surfaces. Pavement images have high levels of intensity variation and texture content, hence the crack detection is difficult. Moreover, shallow cracks result in very low contrast image pixels making their detection difficult. For these reasons, studies on pavement crack detection is active even after years of research. In this paper, the fuzzy Hough transform is employed, for the first time to detect cracks on any surface. The contribution of texture pixels to the accumulator array is reduced by using the tiled version of the Hough transform. Precision values of 78% and a recall of 72% are obtaining for an image set obtained from an industrial imaging system containing very low contrast cracking. When only high contrast crack segments are considered the values move to mid to high 90%.

  4. ALT-II armor tile design for upgraded TEXTOR operation

    SciTech Connect

    Newberry, B.L. [Univ. of Michigan, Ann Arbor, MI (United States); McGrath, R.T.; Watson, R.D. [Sandia National Lab., Albuquerque, NM (United States)] [and others

    1994-12-31

    The upgrade of the TEXTOR tokamak at KFA Julich will be completed in the spring of 1994. The upgrade will extend the TEXTOR pulse length from 5 seconds to 10 seconds. The auxiliary heating systems are also scheduled to be upgraded so that eventually a total of 8.0 MW auxiliary heating will be available through a combination of neutral beam injection and radio frequency heating. Originally, the inertially cooled armor tiles on the full toroidal belt Advanced Limiter Test - II (ALT-II) were designed for 5-second operation with a total heating power of 6.0 MW. The upgrade of TEXTOR will increase the energy deposited per pulse onto ALT-II by more than 300%. Consequently, the graphite armor tiles for ALT-II had to be redesigned in order to increase their thermal inertia and, thereby, avoid excessively high graphite armor surface temperatures that would lead to unacceptable contamination of the plasma. The armor tile thermal inertia had been increase primarily by expanding the radial thickness of the tiles from 17 mm to 20 mm. This increase in radial tile dimension will reduce the overall pumping efficiency of the ALT-II pump limiter by about 30%. The final armor tile design was a compromise between increasing the power handling capability and reducing the particle exhaust efficiency of ALT-II. The reduction in exhaust efficiency is unfortunate, but could only be avoided by active cooling of the ALT-II armor tiles. The active cooling option was too complicated and expensive to be considered at this time.

  5. SUITABILITY OF A NEW CALORIMETER FOR EXOTIC MESON SEARCHES

    SciTech Connect

    Bookwalter, C.; Ostrovidov, A.; Eugenio, P.

    2007-01-01

    Exotic mesons, particles that have quantum numbers that are inaccessible to conventional quark-model mesons, are predicted by quantum chromodynamics (QCD), but past experiments seeking to identify exotic candidates have produced controversial results. The HyCLAS experiment (E04005) at Thomas Jefferson National Accelerator Facility (TJNAF) proposes the use of the Continuous Electron Beam Accelerator Facility (CEBAF) Large Acceptance Spectrometer (CLAS) in Hall B to study the photoproduction of exotic mesons. However, the base detector package at CLAS is not ideal for observing and measuring neutral particles, particularly at forward angles. The Deeply Virtual Compton Scattering (DVCS) experiment at TJNAF has commissioned a new calorimeter for detecting small-angle photons, but studies must be performed to determine its suitability for a meson spectroscopy experiment. The ?? system has been under especial scrutiny in the community as a source for potential exotics, so the new calorimeter’s ability at reconstructing these resonances must be evaluated. To achieve this, the invariant mass of showers in the calorimeter are reconstructed. Also, two electroproduction reaction channels analogous to photoproduction channels of interest to HyCLAS are examined in DVCS data. It is found that, while not ideal, the new calorimeter will allow access to additional reaction channels, and its inclusion in HyCLAS is warranted. Results in basic shower reconstruction show that the calorimeter has good effi ciency in resolving ?° decays, but its ? reconstruction is not as strong. When examining ep ? ep?°?, preliminary reconstruction of the ??° system shows faint signals in the a0(980) region. In the ep ? e n ?+ ? channel, preliminary reconstruction of the ??+ system gave good signals in the a0(980) and a2(1320) regions, but statistics were poor. While more analyses are necessary to improve statistics and remove background, these preliminary results support the claim that the DVCS calorimeter will be a valuable addition to CLAS for upcoming exotic meson searches in photoproduction.

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

    SciTech Connect

    Anderson, Jake; Whitmore, Juliana; /Fermilab

    2011-11-01

    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.

  7. Tube formulas and complex dimensions of self-similar tilings

    E-print Network

    Michel L. Lapidus; Erin P. J. Pearse

    2010-06-09

    We use the self-similar tilings constructed by the second author in "Canonical self-affine tilings by iterated function systems" to define a generating function for the geometry of a self-similar set in Euclidean space. This tubular zeta function encodes scaling and curvature properties related to the complement of the fractal set, and the associated system of mappings. This allows one to obtain the complex dimensions of the self-similar tiling as the poles of the tubular zeta function and hence develop a tube formula for self-similar tilings in \\$\\mathbb{R}^d$. The resulting power series in $\\epsilon$ is a fractal extension of Steiner's classical tube formula for convex bodies $K \\ci \\bRd$. Our sum has coefficients related to the curvatures of the tiling, and contains terms for each integer $i=0,1,...,d-1$, just as Steiner's does. However, our formula also contains terms for each complex dimension. This provides further justification for the term "complex dimension". It also extends several aspects of the theory of fractal strings to higher dimensions and sheds new light on the tube formula for fractals strings obtained in "Fractal Geometry and Complex Dimensions" by the first author and Machiel van Frankenhuijsen.

  8. Microwave versus conventional sintering of silicon carbide tiles

    SciTech Connect

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

    1997-05-07

    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.

  9. Analysis of Thick Sandwich Shells with Embedded Ceramic Tiles

    NASA Technical Reports Server (NTRS)

    Davila, Carlos G.; Smith, C.; Lumban-Tobing, F.

    1996-01-01

    The Composite Armored Vehicle (CAV) is an advanced technology demonstrator of an all-composite ground combat vehicle. The CAV upper hull is made of a tough light-weight S2-glass/epoxy laminate with embedded ceramic tiles that serve as armor. The tiles are bonded to a rubber mat with a carefully selected, highly viscoelastic adhesive. The integration of armor and structure offers an efficient combination of ballistic protection and structural performance. The analysis of this anisotropic construction, with its inherent discontinuous and periodic nature, however, poses several challenges. The present paper describes a shell-based 'element-layering' technique that properly accounts for these effects and for the concentrated transverse shear flexibility in the rubber mat. One of the most important advantages of the element-layering technique over advanced higher-order elements is that it is based on conventional elements. This advantage allows the models to be portable to other structural analysis codes, a prerequisite in a program that involves the computational facilities of several manufacturers and government laboratories. The element-layering technique was implemented into an auto-layering program that automatically transforms a conventional shell model into a multi-layered model. The effects of tile layer homogenization, tile placement patterns, and tile gap size on the analysis results are described.

  10. Simulations of a Thin Sampling Calorimeter with GEANT/FLUKA

    NASA Technical Reports Server (NTRS)

    Lee, Jeongin; Watts, John; Howell, Leonard; Rose, M. Franklin (Technical Monitor)

    2000-01-01

    The Advanced Cosmic-ray Composition Experiment for the Space Station (ACCESS) will investigate the origin, composition and acceleration mechanism of cosmic rays by measuring the elemental composition of the cosmic rays up to 10(exp 15) eV. These measurements will be made with a thin ionization calorimeter and a transition radiation detector. This paper reports studies of a thin sampling calorimeter concept for the ACCESS thin ionization calorimeter. For the past year, a Monte Carlo simulation study of a Thin Sampling Calorimeter (TSC) design has been conducted to predict the detector performance and to design the system for achieving the ACCESS scientific objectives. Simulation results show that the detector energy resolution function resembles a Gaussian distribution and the energy resolution of TSC is about 40%. In addition, simulations of the detector's response to an assumed broken power law cosmic ray spectra in the region where the 'knee' of the cosmic ray spectrum occurs have been conducted and clearly show that a thin sampling calorimeter can provide sufficiently accurate estimates of the spectral parameters to meet the science requirements of ACCESS. n

  11. Weibull model of Multiplicity Distribution in hadron-hadron collisions

    E-print Network

    Sadhana Dash; Basanta K. Nandi

    2014-09-19

    We introduce the Weibull distribution as a simple parametrization of charged particle multiplicities in hadron-hadron collisions at all available energies, ranging from ISR energies to the most recent LHC energies. In statistics, the Weibull distribution has wide applicability in natural processes involving fragmentation processes. This gives a natural connection to the available state-of-the-art models for multi-particle production in hadron hadron collisions involving QCD parton fragmentation and hadronization.

  12. School of Art & Design 3D Printing of Relief Forms onto Ceramic Tiles

    E-print Network

    Evans, Paul

    School of Art & Design 3D Printing of Relief Forms onto Ceramic Tiles Lead: Lharne Shaw 3D printing tile production. It will also assess the feasibility of introducing a 3D slip printing system into both

  13. 40 CFR 427.70 - Applicability; description of the asbestos floor tile subcategory.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...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...

  14. The Two-Handed Tile Assembly Model Is Not Intrinsically Universal

    E-print Network

    Demaine, Erik D.

    In this paper, we study the intrinsic universality of the well-studied Two-Handed Tile Assembly Model (2HAM), in which two “supertile” assemblies, each consisting of one or more unit-square tiles, can fuse together ...

  15. Tritium profiles in tiles from the first wall of fusion machines and techniques for their detritiation

    NASA Astrophysics Data System (ADS)

    Penzhorn, R.-D.; Bekris, N.; Hellriegel, W.; Noppel, H.-E.; Nägele, W.; Ziegler, H.; Rolli, R.; Werle, H.; Haigh, A.; Peacock, A.

    2000-06-01

    Tritium profiles on a TFTR graphite tile exposed to D-D plasmas and a JET graphite tile from the first tritium campaigns were examined by full combustion, thermogravimetry and thermal desorption. Combustion measurements revealed that >98.9% of the tritium is trapped in a layer <50 ?m thick, the remainder being spread throughout the tile. The tritium distribution on the tile surface is not homogeneous. A significant fraction resides in the gaps between tiles. Graphite disks from the plasma-exposed side of JET tiles heated up to 1100°C under a helium stream containing 0.1% hydrogen showed the highest tritium release rate at ˜850°C. The agreement between tritium measurements by full combustion and thermal release was reasonably good. Tritium on graphite tiles was released to >95% under a stream of moist air at about 400°C. A large fraction of tritium can be removed from the tile surface with adhesive tape.

  16. Automatic Counting of Tilings of Skinny Plane Regions Shalosh B. EKHAD and Doron ZEILBERGER

    E-print Network

    Zeilberger, Doron

    Automatic Counting of Tilings of Skinny Plane Regions Shalosh B. EKHAD and Doron ZEILBERGER of the inductive method. We make a start by using the C­finite ansatz to enumerate tilings of skinny place regions

  17. Automatic Counting of Tilings of Skinny Plane Regions Shalosh B. EKHAD and Doron ZEILBERGER

    E-print Network

    Zeilberger, Doron

    Automatic Counting of Tilings of Skinny Plane Regions Shalosh B. EKHAD and Doron ZEILBERGER of the inductive method. We make a start by using the C-finite ansatz to enumerate tilings of skinny place regions

  18. An automated data management/analysis system for space shuttle orbiter tiles. [stress analysis

    NASA Technical Reports Server (NTRS)

    Giles, G. L.; Ballas, M.

    1982-01-01

    An engineering data management system was combined with a nonlinear stress analysis program to provide a capability for analyzing a large number of tiles on the space shuttle orbiter. Tile geometry data and all data necessary of define the tile loads environment accessed automatically as needed for the analysis of a particular tile or a set of tiles. User documentation provided includes: (1) description of computer programs and data files contained in the system; (2) definitions of all engineering data stored in the data base; (3) characteristics of the tile anaytical model; (4) instructions for preparation of user input; and (5) a sample problem to illustrate use of the system. Description of data, computer programs, and analytical models of the tile are sufficiently detailed to guide extension of the system to include additional zones of tiles and/or additional types of analyses

  19. Simulation studies of hadron energy resolution as a function of iron plate thickness at INO-ICAL

    E-print Network

    Lakshmi S. Mohan; Anushree Ghosh; Moon Moon Devi; Daljeet Kaur; Sandhya Choubey; Amol Dighe; D. Indumathi; M. V. N. Murthy; Md. Naimuddin

    2015-03-11

    We report on a detailed simulation study of the hadron energy resolution as a function of the thickness of the absorber plates for the proposed Iron Calorimeter (ICAL) detector at the India-based Neutrino Observatory (INO). We compare the hadron resolutions obtained with absorber thicknesses in the range 1.5--8 cm for neutrino interactions in the energy range 2--15 GeV, which is relevant to hadron production in atmospheric neutrino interactions. We find that at lower energies, the thickness dependence of energy resolution is steeper than at higher energies, however there is a thickness-independent contribution that dominates at the lower thicknesses discussed in this work. As a result, the gain in hadron energy resolution with decreasing plate thickness is marginal. We present the results in the form of fits to a function with energy-dependent exponent.

  20. Effect of dead materials on calorimeter response and Monte Carlo simulation

    SciTech Connect

    Dharmaratna, W.G.D. (Florida State Univ., Tallahassee, FL (United States). Dept. of Physics)

    1992-01-01

    The D0 calorimeter system, cylindrical central calorimeter and two end calorimeters, is constructed with minimal cracks and dead regions in order to provide essentially hermetic coverage over the full solid angle. The effect of the existing few construction features which could perturb the uniformity of the calorimeter is studied in detail with beam tests. The results with the correction algorithms are presented. A comparison with the Monte Carlo simulation is made.

  1. Steep-Slope Assembly Testing of Clay and Concrete Tile With and Without Cool Pigmented Colors

    Microsoft Academic Search

    William A

    2005-01-01

    Cool color pigments and sub-tile venting of clay and concrete tile roofs significantly impact the heat flow crossing the roof deck of a steep-slope roof. Field measures for the tile roofs revealed a 70% drop in the peak heat flow crossing the deck as compared to a direct-nailed asphalt shingle roof. The Tile Roofing Institute (TRI) and its affiliate members

  2. Constructing Penrose-like tilings from a single prototile and the implications for quasicrystals

    NASA Astrophysics Data System (ADS)

    Jeong, Hyeong-Chai; Steinhardt, Paul J.

    1997-02-01

    We present two sets of rules for constructing quasiperiodic tilings that suggest a simpler structural model of quasicrystals and a more plausible explanation of why quasicrystals form. First, we show that quasiperiodic tilings can be constructed from a single prototile with matching rules which constrain the way that neighbors can overlap. Second, we show that maximizing the density of a certain cluster of fat and thin tiles can force a Penrose tiling without imposing the usual Penrose matching rules.

  3. New perspectives on forbidden symmetries, quasicrystals, and?Penrose?tilings

    PubMed Central

    Steinhardt, Paul?J.

    1996-01-01

    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 can be constructed from a single repeating cluster of atoms and that the rigid matching rules of Penrose tilings can be replaced by more physically plausible cluster energetics. The new concepts make the conditions for forming quasicrystals appear to be closely related to the conditions for forming periodic crystals. PMID:8962037

  4. Entropically stabilized growth of a two-dimensional random tiling

    NASA Astrophysics Data System (ADS)

    Stannard, Andrew; Blunt, Matthew O.; Beton, Peter H.; Garrahan, Juan P.

    2010-10-01

    The assembly of molecular networks into structures such as random tilings and glasses has recently been demonstrated for a number of two-dimensional systems. These structures are dynamically arrested on experimental time scales, so the critical regime in their formation is that of initial growth. Here, we identify a transition from energetic to entropic stabilization in the nucleation and growth of a molecular rhombus tiling. Calculations based on a lattice-gas model show that clustering of topological defects and the formation of faceted boundaries followed by a slow relaxation to equilibrium occur under conditions of energetic stabilization. We also identify an entropically stabilized regime in which the system grows directly into an equilibrium configuration without the need for further relaxation. Our results provide a methodology for identifying equilibrium and nonequilibrium randomness in the growth of molecular tilings, and we demonstrate that equilibrium spatial statistics are compatible with exponentially slow dynamical behavior.

  5. Entropically stabilized growth of a two-dimensional random tiling.

    PubMed

    Stannard, Andrew; Blunt, Matthew O; Beton, Peter H; Garrahan, Juan P

    2010-10-01

    The assembly of molecular networks into structures such as random tilings and glasses has recently been demonstrated for a number of two-dimensional systems. These structures are dynamically arrested on experimental time scales, so the critical regime in their formation is that of initial growth. Here, we identify a transition from energetic to entropic stabilization in the nucleation and growth of a molecular rhombus tiling. Calculations based on a lattice-gas model show that clustering of topological defects and the formation of faceted boundaries followed by a slow relaxation to equilibrium occur under conditions of energetic stabilization. We also identify an entropically stabilized regime in which the system grows directly into an equilibrium configuration without the need for further relaxation. Our results provide a methodology for identifying equilibrium and nonequilibrium randomness in the growth of molecular tilings, and we demonstrate that equilibrium spatial statistics are compatible with exponentially slow dynamical behavior. PMID:21230240

  6. Flow and heat transfer in space vehicle tile gaps

    NASA Technical Reports Server (NTRS)

    Garimella, S. V.; Shollenberger, K. A.; Eibeck, P. A.; White, S.

    1992-01-01

    The flow patterns and the characteristics of the convective heat transfer in intersecting tile gaps on space vehicles were experimentally investigated using a water channel flow facility for simulating flow conditions in the tile gaps on the Aeroassist Flight Experiment (AFE) vehicle. It was found that penetration of external flow into the perpendicular gap was limited in most cases to roughly two gap widths, while greater entrainment occurred in the parallel gap. Heat transfer in the bulk of the perpendicular gap occurred by natural convection. The Reynolds number and the relative tile-height differences had the strongest influence on heat transfer and affected both the magnitude and the symmetry of the temperature and the flow fields.

  7. Task 4 supporting technology. Part 1: Detailed test plan for leading edge tile development. Leading edge material development and testing

    NASA Technical Reports Server (NTRS)

    Hogenson, P. A.; Staszak, Paul; Hinkle, Karrie

    1995-01-01

    This task develops two alternative candidate tile materials for leading edge applications: coated alumina enhanced thermal barrier (AETB) tile and silicone impregnated reusable ceramic ablator (SIRCA) tile. Upon reentry of the X-33/RLV space vehicle, the leading edges experience the highest heating rates and temperatures. The wing leading edge and nose cap experience peak temperatures in the range 2000 to 2700 F. Replacing reinforced carbon-carbon (RCC) with tile-based thermal protection system (TPS) materials is the primary objective. Weight, complexity, coating impact damage, and repairability are among the problems that this tile technology development addresses. The following subtasks will be performed in this development effort: tile coating development; SIRCA tile development; robustness testing of tiles; tile repair development; tile operations/processing; tile leading edge configuration; and life cycle testing.

  8. Performance and Calibration of CASTOR Calorimeter at CMS

    NASA Astrophysics Data System (ADS)

    Kuznetsova, Ekaterina

    CASTOR (Centauro And Strange Object Research) is a ?erenkov quartz-tungsten sampling calorimeter installed in the very forward region of the CMS experiment covering the pseudorapidity range -5.2 to -6.6. The location of CASTOR and current geometry of the shielding imply operation under relatively high radiation dose and magnetic ?eld. Except for very particular regions, the calorimeter read-out with ?ne mesh PMTs demonstrates good performance under these rough conditions. Relative calibration of CASTOR is done using beam halo muons. To obtain relevant data, a dedicated CASTOR trigger was developed and activated during beam injections and ramp-ups. The triggered events correspond to an isolated particle penetrating the calorimeter parallel to the beam axis. Analysis of the obtained spectra provides relative response to a muon per individual read-out channel. An absolute CASTOR calibration is not discussed here.

  9. Performance study of ASIC readout for electromagnetic calorimeter with injected charge

    E-print Network

    Elmaddin Guliyev

    2012-10-18

    High channel density and space restrictions required that the front end electronics integrated into the active elements of calorimeter. For that purpose novel readout chain base on Application-Specific Integrated Circuit (ASIC) designed for the Electromagnetic Calorimeter for the future International Linear Calorimeter experiment. In this paper, the performance study of ASIC with injected charge is presented.

  10. Isotensor hadronic parity violation

    NASA Astrophysics Data System (ADS)

    Tiburzi, B. C.

    2012-11-01

    Weak interactions between quarks give rise to hadronic parity violation which can be observed in nuclear and few-nucleon systems. We study the QCD renormalization of the isotensor component of parity violation at next-to-leading order accuracy. The renormalization group is employed to evolve the interaction down to hadronic scales. As the results are renormalization-scheme dependent, we compare various schemes, including ’t Hooft-Veltman dimensional regularization and several regularization-independent momentum subtraction schemes.

  11. Isotensor Hadronic Parity Violation

    E-print Network

    B. C. Tiburzi

    2012-10-16

    Weak interactions between quarks give rise to hadronic parity violation which can be observed in nuclear and few-nucleon systems. We study the QCD renormalization of the isotensor component of parity violation at next-to-leading order accuracy. The renormalization group is employed to evolve the interaction down to hadronic scales. As the results are renormalization scheme dependent, we compare various schemes, including 't Hooft-Veltman dimensional regularization, and several regularization independent-momentum subtraction schemes.

  12. Isotensor Hadronic Parity Violation

    E-print Network

    Tiburzi, B C

    2012-01-01

    Weak interactions between quarks give rise to hadronic parity violation which can be observed in nuclear and few-nucleon systems. We study the QCD renormalization of the isotensor component of parity violation at next-to-leading order accuracy. The renormalization group is employed to evolve the interaction down to hadronic scales. As the results are renormalization scheme dependent, we compare various schemes, including 't Hooft-Veltman dimensional regularization, and several regularization independent-momentum subtraction schemes.

  13. Radiobiology of Hadrons

    SciTech Connect

    Streit-Bianchi, Marilena [CERN, European Organization for Nuclear Research, Rte de Meyrin CH 1211, Geneve 23 (Switzerland)

    2008-08-11

    Radiobiological studies of hadrons beams are essential for optimizing tumour treatments. Whit hadrons when clinical facilities are running radiobiological studies are also done to ensure beam optimization and quality control as well as for the understanding of tumour and normal tissue reactions and late effects. Beam characteristic determinations nowadays are carried out according to well established radiobiological standard parameters and using well established biological reference systems. Some of the most recent studies on the topic are reported here.

  14. Hadronic production of glueballs

    SciTech Connect

    Lindenbaum, S.J.

    1983-01-01

    Local Gauge Invariance of SU(3)/sub c/ and color confinement would require that the only hadrons in the world be glueballs. However, when we add the quarks and obtain QCD it is experimentally clear that quark built states mask the expected glueballs. Thus discovery of glueballs is essential for the viability of QCD. Papers presented at the 1983 International Europhysics Conference on High Energy Physics on the hadronic production of glueballs and searches for glueballs are reviewed. (WHK)

  15. Very large hadron colliders

    SciTech Connect

    Harrison, M. [Brookhaven National Laboratory, RHIC Project, P.O. Box 5000, Upton, New York 11973-5000 (United States)

    1997-03-01

    Design and cost issues concerning the future (post Large Hadron Collider) Very Large Hadron Colliders (VLHC) are discussed. The basic accelerator concept is similar to current machines: long repetitive arcs in a 2-in-1 magnet scheme with a few interaction regions encompassing the experimental regions and accelerator facilities. A cost goal of 50 million dollars per TeV is discussed. (AIP) {copyright} {ital 1997 American Institute of Physics.}

  16. Tilescope: online analysis pipeline for high-density tiling microarray data Zhengdong D. Zhang1

    E-print Network

    Gerstein, Mark

    1 Tilescope: online analysis pipeline for high-density tiling microarray data Zhengdong D. Zhang1 pipeline Key words: high-density tiling microarray, high-density oligonucleotide microarray, microarray processing pipeline for analyzing tiling array data (http://tilescope.gersteinlab.org). In a completely

  17. CLUSTER INTERACTIONS FOR QUASIPERIODIC TILINGS Centre de Physique Theorique, Ecole Polytechnique,

    E-print Network

    Gähler, Franz

    CLUSTER INTERACTIONS FOR QUASIPERIODIC TILINGS FRANZ G Ë? AHLER Centre de Physique Thâ??eorique, Ecole Polytechnique, F­91128 Palaiseau, France A cluster for the octagonal square­rhombus tiling is presented, which has the prop­ erty that among all tilings completely covered by the cluster the perfectly quasiperi

  18. Proceedings of Symposia in Applied Mathematics Symbolic Dynamics and Tilings of Rd

    E-print Network

    Robinson Jr., E. Arthur (Robbie)

    of view of dynamical systems theory. This study takes place via a kind of dynamical system called a tiling [Pen74]. Penrose tilings play a central role in the theory of tiling dynamical systems because they lie of dy- namical systems theory, and in particular, symbolic dynamics. Our goal is to show that these two

  19. Extraction of tiled top-down irregular pyramids from large images

    E-print Network

    Extraction of tiled top-down irregular pyramids from large images Romain Goffe1 , Guillaume Damiand of tile for top-down topological pyramids to control accurately the amount of memory required by the construction of our model. As a result, this paper defines the topological model of tiled top-down pyramid

  20. Effect of tile effluent on nutrient concentration and retention efficiency in agricultural drainage ditches

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Tile drainage is a common water management practice in many agricultural landscapes in the Midwestern United States. Drainage ditches regularly receive water from agricultural fields through these tile drains. This field-scale study was conducted to determine the impact of tile discharge on ambient ...

  1. An isosceles triangle that tiles the sphere in exactly three ways

    E-print Network

    An isosceles triangle that tiles the sphere in exactly three ways Robert J. MacG. Dawson #3; Dept Abstract The (80 Æ ; 60 Æ ; 60 Æ ) spherical triangle tiles the sphere, though not in an edge-to-edge fashion. We show that it tiles in exactly three di#11;erent ways. Keywords: spherical triangle, monohedral

  2. Aerodynamic heating in gaps of thermal protection system tile arrays in laminar and turbulent boundary layers

    Microsoft Academic Search

    D. E. Avery

    1978-01-01

    An experimental heat-transfer investigation was conducted on two staggered arrays of metallic tiles in laminar and turbulent boundary layers. This investigation was conducted for two purposes. The impingement heating distribution where flow in a longitudinal gap intersects a transverse gap and impinges on a downstream blocking tile was defined. The influence of tile and gap geometries was analyzed to develop

  3. Steep-Slope Assembly Testing of Clay and Concrete Tile With and Without Cool Pigmented Colors

    SciTech Connect

    Miller, William A [ORNL

    2005-11-01

    Cool color pigments and sub-tile venting of clay and concrete tile roofs significantly impact the heat flow crossing the roof deck of a steep-slope roof. Field measures for the tile roofs revealed a 70% drop in the peak heat flow crossing the deck as compared to a direct-nailed asphalt shingle roof. The Tile Roofing Institute (TRI) and its affiliate members are keenly interested in documenting the magnitude of the drop for obtaining solar reflectance credits with state and federal "cool roof" building efficiency standards. Tile roofs are direct-nailed or are attached to a deck with batten or batten and counter-batten construction. S-Misson clay and concrete tile roofs, a medium-profile concrete tile roof, and a flat slate tile roof were installed on fully nstrumented attic test assemblies. Temperature measures of the roof, deck, attic, and ceiling, heat flows, solar reflectance, thermal emittance, and the ambient weather were recorded for each of the tile roofs and also on an adjacent attic cavity covered with a conventional pigmented and directnailed asphalt shingle roof. ORNL measured the tile's underside temperature and the bulk air temperature and heat flows just underneath the tile for batten and counter-batten tile systems and compared the results to the conventional asphalt shingle.

  4. Design and evaluation of shock-absorbing rubber tile for playground safety

    Microsoft Academic Search

    T. J. Huang; L. T. Chang

    2009-01-01

    Rubber tiles are commonly used in playgrounds as protective surfacing to reduce the incidence of head injuries in children caused by falling from equipment. This paper presents a newly designed rubber tile consisting of a surface layer of solid and a base layer of honeycomb shape plate-cell. This tile was applied to investigate head injury protective performance. A validated technique

  5. Random square-triangle tilings: A model for twelvefold-symmetric quasicrystals

    Microsoft Academic Search

    Mark Oxborrow; Christopher L. Henley

    1993-01-01

    Random tilings that comprise squares and equilateral triangles can model quasicrystals with twelvefold symmetry. A (phason) elastic theory for such tilings is constructed, whose order parameter is the phason field, and whose entropy density includes terms up to third order in the phason strain. Due to an unusual constraint, the phason field of any square-triangle tiling is irrotational and, as

  6. A simplified modelling approach for pesticide transport in a tile-drained field: The PESTDRAIN

    E-print Network

    Boyer, Edmond

    A simplified modelling approach for pesticide transport in a tile-drained field: The PESTDRAIN presents a simplified model called PESTDRAIN. It sim- ulates pesticide transport in a subsurface tile-drained field. It com- putes surface runoff and tile-drainage flow rates, along with the asso- ciated pesticide

  7. The tiling phenomenon of ?? modulators with time-varying inputs

    NASA Astrophysics Data System (ADS)

    Thao, Nguyen T.

    2007-09-01

    Currently, the most efficient technique to coarsely quantize the coefficients of redundant shift invariant signal expansions is a recursive method called ?? modulation. However, the error of approximation resulting from this type of quantization is difficult to analyze rigorously. This is because a ?? modulator is basically a nonlinear feedback system. With constant inputs, it was previously shown that the state vectors of ?? modulators of a certain class appear to remain in a tile. In this paper, we show experimentally that this property remains valid with a class of time-varying inputs. We explain the importance of the tiling property for the error analysis of ?? modulation.

  8. Power flux in the ITER divertor tile gaps during ELMs

    NASA Astrophysics Data System (ADS)

    Dejarnac, R.; Komm, M.; Gunn, J. P.; Panek, R.

    2009-06-01

    In order to withstand strong thermo-mechanical stress in the ITER's divertor, its plasma facing components will be castellated. Consequently, a larger area with complex geometry will be exposed to high fluxes coming from the plasma. In order to evaluate the possible damage caused by transient events, we present here calculations of the expected power loads in the ITER divertor tile gaps during ELMs. We use a self-consistent, two-dimensional particle-in-cell technique to model plasma deposition with realistic boundary conditions. The power loads on the tile surface and inside the gaps are investigated for various magnetic configurations of the strike point and strong plasma parameters.

  9. High-Performance Tiled WMS and KML Web Server

    NASA Technical Reports Server (NTRS)

    Plesea, Lucian

    2007-01-01

    This software is an Apache 2.0 module implementing a high-performance map server to support interactive map viewers and virtual planet client software. It can be used in applications that require access to very-high-resolution geolocated images, such as GIS, virtual planet applications, and flight simulators. It serves Web Map Service (WMS) requests that comply with a given request grid from an existing tile dataset. It also generates the KML super-overlay configuration files required to access the WMS image tiles.

  10. Fractal penrose tiles II: Tiles with fractal boundary as duals of penrose triangles

    Microsoft Academic Search

    Götz Gelbrich

    1997-01-01

    Summary  Suppose given a quasi-periodic tiling of some Euclidean space E\\u000a u\\u000a which is self-similar under the linear expansiong: E??E?. It is known that there is an embedding of E? into some higher-dimensional space ?\\u000a N\\u000a and a linear automorphism\\u000a $$\\\\bar g:\\\\mathbb{R}^N \\\\to \\\\mathbb{R}^N $$\\u000a with integer coefficients such that E\\u000a u\\u000a ? ?\\u000a N\\u000a is invariant under\\u000a $$\\\\bar g$$\\u000a andg

  11. The Scintillating Optical Fiber Calorimeter Instrument Performance (SOFCAL)

    NASA Technical Reports Server (NTRS)

    Christl, M. J.; Benson, C. M.; Berry, F. A.; Fountain, W. F.; Gregory, J. C.; Johnson, J. S.; Munroe, R. B.; Parnell, T. A.; Takahashi, Y.; Watts, J. W.

    1999-01-01

    SOFCAL is a balloon-borne instrument designed to measure the P-He cosmic ray spectra from about 200 GeV/amu - 20 TeV/amu. SOFCAL uses a thin lead and scintillating-fiber ionization calorimeter to measure the cascades produced by cosmic rays interacting in the hybrid detector system. Above the fiber calorimeter is an emulsion chamber that provides the interaction target, primary particle identification and in-flight energy calibration for the scintillating fiber data. The energy measurement technique and its calibration are described, and the present results from the analysis of a 1 day balloon flight will be presented.

  12. Imaging Calorimeter for ACCESS Simulations with GEANT/FLUKA

    NASA Technical Reports Server (NTRS)

    Watts, John; Lee, Jeongin

    2000-01-01

    Imaging Calorimeter for ACCESS (ICA) is a candidate of the calorimeter for the NASA's ACCESS program to be flown on the International Space Station. The ICA studies the origin and acceleration mechanism of cosmic rays by measuring the elemental composition of the cosmic rays in the energy up to 10(exp 16) eV. For the past year, Monte Carlo simulation study for the ICA has been conducted using GEANT/FLUKA to predict the detector performance and to design the system for match the scientific objectives. Simulation results will be shown for the detector response and the energy resolution for various configurations.

  13. The electromagnetic calorimeter of the AMS-02 experiment

    NASA Astrophysics Data System (ADS)

    Vecchi, M.; Basara, L.; Bigongiari, G.; Cervelli, F.; Chen, G.; Chen, G. M.; Chen, H. S.; Coignet, G.; Di Falco, S.; Elles, S.; Fiasson, A.; Fougeron, D.; Gallucci, G.; Goy, C.; Incagli, M.; Kossakowski, R.; Lepareur, V.; Li, Z. H.; Maire, M.; Paniccia, M.; Pilo, F.; Rosier-Lees, S.; Tang, X. W.; Vannini, C.; Vialle, J. P.; Zhuang, H. L.

    2012-12-01

    The electromagnetic calorimeter (ECAL) of the AMS-02 experiment is a 3-dimensional sampling calorimeter, made of lead and scintillating fibers. The detector allows for a high granularity, with 18 samplings in the longitudinal direction, and 72 sampling in the lateral direction. The ECAL primary goal is to measure the energy of cosmic rays up to few TeV, however, thanks to the fine grained structure, it can also provide the separation of positrons from protons, in the GeV to TeV region. A direct measurement of high energy photons with accurate energy and direction determination can also be provided.

  14. Primordial beryllium as a big bang calorimeter.

    PubMed

    Pospelov, Maxim; Pradler, Josef

    2011-03-25

    Many models of new physics including variants of supersymmetry predict metastable long-lived particles that can decay during or after primordial nucleosynthesis, releasing significant amounts of nonthermal energy. The hadronic energy injection in these decays leads to the formation of ?Be via the chain of nonequilibrium transformations: Energy(h)?T, ³He??He, ?Li??Be. We calculate the efficiency of this transformation and show that if the injection happens at cosmic times of a few hours the release of O(10 MeV) per baryon can be sufficient for obtaining a sizable ?Be abundance. The absence of a plateau structure in the ?Be/H abundance down to a O(10?¹?) level allows one to use beryllium as a robust constraint on new physics models with decaying or annihilating particles. PMID:21517297

  15. Foam on Tile Impact Modeling for the Space Shuttle Program

    NASA Technical Reports Server (NTRS)

    Stellingwerf, R. F.; Robinson, J. H.; Richardson, S.; Evans, S. W.; Stallworth, R.; Hovater, M.

    2003-01-01

    Following the breakup of the Space Shuttle Columbia during reentry a NASA-wide investigation team was formed to examine the probable damage inflicted on Orbiter Thermal Protection System (TPS) elements by impact of External Tank insulating foam projectiles. Our team was to apply rigorous, physics-based analysis techniques to help determine parameters of interest for an experimental test program, utilize validated codes to investigate the full range of impact scenarios, and use analysis derived models to predict aero-thermal-structural responses to entry conditions. We were to operate on a non-interference basis with the j Team, and were to supply significant findings to that team and to the Orbiter Vehicle Engineering Working Group, being responsive to any solicitations for support from these entities. The authors formed a working sub-group within the larger team to apply the Smooth Particle Hydrodynamics code SPHC to the damage estimation problem. Numerical models of the LI-900 TPS tiles and of the BX-250 foam were constructed and used as inputs into the code. Material properties needed to properly model the tiles and foam were obtained from other working sub-groups who performed tests on these items for this purpose. Two- and three- dimensional models of the tiles were constructed, including the glass outer layer, the densified lower layer of LI-900 insulation, the Nomex felt Strain Isolation Pad (SIP) mounting layer, and the underlying aluminum 2024 vehicle skin. A model for the BX-250 foam including porous compression, elastic rebound, and surface erosion was developed. Code results for the tile damage and foam behavior were extensively validated through comparison with the Southwest Research Institute (SwRI) foam-on-tile impact experiments carried out in 1999. These tests involved small projectiles striking individual tiles and small tile arrays. Following code and model validation we simulated impacts of larger ET foam projectiles on the TPS tile systems used on the wings of the orbiter. Tiles used on the Wing Acreage, the Main Landing Gear Door, and the Carrier Panels near the front edge of the wing were modeled. Foam impacts shot for the CAB investigation were modeled, as well as impacts at larger angles, including rapid rotation of the projectile, and with varying foam properties. General results suggest that foam impacts on tiles at about 500 mph could cause appreciable damage if the impact angle is greater than about 20 degrees. Some variations of the foam properties, such as increased brittleness or increased density could increase damage in some cases. Rapid (17 rps) rotation failed to increase the damage for the two cases considered. This does not rule out other cases in which the rotational energy might lead to an increase in tile damage, but suggests that in most cases rotation will not be an important factor. Similar models will be applied for other impacting materials, other velocities, and other geometries as part of the Return to Flight process.

  16. Charmed Hadrons from Strangeness-rich QGP

    E-print Network

    Inga Kuznetsova; Johann Rafelski

    2006-07-11

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

  17. Fractal spectral triples on Kellendonk's $C^*$-algebra of a substitution tiling

    E-print Network

    Michael Mampusti; Michael F. Whittaker

    2015-04-21

    We introduce a new class of noncommutative spectral triples on Kellendonk's $C^*$-algebra associated with a nonperiodic substitution tiling. These spectral triples are constructed from fractal trees on tilings, which define a geodesic distance between tiles in the tiling. We show that each spectral triple is $\\theta$-summable and respects the hierarchy of the substitution system. To elucidate our results we construct a fractal tree on the Penrose tiling and explicitly show how it gives rise to a collection of spectral triples.

  18. Substructure procedure for including tile flexibility in stress analysis of shuttle thermal protection system

    NASA Technical Reports Server (NTRS)

    Giles, G. L.

    1980-01-01

    A substructure procedure to include the flexibility of the tile in the stress analysis of the shuttle thermal protection system (TPS) is described. In this procedure, the TPS is divided into substructures of (1) the tile which is modeled by linear finite elements and (2) the SIP which is modeled as a nonlinear continuum. This procedure was applied for loading cases of uniform pressure, uniform moment, and an aerodynamic shock on various tile thicknesses. The ratios of through-the-thickness stresses in the SIP which were calculated using a flexible tile compared to using a rigid tile were found to be less than 1.05 for the cases considered.

  19. The development of a general purpose ARM-based processing unit for the ATLAS TileCal sROD

    NASA Astrophysics Data System (ADS)

    Cox, M. A.; Reed, R.; Mellado, B.

    2015-01-01

    After Phase-II upgrades in 2022, the data output from the LHC ATLAS Tile Calorimeter will increase significantly. ARM processors are common in mobile devices due to their low cost, low energy consumption and high performance. It is proposed that a cost-effective, high data throughput Processing Unit (PU) can be developed by using several consumer ARM processors in a cluster configuration to allow aggregated processing performance and data throughput while maintaining minimal software design difficulty for the end-user. This PU could be used for a variety of high-level functions on the high-throughput raw data such as spectral analysis and histograms to detect possible issues in the detector at a low level. High-throughput I/O interfaces are not typical in consumer ARM System on Chips but high data throughput capabilities are feasible via the novel use of PCI-Express as the I/O interface to the ARM processors. An overview of the PU is given and the results for performance and throughput testing of four different ARM Cortex System on Chips are presented.

  20. Three classes of one-dimensional, two-tile Penrose tilings and the Fibonacci Kronig-Penney model as a generic case

    NASA Astrophysics Data System (ADS)

    Holzer, Mark

    1988-07-01

    We generalize the Fibonacci Penrose tiling to three classes of one-dimensional, two-tile Penrose tilings which can be obtained geometrically as well as recursively. From a numerical study of their spectral properties, we conclude that the Fibonacci case has the generic features of all three classes. As a model of epitaxial quasiperiodic superlattices we consider a Fibonacci Kronig-Penney model and give a physical picture relating structural to spectral properties.

  1. Three classes of one-dimensional, two-tile Penrose tilings and the Fibonacci Kronig-Penney model as a generic case

    Microsoft Academic Search

    Mark Holzer

    1988-01-01

    We generalize the Fibonacci Penrose tiling to three classes of one-dimensional, two-tile Penrose tilings which can be obtained geometrically as well as recursively. From a numerical study of their spectral properties, we conclude that the Fibonacci case has the generic features of all three classes. As a model of epitaxial quasiperiodic superlattices we consider a Fibonacci Kronig-Penney model and give

  2. A novel implementation of tile-based address mapping Sambuddhi Hettiaratchi and Peter Y.K. Cheung

    E-print Network

    Cheung, Peter Y. K.

    sophisticated tile-based mapping. More- over, on average tile-based mapping implementation takes 10% less area] the problem of finding the best tile dimensions have been formulated as a mesh partitioning problem. In this paper we present an interesting simplification of the tile-based address mapping equations using

  3. Triangular Surface Tiling Groups for Low Genus S. Allen Broughton, Robert M. Dirks, Maria Sloughter, C. Ryan Vinroot

    E-print Network

    Broughton, S. Allen

    , with a kaleidoscopic tiling by non-obtuse trian- gles (tiles), i.e., each local reflection in a side of a triangle- etry, all geodesic, kaleidoscopic tilings by triangles, of hyperbolic surfaces of genus up to 13 a kaleidoscopic, geodesic tiling. A precise definition will be given later. Now, the reflections in the edges

  4. Hadronization of partons

    SciTech Connect

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

    2010-07-15

    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.

  5. Interactions between Lattice Hadrons

    E-print Network

    H. Rudolf Fiebig; Harald Markum

    2002-12-24

    The effective residual interaction for a system of hadrons has a long tradition in theoretical physics. It has been mostly addressed in terms of boson exchange models. The aim of this review is to describe approaches based on lattice field theory and numerical simulation. At the present time this subject matter is in an exploratory stage. A large array of problems waits to be tackled, so that known features of hadron-hadron interactions will eventually be understood in a model-independent way. The lattice formulation, being capable of dealing with the nonperturbative regime, describes strong-interaction physics from first principles, i.e. quantum chromodynamics (QCD). Although the physics of hadron-hadron interactions may be intrinsically complicated, the methods used in lattice simulations are simple: For the most part they are based on standard mass calculations. This chapter addresses commonly used techniques, within QCD and also simpler lattice models, describes important results, and also gives some insight into numerical methods for multi-quark systems.

  6. 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

  7. Phosphorus lateral movement through subsoil to subsurface tile drains

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Vertical subsurface P transport to tile drains is well documented, however little research has focused on lateral P transport. A replicated field study investigated the lateral movement of P through 3.0 m of typical Iowa subsoil (sandy loam texture, pH 7.7, 2 mg kg-1 Olsen P) between a 1.2-m deep tr...

  8. PHASE CHANGE MATERIALS IN FLOOR TILES FOR THERMAL ENERGY STORAGE

    Microsoft Academic Search

    Douglas C. Hittle

    2002-01-01

    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

  9. Function Approximation via Tile Coding: Automating Parameter Choice

    E-print Network

    Stone, Peter

    of the state­ action space. A variety of function approximation methods for RL have been proposed, includingFunction Approximation via Tile Coding: Automating Parameter Choice Alexander A. Sherstov and Peter of small, simulated domains. The success of RL on real­ world problems with large, often continuous state

  10. Ecoefficiency of fabric filters in the Italian ceramic tile industry

    Microsoft Academic Search

    Leo Breedveld; Giorgio Timellini; Giorgio Casoni; Alberto Fregni; Graziano Busani

    2007-01-01

    Italy is an important producer of ceramic tiles, with a high production share in Europe (50%) and worldwide (16%). Since early 1990s, fabric filters have been installed to reduce emissions of dust, lead, fluorine, etc. from firing kilns. Such end-of-pipe technologies can increase energy consumption and production costs. This paper presents a simplified LCA to assess the overall environmental effects

  11. Interior of shower stall on west side showing tile and ...

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

    Interior of shower stall on west side showing tile and three shower heads, view facing south-southeast - U.S. Naval Base, Pearl Harbor, Dry Dock No. 1, Latrine, Sixth Street, adjacent to Dry Dock No. 1, Pearl City, Honolulu County, HI

  12. Nutrient Transport in Tile-Fed Drainage Ditches

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Drainage ditches receive water and associated contaminants from agricultural fields via surface runoff or sub-surface tile drains. Little consideration has been given to the processes affecting nutrient transport once in surface water. The objective of this research was to evaluate the nutrient fa...

  13. Automated Tile Design for Self-Assembly Conformations German Terrazas

    E-print Network

    Krasnogor, Natalio

    Automated Tile Design for Self-Assembly Conformations Germ´an Terrazas ASAP Group School of CS and IT University of Nottingham gzt@cs.nott.ac.uk Natalio Krasnogor ASAP Group School of CS and IT University of Nottingham nxk@cs.nott.ac.uk Graham Kendall ASAP Group School of CS and IT University of Nottingham gxk

  14. Multiple Overlapping Tiles for Contextual Monte Carlo Tree Search

    E-print Network

    Paris-Sud XI, Université de

    Multiple Overlapping Tiles for Contextual Monte Carlo Tree Search Arpad Rimmel and Fabien Teytaud only a small relevant part of the whole problem, this allows it to ob- tain good performance to be automatically modified depending on the context: Contextual Monte Carlo (CMC) simulations. We show

  15. Multiple Overlapping Tiles for Contextual Monte Carlo Tree Search

    E-print Network

    on the context: Contextual Monte Carlo (CMC) simulations. We show that it improves the performance for the gameMultiple Overlapping Tiles for Contextual Monte Carlo Tree Search Arpad Rimmel1 and Fabien Teytaud1 relevant part of the whole problem, this allows it to ob- tain good performance in such situations

  16. On the Scalability of Loop Tiling Techniques David G. Wonnacott

    E-print Network

    Strout, Michelle Mills

    PLuTo automatic parallelizer have provided empiri- cal confirmation of the success of polyhedral provide weak scaling. In particular, the tiling currently performed by PLuTo does not scale in this sense the adoption of the polyhedral approach. However, the PLuTo automatic parallelizer [19, 6] has demonstrated

  17. Penrose tiling observed in a quasi-crystal

    Microsoft Academic Search

    L. A. Bursill; P. J. Lin

    1985-01-01

    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

  18. Spin waves and local magnetizations on the Penrose tiling

    Microsoft Academic Search

    Attila Szallas; Anuradha Jagannathan

    2008-01-01

    We consider a Heisenberg antiferromagnet on the Penrose tiling, a quasiperiodic system having an inhomogeneous Néel-ordered ground state. Spin wave energies and wave functions are studied in the linear spin wave approximation. A linear dispersion law is found at low energies, as in other bipartite antiferromagnets, with an effective spin wave velocity lower than that in the square lattice. Spatial

  19. Virasoro-type algebras associated with a Penrose tiling

    Microsoft Academic Search

    Volodymyr Mazorchuk; Reidun Twarock

    2003-01-01

    A family of infinite-dimensional Lie algebras with generators in a one-to-one correspondence with the points of a Penrose tiling is introduced. Central extensions, leading to Virasoro-type algebras, are constructed, and highest weight representations for these algebras are considered. Furthermore, extensions to a super-symmetric setting and thus aperiodic analogues to Virasoro super-algebras are discussed.

  20. In search of multipolar order on the Penrose tiling

    Microsoft Academic Search

    E. Y. Vedmedenko; S. Even-Dar Mandel; R. Lifshitz

    2008-01-01

    Based on Monte Carlo calculations, multipolar ordering on the Penrose tiling, relevant for two-dimensional molecular adsorbates on quasicrystalline surfaces and for nanomagnetic arrays, has been analyzed. These initial investigations are restricted to multipolar rotors of rank one through four - described by spherical harmonics Ylm with l=1...4 and restricted to m=0 - positioned on the vertices of the rhombic Penrose

  1. Construction of average unit cell for Penrose tiling

    Microsoft Academic Search

    Janusz Wolny; Bart?omiej Kozakowski; Przemys?aw Repetowicz

    2002-01-01

    Two appropriate reference lattices, oriented in different directions, have been used to construct the average unit cell for Penrose tiling. The obtained unit cell consists of four pentagons arranged in the physical plane. It has been shown that the pentagons are just the projections of the atomic surface from the 3D perpendicular space. For the two scattering vectors (corresponding to

  2. Penrose Tilings, Chaotic Dynamical Systems and Algebraic K-Theory

    Microsoft Academic Search

    Tamas Tasnadi

    2002-01-01

    After investigating by examples the unusual and striking elementary properties of the Penrose tilings and the Arnold cat map, we associate a finite symbolic dynamics with finite grammar rules to each of them. Instead of studying these Markovian systems with the help of set-topology, which would give only pathological results, a noncommutative approximately finite C*-algebra is associated to both systems.

  3. In search of multipolar order on the Penrose tiling

    Microsoft Academic Search

    E. Y. Vedmedenko; S. Even-Dar Mandel; R. Lifshitz

    2008-01-01

    We use Monte Carlo calculations to analyse multipolar ordering on the Penrose tiling, relevant for two-dimensional molecular adsorbates on quasicrystalline surfaces and for nanomagnetic arrays. Our initial investigations are restricted to multipolar rotors of rank one through four–described by spherical harmonics Ylm with l = 1, …, 4 and restricted to m = 0–positioned on the vertices of the rhombic

  4. A design rationale for NASA TileWorld

    NASA Technical Reports Server (NTRS)

    Philips, Andrew B.; Swanson, Keith J.; Drummond, Mark E.; Bresina, John L.

    1991-01-01

    Automated systems that can operate in unrestricted real-world domains are still well beyond current computational capabilities. This paper argues that isolating essential problem characteristics found in real-world domains allows for a careful study of how particular control systems operate. By isolating essential problem characteristics and studying their impact on autonomous system performance, we should be able to more quickly deliver systems for practical real-world problems. For our research on planning, scheduling, and control, we have selected three particular domain attributes to study: exogenous events, uncertain action outcome, and metric time. We are not suggesting that studies of these attributes in isolation are sufficient to guarantee the obvious goals of good methodology, brilliant architectures, or first-class results; however, we are suggesting that such isolation facilitates the achievement of these goals. To study these attributes, we have developed the NASA TileWorld. We describe the NASA TileWorld simulator in general terms, present an example NASA TileWorld problem, and discuss some of our motivations and concerns for NASA TileWorld.

  5. Investigation of borax waste behaviour in tile production

    Microsoft Academic Search

    S. Kurama; A. Kara; H. Kurama

    2007-01-01

    Although there are various studies published in the relevant literature on the use of borates in tile production, borax waste has been mainly used in place of feldspar and the results showed that borate migration to the surface was the commonly encountered problem. Previously, the same authors have investigated the possible use of dewatering sieve waste (TSW) of Etibor K?rka

  6. Micro-fabricated DC comparison calorimeter for RF power measurement.

    PubMed

    Neji, Bilel; Xu, Jing; Titus, Albert H; Meltzer, Joel

    2014-01-01

    Diode detection and bolometric detection have been widely used to measure radio frequency (RF) power. However, flow calorimeters, in particular micro-fabricated flow calorimeters, have been mostly unexplored as power meters. This paper presents the design, micro-fabrication and characterization of a flow calorimeter. This novel device is capable of measuring power from 100 \\(\\mu\\)W to 200 mW. It has a 50-Ohm load that is heated by the RF source, and the heat is transferred to fluid in a microchannel. The temperature change in the fluid is measured by a thermistor that is connected in one leg of a Wheatstone bridge. The output voltage change of the bridge corresponds to the RF power applied to the load. The microfabricated device measures 25.4 mm \\(\\times\\) 50.8 mm, excluding the power supplies, microcontroller and fluid pump. Experiments demonstrate that the micro-fabricated sensor has a sensitivity up to 22 \\(\\times\\) \\(10^{-3}\\) V/W. The typical resolution of this micro-calorimeter is on the order of 50 \\(\\mu\\)W, and the best resolution is around 10 \\(\\mu\\)W. The effective efficiency is 99.9\\% from 0-1 GHz and more than 97.5\\% at frequencies up to 4 GHz. The measured reflection coefficient of the 50-Ohm load and coplanar wave guide is less than \\(-25\\) dB from 0-2 GHz and less than \\(-16\\) dB at 2-4 GHz. PMID:25350509

  7. CONE CALORIMETER - A TOOL FOR MEASURING HEAT RELEASE RATE

    Microsoft Academic Search

    Johan Lindholm; Anders Brink; Mikko Hupa

    The cone calorimeter is considered the most significant bench scale instrument in fire testing. This apparatus has been adopted by the International Organization for Standardization (ISO 5660-1) for measuring heat release rate (HRR) of a sample. It has been shown that most fuels generate approximately 13.1 MJ of energy per kg of oxygen consumed. Therefore, HRR is based on the

  8. High-sensitivity microfluidic calorimeters for biological and chemical applications

    E-print Network

    Roukes, Michael L.

    at 1 nL and below. We attained excellent thermal resolution via on-chip vacuum encapsulation, which provides unprecedented thermal isolation of the minute microfluidic reaction chambers. We demonstrate/reaction chambers. Open-chamber chip calorimeters are built by using thermally isolated wells or platforms onto

  9. Solution Calorimeter with Peltier Cooling for Operation at Constant Temperature

    Microsoft Academic Search

    Fouad Kanbour; Micheal J. Joncich

    1967-01-01

    A new calorimeter has been designed for measurement of heats of solution and heats of chemical reaction. Endothermic and exothermic processes can be studied at temperatures constant at ±0.001 C° by balancing the heat removed through a Peltier device with Joule heat introduced by an electrical heater. The apparatus was tested by measuring the heats of solution of KCl and

  10. Resolution Performance of HERA-B Lead-Glass Calorimeters

    NASA Astrophysics Data System (ADS)

    Losada, Anthony; Brash, Edward; Thomas, Jordan; Ayerbe-Gayoso, Carlos; Burton, Matthew; Perdisat, Charles; Jones, Mark; Punjabi, Vina; Hast, Carsten; Szalata, Zenon

    2013-10-01

    In preparation of upcoming 12 GeV experiments at Thomas Jefferson National Accelerator Facility it is necessary to upgrade existing systems or install new detectors. As part of this effort, an array of lead-glass sampling calorimeters is need for use in the GEP-5 experiment. A sampling calorimeter can be used to determine the energy and spatial position of a high energy particle that enters it while simultaneously stopping the particle. To determine the appropriate construction to meet the needs of upcoming experiments, it was necessary to take an existing model and confirm its energy and position resolution. This model could then be confirmed as an option for the final construction, or used as a starting point to design a better detector. For our test we obtained ten lead-glass calorimeters used in HERA-B and tested them in End Station A at SLAC. I will report on our findings for the HERA-B lead-glass sampling calorimeters. I will cover the results of both the energy and position resolutions as well as the methods used to determine these quantities.

  11. U. Akgun, ECLIPSE06, Antalya, Quartz Plate Calorimeter Prototype

    E-print Network

    Akgun, Ugur

    U. Akgun, ECLIPSE06, Antalya, Turkey Quartz Plate Calorimeter Prototype "First Generation" U. Akgun. Onel The University of Iowa #12;U. Akgun, ECLIPSE06, Antalya, Turkey Introduction · While working for the first time this summer at CERN. #12;U. Akgun, ECLIPSE06, Antalya, Turkey Model Quartz Plate Prototype

  12. Development of a portable graphite calorimeter for radiation dosimetry.

    PubMed

    Sakama, Makoto; Kanai, Tatsuaki; Fukumura, Akifumi

    2008-01-01

    We developed and performance-tested a portable graphite calorimeter designed to measure the absolute dosimetry of various beams including heavy-ion beams, based on a flexible and convenient means of measurement. This measurement system is fully remote-controlled by the GPIB system. This system uses a digital PID (Proportional, Integral, Derivative) control method based on the LabVIEW software. It was possible to attain stable conditions in a shorter time by this system. The standard deviation of the measurements using the calorimeter was 0.79% at a dose rate of 0.8 Gy/min in 17 calorimeter runs for a (60)Co photon beam. The overall uncertainties for the absorbed dose to graphite and water of the (60)Co photon beam using the developed calorimeter were 0.89% and 1.35%, respectively. Estimations of the correction factors due to vacuum gaps, impurities in the core, the dose gradient and the radiation profile were included in the uncertainties. The absorbed doses to graphite and water irradiated by the (60)Co photon beam were compared with dosimetry measurements obtained using three ionization chambers. The absorbed doses to graphite and water estimated by the two dosimetry methods agreed within 0.1% and 0.3%, respectively. PMID:21976250

  13. D0 calorimeter upgrades for Tevatron Run II

    SciTech Connect

    Leslie S. Groer

    2001-08-15

    The electronic readout system for the D0 liquid argon calorimeter has been upgraded to take advantage of the upcoming Tevatron Run II. New scintillation preshower detectors have been installed as well as replacements for scintillation detectors in the intercryostat regions. These upgrades and preliminary testing and calibration results are described.

  14. Calorimeter analysis and test for symmetric circular waveguide mode output

    Microsoft Academic Search

    A. H. McCurdy; J. J. Choi; S. J. Cooke; G. S. Park; R. H. Kyser; B. G. Danly

    1997-01-01

    Summary form only given, as follows. To measure the radiated power from a high power millimeter wave device it is preferable to perform calorimetry. A calorimeter has been designed and tested for measurements on a 35 GHz gyroklystron amplifier experiment at NRL. The output radiation is in the form of a TE01 circular waveguide mode in a highly overmoded guide

  15. Towards a compensatable Muon Collider calorimeter with manageable backgrounds

    SciTech Connect

    Raja, R.; /Fermilab

    2012-04-01

    Muon Collider detectors pose very challenging problems in detector technology due to extremely large backgrounds present in the detector volume as a result of muon decays. Current designs of a 750 GeV/c per beam Muon Collider envisage 4.28 x 10{sup 5} muon decays per meter in the beam pipe close to the interaction region. The decay electrons after intense shielding still manage to produce large backgrounds in the detector volume of low energy photons, neutrons and higher energy Bethe Heitler muons. There are 170/184/6.8/177 TeVs energy entering the detector volume per crossing due to EM particles/Muons/Mesons/Baryons respectively. We investigate the capabilities of an iron calorimeter with pixelated readout where each pixel gives a yes/no answer as to whether a charged particle passed through it or not, to solve this problem. Each pixel is individually triggered by a 'travelling gate trigger' with a gate of 2 ns where the beginning of the gate is the time of arrival of a light signal from the interaction region to the pixel. We show that such a calorimeter is compensatable and propose two schemes to compensate the digital output in software to improve the resolution of the calorimeter. We show that such a calorimeter is capable of digitizing physics signals from the interaction region and as a result, the backgrounds from the muon decays are much reduced and under control.

  16. Hydrogen isotopes retention in the outboard first wall tiles of JT-60U

    NASA Astrophysics Data System (ADS)

    Yoshida, M.; Tanabe, T.; Nobuta, Y.; Hayashi, T.; Masaki, K.; Sato, M.

    2009-06-01

    We have investigated hydrogen isotopes retention in graphite tiles used as outboard first wall armors of JT-60U by means of SEM, TDS and SIMS. The SEM examination confirmed that these tiles are mostly eroded. Different from graphite divertor tiles, in which H retention was dominant owing to isotopic replacement during HH discharges preformed after DD discharges to remove tritium, deuterium is dominated in hydrogen isotopes retention of the outboard first wall tiles showing deeper penetration. This is attributed to the injection of high energy D and less isotopic replacement due to the lower temperature of the outboard first wall tiles. This type of hydrogen retention could not be avoided for the metallic wall. Although the amount of hydrogen isotopes retained per unit area in the outboard first wall tiles was much less than that for the divertor tiles, the integrated retention over the whole first wall surface could be very large.

  17. Tile Hamiltonian for decagonal AlCoCu derived from first principles

    NASA Astrophysics Data System (ADS)

    Al-Lehyani, Ibrahim; Widom, Mike

    2003-01-01

    A tile Hamiltonian (TH) replaces the actual atomic interactions in a quasicrystal with effective interactions, between and within tiles. We studied Al-Co-Cu decagonal quasicrystals described as decorated hexagon-boat-star (HBS) tiles using ab initio methods. The dominant term in the TH counts the number of H, B, and S tiles. The phason flips that replace an HS pair with a BB pair lower the energy. In Penrose tilings, quasiperiodicity is forced by arrow matching rules on the tile edges. The edge arrow orientation in our model of AlCoCu is due to Co/Cu chemical ordering. The tile edges meet in vertices with 72° or 144° angles. We find strong interactions between edge orientations at 72° vertices that force a type of matching rule. Interactions at 144° vertices are somewhat weaker.

  18. Aspects of Hadron Physics

    E-print Network

    C. D. Roberts; M. S. Bhagwat; S. V. Wright; A. Holl

    2008-02-01

    Detailed investigations of the structure of hadrons are essential for understanding how matter is constructed from the quarks and gluons of Quantum chromodynamics (QCD), and amongst the questions posed to modern hadron physics, three stand out. What is the rigorous, quantitative mechanism responsible for confinement? What is the connection between confinement and dynamical chiral symmetry breaking? And are these phenomena together sufficient to explain the origin of more than 98% of the mass of the observable universe? Such questions may only be answered using the full machinery of nonperturbative relativistic quantum field theory. This contribution provides a perspective on progress toward answering these key questions. In so doing it will provide an overview of the contemporary application of Dyson-Schwinger equations in Hadron Physics. The presentation assumes that the reader is familiar with the concepts and notation of relativistic quantum mechanics, with the functional integral formulation of quantum field theory and with regularisation and renormalisation in its perturbative formulation.

  19. QCD and Hadron Physics

    E-print Network

    Stanley J. Brodsky; Abhay L. Deshpande; Haiyan Gao; Robert D. McKeown; Curtis A. Meyer; Zein-Eddine Meziani; Richard G. Milner; Jianwei Qiu; David G. Richards; Craig D. Roberts

    2015-02-19

    This document presents the recommendations and scientific conclusions from the Town Meeting on QCD and Hadronic Physics that took place in the period 13-15 September 2014 at Temple University as part of the NSAC 2014 Long Range Planning process. It highlights progress in hadron physics in the seven years since the 2007 Long Range Plan (LRP07), and presents a vision for the future by identifying key questions and plausible paths to solutions which should define our next decade. In defining the priority of outstanding physics opportunities for the future, both prospects for the short (roughly 5 years) and longer term (beyond 10 years) are identified together with the facilities, personnel and other resources needed to maximize the discovery potential in hadronic physics worldwide. In this connection, the potential of an electron ion collider is highlighted.

  20. Development of a scintillating optical fiber ionization calorimeter

    NASA Technical Reports Server (NTRS)

    Takahashi, Y.

    1990-01-01

    A design study of a scintillation fiber (SF) calorimeter for a cosmic ray observation is made. An evaluation of various fibers and design configuration was made. The proposed design has a dimension of 1 m (W) x 1 m (L) x 16 cm (H) contains 1000 fibers at each of 40 x- or 40 y-layers interleaved with 1mm thick leadplates. Two or four CCD Particle Track Imaging Systems are connected to a bundle of SF edges at x- and y-ends. The overall weight of a calorimeter is 1,200 kg including read-out systems and supporting boards. The designed calorimeter can measure cosmic ray nuclei and gamma-rays with position, angles and energy information suitable for detailed spectrum analysis. The system is particularly beneficial at very high energies where the flux is extremely low and it requires a very long exposure over many years in space. Emulsion chambers have an advantage for cosmic ray measurements if the exposure is limited to several months in space. In fact, the most important energy region for the current cosmic ray studies is at around 1,000 TeV where a drastic change of elemental composition is indicated by various indirect observations. A detector whose size is in the order of 1 m(sup 2) requires several years of exposure in space accumulate sufficient statistics near 1,000 TeV. Emulsions will be strongly contaminated by background radiation for such a long duration flight, while SF calorimeter is totally immune from this concern. This is particularly important for long-duration experiments. The SF calorimeter also allows time-tagging of individual events, extending the experimental capability in various ways.