... Title : Photon Accelerator: A Novel ... LASERS, LASER BEAMS, COHERENT OPTICAL ... WAVELENGTHS, ACCELERATION, PHOTONS, ELECTRON ...

... TRACE ELEMENTS, ALUMINUM FOIL, LUBRICATING OILS, LINEAR ACCELERATORS, CHARCOAL, PHOTON BEAMS, BISMUTH COMPOUNDS ...

... COMPUTERIZED SIMULATION, SYMPOSIA, OPTIMIZATION, QUADRUPOLE MOMENT, PHOTON BEAMS, PERMANENT MAGNET ...

A set of equipment designed to obtain quasimonochromatic linearly polarized high-energy photons in a linear accelerator is described. A beam of quasimonochromatic linearly polarized photons was obtained by coherent bremsstrahlung of electrons in diamond m...

A parasitic electron beam facility was developed at the Mark III linear accelerator, Stanford University. The beam was used both for physics experiments and for computer and spark chamber tests even though the beam intensity is very low. A tagged photon b...

The methods for obtaining electron and photon beams from high-energy proton accelerators are considered. The results of investigations of the electromagnetic interactions of elementary particles obtained by means of these beams are discussed.

The Exploratory Studies Group is dedicated to advanced investigation of accelerators and radiation, primarily in the area of charged-particle beams and photon beams. Its primary mission is to explore the next steps in the development of particle accelerat...

A tagged photon beam coherently emitted in Si monocrystal by electron beam with energy E/sub e/ = 31 GeV and intensity 4x10 exp 4 particle/pulse at pulse duration up to 1.7 s has been obtained at the Serpukhov proton accelerator. The intensity of photons ...

... QUANTUM THEORY OF INTENSE PHOTON BEAMS. ... of a photon beam of arbitrary ... QUANTUM THEORY, PHOTONS), (*PHOTONS, QUANTUM ...

We discuss beams of charged particles and radiation from multiple perspectives. These include fundamental acceleration and radiation mechanisms, underlying electron-photon interaction, various classical and quantum phase-space concepts and fluctuational interpretations.

Photoproduction of(eta) and(eta)(prime) mesons has been studied at the Continuous Electron Beam Accelerator Facility (CEBAF) Large Acceptance Spectrometer (CLAS) using a tagged photon beam incident on a hydrogen target with photon energies from the respec...

Since recent progress of electron guns extends the application of linear accelerators to photon radiation sources, the design and optimization of transverse beam optics over a linear accelerator become important. In this paper, we propose a transverse beam envelope analysis for ...

We discuss simulated photonic crystal structure designs for laser-driven particle acceleration. We focus on three-dimensional planar structures based on the so-called 'woodpile' lattice, demonstrating guiding of a speed-of-light accelerating mode by a defect in the photonic crystal lattice. We ...

The authors discuss simulated photonic crystal structure designs for laser-driven particle acceleration. They focus on three-dimensional planar structures based on the so-called ''woodpile'' lattice, demonstrating guiding of a speed-of-light accelerating mode by a defect in the ...

We discuss simulated photonic crystal structure designs for laser-driven particle acceleration. We focus on three-dimensional planar structures based on the so-called ``woodpile'' lattice, demonstrating guiding of a speed-of-light accelerating mode by a defect in the photonic crystal lattice. We introduce a ...

A method is provided to represent the calculated phase space of photons emanating from medical accelerators used in photon teletherapy. The method reproduces the energy distributions and trajectories of the photons originating in the bremsstrahlung target and of photons scattered by components ...

The Advanced Photon Source (APS) is a third-generation 7-GeV synchrotron radiation source. The precision measurement of beam current is a challenging task in high energy accelerators, such as the APS, with a wide range of beam parameters and complicated n...

Data on real-photon induced reactions have been taken using the Tagged Photon Facility (TPF) and the Continuous Electron Beam Accelerator Facility (CEBAF) at the Thomas Jefferson National Accelerator Facility (JLab) during the first year of running in Hall B. These data have been taken for the ...

A simple calorimetric dosimeter has been contrived to measure the radiation dose absorbed by di(2-ethylhexyl)phosphoric acid in irradiation with an electron or photon beam from a 60 MeV electron accelerator. The absorbed dose rate is related to the beam c...

Advanced Photon Source Technical Systems Accelerator Systems Storage Ring Status for the past 24 hours with real Time of Day User beam delineated. Current, Lifetime, History with...

The NSLS X-ray ring exhibits a direct correlation between photon beam motion, and distortion of the ring vacuum chamber induced by fluctuations in the cooling system. We have made long term measurements of photon beam vertical position, accelerator vacuum...

In the first chapter, terminology, physical and radiological quantities, and units of measurement used to describe the properties of accelerator radiation fields are reviewed. The general considerations of primary radiation fields pertinent to accelerators are discussed. The primary radiation fields produced by electron beams are ...

The modification of the distribution of the dose delivered in an electron beam by its addition to a photon beam is studied for three cases: electron beams of 10 to 30 MeV, x-ray beams produced by the same accelerator with gamma beams from /sup ...

Material properties are vital for the field of accelerator R&D. Euclid Techlabs in collaboration with the Argonne Wakefield Accelerator facility team has investigated accelerator applications of metamaterials, photonic band gap structures, nonlinear, paramagnetic and ferroelectric materials. In this paper we ...

An electron beam stop was designed to allow workers to be present in the experimental area while the accelerators are producing electron beam pulses. The beam stop is composed of a graphite region to stop the electron pulses and a surrounding tungsten region to attenuate photons produced by ...

A Monte Carlo model of an Elekta Precise linear accelerator has been built and verified by measured data for a 6 and 10 MV photon beam running with and without a flattening filter in the beam line. In this study the flattening filter was replaced with a 6 mm thick copper plate, provided by the linac vendor, in ...

A Monte Carlo model of an Elekta Precise linear accelerator has been built and verified by measured data for a 6 and 10 MV photon beam running with and without a flattening filter in the beam line. In this study the flattening filter was replaced with a 6 mm thick copper plate, provided by the linac vendor, in ...

The Advanced Photon Source (APS) is a third-generation synchrotron radiation source that stores positrons in a storage ring. The choice of positrons as accelerating particles was motivated by the usual reason: to eliminate the degradation of the beam caus...

A review is given of recent progress in this field, drawing heavily upon material presented at the Workshop on Advanced Accelerator Concepts, The Abbey, June 12--18, 1994. Attention is addressed to (1) plasma based concepts, (2) photo-cathodes, (3) radio frequency sources and Two-Beam Accelerators, (4) near and far-field schemes ...

Brookhaven National Laboratory Accelerator Test Facility is a laser-electron linear accelerator complex designed to provide high brightness beams for testing of advanced acceleration concepts and high power pulsed photon sources. Results of electron beam parameters attained ...

We discuss simulated photonic crystal structure designs for laser-driven particle acceleration, focusing on three-dimensional planar structures based on the so-called ''woodpile'' lattice. We demonstrate guiding of a speed-of-light accelerating mode by a defect in the photonic ...

Photoionization of multiply charged ions is studied using the merged-beams technique at the Advanced Light Source. An ion beam is created using a compact 10-GHz all-permanent-magnet ECR ion source and is accelerated with a small accelerator. The ion beam is merged with a ...

In this paper, we give a brief description of several advanced accelerating structures, such as dielectric loaded waveguides, photonic band gap, metamaterials and improved iris-loaded cavities. We describe wakefields generated by passing high current electron beams through these structures, and applications of wakefields to advanced ...

In this paper, we give a brief description of several advanced accelerating structures, such as dielectric loaded waveguides, photonic band gap, metamaterials and improved iris-loaded cavities. We describe wakefields generated by passing high current electron beams through these structures, and applications of wakefields to advanced ...

The dependence of angular spread of photon beams emitted from synchrotron internal targets, on a number of radial betatron oscillation of accelerated electrons and characteristics of targets being used is reported and the results of experimental investiga...

The MCNPX code has been employed on a personal computer to calculate the dosimetric characteristics of the photon beams from the 6 MV Siemens MX2 and the 10 MV Varian Clinac 2100C linear accelerators. A model of the treatment head includes the major geometric structure within the beam path. The model was used to ...

Accelerator-based atomic physics experiments at Brookhaven presently use heavy-ion beams from the Dual MP Tandem Van de Graaff Accelerator Facility for atomic physics experiments of several types. Work is presently in progress to develop experiments which will use the intense photon beams which ...

Relativistic electron irradiation of thin solid targets is known to generate collimated beams of x-ray photons in the forward direction by a number of different processes. A variety of mechanisms are discussed that share common characteristics in the angular and spectral distributions of the generated photon beams. ...

The Continuous Electron Beam Accelerator Facility (CEBAF) makes use of electron and photon beams with an energy up to 6 GeV to investigate the electromagnetic structure of mesons, nucleons, and nuclei. We discuss the physics motivation for updgrading the ...

The beam position monitors (BPMs) play a critically important role in commissioning and operation of accelerators. Accurate determination of the offsets relative to the magnetic axis and sensitivities of individual BPMs is thus needed. We will describe in...

Quantum effects could become important for particle and photon beams used in high-luminosity and high brightness applications in the current and next generation accelerators and radiation sources. This paper is a review of some of these effects.

Quantum effects could become important for particle and photon beams used in high-luminosity and high brightness applications in the current and next generation accelerators and radiation sources. This paper is a review of some of these effects.

This paper describes the development status of the beam position monitoring system for the Advanced Photon Source (APS), a third-generation light source now under construction at Argonne National Laboratory. The accelerator complex will consist of an elec...

Photonic crystals provide a method of confining a synchronous speed-of-light mode in an all-dielectric structure, likely a necessary feature in any optical accelerator. We explore computationally a class of photonic crystal structures with translational symmetry in a direction transverse to the electron beam. We ...

We have developed a tagged annihilation photon facility at the 720 MeV Saclay Linear Accelerator, delivering 130 to 530 MeV tagged photons. The typical flux produced in 25 MeV around 300 MeV is 104 photons per second with a 2 MeV energy resolution. The positron transport system is described; the tagging and tagged ...

Dosimetric measurements have been made of a 6 MV photon beam from a linear accelerator equipped with asymmetric jaws. The field size factors for asymmetrically set fields are compared to those for symmetrically set fields. The change of beam quality has been measured as a function of off-axis position of the ...

properties of squeezed photon beams gener- ... photon beams. In this short communication ... photon beams generated in three wave interaction ...

... of Directed Photon Beams with Surfaces. ... ELECTRONS, ELECTRON BEAMS, OXIDES ... RADIATION, HALIDES, PHOTONS, EJECTION, SPACE ...

Calculated results are presented of the photon dose rate from the induced activity in the vicinity of a beam scraper for a 400-GeV proton accelerator. Proton energies of 30 GeV and 400 GeV are considered since 30-GeV protons will be used for beam alignmen...

Beam loading of the radio-frequency (rf) accelerating cavities is an important consideration in the design and operation of high-current circular particle accelerators and storage rings. The steady-state and transient perturbations of the rf cavity system by the circulating beam can be harmful to the ...

Fast neutron contamination in photon beams in the 20 MV range have been reported in recent years. In order to determine if the variations were due mainly to differences in measurement procedures, or inherent in the design of the accelerators, three different 18-MV (BJR) photon beams were ...

The puzzle of the excitation spectrum of the nucleon, composed of broad and overlapping resonances, is still unresolved. For a complete experiment at least 8 well chosen single and double polarisation observables are needed. At the electron accelerator ELSA of the University of Bonn single- and double polarisation experiments are currently performed with the Crystal ...

For the diagnostics of Free Electron Laser (FEL) it is necessary to obtain accurate information on the position and profile of the electron and/or the photon beam. For these tasks, one promising method is the use of the so-called Ionization Profile Monitor (IPM). An essential advantage of this method is that the FEL beam is not ...

Parameters of the photon beams (6 and 20 MV) from a dual-energy linear accelerator (Mevatron-KD, Siemens Medical Laboratories, CA) are presented. The depth dose characteristics of the photon beams are d/sub max/ of 1.8 and 3.8 cm and percentage depth dose of 68% and 80% at 10-cm depth and ...

A combined system of beam position monitoring and rf measurement has been implemented at the APS S-band linear accelerator (linac). The linac is subdivided into five sectors and each sector is comprised of a klystron and associated accelerating structures. The instrumentation for each sector is located, together with its processor, in ...

The purpose of this study is to evaluate the dosimetric properties of a flattening filter free 6 MV photon beam. The 6 MV photon beam of a Varian Clinac 21 EX linac was modeled using the MCNP4C Monte Carlo (MC) code. Dosimetric features including central axis absorbed doses, beam profiles and ...

Radiotherapy electron beams are more complicated than photon beams due to variations in the beam production, the scattering of low-energy electrons, and the presence contaminant photons. The detailed knowledge of a radiotherapy beam is essential to an accurate calculation ...

This analysis shows that radiation measurements combined with a sophisticated simulation provides a simple but powerful tool for estimating beam temperature in intense pulsed annular electron-beam accelerators. Specifically, the mean angle of incidence of a 60 kA, 7 MeV annular electron-beam at the ...

This analysis shows that radiation measurements combined with a sophisticated simulation provides a simple but powerful tool for estimating beam temperature in intense pulsed annular electron-beam accelerators. Specifically, the mean angle of incidence of a 60 kA, 7 MeV annular electron-beam at the ...

Photoneutrons produced during radiation therapy with high energy photons is the main source of unwanted out-of-field received doses of patients. To analyze the neutron dose equivalent (NDE) for wedged beams and its variation with field size, Monte Carlo (MC) modeling of an 18MV photon beam was performed using MCNPX ...

We present the design and simulation of a three-dimensional photonic crystal waveguide for linear laser-driven acceleration in vacuum. The structure confines a synchronous speed-of-light accelerating mode in both transverse dimensions. We report the properties of this mode, including sustainable gradient and ...

The following articles are included in this publication: (1) The Advanced Photon Source: A Brief Overview; (2) MAD Analysis of FHIT at the Structural Biology Center; (3) Advances in High-Energy-Resolution X-ray Scattering at Beamline 3-ID; (4) X-ray Imaging and Microspectroscopy of the Mycorrhyizal Fungus-Plant Symbiosis; (5) Measurement and Control of ...

Combination of two linear accelerator projects, namely CLIC (Compact Linear Collider) and ILC (International Linear Collider) with LHC(Large Hadron Collider) offer an opportunity to build ?p collider. High energy photons are produced by the Compton backscattering of the laser photons off high energy electrons at the conversion region. ...

The Center for Beam Physics is a multidisciplinary research and development unit in the Accelerator and Fusion Research Division at the Lawrence Berkeley Laboratory of the University of California. At the heart of the Center`s mission is a fundamental quest for mechanisms of acceleration, radiation, transport, and focusing of energy ...

Neutron therapy beams are obtained by accelerating protons or deuterons on Beryllium. These neutron therapy beams present comparable dosimetric characteristics as those for photon beams obtained with linear accelerators; for instance, the penetration of a p(65)+Be neutron ...

A compact gamma-ray source using laser-accelerated electron beam is being under development at KAERI for nuclear applications, such as, radiography, nuclear activation, photonuclear reaction, and so on. One of two different schemes, Bremsstrahlung radiation and Compton backscattering, may be selected depending on the required specification of ...

We have developed a new beam injection system with a single pulsed sextupole magnet (PSM) at the photon factory storage ring (PF ring) in the High Energy Accelerator Research Organization. We demonstrated beam injection with this system and succeeded in storing a beam current of 450 mA, which ...

We present and analyze a conceptually new kind of charged particle accelerator, making use of a photonic band gap lattice for field confinement near the beam axis, and employing dielectric material to produce a synchronous longitudinal electric field. An example design is presented, we also discuss the absence of higher order dipole ...

In cooperation with the Saclay linear accelerator team, the photonuclear group has just completed the development of a new photon channel, the HE3B channel. In addition to what is already obtainable with the old HE3A channel (beams of bremsstrahlung or an...

Calculations have been carried out to evaluate several methods for reducing the residual photon dose rate inside an accelerator tunnel due to the activation of the concrete tunnel walls by thermal neutrons from a 3-GeV proton beam located on the axis of a...

... Dispersive properties of the photon beam, including the ... SPECTRA, MAGNETS, FAR FIELD, PHOTONS, BEAM FORMING, POLARIZATION ...

... of Two-Photon Double-Beam Optical Bistability,. ... Descriptors : *Multiple beams(Radiation), *Quantum electronics, *Two photon absorption, *Photon ...

The principal work at Saclay has been obtaining good energy definition in photon-induced reactions. The methods used are described; either a photon beam of variable energy and narrow spectrum is produced or a fine energy band is isolated from a continuous spectrum. The results obtained are reviewed. (auth)

The circular photon asymmetry for ?0? photoproduction on the proton was measured for the first time at the tagged photon facility of the MAMI C accelerator using the Crystal Ball/TAPS photon spectrometer. The experimental results are interpreted within a phenomenological isobar model that confirms the dominant role ...

Electron linear accelerators (linacs), as sources of photons and neutrons, can produce a significant number of fissions in transuranic isotopes contained in large barrels of waste material. Both photons and thermal neutrons have been used to detect about 1 mg of plutonium in 105-kg matrices. A sequential interrogation with neutrons and ...

Shielding estimates for the Advanced Photon Source (APS) have been computed utilizing presently available design parameters. Calculations of the resulting radiation fields have been made for several considerations involving normal beam loss, as well as for certain postulated accidental beam losses. Whenever available, experimental data ...

The Advanced Photon Source (APS) linear accelerator beam could be used to produce slow positrons during the hours between the storage ring injection cycles. Initial concepts for the design of a target that is optimized for slow-positron production are discussed, and simulation results are presented. Some possible ways to increase the ...

The Thomas Jefferson National Accelerator Facility (Jefferson Lab) has been funded by the US Navy to build an infra-red FEL driven by an energy-recovering compact SRF-based linear accelerator. The machine is to produce a 1 kW IR photon beam. The Jefferson Lab Accelerator Division is presently ...

We present the analysis of experiment-specific measurements of the efficiency of the Glasgow Photon Tagging Spectrometer in the A2 Hall at the Mainz Microtron (MAMI C). The photon tagger is being used for Crystal Ball and TAPS experiments. MAMI C is a particle accelerator capable of producing energies of up to 1.604 GeV. ...

Photon stimulated desorption of neutral species (PSD) is the major dynamic gas load in electron synchrotron light source. In the National Synchrotron Light Source, (NSLS) PSD presented initial machine commissioning difficulty. Sensitivity to surface contamination on PSD has been experienced during an incident of Fomblin Oil contamination.{sup 1} ...

Photon Stimulated Desorption of neutral species (PSD) is the major dynamic gas load in electron synchrotron light source. In the National Synchrotron Light Source, (NSLS) PSD presented initial machine commissioning difficulty. Sensitivity to surface contamination on PSD has been experienced during an incident of Fomblin Oil contamination. U1OB-Photon ...

photons will contribute to the diffuse photon background. Assuming ... photons to the photon back- ground. Based upon this, the following lifetime ...

Experiments with real photons have been performed for many years at the Mainz accelerator MAMI with different detectors. The upgraded MAMI C accelerator recently delivered electrons with an energy of 1604MeV. The A2 collaboration performs experiments with energy tagged polarised real photons produced via ...

Eleven papers dealing with photon beams from the accelerator, use of hydrogen bubble chambers and spark chambers, a storage ring for 10-Bev muons, muon beams and -p scattering experiments, mass analysis of highenergy accelerator beams, the search for ...

The 15-MV photon beam of a linear accelerator (Siemens Mevatron 20) was studied for electron and scattered photon contamination. The surface dose, attributable almost entirely to contamination electrons, has a Gaussian lateral distribution, a linear dependence on field width for square fields, and an inverse square ...

The 15-MV photon beam of a linear accelerator (Siemens Mevatron 20) was studied for electron and scattered photon contamination. The surface dose, attributable almost entirely to contamination electrons, has a Gaussian lateral distribution, a linear dependence on field width for square fields, and an inverse square ...

Proton beams can provide better dose conformity to the treatment target compared to commonly used photon and electron beams allowing for dose escalation and/or hypofractionation to increase local tumor control, reduce normal tissue complications and/or treatment time/cost. This paper reviews three novel proton ...

... Descriptors : *Linear accelerators, *Ion accelerators, *Particle accelerator components, *Electron accelerators, *Proton accelerators, Electron beams ...

The design criteria, construction details, and developmental tests of magnetostrictive spark chambers, particularly those used in the colliding beam experiments at the Cambridge Electron Accelerator, are described. Also, results of tests on efficiency, resolution, and shower detection of positrons and photons are presented. ...

In this note we discuss the possibility of studying the quantum electrodynamics of timelike photon propagators in muon or electron pair production by incident high energy muon or electron beams from presently available proton or electron accelerators.

Results from experiments performed with the electromagnetic calorimeter TAPS in combination with the tagged photon beam facility at the MAMI accelerator in Mainz are presented. In this contribution the photoproduction of pion pairs from the proton is discussed. In addition, preliminary results of the ? 0? decay of the ? resonance are ...

Beam stability and operational reliability of critical mechanical systems are key performance issues for synchrotron accelerators such as the Advanced Photon Source (APS). Stability is influenced by temperature fluctuations of the process water (PW) used ...

The main sources of instabilities in the Advanced Photon Source (APS) storage ring are expected to be higher-order modes (HOMs) of the accelerating cavities and the resistive wall impedance of the small insertion devices beam tubes. Extensive efforts are ...

The STAR electromagnetic calorimeter (EMC) will be used to measure the energy of photons and electrons from collisions of beams of particles in the RHIC accelerator under construction at Brookhaven National Laboratory. The present design is documented in ...

Monte Carlo simulation experiments have shown that very high energy electrons (VHEE), 150-250 MeV, have potential advantages in prostate cancer treatment over currently available electrons, photon and proton beam treatment. Small diameter VHEE beamlets can be scanned, thereby producing a finer resolution intensity modulated treatment than ...

Photon beam dosimetric methods are analyzed in relation to the measurement errors, utilization flexibility and preferential applications. The radiation type used in teleradiotherapy are either a gamma source (60 Co or 137 Cs) or X rays from accelerated electrons up to 45 MeV. The ion metering method, the chemical method, the ...

We derive formulae which describe the interaction of laser beams with electron beams. Specializing to the case of 1 TeV electron beams from the future generation of electron linear accelerators, we calculate the production rate of backscattered 1 TeV photons, and using these ...

... beam using the photon scattering force ... Descriptors : *ATOMIC BEAMS, *COLLIMATORS ... EXPERIMENTAL DESIGN, METHODOLOGY, PHOTONS. ...

... beam of molecules is crossed orthogonally with a pulsed beam of photons in a ... which is normal to the plane of the molecular and photon beams. ...

... from the photon emissions resulting ... (Author). Descriptors : *ELECTRON BEAMS, *BEAM POWER TUBES ... FIBER OPTICS, PHOTONS, KLYSTRONS ...

... using electron and intensity modulated photon was developed. ... of the two types of beams and showed ... the weight of the electron beam and the ...

... Adaptive Laser Beam Control Using Return Photon ... ILLUMINATION, *LASER BEAMS, *ESTIMATES, *PHOTON BEAMS, LABORATORY TESTS ...

The proposed experiment E-166 at SLAC is designed to demonstrate the possibility of producing longitudinally polarized positrons from circularly polarized photons to be used in future Linear Collider. The experimental set-up utilizes a low emittance 50 GeV electron beam passing through a helical undulator in the Final Focus Test Beam ...

The idea of producing beams of high energy photons by Compton backscattering of laser photons was proposed over 20 years ago. At the time, producing the required laser pulses was not feasible. However, recent advances in high average power, diode pumped lasers appear to have solved this problem. The US Collaboration is now turning its ...

Nonlinear photonic crystals are materials in which the second order susceptibility is modulated. These structures are often used in nonlinear optics applications for compensating the phase mismatch between interacting waves. The progress in techniques of modulating the nonlinearity enables to explore new applications, based on all-optical control of the phase, amplitude and ...

We describe the design and commissioning of the photon tagging beamline installed in experimental Hall B at the Thomas Jefferson National Accelerator Facility. This system can tag photon energies over a range from 20% to 95% of the incident electron energy, and is capable of operation with beam energies up to 6.1 ...

Electron beam outputs in the presence of beam shaping cutouts were measured for 6, 9, 12, 16, and 20 MeV electrons from a Varian-20 linear accelerator. This machine was provided with a new model of electron cones, for which photon jaw sizes were set differently from those of old cones. The effects of different ...

This work presents a method to empirically determine the photon spectrum of a megavoltage bremsstrahlung beam. The method makes use of the fact that scatter cross sections vary in a known fashion with incident photon energy. The distribution of scatter produced by a scattering object placed in a good geometry ...

A two-dimensional photonic crystal with a large full band gap has been designed, fabricated, and characterized. The photonic crystal design was based on a calculation using inverse iteration with multigrid acceleration. The fabrication of the photonic crystal on silicon was realized by the processes of ...

The proton beam duct of the accelerator-driven system (ADS) acts as a streaming path for spallation neutrons and photons and causes the activation of the magnets and other devices above the subcritical core. We have performed a streaming analysis at the upper section of the lead-bismuth target/cooled ADS (800 MWth). MCNPX was used to ...

The authors consider the steady-state transport of normally incident pencil beams of radiation in slabs of material. A method has been developed for determining the exact radial moments of 3-D beams of radiation as a function of depth into the slab, by solving systems of 1-D transport equations. They implement these radial moment equations in the ONEBFP ...

We consider the steady-state transport of normally incident pencil beams of radiation in slabs of material. A method has been developed for determining the exact radial moments of three-dimensional (3-D) beams of radiation as a function of depth into the slab, by solving systems of one-dimensional (1-D) transport equations. We implement these radial-moment ...

The beam-on time for intensity modulated radiation therapy (IMRT) is increased significantly compared with conventional radiotherapy treatments. Further, the presence of beam modulation devices may potentially affect neutron production. Therefore, neutron measurements were performed for 15 MV photon beams on a ...

Current utilization of the linear accelerator as well as 5-year cumulative experience in radiotherapy is presented. Cutaneous lymphomas and mammary gland carcinomas were the prime experience region; however, cancers at other locations were treated with mixed-beam therapy; employing fast neutrons and photon beams. ...

We discuss simulated photonic crystal structure designs for laser-driven particle acceleration, focusing on three-dimensional planar structures based on the so-called ''woodpile'' lattice. We describe guiding of a speed-of-light accelerating mode by a defect in the photonic ...

We discuss simulated photonic crystal structure designs for laser-driven particle acceleration, focusing on three-dimensional planar structures based on the so-called ''woodpile'' lattice. We describe guiding of a speed-of-light accelerating mode by a defect in the photonic ...

Idaho State University and the Idaho Accelerator Center are developing a polarized photon facility in the 10 MeV region using the off axis bremsstrahlung technique. Initial tests have been performed with the aim of using the high analyzing power of the photodisintegration of the deuteron to measure the beam polarization. A program is ...

The results of experiments devoted to studying the generation of MeV photons and protons in picosecond laser plasmas at a laser beam intensity of 1018 W/cm2 on Be, Ta, LiF and H7Li targets are presented. Nuclear reactions ( ?, n) and ( p, n) were used to detect MeV photons and protons. The number of MeV photons and ...

A slagging pyrolysis incinerator has been proposed to reduce the volume of stored transuranic (TRU) waste material. This report describes the electronics developed for a fast TRU waste assay system using photon interrogation. The system uses a pulsed electron beam from a linear accelerator to produce a high-energy ...

... High current electron beam transport in ... Descriptors : *BEAM FORMING, *ELECTRON ACCELERATORS, *ELECTRON BEAMS, HIGH ENERGY ...

Conventional low energy x-rays have been used in radiation therapy since the turn of the century. Van de Graaff and Betatron accelerators changed the complexion of radiation therapy in the mid 1940's by providing significantly deeper penetrating photon beams and also providing therapeutic quality electron ...

In this work, we investigate the relation between lateral fluence/dose distributions and photon beam uniformity, possibly identifying ways to improve these characteristics. The calculations included treatment head scatter properties associated with three common types of linear accelerators in order to study their impact on the results. ...

In this work, we investigate the relation between lateral fluence/dose distributions and photon beam uniformity, possibly identifying ways to improve these characteristics. The calculations included treatment head scatter properties associated with three common types of linear accelerators in order to study their impact on the results. ...

A realistic photon beam model based on Monte Carlo simulation of clinical linear accelerators was implemented in a convolution/superposition dose calculation algorithm. A primary and an extra-focal sources were used in this beam model to represent the direct photons from the target and the ...

The extracted rarefied (secondary) electron beam with the energy 1.65 GeV as well as the tagged photon beam produced on it are described. Characteristics of electron and photon beams are presented. The energy distribution of tagged photons is analyzed, an...

A conceptual study of a Continuous Wave (CW) positron production is presented in this paper. The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLAB) operates with a CW electron beam with a well-defined emittance, time structure and energy spread. Positrons created via bremsstrahlung ...

A conceptual study of a Continuous Wave (CW) positron production is presented in this paper. The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLAB) operates with a CW electron beam with a well-defined emittance, time structure and energy spread. Positrons created via bremsstrahlung ...

Measurements designed to find the collimator backscatter into the beam monitor chamber from Micro Multileaf collimator of 6 MV photon beams of the Siemens Primus linear accelerator were made with the help of dose rate feedback control. The photons and electrons backscattered from the upper and ...

Demonstrations of high-quality electron beams driven by compact and 10 Hz repetition rate lasers have been recently achieved by several research teams. We report in this paper numerical study results of an optimized conversion of these energetic electrons into high-energy photons, through the bremsstrahlung process in a dense material. Dedicated ...

The flexibility in radiotherapy can be improved if a patient can be moved between any one of the department's medical linear accelerators without the need to change anything in the patient's treatment plan. For this to be possible, the dosimetric characteristics of the various accelerators must be the same, or nearly the same i.e. the ...

A device and method for generating extremely short-wave ultraviolet electromagnetic wave uses two intersecting plasma beams generated by two plasma accelerators. The intersection of the two plasma beams emits electromagnetic radiation and in particular radiation in the extreme ultraviolet wavelength. In the preferred orientation two ...

The Advanced Light Source (ALS) is a new synchrotron radiation source which has been proposed by Lawrence Berkeley Laboratory. The ALS will be a key component in a major new research facility, the National Center for Advanced Materials. The ALS will consist of an electron linear accelerator, a booster synchrotron, a 1.3-GeV electron storage ring, and a number of ...

... Title : Electron and Photon-Beam Induced Thin-Film Growth,. ... Directed energetic beams (electrons, photons, ions), however, can induce ...

Adaptive Laser Beam Control Using Return Photon Statistics ... for extended targets and non-Gaussian beams. ... of statistics of return photons," Appl. ...

... Title : Adaptive Laser Beam Control Using Return Photon Statistics. ... SYSTEMS, *LASER BEAMS, *PHOTONS, DATA PROCESSING ...

Modern electron circular accelerators and accumulators are sources of intensive beams of synchrotron radiation (SR). The wide range of wavelengths emitted by electrons per cycle operation of the accelerator, the high degree of polarization (98%), high instantaneous intensities of photon flux in a narrow range of ...

Laser plasma accelerators provide electron beams with parameters of interest in many fields and in particular for radiotherapy. A short review of progress achieved recently will be presented. We have performed dose deposition simulations using a quasi-monoenergetic electron beam in the 200 MeV range as produced today with laser-plasma ...

... Accelerators and Colliders; Beam Dynamics; Applications and New Methods of Acceleration; New Methods; Linear Accelerators and Pulsed Power ...

The Darmstadt High-Intensity Photon Setup (DHIPS) for photon-scattering and photodissociation experiments at the superconducting electron linear accelerator S�DALINAC has been improved. We report on its present performance. The developments include the installation of a segmented radiator for an online evaluation of the ...

The Exploratory Studies Group is dedicated to advanced investigation of accelerators and radiation, primarily in the area of charged-particle beams and photon beams. Its primary mission is to explore the next steps in the development of particle accelerators and storage rings, which are ...

The Exploratory Studies Group is dedicated to advanced investigation of accelerators and radiation, primarily in the area of charged-particle beams and photon beams. Its primary mission is to explore the next steps in the development of particle accelerators and storage rings, which are ...

Monte Carlo calculations have been made to determine the energies delivered by photons and neutrons to the human body irradiated by collimated photon beams. The beams were monoenergetic and ranged from 100 keV to 40 MeV. The energy deposition in the body was sorted into two regions: inside and outside the ...

Monte Carlo calculations have been made to determine the energies delivered by photons and neutrons to the human body irradiated by collimated photon beams. The beams were monoenergetic and ranged from 100 keV to 40 MeV. The energy deposition in the body was sorted into two regions: inside and outside the ...

... General aspects of the photon-photon scattering process are ... is calculated for high and low energy photons. ... clash two laser generated x-ray beams. ...

Nonlinear optical effects in certain types of crystals have the capacity to improve the performance of sampling circuits by a large margin. The theory on nonlinear optics and the associated devices is rather straightforward. I will present some of the relevant ideas and illustrate how these principles can result in order of magnitude improvements in sampling circuits. As an example of the ...

The helicity dependence of the total cross-section for the ? n ? p ?-_ ?0_ reaction has been measured for the first time at incident photon energies from 450 to 800MeV. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. Both ...

In conventional clinical linear accelerators, the flattening filter scatters and absorbs a large fraction of primary photons. Increasing the beam-on time, which also increases the out-of-field exposure to patients, compensates for the reduction in photon fluence. In recent years, intensity modulated radiation ...

In conventional clinical linear accelerators, the flattening filter scatters and absorbs a large fraction of primary photons. Increasing the beam-on time, which also increases the out-of-field exposure to patients, compensates for the reduction in photon fluence. In recent years, intensity modulated radiation ...

... Descriptors : *ELECTRON ACCELERATORS, *LINEAR ACCELERATORS, USSR, ALIGNMENT, ELECTRON BEAMS, PRECISION ...

We review the current and future accelerator technologies for generation of high brightness radiation beam.

As the frontier of particle physics moves towards higher energies, there is a mounting pressure on the accelerator physics community to develop new accelerating concepts resulting in more compact accelerators. This requires higher accelerating gradients and, owing to the trapping criterion, higher radiation ...

Medical accelerators with photon energies over 10 MeV generate an undesired fast neutron contamination in the therapeutic beam. In this work, the Monte Carlo code MCNP was used to simulate the transport of these photoneutrons across the head of various medical accelerators of high energy. The average and most ...

Photon Simulated Desorption of neutral species (PSD) is the major dynamic gas load in electron synchrotron light source. In the National Synchrotron Light Source, PSD presented initial machine commissioning difficulty. Sensitivity to surface contamination on PSD had been experienced during an incident of Fomblin Oil contamination. U10B-Photon Stimulated ...

The Thomas Jefferson National Accelerator Facility (Jefferson Lab) houses a 4 GeV, 200 {micro}A continuous wave (CW) recirculating electron accelerator. This underground accelerator is made up of two superconducting linear accelerators (linacs), two arcs, a beam switch yard (BSY), and three end ...

This article investigates the performance of Al{sub 2}O{sub 3}:C optically stimulated luminescence dosimeters (OSLDs) for application in radiotherapy. Central-axis depth dose curves and optically stimulated luminescence (OSL) responses were obtained in a water phantom for 6 and 18 MV photons, and for 6, 9, 12, 16, and 20 MeV electron beams from a Varian ...