The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform
R.a. Salimov - One of the best experts on this subject based on the ideXlab platform.
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High power DC Electron Accelerators of the ELV type
AIP Conference Proceedings, 2001Co-Authors: R.a. SalimovAbstract:The parameters of powerful Electron Accelerators capable of continuous operation are given. The main systems of the accelerator and a wide set of supplementary devices extending its application range are described. Some directions of further development are noted.
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d c high power Electron Accelerators of elv series status development applications
Radiation Physics and Chemistry, 2000Co-Authors: R.a. Salimov, N. K. Kuksanov, P. I. Nemytov, V G Cherepkov, J I Golubenko, G S Krainov, B M Korabelnikov, S A Kuznetsov, A B Malinin, S.e. PetrovAbstract:Abstract In the work presented here the parameters of powerful Electron Accelerators of continuous action are given and the main systems of the accelerator and a wide set of supplementary devices extending the application range of the accelerator are given and some directions of further development are noted.
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technological applications of binp industrial Electron Accelerators with focused beam extracted into atmosphere
Radiation Physics and Chemistry, 2000Co-Authors: S. N. Fadeev, M.g. Golkovski, A.i. Korchagin, N. K. Kuksanov, A.v. Lavruhin, S.e. Petrov, R.a. Salimov, A.f. VaismanAbstract:Abstract Simultaneously with production of industrial Accelerators BINP develops new EB technologies. For this purpose the set of equipment based on Electron Accelerators was installed. The accelerator has an energy range of 0.8–1.5 MeV and a maximum Electron beam power of 100 kW. Electron beam is extracted into the atmosphere through the system of diaphragms with output holes about 1 mm in diameter. The operational vacuum in the accelerating tube is provided by a differential pumping system. The extraction device is equipped with additional scanning magnets. It allows the operator to change average beam power density in extra wide region from 10 to 10 7 Wt/cm 2 . The focused beam has many applications due to its unique properties.
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The use of Electron Accelerators for radiation disinfestation of grain
Radiation Physics and Chemistry, 2000Co-Authors: R.a. Salimov, N. K. Kuksanov, V G Cherepkov, S.a. KuznetzovAbstract:Abstract One of the ways to fight the insect pest in grain is treatment by the beam of accelerated Electrons. This method provides an immediate cessation of the reproduction of their lifetime and intensity of nutrition, as well as the elimination of the latent forms of grain infestation (eggs, larvae, etc.). The main advantages of the Electron beam technology of grain disinfestation are the following: a possibility of grain disinfestation continuously at a rate corresponding to the high capacity of the process equipment of modern elevators with the full automation of the process and safety for personnel; it does not cause pollution of the environment and leaves no residual pollution in grain; the irradiated grain can be used immediately. At present, the powerful radiation disinfestation unit (Radiation Disinfestor, RD) on a base of ELV-4 40 kW power Electron accelerator with 3 m length extraction device has been developed for a technological line of capacity of 400 t/h. In 1980 two RDs on a base of ELV-2 Electron accelerator were put into operation at the Odessa port elevator of 200 t/h capacity each. RDs are installed between the elevator and the freight wharf of the port. The infested grain is delivered to the elevator for storage. The Electron Accelerators of the ELV-type used in this RD have an Electron beam power of 20 kW at an energy of up to 1.5 MeV. The operation mode is continuous with a guaranteed operation time of no less than 5000 h per year.
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High-energy Electron Accelerators for industrial applications
Physics-Uspekhi, 2000Co-Authors: R.a. SalimovAbstract:The principle of operation and the design of main parts of high-energy industrial Electron Accelerators are described. Accelerators based on high-voltage dc rectifiers are very efficient, compact and characterized by a high degree of unification of their main units. In total, more than 70 Accelerators have been manufactured at the G I Budker Institute of Nuclear Physics, with over 20 of them for export.
S M Shafroth - One of the best experts on this subject based on the ideXlab platform.
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x ray fluoresced high z up to z 82 k x rays produced by linbo3 and litao3 pyroelectric crystal Electron Accelerators
Applied Physics Letters, 2004Co-Authors: James D Brownridge, S M ShafrothAbstract:High-energy bremsstrahlung and K x rays were used to produce nearly background-free K x-ray spectra of up to 87keV (Pb) via x-ray fluorescence. The fluorescing radiation was produced by Electron Accelerators, consisting of heated and cooled cylindrical LiTaO3 and LiNbO3 crystals at mTorr pressures. The process of gas amplification whereby the ambient gas pressure is optimized to maximize the Electron energy was used to produce energetic Electrons which when incident on a W∕Bi target, gave rise to a radiation field consisting of high-energy bremsstrahlung as well as W and Bi K x rays. These photons were used to fluoresce Ta and Pb K x rays.
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x ray fluoresced high z up to z 82 k x rays produced by linbo3 and litao3 pyroelectric crystal Electron Accelerators
arXiv: Instrumentation and Detectors, 2003Co-Authors: James D Brownridge, S M ShafrothAbstract:High-energy bremsstrahlung and K X-rays were used to produce nearly background-free K X-ray spectra of up to 87 keV (Pb) via X-ray fluorescence. The fluorescing radiation was produced by Electron Accelerators, consisting of heated and cooled cylindrical LiTaO3 and LiNbO3 crystals at mTorr pressures. The newly discovered process of gas amplification whereby the ambient gas pressure is optimized to maximize the Electron energy was used to produce energetic Electrons which when incident on a W/Bi target gave rise to a radiation field consisting of high-energy bremsstrahlung as well as W and Bi K X-rays. These photons were used to fluoresce Ta and Pb K X-rays.
W P Leemans - One of the best experts on this subject based on the ideXlab platform.
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physics of laser driven plasma based Electron Accelerators
Reviews of Modern Physics, 2009Co-Authors: E Esarey, C B Schroeder, W P LeemansAbstract:Laser-driven plasma-based Accelerators, which are capable of supporting fields in excess of 100 GV/m, are reviewed. This includes the laser wakefield accelerator, the plasma beat wave accelerator, the self-modulated laser wakefield accelerator, plasma waves driven by multiple laser pulses, and highly nonlinear regimes. The properties of linear and nonlinear plasma waves are discussed, as well as Electron acceleration in plasma waves. Methods for injecting and trapping plasma Electrons in plasma waves are also discussed. Limits to the Electron energy gain are summarized, including laser pulse diffraction, Electron dephasing, laser pulse energy depletion, and beam loading limitations. The basic physics of laser pulse evolution in underdense plasmas is also reviewed. This includes the propagation, self-focusing, and guiding of laser pulses in uniform plasmas and with preformed density channels. Instabilities relevant to intense short-pulse laser-plasma interactions, such as Raman, self-modulation, and hose instabilities, are discussed. Experiments demonstrating key physics, such as the production of high-quality Electron bunches at energies of 0.1-1 GeV, are summarized.
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laser driven plasma wave Electron Accelerators
Physics Today, 2009Co-Authors: W P Leemans, E EsareyAbstract:Surfing a plasma wave, a bunch of Electrons or positrons can experience much higher accelerating gradients than a conventional RF linac could provide.
James D Brownridge - One of the best experts on this subject based on the ideXlab platform.
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x ray fluoresced high z up to z 82 k x rays produced by linbo3 and litao3 pyroelectric crystal Electron Accelerators
Applied Physics Letters, 2004Co-Authors: James D Brownridge, S M ShafrothAbstract:High-energy bremsstrahlung and K x rays were used to produce nearly background-free K x-ray spectra of up to 87keV (Pb) via x-ray fluorescence. The fluorescing radiation was produced by Electron Accelerators, consisting of heated and cooled cylindrical LiTaO3 and LiNbO3 crystals at mTorr pressures. The process of gas amplification whereby the ambient gas pressure is optimized to maximize the Electron energy was used to produce energetic Electrons which when incident on a W∕Bi target, gave rise to a radiation field consisting of high-energy bremsstrahlung as well as W and Bi K x rays. These photons were used to fluoresce Ta and Pb K x rays.
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x ray fluoresced high z up to z 82 k x rays produced by linbo3 and litao3 pyroelectric crystal Electron Accelerators
arXiv: Instrumentation and Detectors, 2003Co-Authors: James D Brownridge, S M ShafrothAbstract:High-energy bremsstrahlung and K X-rays were used to produce nearly background-free K X-ray spectra of up to 87 keV (Pb) via X-ray fluorescence. The fluorescing radiation was produced by Electron Accelerators, consisting of heated and cooled cylindrical LiTaO3 and LiNbO3 crystals at mTorr pressures. The newly discovered process of gas amplification whereby the ambient gas pressure is optimized to maximize the Electron energy was used to produce energetic Electrons which when incident on a W/Bi target gave rise to a radiation field consisting of high-energy bremsstrahlung as well as W and Bi K X-rays. These photons were used to fluoresce Ta and Pb K X-rays.
M C Downer - One of the best experts on this subject based on the ideXlab platform.
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diagnostics for plasma based Electron Accelerators
Reviews of Modern Physics, 2018Co-Authors: M C Downer, Rafal Zgadzaj, A Debus, U Schramm, M C KaluzaAbstract:Plasma-based Accelerators that impart energy gain as high as several GeV to Electrons or positrons within a few centimeters have engendered a new class of diagnostic techniques very different from those used in connection with conventional radio-frequency (rf) Accelerators. The need for new diagnostics stems from the micrometer scale and transient, dynamic structure of plasma Accelerators, which contrasts with the meter scale and static structure of conventional Accelerators. Because of this micrometer source size, plasma-accelerated Electron bunches can emerge with smaller normalized transverse emittance (en<0.1 mm mrad) and shorter duration (τb∼1 fs) than bunches from rf linacs. Single-shot diagnostics are reviewed that determine such small en and τb noninvasively and with high resolution from wide-bandwidth spectral measurement of electromagnetic radiation the Electrons emit: en from x rays emitted as Electrons interact with transverse internal fields of the plasma accelerator or with external optical fields or undulators; τb from THz to optical coherent transition radiation emitted upon traversing interfaces. The duration of ∼1 fs bunches can also be measured by sampling individual cycles of a copropagating optical pulse or by measuring the associated magnetic field using a transverse probe pulse. Because of their luminal velocity and micrometer size, the evolving structure of plasma Accelerators, the key determinant of accelerator performance, is exceptionally challenging to visualize in the laboratory. Here a new generation of laboratory diagnostics is reviewed that yield snapshots, or even movies, of laser- and particle-beam-generated plasma accelerator structures based on their phase modulation or deflection of femtosecond electromagnetic or Electron probe pulses. Spatiotemporal resolution limits of these imaging techniques are discussed, along with insight into plasma-based acceleration physics that has emerged from analyzing the images and comparing them to simulated plasma structures.
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laser Electron Accelerators for radiation medicine a feasibility study
Medical Physics, 2004Co-Authors: Charles B Chiu, M C Downer, Mykhailo Fomytskyi, Franklin Grigsby, Frank Raischel, T TajimaAbstract:Table-top laser wakefield Accelerators (LWFAs), proposed theoretically in 1979, have now generated individual Electron bunches in the laboratory with a significant number of Electrons having energies up to 10 MeV and beyond with the maximum energy reaching tens of MeV and charge per laser pulse of > 1 nC. The attained Electron beam properties have stimulated a discussion about the possible applications of LWFAs to medical radiation treatment, either directly or via conversion to x-rays. Our purpose in this paper is to analyze whether or not such applications are feasible, or can be made feasible with existing laser technology. Clinical Electron beam applications require the selection of specific Electron energies in the range of 6-25 MeV with a narrow energy bin (deltaE <5 MeV) for depth control, and a beam expansion to as much as 25 cm x 25 cm for various tumor radiation treatments. As a result, we show that present LWFA sources provide a dose rate that falls short of the requirements for clinical application by at least an order of magnitude. We then use particle simulations to evaluate the feasibility of developing an improved LWFA-based medical accelerator. Current LWFA sources require such high peak intensity that laser repetition rate is restricted to < or = 10 Hz. A scheme to lower the threshold and increase the repetition rate of efficient LWFA thus appears essential. We analyze one such scheme. We show that by "seeding" the primary laser pulse with a second, hundred-fold less intense pulse that is shifted downward in frequency by approximately the plasma frequency omegap, LWFA produces a yield of clinically useful Electrons per pulse comparable to that provided by an unseeded source, except that the primary pulse energy is now more than one order of magnitude lower than that in current LWFAs. This enables a repetition rate of approximately 100 Hz or more using existing laser technology, and thus dose rates (several Gy/min) in the range required for medical radiation applications.