Betatrons

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C.j. Elliott - One of the best experts on this subject based on the ideXlab platform.

  • Generalized electron beam matching in the free-electron laser
    IEEE Journal of Quantum Electronics, 1991
    Co-Authors: C.j. Elliott
    Abstract:

    Three matching schemes are presented for Gaussian profile electron beams in free-electron lasers (FELs). The three different classes of matching or symmetry conditions are (1) electron beams with separate betatron matching in each plane, (2) those with aspect ratio matching, and (3) cross-matched beams. The new schemes are distinct generalizations of well-known betatron matching and include ribbon profiles. The corresponding effective energy distributions and their Fourier transforms are obtained in analytical form. An analytical kernel produces the key Fredholm integral equation that solves the initial value problem.

F Zimmermann - One of the best experts on this subject based on the ideXlab platform.

  • Beam-beam effect with an external noise in LHC
    Proceedings of the IEEE Particle Accelerator Conference, 2007
    Co-Authors: K. Ohmi, W. Hofle, R. Calaga, Roberto Tomás, F Zimmermann
    Abstract:

    Proton beam do not have any damping mechanism for an incoherent betatron motion. A noise, which kicks beam particles in the transverse plane, gives a coherent betatron amplitude. If the system is linear, the coherent motion remains in an amplitude range. Nonlinear force, beam-beam and beam-electron cloud interactions, causes a decoher- ence for the betatron motion with keeping an amplitude of each beam particle, with the result that an emittance growth arises. We focus only a fast noise, the correlation time is 1-100 turns. Slower noise is less serious, because it is regarded as an adiabatic change like closed orbit change. As sources of the noise, we consider the bunch by bunch feedback system and phase jitter of cavities which turns to transverse noise via Crab cavity.

Vitaliy Ziskin - One of the best experts on this subject based on the ideXlab platform.

  • MEBCIS: Multi-energy betatron-based cargo inspection system
    2016 IEEE Nuclear Science Symposium Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop NSS MIC RTSD 2016, 2017
    Co-Authors: Anatoli Arodzero, Richard C. Lanza, Finn O'shea, Vincent Palermo, Sergey V. Kutsaev, Salime Boucher, Vitaliy Ziskin
    Abstract:

    The security market requirements for state-of-the-art mobile and portal radiography inspection systems include high imaging resolution (better than 5 mm line pair), penetration beyond 300 mm steel equivalent, material discrimination (three groups of Z) at speeds up to 16 km/h with 100% image sampling, low dose and small radiation exclusion zone. New research into radiography methods and systems has been actively pursued in order to achieve these challenging requirements. Recently, a significant portion of the R&D effort has been devoted to re-examining betatron based X-ray inspection systems. The advantages of the betatron-based inspection systems over conventional linac-based designs include small focal spot (which improves resolution), low weight and form-factor, a simpler control system and relatively low cost. A novel, low-dose Multi-Energy Betatron-based Cargo Inspection System, MEBCIS, presented in this paper relies on an innovative technique of extracting two X-ray pulses with lower-and higher-energies within a single betatron acceleration cycle (in contrast to conventional dual-energy Betatrons with one X-ray pulse produced during separate betatron acceleration cycles). In addition to the new betatron, new types of fast X-ray Scintillation-Cherenkov detectors, rapid processing of detector signals, an adaptive detector feedback algorithm for control of the betatron, and algorithms for intelligent material discrimination are parts of the overall MEBCIS system. The key advantage of the MEBCIS concept is that the material discrimination data is acquired in a single scan line rather than two. Thus, for the same betatron pulse rate, the scan rate can be twice as fast (better throughput) or can be done with a lower dose, even without adaptive dynamic pulse adjustment. Application of these techniques will maximize material discrimination, penetration, and contrast resolution while simultaneously reducing dose to the environment, resulting in a smaller exclusion zon- . Its minimal size and weight will allow MEBCIS to be placed on a lightweight truck chassis.

  • MEBCIS: Multi-energy betatron-based cargo inspection system
    2016 IEEE Nuclear Science Symposium Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS MIC RTSD), 2016
    Co-Authors: Anatoli Arodzero, Richard C. Lanza, Finn O'shea, Vincent Palermo, Sergey V. Kutsaev, Salime Boucher, Vitaliy Ziskin
    Abstract:

    The security market requirements for state-of-the-art mobile and portal radiography inspection systems include high imaging resolution (better than 5 mm line pair), penetration beyond 300 mm steel equivalent, material discrimination (three groups of Z) at speeds up to 16 km/h with 100% image sampling, low dose and small radiation exclusion zone. New research into radiography methods and systems has been actively pursued in order to achieve these challenging requirements. Recently, a significant portion of the R&D effort has been devoted to re-examining betatron based X-ray inspection systems. The advantages of the betatron-based inspection systems over conventional linac-based designs include small focal spot (which improves resolution), low weight and form-factor, a simpler control system and relatively low cost. A novel, low-dose Multi-Energy Betatron-based Cargo Inspection System, MEBCIS, presented in this paper relies on an innovative technique of extracting two X-ray pulses with lower-and higher-energies within a single betatron acceleration cycle (in contrast to conventional dual-energy Betatrons with one X-ray pulse produced during separate betatron acceleration cycles). In addition to the new betatron, new types of fast X-ray Scintillation-Cherenkov detectors, rapid processing of detector signals, an adaptive detector feedback algorithm for control of the betatron, and algorithms for intelligent material discrimination are parts of the overall MEBCIS system. The key advantage of the MEBCIS concept is that the material discrimination data is acquired in a single scan line rather than two. Thus, for the same betatron pulse rate, the scan rate can be twice as fast (better throughput) or can be done with a lower dose, even without adaptive dynamic pulse adjustment. Application of these techniques will maximize material discrimination, penetration, and contrast resolution while simultaneously reducing dose to the environment, resulting in a smaller exclusion zone. Its minimal size and weight will allow MEBCIS to be placed on a lightweight truck chassis.

K. Ohmi - One of the best experts on this subject based on the ideXlab platform.

  • Beam-beam effect with an external noise in LHC
    Proceedings of the IEEE Particle Accelerator Conference, 2007
    Co-Authors: K. Ohmi, W. Hofle, R. Calaga, Roberto Tomás, F Zimmermann
    Abstract:

    Proton beam do not have any damping mechanism for an incoherent betatron motion. A noise, which kicks beam particles in the transverse plane, gives a coherent betatron amplitude. If the system is linear, the coherent motion remains in an amplitude range. Nonlinear force, beam-beam and beam-electron cloud interactions, causes a decoher- ence for the betatron motion with keeping an amplitude of each beam particle, with the result that an emittance growth arises. We focus only a fast noise, the correlation time is 1-100 turns. Slower noise is less serious, because it is regarded as an adiabatic change like closed orbit change. As sources of the noise, we consider the bunch by bunch feedback system and phase jitter of cavities which turns to transverse noise via Crab cavity.

Finn O'shea - One of the best experts on this subject based on the ideXlab platform.

  • MEBCIS: Multi-energy betatron-based cargo inspection system
    2016 IEEE Nuclear Science Symposium Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop NSS MIC RTSD 2016, 2017
    Co-Authors: Anatoli Arodzero, Richard C. Lanza, Finn O'shea, Vincent Palermo, Sergey V. Kutsaev, Salime Boucher, Vitaliy Ziskin
    Abstract:

    The security market requirements for state-of-the-art mobile and portal radiography inspection systems include high imaging resolution (better than 5 mm line pair), penetration beyond 300 mm steel equivalent, material discrimination (three groups of Z) at speeds up to 16 km/h with 100% image sampling, low dose and small radiation exclusion zone. New research into radiography methods and systems has been actively pursued in order to achieve these challenging requirements. Recently, a significant portion of the R&D effort has been devoted to re-examining betatron based X-ray inspection systems. The advantages of the betatron-based inspection systems over conventional linac-based designs include small focal spot (which improves resolution), low weight and form-factor, a simpler control system and relatively low cost. A novel, low-dose Multi-Energy Betatron-based Cargo Inspection System, MEBCIS, presented in this paper relies on an innovative technique of extracting two X-ray pulses with lower-and higher-energies within a single betatron acceleration cycle (in contrast to conventional dual-energy Betatrons with one X-ray pulse produced during separate betatron acceleration cycles). In addition to the new betatron, new types of fast X-ray Scintillation-Cherenkov detectors, rapid processing of detector signals, an adaptive detector feedback algorithm for control of the betatron, and algorithms for intelligent material discrimination are parts of the overall MEBCIS system. The key advantage of the MEBCIS concept is that the material discrimination data is acquired in a single scan line rather than two. Thus, for the same betatron pulse rate, the scan rate can be twice as fast (better throughput) or can be done with a lower dose, even without adaptive dynamic pulse adjustment. Application of these techniques will maximize material discrimination, penetration, and contrast resolution while simultaneously reducing dose to the environment, resulting in a smaller exclusion zon- . Its minimal size and weight will allow MEBCIS to be placed on a lightweight truck chassis.

  • MEBCIS: Multi-energy betatron-based cargo inspection system
    2016 IEEE Nuclear Science Symposium Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS MIC RTSD), 2016
    Co-Authors: Anatoli Arodzero, Richard C. Lanza, Finn O'shea, Vincent Palermo, Sergey V. Kutsaev, Salime Boucher, Vitaliy Ziskin
    Abstract:

    The security market requirements for state-of-the-art mobile and portal radiography inspection systems include high imaging resolution (better than 5 mm line pair), penetration beyond 300 mm steel equivalent, material discrimination (three groups of Z) at speeds up to 16 km/h with 100% image sampling, low dose and small radiation exclusion zone. New research into radiography methods and systems has been actively pursued in order to achieve these challenging requirements. Recently, a significant portion of the R&D effort has been devoted to re-examining betatron based X-ray inspection systems. The advantages of the betatron-based inspection systems over conventional linac-based designs include small focal spot (which improves resolution), low weight and form-factor, a simpler control system and relatively low cost. A novel, low-dose Multi-Energy Betatron-based Cargo Inspection System, MEBCIS, presented in this paper relies on an innovative technique of extracting two X-ray pulses with lower-and higher-energies within a single betatron acceleration cycle (in contrast to conventional dual-energy Betatrons with one X-ray pulse produced during separate betatron acceleration cycles). In addition to the new betatron, new types of fast X-ray Scintillation-Cherenkov detectors, rapid processing of detector signals, an adaptive detector feedback algorithm for control of the betatron, and algorithms for intelligent material discrimination are parts of the overall MEBCIS system. The key advantage of the MEBCIS concept is that the material discrimination data is acquired in a single scan line rather than two. Thus, for the same betatron pulse rate, the scan rate can be twice as fast (better throughput) or can be done with a lower dose, even without adaptive dynamic pulse adjustment. Application of these techniques will maximize material discrimination, penetration, and contrast resolution while simultaneously reducing dose to the environment, resulting in a smaller exclusion zone. Its minimal size and weight will allow MEBCIS to be placed on a lightweight truck chassis.

  • High average current Betatrons for industrial and security applications
    2007 IEEE Particle Accelerator Conference (PAC), 2007
    Co-Authors: Solene Boucher, M. Ruelas, Finn O'shea, A. Murokh, J. Rosenzweig, Ronald Agustsson, Pedro Frigola, G. Travish
    Abstract:

    The fixed-field alternating-gradient (FFAG) betatron has emerged as a viable alternative to RF linacs as a source of high-energy radiation for industrial and security applications. For industrial applications, high average currents at modest relativistic electron beam energies, typically in the 5 to 10 MeV range, are desired for medical product sterilization, food irradiation and materials processing. For security applications, high power X-rays in the 3 to 20 MeV range are needed for rapid screening of cargo containers and vehicles. In a FFAG betatron, high-power output is possible due to high duty factor and fast acceleration cycle: electrons are injected and accelerated in a quasi-CW mode while being confined and focused in the fixed-field alternating- gradient lattice. The beam is accelerated via magnetic induction from a betatron core made with modern low- loss magnetic materials. Here we present the design and status of a prototype FFAG betatron, called the Radiatron, as well as future prospects for these machines.