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  • 1
    Keywords: Beam optics-Computer simulation-Congresses. ; Electronic books.
    Description / Table of Contents: This volume provides an overview of the state of the art in computational accelerator physics, based on papers presented at the seventh international conference at Michigan State University, October 2002. It covers topics such as particle tracking and ray tracing, transfer map methods, methods for solving time-dependent Maxwell equations and static magnetic problems, as well as space charge and beam-beam effects. The book also discusses modern computational environments, including parallel clusters, visualization, and new programming paradigms. It is ideal for scientists and engineers working in beam or accelerator physics, and related areas of applied math and computer science.
    Type of Medium: Online Resource
    Pages: 1 online resource (365 pages)
    Edition: 1st ed.
    ISBN: 9781482269086
    DDC: 539.73
    Language: English
    Note: Cover -- Half Title -- Title Page -- Copyright Page -- Preface -- Contents -- Persistent currents in superconducting filaments due to arbitrary field changes in the transverse plane -- A simple parallelization of a FMM-based serial beam-beam interaction code -- Accuracy analysis of a 2D Poisson-Vlasov PIC solver and estimates of the collisional effects in space charge dynamics -- The COSY language independent architecture: porting COSY source files -- Simulation issues for RF photoinjectors -- Enhancements to iterative inexact Lanczos for solving computationally large finite element eigenmode problems -- New numerical methods for solving the time-dependent Maxwell equations -- Beam simulation tools for GEANT4 (and neutrino source applications) -- Muon cooling rings for the ν factory and the μ+ μ- collider -- Status of the Los Alamos Accelerator Code Group -- 3D space-charge model for GPT simulations of high-brightness electron bunches -- S-parameter-based computation in complex accelerator structures: Q-values and field orientation of dipole modes -- AHF booster tracking with SIMPSONS -- Parallel simulation algorithms for the three-dimensional strong-strong beam-beam interaction -- A parallel code for lifetime simulations in hadron storage rings in the presence of parasitic beam-beam interactions -- Using macroparticles with internal motion for beam dynamics simulations -- The software ModeRTL for simulation of radiation processes in electron beam technologies -- Computational aspects of the trajectory reconstruction in the MAGNEX large acceptance spectrometer -- Study of RF coupling to dielectric loaded accelerating structures -- On the map method for electron optics -- Aspects of parallel simulation of high intensity beams in hadron rings -- High-order beam features and fitting quadrupole-scan data to particle-code models. , Muon beam ring cooler simulations using COSY INFINITY -- Solenoid elements in COSY INFINITY -- Experience during the SLS commissioning -- Tracking particles in axisymmetric MICHELLE models -- Beam dynamics problems of the muon collaboration: ν-factories and μ+ -μ- colliders -- Simulation of electron cloud multipacting in solenoidal magnetic field -- RF heating in the PEP-II B-factory vertex bellows -- Optimization of RFQ structures -- A multigrid based 3D space-charge routine in the tracking code GPT -- On the applicability of the thin dielectric layer model for wakefield calculation -- COSY INFINITY's EXPO symplectic tracking for LHC -- ORBIT: Parallel implementation of beam dynamics calculations -- Vlasov simulation of beams -- Space charge studies and comparison with simulations using the FNAL Booster -- Progress in the study of mesh refinement for particle-in-cell plasma simulations and its application to heavy ion fusion -- Calculation of transversal wake potential for short bunches -- Author Index.
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  • 2
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: For the purpose of plasma-ion-energy analyses in a wide-energy range from a few hundred eV to hundreds of keV, upgraded semiconductor detectors are newly fabricated and characterized using a test-ion-beam line from 0.3 to 12 keV. In particular, the detectable lowest-ion energy is drastically improved at least down to 0.3 keV; this energy is one to two orders-of-magnitude better than those for commercially available Si-surface-barrier diodes employed for previous plasma-ion diagnostics. A signal-to-noise ratio of two to three orders-of-magnitude better than that for usual metal-collector detectors is demonstrated for the compact-sized semiconductor along with the availability of the use under conditions of a good vacuum and a strong-magnetic field. Such characteristics are achieved due to the improving methods of the optimization of the thicknesses of a Si dead layer and a SiO2 layer, as well as the nitrogen-doping technique near the depletion layer along with minimizing impurity concentrations in Si. Such an upgraded capability of an extremely low-energy-ion detection with the low-noise characteristics enlarges research regimes of plasma-ion behavior using semiconductor detectors not only in the divertor regions of tokamaks but in wider spectra of open-field plasma devices including tandem mirrors. An application of the semiconductor ion detector for plasma-ion diagnostics is demonstrated in a specially designed ion-spectrometer structure. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 1051-1053 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Negative H− ion beams produced by a tandem-type H− ion source have good beam optics with a typical beam divergence angle of less than 5 mrad. However, the physical reason has not yet been made clear. To clarify the mechanism, we investigate a velocity distribution of negative ions at the extraction holes by a three-dimensional (3D) Monte Carlo transport code. In this code, surface-produced H− ion trajectories are calculated by numerically solving the 3D equation of motion for H− ions. The energy of the H− ions is relaxed through Coulomb collision with the background plasma (H+ ions), which has a low temperature of ∼1 eV in the tandem-type H− ion source. Therefore, energy relaxation by Coulomb collision plays an important role in good beam optics. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4928-4936 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel end-loss ion-energy spectrometer is designed for plasma-ion diagnostics in open-ended plasma-confinement devices. This analyzer significantly upgrades a previous slanted grid end-loss analyzer (SELA) to essentially eliminate secondary-electron current, and to provide a differential-spectrum mode of operation, in addition to the usual integral-spectrum operation of gridded ion-energy analyzers. The upgraded SELA does not perturb the ambient magnetic field due to its electrostatic operation. Either the differential or integral spectra are obtained by a time sweep of grid voltages, collecting the ion current on a single-channel plate. Because the angular alignment of the SELA is not critical, it can be used as a spatially scannable diagnostic of ion-energy distributions and plasma potentials. It is characterized using computer simulations of ion trajectories, monoenergetic ion beams, and end-loss plasma from the world's largest tandem mirror—GAMMA 10. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 304-307 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A frequency shift of ω1F/2π=1.45 MHz is obtained for a 337-μm HCN laser beam by use of a rotating grating fabricated on the top of the rotor of a turbomolecular pump with a high rotating speed of 43200 rpm (super rotating grating). The frequency shift is one order higher than those with usual rotating gratings. Using this as a local beam, heterodyne detection of low-frequency microturbulence as well as high time resolution interferometry in plasmas becomes possible with a single far-infrared laser. The frequency-shifted beam is slightly frequency modulated (modulation index Mf(approximately-equal-to)1.2) with a period equal to the rotation period of the grating. This frequency modulation does no harm to these diagnostics.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect on sawtooth oscillations (STO) by localized electron-cyclotron-resonance heating (ECH) on the WT-3 tokamak [Plasma Physics and Controlled Nuclear Fusion Research, 1988 (International Atomic Energy Agency, Vienna, 1989), Vol. 1, p. 563] is studied. STO are strongly modified or stabilized by ECH near the q=1 surface, where q refers to the safety factor. The effect of ECH is much stronger when it is applied on the high-field side as compared to the low-field side. Further, even when ECH is applied outside the q=1 surface, the amplitude of STO decreases and STO stabilizes. In the very high qL discharge, the excitation of STO can be obtained by applying ECH.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Two multidimensional Monte Carlo simulation codes—(a) neutral (H2,H) transport code and (b) negative ion (H−) transport code—have been developed. This article focuses on the recent simulation results by the neutral transport code for the H− production in a large, hybrid negative ion source, "Camembert III." Two-dimensional spatial profiles of vibrationally excited molecules H2(v) and H− production are obtained for a given background plasma profile. Both H2(v) and H− ions are mainly produced near the filaments in the driver region. However, the H− source density has double peak in its spatial structure, while the density profile of H2(v) is characterized by the "mushroom" structure with a single peak. These results indicate a large potential of the neutral transport code, not only for the understanding of underlying physics, but also for designing ion sources, including complicating effects of geometry, spatial and velocity distribution of particles, and atomic and wall processes. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 9 (1962), S. 246-251 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 719-722 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    International Journal of Radiation Applications & Instrumentation. Part C, 37 (1991), S. 657-665 
    ISSN: 1359-0197
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
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