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induction

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TUOBG03 Electron Beam Dynamics in the Long-pulse, High-current DARHT-II Linear Induction Accelerator electron, impedance, focusing, dipole 968
 
  • C. Ekdahl, E. O. Abeyta, P. Aragon, R. D. Archuleta, G. V. Cook, D. Dalmas, K. Esquibel, R. J. Gallegos, R. W. Garnett, J. F. Harrison, E. B. Jacquez, J. Johnson, B. T. McCuistian, N. Montoya, S. Nath, K. Nielsen, D. Oro, L. J. Rowton, M. Sanchez, R. D. Scarpetti, M. Schauer, G. J. Seitz, H. V. Smith, R. Temple
    LANL, Los Alamos, New Mexico
  • H. Bender, W. Broste, C. Carlson, D. Frayer, D. Johnson, C.-Y. Tom, C. P. Trainham, J. T. Williams
    NSTec, Los Alamos, New Mexico
  • T. C. Genoni, T. P. Hughes, C. H. Thoma
    Voss Scientific, Albuquerque, New Mexico
  • B. A. Prichard, M. E. Schulze
    SAIC, Los Alamos, New Mexico
  We are now operating the full-scale DARHT-II linear induction accelerator (LIA) at its rated energy, accelerating 2-kA electron beams to more than 17 MeV. The injector produces a beam pulse with a full-width at half maximum (FWHM) greater than 2.5 microseconds, and a ~0.5 microsecond rise time. This long risetime is deliberately scraped off in a special beam-head cleanup zone (BCUZ) before entering the 68-cell main accelerator. The accelerated electron beam pulse has a flat-top region where the final electron kinetic energy varies by less than 1% for more than 1.5 microseconds. We will discuss the tuning of the injector, BCUZ, and accelerator; and we will present data for the resulting beam transport and dynamics. We will also present beam stability data, which we will relate to previous stability experiments at lower current and energy*.

*Carl Ekdahl et al. "Long-pulse beam stability experiments on the DARHT-II linear induction accelerator," IEEE Trans. Plasma. Sci. Vol. 34, 2006, pp. 460-466.

 
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TUPD010 High-power Switch with SI-thyristor for the Power Supply of Very High Repletion Rate Pulsed Quadrupole Magnet quadrupole, power-supply, kicker, positron 1452
 
  • T. Mimashi, M. Kikuchi
    KEK, Ibaraki
  • A. Tokuchi, K. Tsuchida
    Nichicon (Kusatsu) Corporation, Shiga
  A solid-state switch with SI-thyristors is implemented as the high power switch for the pulsed quadrupole magnet power supply. Its repletion rate is 100 kHz with the half sign 1 microsecond pulse. The switch has been successfully operated.  
 
WEPC032 Absolute Measurement of the MLS Storage Ring Parameters electron, photon, storage-ring, radiation 2055
 
  • R. Klein, G. Brandt, R. Fliegauf, A. Hoehl, R. Müller, R. Thornagel, G. Ulm
    PTB, Berlin
  • M. Abo-Bakr, K. B. Buerkmann-Gehrlein, J. Feikes, M. V. Hartrott, K. Holldack, J. Rahn, G. Wuestefeld
    BESSY GmbH, Berlin
  The Metrology Light Source (MLS), the new electron storage ring of the Physikalisch-Technische Bundesanstalt (PTB) located next to BESSY II in Berlin - Adlershof is dedicated to metrology and technology development in the UV and EUV spectral range as well as in the IR and THz region. The MLS can be operated at various electron beam energies up to approx. 600 MeV and at electron beam currents varying from 1 pA (one stored electron) up to 200 mA and is optimized for the generation of coherent synchrotron radiation. Of special interest for PTB is the operation of the MLS as a primary radiation source standard from the visible up to the X-ray region. Therefore the MLS is equipped with all the instrumentation necessary to measure the storage ring parameters needed for the calculation of the spectral photon flux according to the Schwinger theory with low uncertainty. The instrumentation and measurement results for the determination of the storage ring parameters are presented.  
 
WEPC159 Compact Design of Race-track Microtron Magnets focusing, linac, microtron, electron 2380
 
  • J. P. Rigla, Yu. A. Kubyshin
    UPC, Barcelona
  • S. Ferrer
    ALBA, Bellaterra
  • A. V. Poseryaev, V. I. Shvedunov
    MSU, Moscow
  A novel design of the end magnets for race-track microtrons (RTMs) is proposed. It consists of four-poles with the REPM material being used as a source of the magnetic field. For a proper choice of parameters of such magnetic system it can provide both the closure of the first orbit after beam reflection and required focusing properties. It is shown that such end magnet can be made quite compact thus allowing to build miniature RTMs. The procedure of design of the four-pole magnetic system and its optimization using the ANSYS code is described in detail.  
 
WEPC161 Some Remarks about Characterization of Magnetic Blocks with Helmholtz Coil dipole, insertion, insertion-device, synchrotron 2386
 
  • G. Tosin, R. A. Pimenta
    LNLS, Campinas
  The use of Helmholtz coils for magnetic block characterization is a widespread technique because of its small sensitivity to block positioning errors and high precision. In this paper we present some calculations related to the influence of block positioning for the cases where the Helmholtz condition is not exactly satisfied. Also the comparison between a model based on point dipolar magnetic moment and magnetized blocks with real dimensions is analyzed, as well as the corrections associated to the effect of self-demagnetization of the blocks.  
 
WEPD001 The Quality Control of the LHC Continuous Cryostat Interconnections controls, vacuum, monitoring, collider 2398
 
  • F. F. Bertinelli, D. Bozzini, P. Cruikshank, P. Fessia, W. Maan, A. Poncet, S. Russenschuck, F. Savary, Z. Sulek, J.-P. G. Tock, D. Tommasini, L. R. Williams
    CERN, Geneva
  • P. B. Borowiec, A. Kotarba, S. Olek
    HNINP, Kraków
  • A. Grimaud
    ALL43, Saint-Genis-Pouilly
  • L. Vaudaux
    IEG, St-Genis-Pouilly
  The interconnections between the Large Hadron Collider (LHC) magnets have required some 40 000 TIG welded joints and 65 000 electrical splices. At the level of single joints and splices, non-destructive techniques find limited application: quality control is based on the qualification of the process and of operators, on the recording of production parameters, and on production samples. Visual inspection and process audits were the main techniques used. At the level of an extended chain of joints and splices - from a 53.5 m half-cell to a complete 2.7 km sector - quality control is based on vacuum leak tests, electrical tests and RF microwave reflectometry that progressively validated the work performed. Subsequent sector pressure tests, cryogenic circuits flushing with high pressure helium and cool-downs revealed a few unseen or new defects. The nature of defects is analyzed and classified according to their origin. Methods for defect localization are described. This paper presents an overview of the quality control techniques used and critically evaluates their effectiveness in progressively identifying defects, seeking lessons applicable to similar large, complex projects.  
 
WEPP129 Digital Acceleration Scheme of the KEK All-ion Accelerator acceleration, ion, synchrotron, controls 2797
 
  • T. S. Dixit
    GUAS/AS, Ibaraki
  • Y. Arakida, T. Iwashita, K. Takayama
    KEK, Ibaraki
  R&D works to realize an all-ion accelerator (AIA)*-capable of accelerating all ions of any possible charge state, based on the induction synchrotron concept, which was demonstrated using the KEK 12 GeV-PS in 2006 **, is going on. In the induction synchrotron, unlike an RF synchrotron, operational performance is not limited due to the frequency band-width, since the switching power supply to energize the induction acceleration system is triggered by signals obtained from the bunch monitor. For a POP experiment of AIA, argon ions will be accelerated in the KEK-500 MeV booster ring, a Rapid Cycle Synchrotron (f=20 Hz) and the RCS requires a dynamic change in the acceleration voltage. Since the induction acceleration voltage per pulse is fixed, a novel technique combining the pulse density control and intermittent operation of multi-acceleration cells has been proposed. The acceleration scheme of the AIA fully employing this technique was verified by computer simulation and demonstrated at our test facility, where a new induction acceleration cell generating an acceleration voltage pulse of 2 μsec long was triggered by a beam simulator to mimic a circulating Ar beam in the KEK-AIA

* K. Takayama, Y. Arakida, T. Iwashita, Y. Shimosaki, T. Dixit, K. Torikai, J. of Appl. Phys. 101, 063304 (2007).
**K. Takayama et al., Phys. Rev. Lett. 98, 054801 (2007).

 
 
THPC146 Beam Halo Monitor Using Diamond Detectors for XFEL/SPring-8 electron, undulator, radiation, permanent-magnet 3330
 
  • H. Aoyagi, Y. Asano, T. Bizen, K. Fukami, N. Nariyama
    JASRI/SPring-8, Hyogo-ken
  • T. Itoga, H. Kitamura, T. Tanaka
    RIKEN/SPring-8, Hyogo
  The construction of the XFEL facility at SPring-8 has been started. We have been developing a halo monitor as an interlock device for protection of undulator permanent magnets against radiation damage. When permanent magnets are irradiated with a halo part of 8GeV electron beam, magnetic fields are degraded permanently and laser oscillation is weakened. Therefore, the interlock device is required during machine operation. Diamond detector, which operates in photoconductive mode, is good candidate for electron beam sensor. The beam test of the diamond detector head has been carried out at the beam dump of the SPring-8 booster synchrotron. Minimum number of injected electron was about 1·105 /pulse, and we observed the pulse height of 0.1V having the pulse length of 0.6nsec FWHM without a preamplifier. The linearity of output signal on injected beam was also demonstrated. The beam halo monitor equipped with the diamond detectors is under manufacturing. The design and feasibility tests will be presented in this conference.  
 
THPP001 Development of FFAG Electron Accelerator septum, electron, extraction, acceleration 3372
 
  • T. Baba, M. Takahashi, Y. Yuasa
    NHVC, Kyoto
  • Y. Mori
    KURRI, Osaka
  Electron Beam (EB) Accelerators have been used in the many industrial fields to improve physical properties of the material. Examples are wire and cable industries, rubber tire industries, foam industries, etc. EB is also widely used for medical device sterilization as a popular tool. High power, high reliability, compactness and low cost are key requirements to get popularity of the technology and to open up its application fields. The paper will present FFAG electron accelerator to meet these requirements that NHV Corporation recently developed and some of the interesting performance such as beam extraction efficiency will be discussed in the paper.