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scattering

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MOP001 Pressurized Hydrogen-Filled Linacs for Muon Cooling emittance, linac, collider, radiation 28
 
  • R. P. Johnson, M. Alsharo'a, P. M. Hanlet, R. E. Hartline, M. Kuchnir
    Muons, Inc, Batavia
  • C. M. Ankenbrandt, V. Kashikhin, V. S. Kashikhin, A. Moretti, M. Popovic, K. Yonehara
    Fermilab, Batavia, Illinois
  • D. M. Kaplan
    Illinois Institute of Technology, Chicago, Illinois
  New techniques for muon ionization cooling require low-Z energy absorber, strong magnetic fields for focusing and emittance exchange, and high gradient RF cavities to replace the energy lost in the absorber. RF cavities pressurized with hydrogen gas are being developed to provide the most muon beam cooling possible in the short lifetime of the muon. We report the status of the cavity development, including the breakdown suppression due to the gas and new results showing that pressurized cavities show no degradation of performance in strong magnetic fields. We also comment on the development of the designs of the associated muon cooling linacs.  
 
TUP007 Low-Energy Linacs and Their Applications in Tsinghua University linac, electron, klystron, positron 256
 
  • C.-X. Tang, H. Chen, Y. H. Liu
    TUB, Beijing
  During these years, several kinds of low energy linacs were developed for cargo inspection, non-destructive-test and irradiation in Tsinghua University cooperated with NUCTECH company. The newly finished interlaced pulse dual energy 9/6MeV linac for material distinguishing cargo inspection and several others will be described here. The beam dynamics simulation and the experiment results together with some applications of these linacs will be given in this paper.  
 
TUP010 The Beam Halo Monitor of SARAF proton, target, background, vacuum 265
 
  • I. Mardor, D. Berkovits, Y. Eisen, G. Haquin, D. Hirschmann, E. Meroz
    Soreq NRC, Yavne
  • M. Hass, O. Heber, Y. Shachar
    Weizmann Institute of Science, Physics, Rehovot
  A main requirement for the SARAF accelerator is ‘hands-on’ maintenance, which implies a maximum beam loss of 1 nA per meter. In Phase I of SARAF (4-5 MeV ions at full current), we need to map the beam halo (BH) down to below 1 nA in order to predict, using beam dynamics calculations, the beam loss in the full accelerator. Mapping the halo of a 4 MeV, 2 mA ion beam down to below 1 nA is unprecedented, so we developed a BH monitor, which incorporates a direct charge measurement and several nuclear techniques, including Rutherford scattering 197Au(p,p)197Au, 7Li(p,n)7Be leading to both neutrons and the radio-isotope 7Be (measured offline post irradiation) and 19F(p,alpha)16O leading to high energy gamma rays. The current is derived using published cross sections. In this paper, we present the SARAF Phase I BH monitor and describe the various measurement techniques. In addition, results of feasibility studies at the Pelletron accelerator of the Weizmann Institute are given. The results of the various current measurement techniques are consistent with the standard Pelletron Faraday Cup to better than 20%. This is sufficient for mapping the SARAF beam halo to the desired accuracy.  
 
TUP014 Electron Signal Detection for the Beam-Finder Wire of the Linac Coherent Light Source Undulator electron, undulator, simulation, photon 274
 
  • J. Wu, P. Emma
    SLAC, Menlo Park, California
  The Linac Coherent Light Source (LCLS) is a SASE x-ray Free-Electron Laser (FEL) based on the final kilometer of the Stanford Linear Accelerator. The tight tolerances for positioning the electron beam close to the undulator axis calls for the introduction of Beam Finder Wire (BFW) device. A BFW device close to the upstream end of the undulator segment and a quadrupole close to the down stream end of the undulator segment will allow a beam-based undulator segment alignment. Based on the scattering of the electrons on the BFW, we can detect the electron signal in the main dump bends after the undulator to find the beam position. We propose to use a threshold Cherenkov counter for this purpose. According to the signal strength at such a Cherenkov counter, we then suggest choice of material and size for such a BFW device in the undulator.  
 
TUP036 Large Grain Superconducting RF Cavities at DESY superconductivity, superconducting-RF, free-electron-laser, RF-structure 327
 
  • W. Singer, A. Brinkmann, J. Iversen, G. Kreps, A. Matheisen, D. Reschke, X. Singer
    DESY, Hamburg
  The DESY R&D program on cavities fabricated from large grain niobium explores the potential of this material for the production of approx. 1000 nine-cell cavities for the European XFEL. The program investigates both, the basic material properties comparing large grain material to standard sheet niobium and the material availability, fabrication and preparation aspects. Several single-cell cavities of TESLA shape have been fabricated from large grain niobium. A gradient up to 41 MV/m at Q0 = 1.4·1010 (TB = 2K) was measured after electropolishing. Recently the first large grain nine-cell cavities worldwide have been produced under contract of DESY with ACCEL Instruments Co. The first cavity is already tested with an accelerating gradient of 29 MV/m after BCP (Buffered Chemical Polishing) treatment.  
 
TUP087 Ion Charge Stripping Foil Model for Beam Dynamics Simulation simulation, ion, linac, heavy-ion 463
 
  • D. Gorelov, F. Marti
    NSCL, East Lansing, Michigan
  An efficient computer model for the stripping foil simulation was proposed at NSCL/MSU as part of the Rare Isotope Accelerator (RIA) development. The model was successfully implemented in the LANA beam dynamics simulation code. Later this model was also included in the IMPACT code as well as in some other beam dynamics simulation tools. The derivation of the algorithm is presented and the application of the model for the uranium beam stripping simulation in context of the RIA driver linac studies at NSCL/MSU is analysed in the paper.  
 
TH2004 Nuclear Photo-Science and Applications with Thomson-Radiated Extreme X-Ray (T-REX) Sources laser, electron, photon, brightness 546
 
  • C. P.J. Barty, R. Beach, D. J. Gibson, C. Hagmann, F. V. Hartemann, E. P. Hartouni, J. Hernandez, M. Johnson, I. Jovanovic, J. Klay, D. P. McNabb, R. Norman, M. Shverdin, C. Siders, R. Soltz, P. O. Stoutland, A. M. Tremaine
    LLNL, Livermore, California
  • J. B. Rosenzweig
    UCLA, Los Angeles, California
  The Thomson scattering of picosecond and femtosecond duration laser pulses off of low emittance electron beams is an effective method of producing mono-chromatic, MeV-range gamma-rays with unprecedented peak brightness. With peak brightness at 1 MeV > 15 orders of magnitude beyond 3rd generation synchrotrons, these sources open the possibility for a host of new nuclear applications based on photons. In this presentation an overview of the requisite photo-gun, short pulse laser and linear accelerator technologies required for production of high brightness gamma-rays will be presented. Potential applications of these unique sources of radiation will be discussed with particular emphasis given to the excitation and use of nuclear resonance fluorescence (NRF) for isotope detection and imaging of special nuclear materials of importance to homeland security.