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luminosity

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MOP023 Beam-Based Optics Correction for New Beam Transport Line from LINAC to Photon Factory in KEK linac, optics, beam-transport, quadrupole 85
 
  • N. Iida, M. Kikuchi
    KEK, Ibaraki
  The e+/e- injector LINAC in KEK usually injects into four rings which are Low Energy Ring(LER) of KEKB(3.5GeV/e+), High Energy Ring (HER) of KEKB(8.0GeV/e-), Photon Factory(PF)(2.5GeV/e-) and Advanced Ring for pulse X-rays(PF-AR)(3.0GeV/e-). While LINAC continuously injects into LER and HER alternatively every about five minutes, both of KEKB rings usually storage almost full operating currents. Time for PF or PF-AR which includes switching time had taken about 20 minutes a several times in a day. This had made luminosity at KEKB lower. In summer of 2005, a part of transport line from LINAC to PF were renewed, in which a DC bending magnet only for PF apportions electron beam from the end of LINAC to the new line. We succeeded to reduce the occupancy time for PF injection to about five minutes and there is almost no affection to KEKB luminosity. In this paper optics of the new PF beam transport line is described. In practical performance there had been leakage magnetic field from ECS magnets in KEKB(e+) beam transport line neighboring the PF line. Furthermore we measured the horizontal dispersions along the line. We describe about the magnetic shielding and the optics correction.  
 
MOP066 Wake Fields and Beam Dynamics Simulations for the 3.9-GHz Cavities of the ILC emittance, simulation, dipole, damping 196
 
  • R. M. Jones
    UMAN, Manchester
  • L. Bellantoni
    Fermilab, Batavia, Illinois
  • G. Burt, A. C. Dexter
    Cockcroft Institute, Lancaster University, Lancaster
  • A. Latina, D. Schulte
    CERN, Geneva
  Crab cavities are used for the ILC in order to increase the luminosity of the colliding beams. These cavities operate at the 3rd harmonic of the accelerating frequency (1.3GHz). We study the LOM (Lower Order Modes) and HOM (Higher Order Modes) excited by the beam. The corresponding wake field is calculated and simulations are conducted on the beam dynamics of the interaction of the wake field with the multi-bunch beam train.  
 
THP046 Status of 3.9-GHz Deflecting-Mode (CRAB) Cavity R&D dipole, simulation, beam-loading, positron 682
 
  • L. Bellantoni, H. Edwards, M. Foley, T. K. Khabiboulline, D. V. Mitchell, A. M. Rowe, N. Solyak
    Fermilab, Batavia, Illinois
  • C. Adolphsen
    SLAC, Menlo Park, California
  • G. Burt, A. C. Dexter
    Cockcroft Institute, Lancaster University, Lancaster
  • P. Goudket
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • T. W. Koeth
    Rutgers University, The State University of New Jersey, Piscataway, New Jersey
  The superconducting 3.9GHz deflecting mode cavity design which has been under development as a beam slice diagnostic is planned for use as the ILC crab cavity. We describe the applications and review the status of the R & D, giving both prototype test results and computational studies of beam interaction.