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Nakayama, K.

 
Paper Title Page
TUOAFI03 Production of MeV Photons by the Laser Compton Scattering Using a Far Infrared Laser at SPring-8 961
 
  • H. Ohkuma, M. Shoji, S. Suzuki, K. Tamura, T. Yorita
    JASRI/SPring-8, Hyogo-ken
  • Y. Arimoto
    Osaka University, Osaka
  • M. Fujiwara, K. Kawase
    RCNP, Osaka
  • K. Nakayama, S. Okajima
    Chubu University, Kasugai, Aichi
 
  In order to produce MeV gamma-ray by the Laser Compton scattering (LCS), a high power optically pumped Far Infrared (FIR) laser has been developed at SPring-8. In the case of the SPring-8 storage ring, the momentum acceptance is so large (± 200 MeV) that the scattered electron is re-accelerated, then the stored beam is not lost by the LCS process. The beam diagnostics beamline is used to inject a FIR laser beam against 8-GeV stored electron beam and to extract MeV gamma-ray produced by LCS. The FIR laser system, gamma-ray production system, and measured gamma-ray spectrum will be presented. Future plans will also be introduced. In order to produce higher intense gamma-ray, we are constructing new gamma-ray production system at another beamline.  
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TUPCH132 Higher Order Mode (HOM) Damper of 500 MHz Damped Cavity for ASP Storage Ring 1325
 
  • J. Watanabe, K. Nakayama, K. Sato, H. Suzuki
    Toshiba, Yokohama
  • M. Izawa
    KEK, Ibaraki
  • A. Jackson, G. LeBlanc, K. Zingre
    ASP, Clayton, Victoria
  • T. Koseki
    RIKEN/RARF/CC, Saitama
  • N. Nakamura, H. Sakai, H. Takaki
    ISSP/SRL, Chiba
 
  TOSHIBA has delivered the storage ring RF system for the Australian Synchrotron Project(ASP). Two pairs of the 500MHz Higher Order Mode(HOM) damped cavities were applied for this system. Two on-centered and one off-centered dampers were attached for damping the longitudinal HOM impedance down to less than 20kOhm/GHz. In order to reduce the coupling of off-center damper for accelerating mode and improve cooling power of damper, New HOM damper was designed by optimizing SiC absorber structure and damper antenna length using HFSS code. The design and manufacture of the new HOM damper and the test are described.