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Miura, S.

Paper Title Page
WEPMN022 High Gradient Tests of C-band Accelerating System for Japanese XFEL Project 2095
 
  • K. Shirasawa, T. Inagaki, H. Kitamura, T. Shintake
    RIKEN Spring-8 Harima, Hyogo
  • H. Baba, H. Matsumoto
    KEK, Ibaraki
  • S. Miura
    MHI, Hiroshima
 
  The C-band (5712 MHz) choke-mode type accelerating structure will be used for SCSS. Since the C-band accelerator generates higher accelerating gradient than traditional S-band accelerator, it makes the machine size compact and the cost low. In order to confirm the performance of the C-band accelerating system for the 8 GeV XFEL machine, the system including the same accelerating structure and RF system have been installed in the SCSS prototype accelerator. In the prototype machine, four 1.8 m long C-band accelerating structures are used to accelerate electron up to 250 MeV. From November 2005, we have operated the C-band accelerator in the prototype machine with no serious problem. After the RF conditioning, accelerating gradient up to 35 MV/m was achieved. Since a lot of C-band accelerator units, about 70 klystrons and 130 accelerating structures, will be used for 8 GeV XFEL machine, it is necessary to investigate the damage due to the beam operation. Therefore, we plan to observe the inside of the accelerating structure and pulse compressor in early 2007. In this paper, we will report on the achieved performance and the inside observation of the C-band accelerator.  
THPMN026 C-band Linac in SCSS Prototype Accelerator of the Japanese X-FEL Project 2766
 
  • T. Inagaki, T. Shintake, K. Shirasawa
    RIKEN Spring-8 Harima, Hyogo
  • H. Baba, H. Matsumoto
    KEK, Ibaraki
  • A. Miura
    Nihon Koshuha Co., Ltd., Yokohama
  • S. Miura
    MHI, Hiroshima
 
  Funding: RIKEN-JASRI Joint-Project for SPring-8 XFEL

C-band (5712-MHz) linac is used as the main accelerator of the Japanese X-FEL facility in SPring-8. Since the C-band linac has high acceleration gradient, our 8-GeV accelerator is compact rather than a conventional S-band accelerator. The system consists of following components; two choke-mode-type 1.8-m accelerating structures, an rf pulse compressor (SLED), a 50-MW klystron, a 100-MW compact modulator, and an rf digital control system. We will use 60 to 70 units for the X-FEL accelerator. Since November 2005, we have operated two C-band units in the 250-MeV FEL prototype accelerator (SCSS). After rf conditioning, the accelerating gradient was achieved to 35-MV/m. We successfully accelerated the electron beam by this gradient of electrical field. In this presentation, we will report the detail of each component and its operation status of the SCSS prototype accelerator.