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- K. Shirasawa, T. Inagaki, H. Kitamura, T. Shintake
RIKEN Spring-8 Harima, Hyogo
- H. Baba, H. Matsumoto
KEK, Ibaraki
- S. Miura
MHI, Hiroshima
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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.
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