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Report No.

Status of 9-cell superconducting cavity development for ERL project in Japan

Umemori, Kensei*; Furuya, Takaaki*; Sakai, Hiroshi*; Takahashi, Takeshi*; Shinoe, Kenji*; Sawamura, Masaru

Superconducting cavities have been developed for realizing the high current future ERLs. Along with high accelerating gradient of 15-20 MV/m, strong HOM damping is important issue for the ERL main linac. We designed an HOM damped 9-cell cavity and fabricated a niobium 9-cell proto-type cavity. After a series of surface treatments, vertical tests were performed. At present, the accelerating gradient is limited to 15-17 MV/m due to field emissions. A rotating X-ray mapping system was developed and observed some X-ray traces. We report on these activities.



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