Cryomodule tests of four Tesla-like cavities in the Superconducting RF Test Facility at KEK

• Main Authors: Eiji Kako, Hitoshi Hayano, Shuichi Noguchi, Norihito Ohuchi, Masato Satoh, Toshio Shishido, Ken Watanabe, Yasuchika Yamamoto
• Format: Article
• Language: English
• Published: American Physical Society 2010-04-01
• Series: Physical Review Special Topics. Accelerators and Beams
• Online Access: http://doi.org/10.1103/PhysRevSTAB.13.041002

A 6-m cryomodule including four Tesla-like cavities was developed, and was tested in the Superconducting RF Test Facility phase-I at KEK. The performance as a total superconducting cavity system was checked in the cryomodule tests at 2 K with high rf power. One of the four cavities achieved a stable pulsed operation at 32  MV/m, which is higher than the operating accelerating gradient in the ILC. The maximum accelerating gradient (E_{acc,max⁡}) obtained in the vertical cw tests was maintained or slightly improved in the cryomodule tests operating in a pulse mode. Compensation of the Lorentz force detuning at 31  MV/m was successfully demonstrated by a piezo tuner and predetuning.