Cavity Gradient Degradation in Cryomodule Tests in KEKSTF

Cavity Gradient Degradation in Cryomodule Tests in KEK-STF Kirk 1

History of STF Cryomodules superconducting rf test facility Phase-0. 5 (2007) MHI-04 Phase-1 (2008) MHI-03 MHI-04 MHI-02 MHI-01 S 1 -Global (2010) AES-004 ACC-11 Z-108 Z-109 MHI-05 MHI-06 MHI-07 MHI-09 Quantum Beam (2012) e– Already done! 10 cavities were tested in CM. MHI-12 MHI-13 Phase-2 (2014~) e– MHI-12 MHI-13 CM-1 MHI-14~22 (not included MHI-16) Q CM-2 a MHI-23~26 2

Comparison of Max. Gradient superconducting rf test facility 3

Status of RF Conditioning for MHI-12 600μsec 1500μsec 4

Status of RF Conditioning for MHI-12 600μsec 1500μsec 5

Last V. T. result in STF-2 superconducting rf test facility 6

Last V. T. result in STF-2 superconducting rf test facility 7

Achievement & Expectation superconducting rf test facility ④ ④ ② MHI-Kobe ⑧ ④ MHI-Mihara 8

superconducting rf test facility Fin. 9