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TY - CONF AU - Huang, T.M. AU - Bing, B. AU - Chen, X. AU - Gu, K.X. AU - Lin, H.Y. AU - Ma, Q. AU - Meng, F. AU - Pan, W.M. AU - Wang, G.W. ED - Schaa, Volker RW ED - He, Yuan ED - Li, Lu ED - Zhao, Ning TI - The Improvement of the Power Coupler for CADS SC Spoke Cavities J2 - Proc. of SRF2017, Lanzhou, China, July 17-21, 2017 C1 - Lanzhou, China T2 - International Conference on RF Superconductivity T3 - 18 LA - english AB - Twenty superconducting spoke cavities mounted in three cryomodules (CM1, CM2 and CM4) were in-stalled in the CADS, a test facility of 10 mA, 25 MeV CW proton linac. Each cavity was equipped with one coaxial type fundamental power coupler (FPC). Fatal window crack was observed during the test cryomod-ule (TCM) commissioning. A series of experiments were subsequently implemented and eventually at-tributed the window crack to the electron bombard-ment from cavity field emission (FE). Improvements covering the coupler cleaning and assembly proce-dure, the structure and position modifications were thus implemented, aiming to reduce the cavity contam-ination and avoid the window damaged by cavity FE electrons. This paper will describe how the coupler window damaged by cavity field emission and the improve-ments for cure. In addition, the performances of FPCs for CM1, CM2 and CM4 were compared. PB - JACoW CP - Geneva, Switzerland SP - 220 EP - 222 KW - ion KW - cavity KW - electron KW - experiment KW - cryomodule DA - 2018/01 PY - 2018 SN - 978-3-95450-191-5 DO - 10.18429/JACoW-SRF2017-MOPB070 UR - http://jacow.org/srf2017/papers/mopb070.pdf ER -