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TY - CONF AU - Wu, A.D. AU - Chu, Q.W. AU - Guo, H. AU - He, Y. AU - Huang, S.C. AU - Jiang, T.C. AU - Li, C.L. AU - Lin, Z.Q. AU - Pan, F. AU - Song, Y.K. AU - Tan, T. AU - Yue, W.M. AU - Zhang, S.H. AU - Zhao, H.W. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - The Destructive Effects to the RF Coupler by the Plasma Discharge J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - The low temperature RF plasma was proved an effec-tive method to clean the niobium surface and relieve the field emission effect for the SRF cavities. In the case of half-wave resonators, these cavities were usually powered via the fundamental coupler with the electric coupling. Thus, coupler antennas were fixed in the intense electric field region, and this region was where the plasma rou-tinely ignited. Therefore, the ceramic window of coupler taken the risk of breakdown under the sputtering of ions and heating loads that may be caused by the plasma drift and diffusion from the electric field region. In this paper, the plasma ignition for surface cleaning on the HWR cavity and its coupler was investigated, and the power transmission, temperature raising and vacuum degradation were tested to characterize the adverse impacts on the ceramic window. Finally, the solution was proposed to figure these issues. PB - JACoW Publishing CP - Geneva, Switzerland SP - 285 EP - 287 KW - plasma KW - cavity KW - experiment KW - vacuum KW - coupling DA - 2019/08 PY - 2019 SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP085 UR - http://jacow.org/srf2019/papers/mop085.pdf ER -