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TY - CONF AU - Sakai, H. AU - Furuya, T. AU - Kako, E. AU - Konomi, T. AU - Miura, T. AU - Qiu, F. AU - Umemori, K. ED - Schaa, Volker RW ED - Pei, Guoxi ED - Chin, Yong Ho ED - Fu, Shinian ED - Zhao, Ning TI - Long-term 0peration with Beam and Cavity Performance Degradation in Compact-ERL Main Linac at KEK J2 - Proc. of LINAC2018, Beijing, China, 16-21 September 2018 CY - Beijing, China T2 - Linear Accelerator Conference T3 - 29 LA - english AB - We developed ERL main linac cryomodule for Compact ERL (cERL) in KEK. The module consists of two 9-cell 1.3 GHz superconducting cavities. After construction of cERL recirculation loop, beam operation was started in 2013 Dec. First electron beam of 20 MeV successfully passed the main linac cavities. Beam current increased step by step and currently reached to 1mA (CW). Energy recovery has successfully achieved. However, field emission was one of the problems for long term operation. Therefore, the performance of the SRF cavities through long term beam operation has been investigated. In this paper, we express the measurement of the cavity performances and its degradation during long term beam operation. We also described the details of the cavity performance degradation and some trial for the cavity performance recovery. PB - JACoW Publishing CP - Geneva, Switzerland SP - 695 EP - 698 KW - cavity KW - operation KW - linac KW - vacuum KW - cryomodule DA - 2019/01 PY - 2019 SN - 2226-0366 SN - 978-3-95450-194-6 DO - DOI: 10.18429/JACoW-LINAC2018-THPO008 UR - http://jacow.org/linac2018/papers/thpo008.pdf ER -