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TY - UNPB AU - Kako, E. ED - Meseck, Atoosa ED - McAteer, Meghan ED - Schaa, Volker R.W. ED - V\xF6lker, Jens TI - Degradation and Recovery of Cavity Performance in Compact-ERL Injector Cryomodule at KEK J2 - Proc. of ERL2019, Berlin, Germany, 15-20 September 2019 CY - Berlin, Germany T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 63 LA - english AB - After cryomodule assembly and first cool-down tests in 2012, the cERL injector cryomodule has been stably operated with beam for eight years. However, gradual increases of x-ray radiation levels due to field emission were observed during the long term beam operation. High power pulsed RF conditioning as a cure method was firstly applied in the cool-down period in 2016, so that degraded cavity performances have almost recovered up to the previous levels. After that, high power pulsed RF conditioning has been repeatedly carried out as a standard procedure in the beginning of the cool-down periods in 2017-2019. Performance degradation and recovery status during the long term beam operation will be presented in this talk. PB - JACoW Publishing CP - Geneva, Switzerland ER -