Degradation and recovery of cavity performances in compact-erl injector cryomodule

After cryomodule assembly and first cool-down tests in 2012, the cERL injector cryomodule has been stably operated with beam for five years. However, gradual increases of x-ray radiation levels due to field emission were observed during long term beam operation. High power pulsed RF conditioning as a cure method was applied in the cool-down period in 2016 and 2017, so that degraded cavity performances have almost recovered up to the previous levels. Performance recovery status in three 2-cell cavities is reported in this paper.