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TY - UNPB AU - Miyajima, T. ED - Meseck, Atoosa ED - McAteer, Meghan ED - Schaa, Volker R.W. ED - V\xF6lker, Jens TI - Compact ERL (cERL), Stable 1 mA Operation with a Small Beam Emittance 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 - The compact ERL (cERL) at KEK is a test accelerator to develop ERL technologies for high average beam current operation with high quality beam performance. The cERL consists of a photoinjector, a main linac for energy recovery, a recirculation loop and a beam dump. In order to achieve energy recovery operation with high average beam current, collimator tuning to reduce un-wanted beam loss was very important. After fine beam tuning and collimator tuning, we succeeded in CW operation with 0.9 mA average beam current, and it was very stable in two hours in June 2018. The emittances were measured in the injector and the recirculation loop by waist scan method, and they were close to the design emittance. In order to increase CW beam current to 10 mA, we are preparing the improvement of instrumentations. PB - JACoW Publishing CP - Geneva, Switzerland ER -