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TY - CONF AU - Qiu, F. AU - Arakawa, D.A. AU - Honda, Y. AU - Katagiri, H. AU - Matsumoto, T. AU - Michizono, S. AU - Miura, T. AU - Obina, T. AU - Sakai, H. AU - Wibowo, S.B. ED - Belomestnykh, Sergey ED - Hoffman, Caitlin M. ED - Schaa, Volker RW TI - Performance of the Digital LLRF Systems at KEK cERL J2 - Proc. of ERL2015, Stony Brook, NY, USA, June 7-12, 2015 C1 - Stony Brook, NY, USA T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 56 LA - english AB - A compact energy recovery linac (cERL), which is a test machine for the next generation synchrotron light source 3-GeV ERL, was constructed at KEK. In the cERL, a normal conducting (NC) buncher cavity and three superconducting (SC) two-cell cavities were installed for the injector, and two nine-cell SC cavities were installed for the main linac (ML). The radio-frequency (RF) fluctuations for each cavity are required to be maintained at less than 0.1% rms in amplitude and 0.1° in phase. These requirements are fulfilled by applying digital low-level radio-frequency (LLRF) systems. During the beam-commissioning, the LLRF systems were evaluated and validated. A measured beam momentum jitter of 0.006% shows that the target of the LLRF systems is achieved. To further improve the system performance, an adaptive feedforward (FF) control-based approach was proposed and demonstrated in the beam-commissioning. The current status of LLRF system and the adaptive FF approach for LLRF control in the cERL are presented in this paper. PB - JACoW CP - Geneva, Switzerland SP - 84 EP - 87 KW - LLRF KW - cavity KW - controls KW - linac KW - pick-up DA - 2015/09 PY - 2015 SN - 978-3-95450-183-0 DO - 10.18429/JACoW-ERL2015-WEIDLH2066 UR - http://jacow.org/ERL2015/papers/weidlh2066.pdf ER -