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TY - CONF AU - Liu, Z.K. AU - Chang, F.Y. AU - Chang, L.-H. AU - Chang, M.H. AU - Chang, S.W. AU - Chen, L.J. AU - Chung, F.-T. AU - Li, Y.T. AU - Lin, M.-C. AU - Lo, C.H. AU - Wang, Ch. AU - Yeh, M.-S. AU - Yu, T.-C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Study of the System Stability for the Digital Low Level RF System Operated at High Beam Currents J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The purpose of a Low-Level Radio Frequency (LLRF) system is to control the amplitude and phase of the field in the accelerating cavity. A digital LLRF (DLLRF) system will be installed in the Taiwan Photon Source (TPS) storage ring in 2019. The system stability depends much on the feedback parameters. An instability of the cavity voltage controlled by a DLLRF was observed during machine tests with high beam current and low feedback gain. A simulation model for the digital LLRF system with beam-cavity interaction was developed to investigate this instability and simulations and machine test results will be presented here. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4042 EP - 4044 KW - cavity KW - LLRF KW - controls KW - feedback KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB094 UR - http://jacow.org/ipac2019/papers/thprb094.pdf ER -