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TY - CONF AU - Singh, R. AU - Bardorfer, A. AU - Doring, A. AU - Forck, P. AU - Lang, K. AU - Mirza, S.H. AU - Rodomonti, D. AU - Schupp, D. AU - Schwickert, M. AU - Welker, H. ED - Schaa, Volker RW ED - Jansson, Andreas ED - Shea, Thomas ED - Olander, Johan TI - First Beam-based Test of Fast Closed Orbit Feedback System at GSI SIS18 J2 - Proc. of IBIC2019, Malmö, Sweden, 08-12 September 2019 CY - Malmö, Sweden T2 - International Beam Instrumentation Conferenc T3 - 8 LA - english AB - The SIS18 synchrotron of GSI will be used as a booster ring for the SIS100 synchrotron built in the scope of the FAIR project. In order to preserve the beam quality during the whole acceleration ramp, a new closed orbit feedback (COFB) system is implemented at the SIS18 which operates with the existing BPMs and steerer magnets. The system aims for a bandwidth of several 100 Hz and robustness against the variation of the response matrix and the beam rigidity during the ramp. The architecture of the system and the results of the first beam-based test of the COFB hardware are presented. As a first step, the orbit correction is performed over the entire ramp using the response matrix corresponding to injection energy only taking the beam rigidity into account. Experimental observations of the bandwidth limitations arising from the temporal delay of the steerer power supplies and the spatial model variation during the ramp are compared with simulations. It is found that the temporal and the spatial model mismatch have similar effect on the achievable bandwidth of the COFB. PB - JACoW Publishing CP - Geneva, Switzerland SP - 154 EP - 158 KW - controls KW - feedback KW - closed-orbit KW - acceleration KW - synchrotron DA - 2019/11 PY - 2019 SN - 2673-5350 SN - 978-3-95450-204-2 DO - doi:10.18429/JACoW-IBIC2019-MOPP027 UR - http://jacow.org/ibic2019/papers/mopp027.pdf ER -