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TY - CONF AU - Masaki, M. AU - Dewa, H. AU - Fujita, T. AU - Fukui, T. AU - Kubota, K. AU - Maesaka, H. AU - Soutome, K. AU - Sugimoto, T. AU - Takano, S. AU - Takeuchi, M.T. AU - Tanaka, H. AU - Watanabe, T. ED - Forck, Peter ED - Wawrzyniak, Adriana ED - Schaa, Volker R.W. ED - Kowalski, Grzegorz W. ED - Cudek, Agnieszka (SOLARIS, Kraków TI - Adaptive Feedforward Control of Closed Orbit Distortion Caused by Fast Helicity-Switching Undulators J2 - Proc. of IBIC2022, Kraków, Poland, 11-15 September 2022 CY - Kraków, Poland T2 - International Beam Instrumentation Conference T3 - 11 LA - english AB - We developed a new correction algorithm for closed orbit distortion (COD) based on adaptive feedforward control (AFC). The AFC system effectively works for the suppression of the fast COD due to known error sources with repetitive patterns such as helicity-switching undulators. The scheme aims to counteract error sources by feedforward correctors at the position or in the vicinity of error sources so that a potential risk of unwanted local orbit bumps, which is known to exist for the global orbit feedback, can be eliminated in a reliable and accurate manner. This option is especially advantageous when an error source causes an angular distortion of photon beams such as a fast orbit distortion near undulators. Thus, the AFC provides a complementary capability to a so-called fast global orbit feedback (FOFB) for coming next-generation light sources where ultimate light source stability is essentially demanded. In this talk, introduction to the AFC, its theoretical aspect and advantages, the system overview, the experimental results for the effects of AFC will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 374 EP - 378 KW - kicker KW - undulator KW - controls KW - experiment KW - storage-ring DA - 2022/12 PY - 2022 SN - 2673-5350 SN - 978-3-95450-241-7 DO - doi:10.18429/JACoW-IBIC2022-WE2I3 UR - https://jacow.org/ibic2022/papers/we2i3.pdf ER -