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TY - CONF AU - Gayadeen, S. AU - Heron, M.T. AU - Rehm, G. ED - Corvetti, Lou ED - Riches, Kathleen ED - Schaa, Volker RW TI - Robust Stability Analysis of Orbit Feedback Controllers J2 - Proc. of ICALEPCS2015, Melbourne, Australia, 17-23 October 2015 C1 - Melbourne, Australia T2 - International Conference on Accelerator and Large Experimental Physics Control Systems T3 - 15 LA - english AB - Closed loop stability of electron orbit feedback controllers is affected by mismatches between the accelerator model and the real machine. In this paper, the small gain theorem is used to express analytical criteria for closed loop stability in the presence of spatial uncertainty. It is also demonstrated how the structure of the uncertainty models affects the conservativeness of the robust stability results. The robust stability criteria are applied to the Diamond Light Source electron orbit controller and bounds on the allowable size of spatial uncertainties which guarantee closed loop stability is determined. PB - JACoW CP - Geneva, Switzerland SP - 502 EP - 505 KW - controls KW - feedback KW - electron DA - 2015/12 PY - 2015 SN - 978-3-95450-148-9 DO - 10.18429/JACoW-ICALEPCS2015-MOPGF177 UR - http://jacow.org/icalepcs2015/papers/mopgf177.pdf ER -