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TY - CONF AU - Birke, T. AU - Falkenstern, F. AU - Müller, R. AU - Schälicke, A. ED - Corvetti, Lou ED - Riches, Kathleen ED - Schaa, Volker RW TI - Drift Control Engines Stabilize Top-Up Operation at BESSY II 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 - Full stability potential of orbit and bunch-by-bunch-feedback controlled top-up operation becomes available to the experimental users only if the remaining slow drifts of essential operational parameters are properly compensated. At the light source BESSY II these are the transversal tunes as well as the path length and energy. These compensations are realized using feedback control loops together with supervising state machines. Key to the tune control is a multi-source tune determination algorithm. For the path length correction empirical findings are utilized. All involved software systems and data-paths are sketched. PB - JACoW CP - Geneva, Switzerland SP - 262 EP - 265 KW - feedback KW - controls KW - injection KW - operation KW - experiment DA - 2015/12 PY - 2015 SN - 978-3-95450-148-9 DO - 10.18429/JACoW-ICALEPCS2015-MOPGF077 UR - http://jacow.org/icalepcs2015/papers/mopgf077.pdf ER -