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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 - Comprehensive Fill Pattern Control Engine: Key to Top-Up Operation Quality 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 - At the light source BESSY II numerous experiments as well as machine development studies benefit from a very flexible and stable fill pattern: standard operation mode comprises a multibunch train for the average users, a purity controlled high current camshaft bunch in a variable length ion clearing gap for pump/probe experiments and a mechanical pulse picking chopper, three high current bunches for femto second slicing opposite to the gap and a specific bunch close to the end of the ion clearing gap for resonant excitation pulse picking. The fill pattern generator and control software is based on a state machine. It controls the full chain from gun timing, linac pulse trains, injection and extraction elements as well as next shot predictions allowing triggering the next DAQ cycle. Architecture and interplay of the software components as well as implemented functionality with respect to hardware control, performance surveillance and reasoning of next actions, radiation protection requirements are described. PB - JACoW CP - Geneva, Switzerland SP - 18 EP - 21 KW - injection KW - controls KW - operation KW - experiment KW - radiation DA - 2015/12 PY - 2015 SN - 978-3-95450-148-9 DO - 10.18429/JACoW-ICALEPCS2015-MOC3O01 UR - http://jacow.org/icalepcs2015/papers/moc3o01.pdf ER -