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TY - CONF AU - Iwasaki, Y. AU - Kaneyasu, T. AU - Koda, S. AU - Takabayashi, Y. ED - Corvetti, Lou ED - Riches, Kathleen ED - Schaa, Volker RW TI - Update of Power Supply Control System at the SAGA Light Source Storage Ring 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 - The update of control system at the SAGA Light Source storage ring power supplies is in progress for improving the ramp-up speed (from 255 MeV to 1.4 GeV) and for easily changing the stored beam energy. By replacing the CPU unit of PLC used for control of the power supplies, the ramp-up time was reduced from 4 to 2 minutes in a test bench prepared for the upgrade system. Currently the allowable beam energy is restricted to some fixed values in the ramp-up operation due to the original specification of the PLC ladder program. To operate storage ring at an arbitrary energy, the algorism used in the PLC program has been improvement. Energy dependent measurements (betatron-tune, beam size, and beam half-lifetime) will be carried out by using the updated control system. The upper layer of the control system using the National Instrument LabVIEW and ActiveXCA was also reconstructed for flexible GUI. PB - JACoW CP - Geneva, Switzerland SP - 137 EP - 139 KW - controls KW - storage-ring KW - PLC KW - target KW - power-supply DA - 2015/12 PY - 2015 SN - 978-3-95450-148-9 DO - 10.18429/JACoW-ICALEPCS2015-MOPGF023 UR - http://jacow.org/icalepcs2015/papers/mopgf023.pdf ER -