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TY - CONF AU - Miura, K. AU - Kuniyasu, Y. AU - Kurimoto, Y. AU - Morita, Y. AU - Naito, D. AU - Oogoe, T. AU - Ooya, K. AU - Sagawa, R. AU - Shimogawa, T. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Magnet Power Supply Calibration with a Portable Current Measuring Unit at the J-PARC Main Ring J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In the J-PARC MR, 96 bending magnets (BMs) are used in total. They are divided into 6 groups of 16 BMs. The 16 BMs in each group are connected in series and driven by a single power supply. Since all 96 BMs are symmetrically located in the ring, the magnet currents regulated by the 6 power supplies need to be same. Each power supply performs output current feedback control using electronic circuits including analog amplifications and AD / DA conversions. Due to individual differences of the electronic circuits, output current is generally expected to be different for each power supply. Therefore, we developed a current measurement unit with the portable DCCT as an independent reference. Further, we measured the magnet currents regulated by the 6 BM power supplies using the unit. We report the details of the unit as well as the results of the current measurements. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1263 EP - 1265 KW - power-supply KW - feedback KW - operation KW - timing KW - controls DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPMP015 UR - http://jacow.org/ipac2019/papers/tupmp015.pdf ER -