Author: Ooya, K.
Paper Title Page
TUPMP015 Magnet Power Supply Calibration with a Portable Current Measuring Unit at the J-PARC Main Ring 1263
  • K. Miura, Y. Kurimoto, Y. Morita, D. Naito, T. Oogoe, T. Shimogawa
    KEK, Ibaraki, Japan
  • Y. Kuniyasu
    Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
  • K. Ooya
    SANKYU PLANT TECHNO CO., LTD., 6-5-3, Kachidoki, Japan
  • R. Sagawa
    Universal Engineering, Ibaraki-ken, Japan
  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.  
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About • paper received ※ 14 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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