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TY - CONF AU - Nakamura, S. AU - Kurimoto, Y. AU - Morita, Y. AU - Shimogawa, T. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Power Supplies for Main Magnet of J-PARC Main Ring J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - A large magnetic field ripple of the order of 10⁻² were observed at the first beam commissioning of J-PARC main ring in 2008, To eliminate the ripple, we had improved the magnet power supplies by reconstructing a trap-filter of 600 Hz and adopting an additional DCCT. We made differencial circuit and symmetrical wiring for all magnets. On the other hand, acceleration period was reduced from 2.5 s to 1.4 s for increasing the beam power with feedforward control. We summarize the improvements of the magnet power supplies in this paper. PB - JACoW CP - Geneva, Switzerland SP - 3534 EP - 3536 KW - power-supply KW - controls KW - acceleration KW - experiment KW - extraction DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-THPMW002 UR - http://jacow.org/ipac2016/papers/thpmw002.pdf ER -