@misc{oai:repo.qst.go.jp:00070265,
 author = {Katagiri, Ken and 片桐 健},
 month = {Sep},
 note = {In order to realize a precise dose distribution in heavy-ion cancer therapy, a high beam stability is required for the accelerator complex. Owing to load fluctuation caused by a upper ring, which is one of the two rings in HIMAC, current dips of ≈ 5 – 10 Hz are observed in the power supply for the bending/quadrupole magnet of the other lower ring. The parameters of the beam stability, such as the spill variation, the beam position, and the size, are adversely affected by the current dips. In order to suppress these current dips, we developed a new feed-forward system in the magnet power supply. We verified the performance of the feed-forward system by measuring the suppression of the current dips. We also performed beam experiments to measure the variation of the horizontal tune and the structure of the beam spill, which is slowly extracted by the resonance method. The experimental result showed that the current dips were successfully reduced to be I/I ~ 10-6 by the system. It was also confirmed that the horizontal tune and the spill structure could be stabilized by the current dip suppression., ECAART10},
 title = {Beam stability improvement of HIMAC synchrotronu sing a feed-forward system for magnet power supplies},
 year = {2010}
}