CERN Accelerating science

Article
Title	Power Supply for Magnet of Compact Proton and/or Heavy Ion Synchrotron for Radiotherapy
Author(s)	Yamanaka, Shinji ; Egawa, Kazumi ; Endo, Kuninori ; Fang, Zhigao
Affiliation	(KEK, Ibaraki) ; (NIRS, Chiba-shi)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3859
Subject category	Accelerators and Storage Rings
Abstract	A resonant type pulse power supply, for an application to a compact proton and/or heavy ion synchrotron with a several Hz repetition rate, is attractive from the view point of attaining an average beam current that is enough for the radiation therapy. Maximum ampere-turn of the dipole magnet is as large as 200 kAT to make the bending radius as small as possible. Pulse current is generated by discharging the stored energy in a capacitor bank through a pulse transformer. Moreover, the auxiliary power supply for the dipole magnets which adds the flat magnetic field (10-20μs) for the multi-turn beam-injection is being developed. The power supply for the quadrupole magnets is the high switching frequency (20 kHz × 5) switching-mode Power Supply for the adjusting tune and the tracking between the quadrupole and the dipole fields.Detailed analyses on these pulse power supplies will be presented.