FERRITE PROPERTY EFFECTS ON A FAST KICKER MAGNET

The present J-PARC main ring (MR) injection system employs four lumped kicker magnets. Their task is to injection two bunches per cycle from the Rapid Cycling Synchrotron to the defined bucket in the MR. The operation must be loss-free to avoid any damage to the accelerator. However, the present injection kicker’s field have relatively long rise time and large reflection field that do not satisfy the requirements of high beam power operation. Besides the upgrade of the main kickers, two small fast compensation kickers are being studied in parallel to correct the main kicker performance. Since high magnetization rates in magnetic materials are associated with considerable magnetic losses, high quality Nickel Zinc ferrite magnetic materials are required to ensure the performance of the compensation kickers. Therefore, the studies of ferrite materials effects on the parameters of both compensation kickers have carried out to optimize the design