THE PULSED MAGNET SYSTEM FOR THE SIMULTANEOUS INJECTION OF KEK-PF AND KEKB RING

The KEK Linac delivers the beam to KEK Photon factory storage ring (PF), KEKB ring and the advanced ring for photon factory (PF-AR). In order to deliver the beam to the KEK-photon factory and KEKB ring simultaneously, the pulsed bending magnet was installed at the end of KEKB Linac. The pulsed bending magnet extract 2.5GeV electron beam to the PF beam transfers line. The deflection angle of the magnet is 0.114 radians and the field strength is about 1.22T. The peak current stability is better than 0.1% at 24kA operation. The maximum repetition rate is 25Hz. The 1.3m long ceramic chamber is inserted into the 1m long magnet. This system makes possible the top up operation of PF ring.