DEVELOPMENT OF THE PULSE MAGNETS FOR THE BOOSTER SYNCHROTRON OF SPRING-8

Injection and extraction scheme of the Spring-8 synchrotron was designed. One kicker magnet, two septum magnets and one bump magnet which will be installed in the synchrotron to eject the electron beam of 8 GeV were tested and successfully completed. I. INTRODUCTION The Spring-8 synchrotron is required that the synchrotron accepts the electron beam of 1 GeV from the SF’ring-8 linac, accelerates the beam energy upto 8 GeV and ejects the electron beam to make stacking into the SPring-8 storage ring with the repetition period of 1s. In multi-bunch mode-operation of the ring, the long-pulse electron-beam which has macro-bunch length of 1ps from the linac is accepted in half-number, continus buckets of the synchrotron. The beam train of lps is handled as a continuos beam in the synchrotron. In a single-bunch mode-operation, the synchrotron accepts the short-pulse beam which has macrobunch length less than Ins from the linac corresponding to one bucket length of the synchrotron. Moreover, the synchrotron is required to improve the beam current of the single-bunch modeoperation at the stacking of the ring. And 8 buckets of the synchrotron are occupied by the short-pulse beam from the linac and every spacings between the two buckets which are neighbor are the same length. And the electrons which occupy the 8 buckets are injected in a single bucket of the ring with contolling the time schedule of trigger signals for the electron gun of the linac and the pulse magnets of the injection and extraction systems of the synchrotron.