Synchronous Transfer of Beam from the Booster to the Main Ring in the KEK Proton Synchrotron

The KEK main ring is filled with nine successive beam pulses from the fast cycling booster synchrotron during the injection. Booster bunches are synchronously transferred into stationary rf buckets of the main ring preserving the booster rf structure. At the transfer, longitudinal phase and momentum of the beam bunch extracted from the booster are matched to those defined in the main ring within errors of ???????? ~ 10?? and ????p/p?? ~4 ?? 10-4.