Phase synchronization of multi-network system for resonant excitation of the JHF 3-GeV booster magnets

In the Japan Hadron Facility (JHF), the 3-GeV booster is planned to be a 25 Hz rapid cycling separated-function synchrotron. To achieve a stable acceleration, the tune variation due to tracking errors is required to be less than 0.01. Since the White-circuit is adopted with a pulse power supply as its AC source, the relative phase difference of multi-network field becomes one of the main causes of the tune errors and should be minimized. The tolerable phase shift is estimated to be 0.8 mrad. This paper describes a scheme to synchronize the multi-network excitation. A circuit for phase feedback is implemented and experimental results are presented