Induction synchrotron and a POP experiment in the KEK 12G[lc]eV-PS

Abstract

Key devices for an induction synchrotron and the recently proposed Superbunch Hadron Colliders are a rapidly switched induction acceleration cell and its modulator. These induction acceleration devices and all solid-state power modulators are being developed under collaboration between KEK, Tokyo Institute of Technology, Nichicon, NGK Insulators, and Hitachi Metals. The modulator must switch a peak voltage of 2 to 3 kV with a pulse repetition rate of 100 kHz to 1 MHz. An effective pulse duration of 1 microsecond is required for acceleration. At the same time, a shorter time-duration of 40 to 100 nsec is required to generate a barrier bucket and to achieve a long superbunch. After careful core-loss measurements for various magnetic-core materials and selection of switching elements, several prototypes of the induction module and modulator have been assembled and successfully operated at 1 MHz with a burst of 10 pulses. Currently a practical device capable of being operated in the 1 MHz CW mode is under assembling, which is being installed in the KEK 12 GeV-PS. Its operational results will be presented at the conference.