FFAG proton driver for muon source

Fixed field alternating gradient (FFAG) focusing synchrotron is attractive as a proton driver for the generation of intense secondary particles such as muons. The magnetic field of the FFAG synchrotron is static, therefore, the repetition rate of acceleration could be increased more than ten times larger, such as 1 kHz, than that of an ordinary rapid cycling synchrotron (RCS) if an efficient high-voltage rf accelerating system becomes available. Recently, a new type of high gradient and broad-band rf cavity using a high-permeability magnetic alloy (MA) has been developed and the FFAG focusing becomes very promising. In this paper, a design of 1.5 GeV and 10 MW beam power of proton driver is presented. In order to clarify the feasibility of rapid cycling FFAG synchrotron experimentally, a proof-of-principle (POP) machine, which accelerates protons up to 1 MeV with 1 kHz repetition, is under development.