Operation Status and Upgrade Plan of the J-PARC Linac

Abstract

The J-PARC linac has started beam operation to users since 2008. With energy and current upgrade at 2013 and 2014 respectively, the linac provides a nominal peak current of 50 mA beam at an energy of 400 MeV to the following 3 GeV rapid-cycling synchrotron (RCS) since Oct. 2018. The linac is currently operating at the design macro-pulse length of 0.5 ms, which corresponds to 1 MW output from the RCS. Beam studies have been continued to improve beam quality to reduce beam loss. Further beam current/duty upgrades of the linac are currently being considered to achieve beam output beyond 1 MW at RCS and to provide a 400 MeV beam to the test facility through 50 Hz operation of the linac.