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The China Spallation Neutron Source (CSNS) beam power was successfullyreached 125 kW with a low beam loss in February 2022. In order to increase beampower, during the summer in 2022, we employ magnetic-alloy (MA) cavity in therapid cycling synchrotron (RCS). It is a wideband cavity (Q=2), allows thesecond harmonic rf (h= 4) operation, with the existing ferrite cavity torealize the dual-harmonic acceleration. The second harmonic (h=4) is used forthe bunch shape control and alleviating the space charge effects. We design ofthe low-level RF(LLRF) control system for MA cavity, in this paper, we describethe system design and implementation, and the preliminary test results.

Design of the LLRF control system for MA cavity at CSNS RCS