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