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Description
The CSNS FFA project requires an RF system operating in the 2.598–3.163 MHz frequency range, providing an accelerating voltage of 300 kV/turn to accelerate the beam from 300 MeV to 600 MeV, with the bunch length compressed to approximately 5 ns. To meet the wideband and high-gradient requirements, a magnetic alloy (MA)-loaded cavity has been adopted. This contribution reports recent progress on the FFA MA-loaded cavity RF system, including cavity structure design, large-scale race-track MA core development, direct water cooling for high power loss under high gradient, and power source design with tetrode operation analysis to address heavy beam loading at a circulating current of 10.5 A. Simulation results from electromagnetic, thermal-fluid, and tube operation studies are presented. The future plan for RF system prototype development will also be discussed.