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TY - UNPB AU - Liu, H.Y. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - Design and Beam Commissioning of Dual Harmonic RF System in CSNS RCS J2 - presented at SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - The design average beam power of the China Spallation Neutron Source (CSNS) is 100 kW, which was achieved in February 2020 and reached 125 kW in March 2022. Building upon this, CSNS plans to increase the average beam power to 200 kW, doubling the circulating beam intensity of the Rapid Cycling Synchrotron (RCS) while keeping the injected energy constant. Space charge effects are important factors that limit the current intensity of high-power particle accelerators. To reduce the increase in beam emittance and beam loss caused by space charge effects, CSNS added a magnetic alloy RF cavity to the RCS in the summer of 2022. This cavity, together with the existing ferrite cavity, forms a dual-harmonic RF system to optimize the longitudinal beam distribution, increase the bunching factor, and mitigate space charge effects. This talk will focus on the beam tuning and simulation results of the CSNS RCS after the installation of the magnetic alloy-loaded high-frequency cavity. ER -