Higher-order mode analysis for SOLEIL-type superconducting cavity
A 499.8 MHz SOLEIL-type superconducting cavity was simulated and designed for the first time in this paper.The higher-order mode(HOM)properties of the cavity were investigated.Two kinds of coaxial HOM couplers were de-signed.Using 4 L-type and 4 T-type HOM couplers,the longitudinal impedance and the transverse impedances were sup-pressed to below 3 kΩ and 30 kΩ/m,respectivly.The HOM damping requirements of Hefei Advanced Light Facility(HALF)were satisfied.This paper conducted an in-depth study on the radio frequency(RF)design,multipacting optimiza-tion,and thermal analysis of these coaxial couplers.Simulation results indicated that under operating acceleration voltage,the optimized couplers does not exhibit multiplicating or thermal breakdown phenomena.The cavity has the potential to reach a higher acceleration gradient.
HOM couplersuperconducting cavityRF systemmultipactingthermal simulation
柴熙源、李秦、许云鹏、唐运盖、谭名昇、吴丛凤
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中国科学技术大学国家同步辐射实验室,安徽合肥 230029
高次模耦合器 超导腔 高频系统 二次电子倍增 热仿真
Fundamental Research Funds for the Central Universities
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