Higher-order mode analysis for SOLEIL-type superconducting cavity  

SOLEIL型超导腔的高次模分析研究

作　　者：Xiyuan Chai Qin Li Yunpeng Xu Yungai Tang Mingsheng Tan Cong-Feng Wu 柴熙源;李秦;许云鹏;唐运盖;谭名昇;吴丛凤(中国科学技术大学国家同步辐射实验室,安徽合肥230029)

机构地区：[1]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China

出　　处：《中国科学技术大学学报》2024年第7期56-65,55,I0003,共12页JUSTC

基　　金：supported by the Fundamental Research Funds for the Central Universities(WK2310000098).

摘　　要：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 designed.Using 4 L-type and 4 T-type HOM couplers,the longitudinal impedance and the transverse impedances were suppressed to below 3 kΩand 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 optimization,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.本文首次仿真设计了一种499.8 MHz SOLEIL型超导腔。着重研究了其高次模性能并为之设计了两种同轴型高次模耦合器。在使用了4只L型和4只T型高次模耦合器后,其纵向和横向阻抗分别被抑制在3 kΩ和30 kΩ/m以下。这充分满足了合肥先进光源HALF的高次模性能需求。本文深入地开展了同轴型耦合器的微波性能设计、二次电子倍增性能优化以及热分析。最终仿真结果表明,在正常运行腔压下优化后的设计不会出现二次电子倍增效应和热失超现象。该超导腔具有达到更高加速梯度的潜力。

关 键 词：HOM coupler superconducting cavity RF system multipacting thermal simulation 

分 类 号：TL544[核科学技术—核技术及应用]