Design and Optimization of HOM Damping for the S3FEL 3.9-GHz TESLA Superconducting Cavity

IF 1.7 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-26 DOI:10.1109/TASC.2025.3554349

Ruomeng Ying;Zixuan Du;Yunsheng Li;Zhenchao Liu;Sheng Wang;Weiming Yue

引用次数: 0

Abstract

The Shenzhen medium-energy high-repetition-rate X-ray free-electron laser (S³FEL) will be the first medium-energy X-ray free-electron laser operating at megahertz repetition rates worldwide. The facility is equipped with 24 sets of 1.3-GHz superconducting acceleration modules for energy acceleration by fundamental wave and two sets of 3.9-GHz superconducting acceleration modules to compensate for the nonlinear longitudinal spatial distortion caused by the curvature of the acceleration field. We optimize the radio-frequency design of the S³FEL 3.9-GHz TESLA superconducting cavity by changing the size of the higher-order-mode (HOM) coupler to decrease R/Q and external Q, ensuring continuous-wave operation. Furthermore, we evaluated the dangerous modes of the cavity to fulfill the design requirements for safety and calculated the HOM power loss of the cavity using the Azimuthal beam cavity interaction.

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S3FEL 3.9 ghz TESLA超导腔HOM阻尼设计与优化

深圳中能量高重复率x射线自由电子激光器（S3FEL）将是世界上第一台以兆赫兹重复率工作的中能量x射线自由电子激光器。该设施配备24组1.3 ghz超导加速模块用于基波能量加速，2组3.9 ghz超导加速模块用于补偿加速场曲率引起的非线性纵向空间畸变。我们优化了S3FEL 3.9 ghz TESLA超导腔的射频设计，通过改变高阶模式（HOM）耦合器的尺寸来降低R/Q和外部Q，确保连续波工作。此外，为了满足设计的安全要求，我们对腔体的危险模态进行了评估，并利用方位角光束腔体相互作用计算了腔体的HOM功率损失。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Applied Superconductivity 工程技术-工程：电子与电气

CiteScore

3.50

自引率

33.30%

发文量

650

审稿时长

2.3 months

期刊介绍： IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.