Simulation of a 1 500 MHz 5-cell superconducting cavity

YANG Jun; MA Zhenyu; WANG Yan; HOU Hongtao; LI Zheng; LUO Chen; MAO Dongqing; SHI Jing; LIU Jianfei

doi:10.11889/j.0253-3219.2015.hjs.38.060103

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Simulation of a 1 500 MHz 5-cell superconducting cavity

更新时间：2021-03-03

- Simulation of a 1 500 MHz 5-cell superconducting cavity
- NUCLEAR TECHNIQUES Vol. 38, Issue 6, Article number: 060103(2015)
- 作者机构：
  
  1. 中国科学院上海应用物理研究所嘉定园区,上海,201800
  2. 中国科学院大学,北京,100049
  3. 上海市低温超导高频腔技术重点实验室,上海,201800
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.060103
  CLC：
- Published：05 June 2015
- 稿件说明：
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YANG Jun, MA Zhenyu, WANG Yan, et al. Simulation of a 1 500 MHz 5-cell superconducting cavity[J]. Nuclear techniques, 2015, 38(6): 060103
DOI：

YANG Jun, MA Zhenyu, WANG Yan, et al. Simulation of a 1 500 MHz 5-cell superconducting cavity[J]. Nuclear techniques, 2015, 38(6): 060103 DOI： 10.11889/j.0253-3219.2015.hjs.38.060103.

摘要

能量回收直线加速器技术是近年来一项重要技术。针对能量回收直线加速器的主直线加速器，本文使用多种射频软件优化设计了一种新型的1 500 MHz 5-cell超导腔。该腔加速模TM010的R/Q值达到550Ω，可以有效降低低温损耗。该腔的端cell采用扩大束管传输有害高次模方案将高次模传输出超导腔，良好地抑制了高次模。新腔型保持了较低的表面峰值场强与平均加速梯度的比值：Epk/Eacc=2.06，Bpk/Eacc =4.22 mT/(MV?m?1)，避免了场致发射的风险，并且在中等加速梯度区域(15?20 MV?m?1)无二次电子倍增现象。模拟结果显示，该超导腔能够满足连续波、准连续波或高重复频率稳定运行的要求。

Abstract

Background: Energy Recovery Linacs (ERLs) are being developed over the world to realize future light sources and other applications. Purpose: The aim is to design a new 1 500 MHz 5-cell superconducting cavity for main linac in the ERL. Methods: The new cavity geometry was optimized by several radio-frequency softwares. Results: The new cavity is endowed with the following advantages: with the R/Q of the fundamental mode TM010 to be 550 ?

cryogenic losses could be reduced effectively; in order to reduce the risk of field emission

the parameters Epk/Eacc

Bpk/Eacc were optimized respectively to 2.06 and 4.22; a larger beam pipe was employed to propagate the higher order modes (HOMs) out of the cavity

increasing the damping efficiently for the dangerous HOMs. Conclusion: It was found that radio frequency property of the new cavity could meet the requirements of ERL-based Free Electron Laser (FEL) very well. Abstract

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