Ultrahigh accelerating gradient and quality factor of CEPC 650 MHz superconducting radio-frequency cavity

Peng Sha; Wei-Min Pan; Song Jin; Ji-Yuan Zhai; Zheng-Hui Mi; Bai-Qi Liu; Chao Dong; Fei-Si He; Rui Ge; Liang-Rui Sun; Shi-Ao Zheng; Ling-Xi Ye

doi:10.1007/s41365-022-01109-8

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Ultrahigh accelerating gradient and quality factor of CEPC 650 MHz superconducting radio-frequency cavity

ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS | Updated：2022-11-22

- Ultrahigh accelerating gradient and quality factor of CEPC 650 MHz superconducting radio-frequency cavity
  Enhanced Publication
- Nuclear Science and Techniques Vol. 33, Issue 10, Article number: 125(2022)
- Affiliations：
  
  1.Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  2.Key Laboratory of Particle Acceleration Physics and Technology, Chinese Academy of Sciences, Beijing 100049, China
  3.Center for Superconducting RF and Cryogenics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  4.University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  shapeng@ihep.ac.cn,
  panwm@ihep.ac.cn
- Funds：
- DOI：10.1007/s41365-022-01109-8
  CLC：
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Peng Sha, Wei-Min Pan, Song Jin, et al. Ultrahigh accelerating gradient and quality factor of CEPC 650 MHz superconducting radio-frequency cavity. [J]. Nuclear Science and Techniques 33(10):125(2022)
DOI：

Peng Sha, Wei-Min Pan, Song Jin, et al. Ultrahigh accelerating gradient and quality factor of CEPC 650 MHz superconducting radio-frequency cavity. [J]. Nuclear Science and Techniques 33(10):125(2022) DOI： 10.1007/s41365-022-01109-8.

摘要

Abstract

Two 650 MHz single-cell superconducting radio-frequency (SRF) cavities used for the Circular Electron Positron Collider (CEPC) were studied to achieve a high accelerating gradient (,E,acc,) and high intrinsic quality factor (,Q,0,). The 650 MHz single-cell cavities were subjected to a combination of buffered chemical polishing (BCP) and electropolishing (EP), and their ,E,acc, exceeded 40 MV/m. Such a high ,E,acc, may result from the cold EP with more uniform removal. BCP is easy, cheap, and rough, whereas EP is complicated, expensive, and precise. Therefore, the combination of BCP and EP investigated in this study is suitable for surface treatments of mass SRF cavities. Medium temperature (mid-T) furnace baking was also conducted, which demonstrated an ultrahigh ,Q,0, of 8 × 10,10, at 22 MV/m for both cavities, and an extremely low BCS resistance (,R,BCS,) of ~ 1.0 nΩ was achieved at 2.0 K.

关键词

Keywords

SRF cavityAccelerating gradientQuality factorElectropolishingVertical test

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Nitrogen doping/infusion of 650 MHz cavities for CEPC

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