Nitrogen doping/infusion of 650 MHz cavities for CEPC

Peng Sha; Jian-Kui Hao; Wei-Min Pan; Lin Lin; Hong-Juan Zheng; Xin-Ying Zhang; Fang Wang; Ji-Yuan Zhai; Zheng-Hui Mi; Fei-Si He; Shu Chen; Bai-Qi Liu; Zhi-Tao Yang; Chao Dong; Zhong-Quan Li

doi:10.1007/s41365-021-00881-3

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Nitrogen doping/infusion of 650 MHz cavities for CEPC

ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS | Updated：2021-06-04

- Nitrogen doping/infusion of 650 MHz cavities for CEPC
  Enhanced Publication
- Nuclear Science and Techniques Vol. 32, Issue 5, Article number: 45(2021)
- Affiliations：
  
  1.State Key Laboratory of Nuclear Physics and Technology & Institute of Heavy Ion Physics, Peking University, Beijing 100871, China
  2.Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  3.Key Laboratory of Particle Acceleration Physics and Technology, Chinese Academy of Sciences, Beijing 100049, China
  4.Center for Superconducting RF and Cryogenics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  5.University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  shapeng@ihep.ac.cn
  Corresponding author. E-mail address: jkhao@pku.edu.cn
- Funds：
- DOI：10.1007/s41365-021-00881-3
  CLC：
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Peng Sha, Jian-Kui Hao, Wei-Min Pan, et al. Nitrogen doping/infusion of 650 MHz cavities for CEPC. [J]. Nuclear Science and Techniques 32(5):45(2021)
DOI：

Peng Sha, Jian-Kui Hao, Wei-Min Pan, et al. Nitrogen doping/infusion of 650 MHz cavities for CEPC. [J]. Nuclear Science and Techniques 32(5):45(2021) DOI： 10.1007/s41365-021-00881-3.

摘要

Abstract

The nitrogen doping/infusion of 650 MHz cavities for the circular electron positron collider (CEPC) is investigated in this study. Two 650 MHz 1-cell cavities are first treated via buffered chemical polishing (BCP), followed by nitrogen doping. A "2/6" condition is adopted, similar to that for 1.3 GHz cavities of Linear Coherent Light Source II. The quality factor of both cavities improved to 7 × 10,10, in low fields, i.e., higher than that obtained from the baseline test. One 650 MHz two-cell cavity is nitrogen infused at 165 °C for 48 h with a BCP surface base. The intrinsic quality factor (,Q,0,) reached 6 × 10,10, at 22 MV/m in the vertical test, and the maximum gradient is 25 MV/m, which exceeds the specification of the CEPC (4 × 10,10, at 22 MV/m).

关键词

Keywords

Superconducting radio frequency cavityNitrogen dopingNitrogen infusionQuality factorAccelerating gradient

references

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

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