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Nitrogen doping/infusion of 650 MHz cavities for CEPC

Authors
  • Sha, Peng1, 1, 1, 2
  • Hao, Jian-Kui3
  • Pan, Wei-Min1, 1, 1, 2
  • Lin, Lin3
  • Zheng, Hong-Juan1, 1, 1
  • Zhang, Xin-Ying1, 1, 1, 2
  • Wang, Fang3
  • Zhai, Ji-Yuan1, 1, 1, 2
  • Mi, Zheng-Hui1, 1, 1, 2
  • He, Fei-Si1, 1, 1, 2
  • Chen, Shu3
  • Liu, Bai-Qi1, 1, 1
  • Yang, Zhi-Tao3
  • Dong, Chao1, 1, 1
  • Li, Zhong-Quan1, 1, 1, 2
  • 1 Chinese Academy of Sciences, Beijing, 100049, China , Beijing (China)
  • 2 University of Chinese Academy of Sciences, Beijing, 100049, China , Beijing (China)
  • 3 Peking University, Beijing, 100871, China , Beijing (China)
Type
Published Article
Journal
Nuclear Science and Techniques
Publisher
Springer-Verlag
Publication Date
May 08, 2021
Volume
32
Issue
5
Identifiers
DOI: 10.1007/s41365-021-00881-3
Source
Springer Nature
Keywords
License
Yellow

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 × 1010 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 (Q0) reached 6 × 1010 at 22 MV/m in the vertical test, and the maximum gradient is 25 MV/m, which exceeds the specification of the CEPC (4 × 1010 at 22 MV/m).

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