| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Successful Nitrogen Doping of 1.3GHz Single Cell Superconducting Radio-Frequency Cavities |
| Shu Chen, Jian-Kui Hao**, Lin Lin, Feng Zhu, Li-Wen Feng, Fang Wang, Hua-Mu Xie, Xin Guo, Meng Chen, Sheng-Wen Quan, Ke-Xin Liu |
State Key Laboratory of Nuclear Physics and Technology & Institute of Heavy Ion Physics, Peking University, Beijing 100871
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| Cite this article: |
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Shu Chen, Jian-Kui Hao, Lin Lin et al 2018 Chin. Phys. Lett. 35 037401 |
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Abstract A high intrinsic quality factor ($Q_{0}$) of a superconducting radio-frequency cavity is beneficial to reducing the operation costs of superconducting accelerators. Nitrogen doping (N-doping) has been demonstrated as a useful way to improve $Q_{0}$ of the superconducting cavity in recent years. N-doping researches with 1.3 GHz single cell cavities are carried out at Peking University and the preliminary results are promising. Our recipe is slightly different from other laboratories. After 250 μm polishing, high pressure rinsing and 3 h high temperature annealing, the cavities are nitrogen doped at 2.7–4.0 Pa for 20 min and then followed by 15 μm electropolishing. Vertical test results show that $Q_{0}$ of a 1.3 GHz single cell cavity made of large grain niobium has increased to $4\times10^{10}$ at 2.0 K and medium gradient.
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Received: 13 November 2017
Published: 25 February 2018
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| PACS: |
74.25.nn
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(Surface impedance)
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29.20.Ej
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(Linear accelerators)
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74.62.Dh
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(Effects of crystal defects, doping and substitution)
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| Fund: Supported by the National Key Program for S&T Research and Development under Grant No 2016YFA0400400, and the National Natural Science Foundation of China under Grant No 11575012. |
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