| NUCLEAR PHYSICS |
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Low-Temperature Baking Effect of the Radio-Frequency Nb$_{3}$Sn Thin Film Superconducting Cavity |
| Ziqin Yang1*, Shichun Huang1, Yuan He1*, Xiangyang Lu2, Hao Guo1, Chunlong Li1, Xiaofei Niu1, Pingran Xiong1, Yukun Song1, Andong Wu1, Bin Xie1, Zhiming You1, Qingwei Chu1, Teng Tan1, Feng Pan1, Ming Lu1,3, Didi Luo1, Junhui Zhang1, Shenghu Zhang1, and Wenlong Zhan1 |
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
3University of Chinese Academy of Sciences, Beijing 100049, China
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| Cite this article: |
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Ziqin Yang, Shichun Huang, Yuan He et al 2021 Chin. Phys. Lett. 38 092901 |
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Abstract The Nb$_{3}$Sn thin film cavity, having the potential to be operated at a higher temperature and higher gradient compared to the cavity made from bulk niobium, is one of the most promising key technologies for the next-generation radio-frequency superconducting accelerators. In our work, several 1.3 GHz single-cell TESLA-shaped Nb$_{3}$Sn thin film cavities, coated by the vapor diffusion method, were tested at Peking University and Institute of Modern Physics, Chinese Academy of Sciences. It was observed that the performance of the Nb$_{3}$Sn thin film cavities in the tests without the slow cooling down procedure and the effective magnetic field shielding was significantly improved by using a low temperature baking at 100 ℃ for 48 hours. Although the peak electric field of the cavity remained unchanged, the rapid drop of the unloaded $Q$ value ($Q_{0}$) with the increasing accelerating field ($Q$-slope) was effectively eliminated, resulting in an improvement of the $Q_{0}$ in the intermediate field region by $\sim $8 times. Furthermore, under better test conditions with the shielded magnetic field less than 5 mG and the slow cooling down procedure in the temperature range of 25–15 K, the $Q_{0}$ was still improved by about 20%. Our study shows that the low temperature baking can be an effective supplement to the effective post-treatment for the Nb$_{3}$Sn thin film cavity.
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Received: 04 July 2021
Editors' Suggestion
Published: 02 September 2021
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| PACS: |
29.20.Ej
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(Linear accelerators)
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74.78.-w
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(Superconducting films and low-dimensional structures)
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74.70.-b
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(Superconducting materials other than cuprates)
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| Fund: Supported by the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2020410), the Major Research Plan of National Natural Science Foundation of China (Grant No. 91426303), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB25000000), and the National Postdoctoral Program for Innovative Talents (Grant No. BX201700257). |
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