1.3 GHz超导腔的掺氮实验

董超; 沙鹏; 刘佰奇; 李中泉; 杨际森; 王洪磊

doi:10.11884/HPLPB202032.190141

1.3 GHz超导腔的掺氮实验

doi: 10.11884/HPLPB202032.190141

董超^{1, 2, 3,},
沙鹏^{1, 2, 3, ,},
刘佰奇^{1, 2},
李中泉^{1, 2, 3},
杨际森^{1, 2, 3, 4},
王洪磊^{1, 2, 3, 4}

1.
中国科学院高能物理研究所，北京 100049
2.
中国科学院粒子加速器物理与技术重点实验室，北京 100049
3.
中国科学院高能物理研究所射频超导与低温研究中心，北京 100049
4.
中国科学院大学，北京 100049

基金项目: 科技部重点研发计划项目(2016YFA0400400)；国家自然科学基金项目(11505197)；中国科学院前沿科学重点研究计划项目(QYZDJ-SSW-SLH001)

详细信息

作者简介:
董　超(1990—)，女，博士，从事超导射频技术研究；dongchao@ihep.ac.cn

通讯作者:
沙　鹏(1982—)，男，博士，从事加速器超导高频技术研究；shapeng@ihep.ac.cn

中图分类号: TL594
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- 被引次数: 0
出版历程
- 收稿日期: 2019-05-03
- 修回日期: 2019-08-16
- 刊出日期: 2020-03-06

Nitrogen doping experiment of 1.3 GHz superconducting cavity

Dong Chao^{1, 2, 3
,},
Sha Peng^{1, 2, 3
, ,},
Liu Baiqi^{1, 2},
Li Zhongquan^{1, 2, 3},
Yang Jisen^{1, 2, 3, 4},
Wang Honglei^{1, 2, 3, 4}

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

摘要

摘要:
为了大幅度提高纯铌超导腔的品质因数，从而降低其使用功耗，选择对超导腔进行高温氮掺杂处理。立足国内外大型加速器的需求，中国科学院高能物理研究所首先开展了1.3 GHz 1-cell超导腔的研究，包括常规处理以及氮掺杂实验，并且对掺杂前后的结果进行了分析、对比。结果表明，通过掺氮，两只1.3 GHz 1-cell细晶粒纯铌超导腔的品质因数均获得了显著提升，同时在超导腔低温垂直测试中观察到了比较明显的反常的品质因数随加速梯度变化的曲线，即“anti-Q-slope”现象。
- 射频超导 /
- 掺氮 /
- 垂直测试 /
- 品质因数 /
- 加速梯度
Abstract:
In order to greatly improve the quality factor (Q) of a Nb superconducting cavity and reduce its power loss, we performed high-temperature nitrogen doping (N-doping) on the superconducting cavity, which is the most widely used method in the world. Based on the needs of large-scale accelerators at home and abroad, the Institute of High Energy Physics, Chinese Academy of Sciences, carried out researches on 1.3 GHz 1-cell superconducting cavities, including standard post-processing and N-doping. After data analysis and comparison, it can be found that the Q values of two 1.3 GHz 1-cell fine-grain superconducting cavities have been significantly improved. At the same time, the abnormal behavior of Q value depending on acceleration gradient (E_acc) was observed in low-temperature vertical test, which is called the "anti-Q-slope" phenomenon.
- superconducting radio frequency /
- nitrogen doping /
- vertical test /
- quality factor /
- accelerating gradient

HTML全文

图 1 表面处理流程

Figure 1. Procedures of surface processing

下载: 全尺寸图片幻灯片

图 2 1300S3号腔的赤道焊缝

Figure 2. Weld seam on equator of #1300S3 cavity

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图 3 安装退磁线圈

Figure 3. Assembly of degaussing coil

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图 4 两只1.3 GHz超导腔的磁通排出实验

Figure 4. Magnetic flux expulsion experiments of two 1.3 GHz cavities

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图 5 两只1.3 GHz超导腔垂直测试结果

Figure 5. Vertical test results of two 1.3 GHz cavities

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图 6 1.3 GHz超导腔的掺氮

Figure 6. N-doping of 1.3 GHz cavity

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图 7 1300S3号超导腔掺氮前后垂直测试结果比较

Figure 7. Comparison of vertical test results of #1300S3 and #1300S4 cavity before and after N-doping

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参考文献(10)

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