1.3 GHz超导腔磁通排出效应研究

米正辉; 杨际森; 沙鹏; 董超; 王洪磊; 翟纪元; 林海英; 郑洪娟; 刘佰奇; 孙良瑞; 张祥镇; 贺斐思; 潘卫民

doi:10.11884/HPLPB202032.190398

1.3 GHz超导腔磁通排出效应研究

doi: 10.11884/HPLPB202032.190398

米正辉^{1, 2,},
杨际森^{1, 2},
沙鹏^{1, 2, ,},
董超^{1, 2},
王洪磊^{1, 2},
翟纪元^{1, 2},
林海英^{1, 2},
郑洪娟^{1, 2},
刘佰奇^{1, 2},
孙良瑞^{1, 2},
张祥镇^{1, 2},
贺斐思^{1, 2},
潘卫民^{1, 2, 3}

1.
中国科学院高能物理研究所，北京 100049
2.
中国科学院高能物理研究所，粒子加速器物理与技术重点实验室，北京 100049
3.
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（11805216）

详细信息

作者简介:
米正辉（1986—），男，博士，从事射频超导技术及高频系统研究；mizh@ihep.ac.cn

通讯作者:
沙　鹏（1982—），男，博士，从事射频超导腔技术研究；shapeng@ihep.ac.cn

中图分类号: TL594
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出版历程
- 收稿日期: 2019-10-09
- 修回日期: 2019-12-21
- 刊出日期: 2020-05-12

Magnetic flux expulsion effect of 1.3 GHz superconducting cavity

Mi Zhenghui^{1, 2
,},
Yang Jisen^{1, 2},
Sha Peng^{1, 2
, ,},
Dong Chao^{1, 2},
Wang Honglei^{1, 2},
Zhai Jiyuan^{1, 2},
Lin Haiying^{1, 2},
Zheng Hongjuan^{1, 2},
Liu Baiqi^{1, 2},
Sun Liangrui^{1, 2},
Zhang Xiangzhen^{1, 2},
He Feisi^{1, 2},
Pan Weimin^{1, 2, 3}

1.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 设计并搭建了一套高精度的磁场测量和补偿系统，并结合中国科学院高能物理研究所（IHEP）的2K超导腔垂直测试平台对1.3 GHz 单加速间隙超导腔的磁通排出效应开展了实验研究：利用研制的磁场测量和补偿系统能够精密地测量超导腔赤道位置磁场，并能够将磁场补偿至小于5.0×10⁻⁸ T；并对超导腔不同表面温度梯度下的磁通排出效应进行了测量分析；对钉扎了磁场的超导腔进行了射频性能测试，研究了超导腔电阻对磁通钉扎的敏感度，以及在不同电场梯度下超导腔的表面电阻变化情况。结果表明，研制的高精度磁场测量和补偿系统能够满足超导腔磁通排出研究的需求；高的超导腔表面温度梯度有利于磁通的排出；磁通钉扎电阻的敏感度随着加速电场梯度的增加而增大，导致超导腔的性能下降。此实验研究也为后续超导腔的研制奠定了一定基础。
- 超导铌腔 /
- 磁通排出 /
- 表面电阻 /
- 射频超导 /
- 亥姆霍兹线圈
Abstract: The research of magnetic flux expulsion of 1.3 GHz single-cell superconducting cavity has been carried out with a new set of high precision magnetic measuring and compensating system, combining with 2 K vertical test system of IHEP. The magnetic field at the equator of cavity can be measured with the system and compensated to less than 5.0×10⁻⁸ T. The magnetic flux expulsion effect of superconducting cavity under different surface temperature gradient is measured and analyzed. The rf performance of the cavity pinned with magnetic flux is tested, and the sensitivity of superconducting cavity resistance to magnetic flux pinning and the surface resistance of superconducting cavity under different electric field gradients are studied accordingly. The results show that the developed high precision magnetic field measuring and compensating system can meet the research needs of magnetic flux expulsion of superconducting cavity. Higher surface temperature gradient of superconducting cavity is beneficial to the magnetic flux expulsion. The sensitivity of flux pinning resistance increases with the increase of electric field. The research has also laid a foundation for the development of superconducting cavity.
- superconducting niobium cavity /
- magnetic flux expulsion /
- surface resistance /
- radio frequency superconductivity /
- Helmholtz coil

HTML全文

图 1 迈斯纳效应和非完全迈斯纳效应

Figure 1. Meissner effect and incomplete Meissner effect

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图 2 测量1.3 GHz 单加速间隙超导腔磁通排出的原理及实物装置

Figure 2. Scheme and apparatus for measuring magnetic flux expulsion in a 1.3 GHz single cell SRF cavity

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图 3 1.3 GHz单加速间隙超导腔磁通排出情况

Figure 3. Magnetic flux expulsion of 1.3 GHz single cell cavity

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图 4 超导腔表面电阻及最大电场梯度测试结果

Figure 4. Surface resistance and maximum E_acc test results

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图 5 不同温度下超导腔表面电阻随加速电场变化情况

Figure 5. Surface resistance vs accelerating electric field at different temperature

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图 6 超导腔磁通排出情况及俘获磁通敏感度随加速梯度变化

Figure 6. Magnetic flux expulsion and trapped flux sensitivity at different accelerating field

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参考文献(10)

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