Studies of an LL-type 500 MHz 5-cell superconducting cavity at SINAP

A low loss- （LL） type 500 MHz 5-cell superconducting niobium prototype cavity with a large beam aperture has been developed successfully including the optimization, the deep drawing and electron beam welding, the surface treatment and the vertical testing. The performance of the fundamental mode was...

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Bibliographic Details
Published inChinese physics C Vol. 39; no. 4; pp. 67 - 72
Main Author 侯洪涛 马震宇 毛冬青 封自强 罗琛 是晶 王岩 李正 徐凯 赵玉彬 郑湘 赵申杰 张志刚 刘建飞
Format Journal Article
LanguageEnglish
Published 01.04.2015
Subjects
500型
Apertures
Chemical polishing
Deep drawing
Electric potential
Expansion
Field emission
Holes
Superconductivity
传播衰减
机械抛光
测试过程
电子束焊接
细胞
表面处理
超导腔
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Summary:A low loss- （LL） type 500 MHz 5-cell superconducting niobium prototype cavity with a large beam aperture has been developed successfully including the optimization, the deep drawing and electron beam welding, the surface treatment and the vertical testing. The performance of the fundamental mode was optimized and the higher order modes were damped by adopting an enlarged beam pipe for propagation. Surface preparation or treatment including mechanical polishing, buffered chemical polishing and high pressure rinsing with ultra-pure water and so on was carried out carefully to ensure a perfect inner surface condition. The vertical testing results show that the accelerating voltage higher than 7.5 MV was obtained while the quality factor was better than 1× 109 at 4.2 K. No obvious multipacting or field emission was found during the test. However, a quench happened while increasing the field a little higher than 7.5 MV that at present limited the cavity performance.
Bibliography:HOU Hong-Tao MA Zhen-Yu MAO Dong-Qing FENG Zi-Qiang LUO Chen SHI Jing WANG Yan LI Zheng XU Kai ZHAO Yu-Bin ZHENG Xiang ZHAO Shen-Jie（ ZHANG Zhi-Gang LIU Jian-Fei （1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China 2 University of Chinese Academy of Sciences, Beijing 100049, China 3 Shanghai Key Laboratory of Cryogenics ＆ Superconducting RF Technology, Shanghai 201800, China）
11-5641/O4
A low loss- （LL） type 500 MHz 5-cell superconducting niobium prototype cavity with a large beam aperture has been developed successfully including the optimization, the deep drawing and electron beam welding, the surface treatment and the vertical testing. The performance of the fundamental mode was optimized and the higher order modes were damped by adopting an enlarged beam pipe for propagation. Surface preparation or treatment including mechanical polishing, buffered chemical polishing and high pressure rinsing with ultra-pure water and so on was carried out carefully to ensure a perfect inner surface condition. The vertical testing results show that the accelerating voltage higher than 7.5 MV was obtained while the quality factor was better than 1× 109 at 4.2 K. No obvious multipacting or field emission was found during the test. However, a quench happened while increasing the field a little higher than 7.5 MV that at present limited the cavity performance.
superconducting niobium cavity, low loss, multicell, fabrication, optimization, vertical test
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/39/4/047001