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

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

doi:10.1088/1674-1137/39/4/047001

Chinese Physics C> 2015, Vol. 39> Issue(4) : 047001 DOI: 10.1088/1674-1137/39/4/047001

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

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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.

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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 and LIU Jian-Fei. Studies of an LL-type 500 MHz 5-cell superconducting cavity at SINAP[J]. Chinese Physics C, 2015, 39(4): 047001. doi: 10.1088/1674-1137/39/4/047001

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Received: 2014-07-04
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Corresponding author: LIU Jian-Fei,

Received Date: 2014-07-04

Accepted Date: 1900-01-01

Available Online: 2015-04-05

Abstract: 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.

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

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通讯作者: 陈斌, bchen63@163.com

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

Corresponding author: LIU Jian-Fei,

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