R&D of BEPCII 500 MHz superconducting cavity |
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Authors: | Liu YaPing Wang GuangWei Pan WeiMin Li JiZhen Liu DeGui Sun Yi Li ZhongQuan Dai JianPing Li ShaoPeng He Kun Wang GuoPing Zhao GuangYuan Ma Qiang Lin HaiYing Sha Peng Wang QunYao Qiu Feng Meng FanBo Li Han |
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Affiliation: | 1.Institute of High Energy Physics,Chinese Academy of Sciences,Beijing,China;2.AVIC Beijing Aeronautical Manufacturing Technology Research Institute,Beijing,China;3.Graduate University of Chinese Academy of Sciences,Beijing,China |
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Abstract: | Beijing Electron-Positron Collider Upgrade (BEPCII) adopts two 500 MHz superconducting cavities (SCCs) in each ring for higher accelerated gradient, higher Q and lower impedance (Wang et al. The proceedings of SRF’07). There’s no spare cavity due to the limited time and funding during BEPCII construction. If any serious trouble happened on either one of the two cavities and could not be recovered in a short time, the operation of BEPCII facility will be affected. Therefore, since 2009 three spare cavities have been fabricated in China to ensure reliable operation, and two of them have been successfully vertically tested in January and July 2011. This paper will briefly present the manufacture, post-process and vertical test performance of the 500 MHz spare cavities. |
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