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Gao Jie Zhai JiYuan Pan WeiMin Li ShaoPeng Sun Yi Dai JianPing Chi YunLong Li ZhongQuan Zhao TongXian Huang TongMing Ma Qiang Ge Rui Li ChunHua Guo HaiSheng Wang GuangWei Qiu Feng Lin HaiYing Hou Mi Wang QunYao 《中国科学:物理学 力学 天文学(英文版)》2011,54(2):154-159
The 1.3 GHz superconducting radio-frequency (SRF) technology is one of the key technologies for the ILC and future XFEL and ERL projects in China. With the aim to develop 1.3 GHz SRF technology, IHEP has started a program to build an SRF Accelerating Unit. This unit contains a 9-cell 1.3 GHz superconducting cavity, a short cryomodule, a high power input coupler, a tuner and a low level RF system. This program also includes the SRF laboratory upgrade, which will permit the unit to be built and tested at IHEP. The unit will be used for the 1.3 GHz SRF system integration study, high power horizontal test and possible beam test in the future. In this paper, we report the recent R&D status of this program. The first large grain low-loss shape 9-cell superconducting RF cavity made by IHEP reached 20 MV/m in the first vertical test in July, 2010. The prototype tuner and low level RF (LLRF) system are under test. The high power input coupler and cryomodule are under fabrication. Several key SRF facilities for 9-cell cavity surface treatment and pre-tuning were successfully commissioned and are in operation. 相似文献
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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 《中国科学:物理学 力学 天文学(英文版)》2011,54(2):178-181
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. 相似文献
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利用第一性原理计算方法,研究了水在金红石型TiO2(110)表面及〈001〉阶梯边缘处的吸附.关于水在(11O)表面上的吸附,研究表明,对不同的吸附率,水都是以分子模式吸附在表面.关于水在〈001〉9梯边缘处的吸附,研究表明,其吸附模式和吸附率有密切的联系.当水的吸附率为一个单层(1ML)时,分子吸附和解离吸附对应的吸附能分别为0.92和0.60eV,分子吸附模式更稳定.当吸附率降为1/2ML时,分子吸附和解离吸附所对应的吸附能分别为0.86和0.84eV,两种吸附模式都可能存在.在表面上,不同吸附模式的吸附能随吸附率变化趋势是一致的.而在〈001〉阶梯边缘处,对于不同的吸附模式,吸附能随吸附率的变化呈现出不同的变化趋势.这是由在〈001〉阶梯边缘处低吸附率时解离模式的独特结构引起的. 相似文献
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