BEPCⅡ国产500 MHz超导腔运行综述

米正辉; 沙鹏; 孙毅; 戴建枰; 潘卫民; 王光伟; 王群要; 李中泉; 马强; 林海英; 黄彤明; 王牧源; 王洪磊

doi:10.11884/HPLPB201830.170485

BEPCⅡ国产500 MHz超导腔运行综述

doi: 10.11884/HPLPB201830.170485

米正辉^{1, 2,},
沙鹏^{1, 2, ,},
孙毅^{1, 2},
戴建枰^{1, 2},
潘卫民^{1, 2, 3},
王光伟^{1, 2},
王群要^{1, 2},
李中泉^{1, 2},
马强^{1, 2},
林海英^{1, 2},
黄彤明^{1, 2},
王牧源^{1, 2},
王洪磊^{1, 2}

1.
中国科学院高能物理研究所, 北京 100049
2.
中国科学院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:

北京正负电子对撞机二期项目 Y41G1020Y1

科技部先导专项项目 Y61624206A

详细信息

作者简介:
米正辉(1986-), 男, 博士, 从事超导高频系统研究; 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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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-01
- 修回日期: 2018-05-04
- 刊出日期: 2018-08-15

Operation of domestic 500 MHz superconducting cavity for BEPC Ⅱ

Mi Zhenghui^{1, 2
,},
Sha Peng^{1, 2
, ,},
Sun Yi^{1, 2},
Dai Jianping^{1, 2},
Pan Weimin^{1, 2, 3},
Wang Guangwei^{1, 2},
Wang Qunyao^{1, 2},
Li Zhongquan^{1, 2},
Ma Qiang^{1, 2},
Lin Haiying^{1, 2},
Huang Tongming^{1, 2},
Wang Muyuan^{1, 2},
Wang Honglei^{1, 2}

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

摘要

摘要: 北京正负电子对撞机二期(BEPCⅡ)，国产500 MHz超导腔经过紧张的安装调试于2017年10月正式投入带束流运行。首先对此国产超导腔两次降温调试的相关参数进行了监测和对比分析；其次研究了通过高功率老练的方法改善超导腔的品质因数，并实时监测超导腔老练过程中的辐射剂量；最后对超导腔的带束流运行情况进行了介绍分析。结果表明：BEPCⅡ国产500 MHz超导腔虽然放置了6年，但是状态良好，通过高功率老练能够降低超导腔的辐射剂量，改善其性能，完全满足束流运行要求。
- 射频超导 /
- 储存环 /
- 束流实验 /
- 辐射剂量监测
Abstract: The domestic 500 MHz superconducting cavity for BEPC Ⅱ has been installed and beam tested in October 2017.The related parameters of cavity during cooling down have been monitored and analyzed, the quality factor of the cavity has been improved by high RF (radio frequency) power aging, and the radiation dose has been monitored, and the situation of cavity running with beam has been analyzed.The results show that the cavity has been working very well though it had been idle for six years, and the performance of the cavity has been improved through high RF power aging.The performance of the cavity completely meets the demands of beam running.
- RF superconducting /
- storage ring /
- beam experiment /
- radiation monitoring

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图 1 BEPCⅡ 500 MHz超导模组结构及BEPCⅡ 500 MHz裸腔

Figure 1. Structure of BEPC'sⅡ 500 MHz superconducting cryomodule and BEPC'sⅡ 500 MHz bare cavity

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图 2 耦合器老练情况

Figure 2. Status of coupler aging

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图 3 超导腔降温情况

Figure 3. Status of SRF cavity cool down

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图 4 频率调谐系统

Figure 4. Frequency tuning system

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图 5 超导腔Q₀及辐射剂量变化

Figure 5. Q₀ and radiation dose change

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图 6 北京正负电子对撞机(BEPCⅡ)实时运行状态

Figure 6. BEPCⅡ real time status

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图 7 (a) 辐射剂量率和随流强随时间变化；(b)调谐器工作状态曲线

Figure 7. (a)Radiation dose rate and beam change with time; (b) operation data of tuner

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表 1 BEPCⅡ 500 MHz超导腔主要设计参数

Table 1. Main design parameters of BEPC'sⅡ 500 MHz superconducting cavity

	cavity voltage/MV	Q₀(unloaded quality factor)	frequency /MHz	Q_L(loaded quality factor)	coupler power (total reflection/kW)	HOM power/kW
designed	1.5~2.0	>5.0×10⁸	499.8±0.05	1.7×10⁵(1±10%)	50	>4
measured	2.17	7.67×10⁸	499.8	1.33×10⁵	100	9

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参考文献(8)

[1]	Mi Zhenghui, Sun Yi, Wang Guangwei, et al. Horizontal test for BEPCⅡ 500 MHz spare cavity[J]. Chin Phys C, 2012, 36(10): 996-999 doi: 10.1088/1674-1137/36/10/014
[2]	王光伟, 沙鹏, 潘卫民, 等. BEPCⅡ高频系统的建造[J]. Chin Phys C, 2008, 32(1): 169-171. https://www.cnki.com.cn/Article/CJFDTOTAL-KNWL2008S1058.htm Wang Guangwei, Sha Peng, Pan Weimin, et al. The construction of BEPCⅡ SRF system. Chin Phys C, 2008, 32(1): 169-171 https://www.cnki.com.cn/Article/CJFDTOTAL-KNWL2008S1058.htm
[3]	Liu Yaping, Wang Guangwei, Pan Weimin, et al. R&D of BEPCⅡ 500 MHz superconducting cavity[J]. Science China Physics, Mechanics & Astronomy, 2010, 54(2): s178-s181.
[4]	Huang Tongming, Lin Haiying, Sun Yi, et al. Some experiences with BEPCⅡ SRF system operation[J]. Chin Phys C, 2016, 40: 067001. doi: 10.1088/1674-1137/40/6/067001
[5]	Huang Tongming, Pan Weimin, Ma Qiang, et al. High power input coupler for BEPCⅡ 500 MHz superconducting cavity[J]. Nuclear Instruments and Methods in Physics Research, 2010, A(623): 895-902.
[6]	Mi Zhenghui, Sun Yi, Pan Weimin, et al. A tuning system for BEPCⅡ[J]. Chin Phys C, 2013, 37: 087003. doi: 10.1088/1674-1137/37/8/087003
[7]	Mi Zhenghui, Zhao Danyang, Sun Yi, et al. Design and test of frequency tuner for CAEP high power THz free-electron laser[J]. Chin Phys C, 2015, 39(2): 95-100. http://www.xueshufan.com/publication/2952339366
[8]	Luo Xing, Lao Chenglong, Zhou Kui, et al. Design and fabrication of the 2×4-cell superconducting linac module for the free-electron laser[J]. Nuclear Instruments and Methods in Physics Research, 2017, A(871): 30-34.