Study on the Performance of the Input Coupler for the BEPCⅡ Superconducting RF Cavity

ZHONG Juan; PAN Wei-Min

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《中国物理C》（英文）编辑部

2024年10月30日

Chinese Physics C> 2006, Vol. 30> Issue(10) : 1014-1017

Study on the Performance of the Input Coupler for the BEPCⅡ Superconducting RF Cavity

ZHONG Juan ^, ,
PAN Wei-Min

Institute of High Energy Physics, CAS, Beijing 100049, China

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Abstract：
The input coupler for the accelerator cavity is one of the most critical parts in the RF accelerating system, its performance directly influences the RF power coupling to cavity, therefore, directly influences the cavity's quality. In the RF system of the BEPCⅡ, an antenna coaxial input coupler based on the design of KEKB superconducting (SC) cavity's coupler will be used. It's first to use this kind of high power coupler under the frequency of 500MHz in China. Some studies on this RF coupler have been done, which includes the multi-pacting (MP) effect, the transmission performance and the thermal layout simulation. The results show that (1) there are several serious MP points exist in this kind of coupler and some necessary ways must be taken to protect the coupler from destroying; (2) the transmission performance under BEPCⅡ operation frequency can be improved by optimizing the configuration of the coupler; (3) the heat-distributing pattern of the coupler from the simulation provides the important information for the cooling system design.

[1]	JI Bin , ZHAO Zhen-Lu , ZHANG Tian-Jue , XING Jian-Sheng , WANG Xiu-Long , YIN Zhi-Guo , HOU Shi-Gang , XIA Le . Theoretical and Practical Study on RF Model Cavity of 100MeV H^－ Cyclotron. Chinese Physics C, 2008, 32(S1): 160-162.
[2]	SUN Yi , WANG Guang-Wei , PAN Wei-Min , LI Zhong-Quan , HUANG Hong , MA Qiang , LIN Hai-Ying , XU Bo , WANG Qun-Yao , LI Shao-Peng , HE Kun , LIU Ya-Ping . First Superconducting RF System Commissioning for BEPCⅡ in China. Chinese Physics C, 2008, 32(S1): 191-193.
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[4]	WANG Guang-Wei , SHA Peng , PAN Wei-Min , SUN Yi , LI Zhong-Quan , LIU Rong , HUANG Tong-Ming , ZENG Ri-Hua , ZHAO Guang-Yuan , HUANG Hong , XU Yu-Fen , MA Qiang , LIN Hai-Ying , XU Bo , WANG Qun-Yao . Construction of the BEPCⅡ RF System. Chinese Physics C, 2008, 32(S1): 169-171.
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ZHONG Juan and PAN Wei-Min. Study on the Performance of the Input Coupler for the BEPCⅡ Superconducting RF Cavity[J]. Chinese Physics C, 2006, 30(10): 1014-1017.

ZHONG Juan and PAN Wei-Min. Study on the Performance of the Input Coupler for the BEPCⅡ Superconducting RF Cavity[J]. Chinese Physics C, 2006, 30(10): 1014-1017. shu

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Received: 2006-01-09
Revised: 2006-02-17

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on the Performance of the Input Coupler for the BEPCⅡ Superconducting RF Cavity

ZHONG Juan ^,
PAN Wei-Min

Corresponding author: ZHONG Juan,

Institute of High Energy Physics, CAS, Beijing 100049, China

Received Date: 2006-01-09
Accepted Date: 2006-02-17
Available Online: 2006-10-05

Abstract: The input coupler for the accelerator cavity is one of the most critical parts in the RF accelerating system, its performance directly influences the RF power coupling to cavity, therefore, directly influences the cavity's quality. In the RF system of the BEPCⅡ, an antenna coaxial input coupler based on the design of KEKB superconducting (SC) cavity's coupler will be used. It's first to use this kind of high power coupler under the frequency of 500MHz in China. Some studies on this RF coupler have been done, which includes the multi-pacting (MP) effect, the transmission performance and the thermal layout simulation. The results show that (1) there are several serious MP points exist in this kind of coupler and some necessary ways must be taken to protect the coupler from destroying; (2) the transmission performance under BEPCⅡ operation frequency can be improved by optimizing the configuration of the coupler; (3) the heat-distributing pattern of the coupler from the simulation provides the important information for the cooling system design.