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]	BI Yuan-Jie,ZHANG Tian-Jue,JI Bin,YAO Hong-Juan,AN Shi-Zhong,XING Jian-Sheng,TANG Chuan-Xiang. Research on RF Cavity Tolerance of CYCIAE-100. Chinese Physics C, 2008, 32(S1): 163-165.
[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.
[3]	BIAN Lin,LI Shao-Peng,LIU Ya-Ping. Measurements of Static Heat Loss and Unloaded Q₀on the BEPCⅡ SRF Cavities. Chinese Physics C, 2008, 32(S1): 166-168.
[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.
[5]	PAN Wei-Min,WANG Guang-Wei,. Calculation of the External Quality Factor of the High Power Input Coupler for the BEPCII Superconducting Cavity. Chinese Physics C, 2008, 32(1): 72-74.doi:10.1088/1674-1137/32/1/016
[6]	SUN Yi-Peng,GAO Jie. Some Studies on Increasing the Luminosity of BEPCⅡ. Chinese Physics C, 2007, 31(2): 189-193.
[7]	WANG Shu-Hong,PEI Guo-Xi,LIU Wei-Bin,CHEN Yan-Wei,YE Qiang,GENG Zhe-Qiao. Studies on the Beam Orbit and Energy Instabilities at the BEPCⅡ Linac. Chinese Physics C, 2007, 31(11): 1067-1070.
[8]	ZHAO Feng-Li,HOU Mi,ZHAO Yan-Ping,LIU Jin-Tong,ZHANG Jing-Ru,ZHOU Yao-Xiang,HAN Da-Wei. Microwave System for BEPCⅡ-Linac. Chinese Physics C, 2006, 30(2): 155-158.
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[15]	PAN Wei-Min,SUN Yi,WANG Guang-Wei,Takaaki Furuya,ichi Kurokawa. Studies on Higher Order Modes in BEPCⅡ Superconducting Cavity. Chinese Physics C, 2004, 28(3): 317-320.
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[20]	FANG Shou-Xian,CHEN Li-Min,CHEN Sen-Yu,CHEN Si-Yu,LIANG Xiu-Ru,ZHANG Chuang. IMPROVMENTS TO THE BEPC STORAGE RING LATTICE. Chinese Physics C, 1986, 10(2): 207-214.

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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.