Measurements of Static Heat Loss and Unloaded Q<SUB>0</SUB> on the BEPCⅡ SRF Cavities

BIAN Lin; LI Shao-Peng; LIU Ya-Ping

Chinese Physics C> 2008, Vol. 32> Issue(S1) : 166-168

Measurements of Static Heat Loss and Unloaded Q₀ on the BEPCⅡ SRF Cavities

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Abstract：
The static heat loss and unloaded Q₀ are the most important values for both the cryogenic and the RF systems. The BEPCⅡ SRF cavity operates in a liquid helium bath contained in a vacuum insulated, liquid nitrogen cooled radiation shielded vessel. During the horizontal test at the test station, thermodynamic method is used to measure and calculate the static loss and Q₀ value of the SRF cavity. This paper has briefly introduced the method and process to measure the static loss and Q₀ value of the SRF cavity. The results under different experimental conditions are presented as important data for acceptance test of the SRF cavity.

References

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. Engineering Design Report on BEPC-II Cryogenic System. Institute of Cryogenic and Superconductivity Technology.Harbin Institute of Technology, 2005.82. Software Product: HEPAK. Version 3.40. Horizon Technologies. 25-JANUARY-20073. ZHENG De-Qing, YUAN Xiu-Ling. The Chart of Ther-mophysical Properties of Fluids. Beijing: Mechanical and Industrial Publication, 1982(in Chinese)(郑德馨, 袁秀玲. 低温工质热物理性质表和图. 北京: 机械工业出版社, 1982)4. LIU Ya-Ping. Collation Table of Liquide Helium Level and Volume for BEPCII Superconducting Cavity. Internal Report of Cryogenic Group, Institute of High Energy Physics,CAS, China, 2006.6(in Chinese)(刘亚萍. BEPC且超导腔氮池液位一体积对应表.中国科学院高能物理研究所加速器中心低温组, 2006.6)5. Hasan Padamsee, Jens Knobloch, Tom Hays. RF Supercon-ductivity for Accelerators. Cornell University, Ithaca, New York. 1998

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BIAN Lin, LI Shao-Peng and LIU Ya-Ping. Measurements of Static Heat Loss and Unloaded Q₀ on the BEPCⅡ SRF Cavities[J]. Chinese Physics C, 2008, 32(S1): 166-168.

BIAN Lin, LI Shao-Peng and LIU Ya-Ping. Measurements of Static Heat Loss and Unloaded Q₀ on the BEPCⅡ SRF Cavities[J]. Chinese Physics C, 2008, 32(S1): 166-168. shu

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Received: 2008-01-10
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Measurements of Static Heat Loss and Unloaded Q₀ on the BEPCⅡ SRF Cavities

Corresponding author: BIAN Lin,

Received Date: 2008-01-10
Accepted Date: 1900-01-01
Available Online: 2008-01-04

Abstract: The static heat loss and unloaded Q₀ are the most important values for both the cryogenic and the RF systems. The BEPCⅡ SRF cavity operates in a liquid helium bath contained in a vacuum insulated, liquid nitrogen cooled radiation shielded vessel. During the horizontal test at the test station, thermodynamic method is used to measure and calculate the static loss and Q₀ value of the SRF cavity. This paper has briefly introduced the method and process to measure the static loss and Q₀ value of the SRF cavity. The results under different experimental conditions are presented as important data for acceptance test of the SRF cavity.