The Measurement Principle of RF Superconducting Nb Cavity

Zu Donglin; Chen Jiaer

Chinese Physics C> 1996, Vol. 20> Issue(7) : 663-672

The Measurement Principle of RF Superconducting Nb Cavity

Zu Donglin ^, ,
Chen Jiaer

Institute of Heavy Ion Physics, Peking Unviversity, Beijing 100871

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Abstract：
This paper describes the measurement principle and methods of RF superconducting Nb cavity according to the energy conservation. It suggests that there are differences in measuring methods between high power and low power cavities due to electron field emission(FE) existing in superconducting Nb cavities. A set of exact formulae and equations on physics parameters of superconducting Nb cavities has been systematically derived, such as quality factor Q₀ without loads, the maximum of the surface electrical field intensity Esp, the maximum of the accelerating gradient Eacc, etc.

References

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John C Slater,Microwave Electronics,p44（1950）.[2]俎栋林，超导铌腔低温实验中的射频控制，北大重离子所内部报告，IHIP/91021991.10.[3]A.F.Harvey,Microwave Engineering,p204.[4]Chen Chia-erh et al.,“Superconducting RF Activitiesat Peking University”PAC,San Fracisco,1991.[5]杨祥林等，微波器件原理，电子工业出版社，第28页，1985.[6]张肃文，高频电子线路，下册第一分册第92页，1992.[7]T.Weiland,DESY 82-015 and DESYM-82-24,Germany.[8]U.Laustroer,U.vanRienen, T.Weilnad,DESYM-87-03（February1987）,Germany.[9]K.Halbach,R.F.Holsinger,Part.Acc.,7（1976）213.[10]S.Ramo,J.R.Whinnerry,T.Van Duzer,Fielded Waves in Comuncation Electronics,p567（1957）.[11]Q.S.Shu et al.,Reducing Field Emission in Supercoducting RF Cavities for the Next Generation of Particle Accerators, CLNS 90/1020.

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Zu Donglin and Chen Jiaer. The Measurement Principle of RF Superconducting Nb Cavity[J]. Chinese Physics C, 1996, 20(7): 663-672.

Zu Donglin and Chen Jiaer. The Measurement Principle of RF Superconducting Nb Cavity[J]. Chinese Physics C, 1996, 20(7): 663-672. shu

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Received: 1900-01-01
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

The Measurement Principle of RF Superconducting Nb Cavity

Zu Donglin ^,
Chen Jiaer

Corresponding author: Zu Donglin,

Institute of Heavy Ion Physics, Peking Unviversity, Beijing 100871

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1996-07-05

Abstract: This paper describes the measurement principle and methods of RF superconducting Nb cavity according to the energy conservation. It suggests that there are differences in measuring methods between high power and low power cavities due to electron field emission(FE) existing in superconducting Nb cavities. A set of exact formulae and equations on physics parameters of superconducting Nb cavities has been systematically derived, such as quality factor Q₀ without loads, the maximum of the surface electrical field intensity Esp, the maximum of the accelerating gradient Eacc, etc.