Studies on Higher Order Modes in BEPCⅡ Superconducting Cavity

PAN Wei-Min; SUN Yi; WANG Guang-Wei; Takaaki Furuya; ichi Kurokawa

Chinese Physics C> 2004, Vol. 28> Issue(3) : 317-320

Studies on Higher Order Modes in BEPCⅡ Superconducting Cavity

Institute of High Energy Physics,CAS,Beijing 100039,China2 High Energy Accelerator Research Organization KEK,1-1 Oho,Tsukuba-shi,Ibaraki-ken,305-0801,Japan

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Abstract：
To investigate the higher order mode (HOM) damping in the BEPCⅡ superconducting cavity (SC) when using HOM absorbers, simulations have been done for changing the position and the length as well as the thickness of ferrite of HOM damper, and for different positions and angles of taper. The optimized values under which the HOM impedance of the BEPCⅡ SC cavity will be trapped in the impedance threshold of the BEPCⅡ collider have been found. For verifying the simulation result mentioned above, HOM measurements on the BEPCⅡ model cavity have been made, and the satisfied results for HOM damping are obtained. The distribution and magnitude of some potentially dangerous higher order modes have been found, which are basically consistent with the simulations.

References

[1]

. Takaaki Furuya. Superconducting Cavity, Physics and Engineering of High Performance Electron Storage Rings and Application of Supercon-duct ing Technology. Proceedings of the Asian Accelerat or School, 19992. Impedance and Collective Effects, BEPCⅡDesign report, IHEP..AC-Report/2002- 01, May 20023. CLANS Manual,Private Communication

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[14]	LIN Zhi-Gang , ZHOU Lin , CHEN Huai-Bi , ZHAO Zhen-Tang . Suppression of HOM's on a Prototype Superconducting Cavity by Absorbers. Chinese Physics C, 2003, 27(8): 735-738.
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[18]	Zhou Feng . Study of BEPC Impedance. Chinese Physics C, 1998, 22(8): 739-744.
[19]	Zu Donglin , Chen jiaer . Study on SRF Multicell Accelerating Cavity for Linear Collider and Trapped Modes. Chinese Physics C, 1997, 21(2): 180-186.
[20]	PEI Guo-Xi , XIE Jia-Lin , ZHOU Shu , SUN Song-Lan . OPTIMIZATION OF BEPC POSITRON SOURCE. Chinese Physics C, 1990, 14(2): 110-117.

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PAN Wei-Min, SUN Yi, WANG Guang-Wei, Takaaki Furuya and ichi Kurokawa. Studies on Higher Order Modes in BEPCⅡ Superconducting Cavity[J]. Chinese Physics C, 2004, 28(3): 317-320.

PAN Wei-Min, SUN Yi, WANG Guang-Wei, Takaaki Furuya and ichi Kurokawa. Studies on Higher Order Modes in BEPCⅡ Superconducting Cavity[J]. Chinese Physics C, 2004, 28(3): 317-320. shu

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Received: 2003-08-11
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

Studies on Higher Order Modes in BEPCⅡ Superconducting Cavity

Corresponding author: PAN Wei-Min,

Institute of High Energy Physics,CAS,Beijing 100039,China2 High Energy Accelerator Research Organization KEK,1-1 Oho,Tsukuba-shi,Ibaraki-ken,305-0801,Japan

Received Date: 2003-08-11
Accepted Date: 1900-01-01
Available Online: 2004-03-05

Abstract: To investigate the higher order mode (HOM) damping in the BEPCⅡ superconducting cavity (SC) when using HOM absorbers, simulations have been done for changing the position and the length as well as the thickness of ferrite of HOM damper, and for different positions and angles of taper. The optimized values under which the HOM impedance of the BEPCⅡ SC cavity will be trapped in the impedance threshold of the BEPCⅡ collider have been found. For verifying the simulation result mentioned above, HOM measurements on the BEPCⅡ model cavity have been made, and the satisfied results for HOM damping are obtained. The distribution and magnitude of some potentially dangerous higher order modes have been found, which are basically consistent with the simulations.