HOMs simulation and measurement results of IHEP02 cavity

ZHENG Hong-Juan; ZHAI Ji-Yuan; ZHAO Tong-Xian; GAO Jie

doi:10.1088/1674-1137/39/11/117006

Chinese Physics C> 2015, Vol. 39> Issue(11) : 117006 DOI: 10.1088/1674-1137/39/11/117006

HOMs simulation and measurement results of IHEP02 cavity

1.
Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
In accelerator RF cavities, there exists not only the fundamental mode which is used to accelerate the beam, but also higher order modes (HOMs). The higher order modes excited by the beam can seriously affect beam quality, especially for the higher R/Q modes. 1.3 GHz low-loss 9-cell superconducting cavity as a candidate for ILC high gradient cavity, the properties of higher order mode has not been studied carefully. IHEP based on existing low loss cavity, designed and developed a large grain size 1.3 GHz low-loss 9-cell superconducting cavity (IHEP02 cavity). The higher order mode coupler of IHEP02 used TESLA coupler's design. As a result of the limitation of the mechanical design, the distance between higher order mode coupler and end cell is larger than TESLA cavity. This paper reports on measured results of higher order modes in the IHEP02 1.3 GHz low-loss 9-cell superconducting cavity. Using different methods, Q_e of the dangerous modes passbands have been obtained. The results are compared with TESLA cavity results. R/Q of the first three passbands have also been obtained by simulation and compared with the results of the TESLA cavity.
- 1.3 GHz 9-cell superconducting cavity ,
- low-loss shape ,
- higher order modes ,
- Qe ,
- experimental measurements

References

[1]	ZHAI Ji-Yuan, ZHAO Tong-Xian, Li Zhong-Quan et al. IHEP 1.3 GHz Low Loss Large Grain 9- cell Cavity Fabrication, Processing and Test. Proceedings of the 16th Workshop on RF Superconductivity. France, 2013. 305
[2]	Edwards D A. TESLA Test Facility Linac Design Report, Version1.0, 1 March 1995. Dt. Elektronen-Synchrotron DESY, MHF-SL Group, 1995
[3]	Wangler T P. RF Linear Accelerators 2nd Completely Revised and Enlarged Edition. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, 2008. 168-170; 361-397
[4]	Jacek Sekutowicz. Higher Order Mode Coupler for TESLA. Proceedings of the 6th Workshop on RF Superconductivity, USA, 1994. 426
[5]	Monopole W R. Dipole and Quadrupole Passbands of the TESLA 9- cell Cavity. DESY-TESLA 2001-33, 2011. 34
[6]	ZHAO Tong-Xian. Researches on Accelerator Unit for Linear Collider (Ph. D. Thesis). Beijing: Institute of High Energy Physics, CAS, 2010 (in Chinese)
[7]	ZHANG Zhao-Tang. Measurement of Microwave system. Beijing: National Defence Industry Press, 1982. 10-19; 123-127 (in Chinese)
[8]	Altman J L. Microwave Circuits. New York: D. Van Nostrand Company, Inc., 1964. 219
[9]	Watanabe K. Studies on the Higher Order Mode of a 9cell Superconducting Cavity (Ph. D. Thesis). Tsukuba: GUAS/AS, 2007 (in Japanese)
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ZHENG Hong-Juan, ZHAI Ji-Yuan, ZHAO Tong-Xian and GAO Jie. HOMs simulation and measurement results of IHEP02 cavity[J]. Chinese Physics C, 2015, 39(11): 117006. doi: 10.1088/1674-1137/39/11/117006

ZHENG Hong-Juan, ZHAI Ji-Yuan, ZHAO Tong-Xian and GAO Jie. HOMs simulation and measurement results of IHEP02 cavity[J]. Chinese Physics C, 2015, 39(11): 117006. doi: 10.1088/1674-1137/39/11/117006 shu

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Received: 2015-02-04
Revised: 2015-07-07

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Supported by Knowledge Innovation Project of The Chinese Academy of Sciences

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

HOMs simulation and measurement results of IHEP02 cavity

Corresponding author: ZHENG Hong-Juan,

1. Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2015-02-04
Accepted Date: 2015-07-07
Available Online: 2015-11-20

Fund Project: Supported by Knowledge Innovation Project of The Chinese Academy of Sciences

Abstract: In accelerator RF cavities, there exists not only the fundamental mode which is used to accelerate the beam, but also higher order modes (HOMs). The higher order modes excited by the beam can seriously affect beam quality, especially for the higher R/Q modes. 1.3 GHz low-loss 9-cell superconducting cavity as a candidate for ILC high gradient cavity, the properties of higher order mode has not been studied carefully. IHEP based on existing low loss cavity, designed and developed a large grain size 1.3 GHz low-loss 9-cell superconducting cavity (IHEP02 cavity). The higher order mode coupler of IHEP02 used TESLA coupler's design. As a result of the limitation of the mechanical design, the distance between higher order mode coupler and end cell is larger than TESLA cavity. This paper reports on measured results of higher order modes in the IHEP02 1.3 GHz low-loss 9-cell superconducting cavity. Using different methods, Q_e of the dangerous modes passbands have been obtained. The results are compared with TESLA cavity results. R/Q of the first three passbands have also been obtained by simulation and compared with the results of the TESLA cavity.