Measurement of the transfer function for a spoke cavity of C-ADS Injector I

Xue-Fang Huang; Yi Sun; Guang-Wei Wang; Shao-Zhe Wang; Xiang Zheng; Qun-Yao Wang; Rong Liu; Hai-Ying Lin; Mu-Yuan Wang

doi:10.1088/1674-1137/41/4/047001

Chinese Physics C> 2017, Vol. 41> Issue(4) : 047001 DOI: 10.1088/1674-1137/41/4/047001

Measurement of the transfer function for a spoke cavity of C-ADS Injector I

1.
University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract：
The spoke cavities mounted in the China Accelerator Driven sub-critical System (C-ADS) have high quality factor (Q) and very small bandwidth, making them very sensitive to mechanical perturbations, whether external or self-induced. The transfer function is used to characterize the response of the cavity eigenfrequency to the perturbations. This paper describes a method to measure the transfer function of a spoke cavity. The measured Lorentz transfer function shows there are 206 Hz and 311 Hz mechanical eigenmodes excited by Lorentz force in the cavity of C-ADS, and the measured piezo fast tuner transfer function shows there are 12 mechanical eigenmodes from 0 to 500 Hz. According to these results, some effective measures have been taken to weaken the influence of helium pressure fluctuation, avoid mechanical resonances and improve the reliability of the RF system.
- Spoke012 ,
- Lorentz transfer function ,
- piezo fast tuner transfer function ,
- mechanical eigenmodes

References

[1]	J. Y. Tang, P. Cheng, H. P. Geng et al, Conceptual Physics Design for the China-ADS Linac, in Proceedings of PAC, 2013, Pasadena, CA, USA, 2013
[2]	H. Li, P. Sha, H. Huang et al, Chin. Phys. C, 36(8):761-764 (2012)
[3]	H. Li, J. P. Dai, P. Sha et al, Chin. Phys. C, 38(7):130-134 (2014)
[4]	N. Liu, Y. Sun, G. W. Wang et al, Chin. Phys. C, to be published
[5]	Z. A. Conway and M. U. Liepe, Fast piezoelectric actuator control of microphonics in the CW Cornell ERL injector cryomodule, in Proceedings of PAC09, Vancouver, BC, Canada
[6]	R. Rybaniec, L. J. Opalski, I. Wut et al, Microphonic disturbances prediction and compensation in pulsed superconducting accelerators, in Proceedings of IPAC2015, Richmond, VA, USA
[7]	Zachary A. Conway, Electro-mechanical interacttions in superconducting spoke-loaded cavities, Ph.D. Thesis (Urbana:University of Illinois at Urbana-Champaign, 2007)

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Xue-Fang Huang, Yi Sun, Guang-Wei Wang, Shao-Zhe Wang, Xiang Zheng, Qun-Yao Wang, Rong Liu, Hai-Ying Lin and Mu-Yuan Wang. Measurement of the transfer function for a spoke cavity of C-ADS Injector I[J]. Chinese Physics C, 2017, 41(4): 047001. doi: 10.1088/1674-1137/41/4/047001

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Received: 2016-09-01

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Measurement of the transfer function for a spoke cavity of C-ADS Injector I

Corresponding author: Xue-Fang Huang,

1. University of Chinese Academy of Sciences, Beijing 100049, China
3.
4.

Received Date: 2016-09-01
Available Online: 2017-04-05

Fund Project: null

Abstract: The spoke cavities mounted in the China Accelerator Driven sub-critical System (C-ADS) have high quality factor (Q) and very small bandwidth, making them very sensitive to mechanical perturbations, whether external or self-induced. The transfer function is used to characterize the response of the cavity eigenfrequency to the perturbations. This paper describes a method to measure the transfer function of a spoke cavity. The measured Lorentz transfer function shows there are 206 Hz and 311 Hz mechanical eigenmodes excited by Lorentz force in the cavity of C-ADS, and the measured piezo fast tuner transfer function shows there are 12 mechanical eigenmodes from 0 to 500 Hz. According to these results, some effective measures have been taken to weaken the influence of helium pressure fluctuation, avoid mechanical resonances and improve the reliability of the RF system.

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Measurement of the transfer function for a spoke cavity of C-ADS Injector I

Corresponding author: Xue-Fang Huang,

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