Research on fast pre-tuning method of 9-cell superconducting cavities

Zhu Hang; Zhai Jiyuan; Dai Jianping

doi:10.11884/HPLPB202234.220061

Volume 34 Issue 10

Aug. 2022

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Article Navigation > High Power Laser and Particle Beams > 2022 > 34(10): 104015

Zhu Hang, Zhai Jiyuan, Dai Jianping. Research on fast pre-tuning method of 9-cell superconducting cavities[J]. High Power Laser and Particle Beams, 2022, 34: 104015. doi: 10.11884/HPLPB202234.220061

Citation:

Zhu Hang, Zhai Jiyuan, Dai Jianping. Research on fast pre-tuning method of 9-cell superconducting cavities[J]. High Power Laser and Particle Beams, 2022, 34: 104015. doi: 10.11884/HPLPB202234.220061

Zhu Hang, Zhai Jiyuan, Dai Jianping. Research on fast pre-tuning method of 9-cell superconducting cavities[J]. High Power Laser and Particle Beams, 2022, 34: 104015. doi: 10.11884/HPLPB202234.220061

Citation:

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Research on fast pre-tuning method of 9-cell superconducting cavities

doi: 10.11884/HPLPB202234.220061

Zhu Hang^{1, 2
,},
Zhai Jiyuan^{1, 2
,
,},
Dai Jianping¹

1.
Accelerator Research Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2022-03-05
Rev Recd Date: 2022-06-13

Available Online: 2022-06-16

Publish Date: 2022-08-22

Abstract

Abstract

The pre-tuning of frequency and field flatness is one of the most time-consuming post-processing procedures for 9-cell superconducting cavities, and will soon become the bottleneck of mass production of 9-cell cavities in domestic related major scientific projects. In this paper we firstly introduce two commonly used pre-tuning methods for 9-cell superconducting cavities, namely DESY method and Cornell method. Then we analyze and compare their calculation accuracy and error sources by modeling, and make a correction on the Cornell method’s tuning amount calculation. Verifing the pre-tuning of several cavities by the experimental research, we give a fast pre-tuning method in which DESY reconstruction algorithm is used for coarse-tuning as it has high precision and rapid tuning speed in low field flatness and Cornell perturbation algorithm is used for fine-tuning as it has high precision in high field flatness with faster measurement. Combining these two tuning algorithms, the pre-tuning is divided into two steps: coarse tuning and fine tuning, which can effectively improve the pre-tuning speed of the 9-cell superconducting cavity.
- 9-cell superconducting cavity,
- pre-tuning,
- field flatness,
- bead pull measurement

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References(16)

References

[1]	The CEPC Study Group. CEPC conceptual design report: volume 1—accelerator[R]. IHEP-AC-2018-01, 2018: 88-94.
[2]	Bambade P, Barklow T, Behnke T, et al. The international linear collider: a global project[R]. DESY 19-037, 2019: 8-12.
[3]	Singer W, Brinkmann A, Brinkmann R, et al. Production of superconducting 1.3-GHz cavities for the European X-ray Free Electron Laser[J]. Physical Review Accelerators and Beams, 2016, 19: 092001. doi: 10.1103/PhysRevAccelBeams.19.092001
[4]	Marhauser F, Daly E F, Fitzpatrick J A, et al. Status of the LCLS-II accelerating cavity production[C]//Proceedings of IPAC 2017. 2017: 1164-1166.
[5]	Huang Nanshun, Deng Haixiao, Liu Bo, et al. Features and futures of X-ray free-electron lasers[J]. The Innovation, 2021, 2: 100097.
[6]	李波, 刘华昌, 王云, 等. CSNS-II超导椭球腔形变电场平坦度仿真分析[J]. 强激光与粒子束, 2021, 33:034001 doi: 10.11884/HPLPB202133.200259 Li Bo, Liu Huachang, Wang Yun, et al. Simulating analysis on electric field flatness of deformed superconducting elliptical cavity for CSNS-II linac[J]. High Power Laser and Particle Beams, 2021, 33: 034001 doi: 10.11884/HPLPB202133.200259
[7]	Shishido T, Kako E, Noguchi S, et al. Frequency tuning of an accelerating mode in STF baseline SC cavities[C]//Proceedings of the 3rd Annual Meeting of Particle Accelerator Society of Japan and the 31th Linear Accelerator Meeting in Japan. 2006: 865-867.
[8]	Shishido T, Kako E, Noguchi S. Development of pre-tuning system for 972 MHz 9-cell superconducting cavities[C]//Proceedings of the 11th Workshop on RF Superconductivity. 2003: 425-428.
[9]	Tajima T, Furuya T, Suzuki T, et al. Pre-tuning of TRISTAN superconducting RF cavities[C]//Proceedings of the Fourth Workshop on RF Superconductivity. 1989: 821-847.
[10]	Sekutowicz J, Chen Yinghua, Wei Yixiang. A different tuning method for accelerating cavities[C]//Proceedings of the Fourth Workshop on RF Superconductivity. 1989: 849-857.
[11]	Padamsee H, Knobloch J, Hays T. RF superconductivity for accelerators[M]. New York: Wiley, 1998: 129-143.
[12]	Liu Yang, He Feisi, Xu Wencan, et al. Tuning for the first 9-cell TESLA cavity of PKU[J]. Chinese Physics C, 2010, 34(4): 496-498. doi: 10.1088/1674-1137/34/4/015
[13]	郭志达, 李中泉, 翟纪元, 等. 1.3 GHz 9单元Ichiro型模型铜腔的预调谐[J]. 强激光与粒子束, 2011, 23(1):175-178 doi: 10.3788/HPLPB20112301.0175 Guo Zhida, Li Zhongquan, Zhai Jiyuan, et al. Pretuning of 1.3 GHz 9-cell Ichiro copper cavity[J]. High Power Laser and Particle Beams, 2011, 23(1): 175-178 doi: 10.3788/HPLPB20112301.0175
[14]	Tang Zhengbo, Ma Zhenyu, Hou Hongtao, et al. Frequency control and pre-tuning of a large aperture 500 MHz 5-cell superconducting RF cavity[J]. Nuclear Science and Techniques, 2014, 25: 030102.
[15]	Arnold A, Buettig H, Janssen D, et al. Field reconstruction by passband frequency measurement at the Rossendorf SRF-gun cavity[C]//Proceedings of SRF 2007. 2007: 689-691.
[16]	Slater J C. Microwave electronics[J]. Reviews of Modern Physics, 1946, 18(4): 441-512. doi: 10.1103/RevModPhys.18.441