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

Hang Zhu; Jiyuan Zhai; Jianping Dai

doi:10.11884/HPLPB202234.220061

Journals >High Power Laser and Particle Beams >Volume 34 >Issue 10 >Page 104015 > Article

High Power Laser and Particle Beams
Vol. 34, Issue 10, 104015 (2022)

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

Hang Zhu^1、2, Jiyuan Zhai^1、2、*, and Jianping Dai¹

Author Affiliations

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

²University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.11884/HPLPB202234.220061 Cite this Article

Hang Zhu, Jiyuan Zhai, Jianping Dai. Research on fast pre-tuning method of 9-cell superconducting cavities[J]. High Power Laser and Particle Beams, 2022, 34(10): 104015 Copy Citation Text

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Fig. 1. Circuit model of multi-cell cavity

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Fig. 2. 9-cell cavity N005 field flatness tuning

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cell number	perturbation amount $ {e}_{\mathrm{r}\mathrm{e}\mathrm{f}}/{10}^{-4} $	perturbation amount $ {e}_{\mathrm{D}\mathrm{E}\mathrm{S}\mathrm{Y}}/{10}^{-4} $	perturbation amount $ {e}_{\mathrm{C}\mathrm{o}\mathrm{r}\mathrm{n}\mathrm{e}\mathrm{l}\mathrm{l}}/{10}^{-4} $
1	5	4.96	6.21
2	4	3.93	4.18
3	−4	−4.03	−4.84
4	2	2.02	1.90
5	−3	−2.99	−2.70
6	2	2.03	1.97
7	−1	−0.99	−1.35
8	−4	−3.99	3.50
9	6	6.02	5.92

Table 1. Comparison of perturbation calculation results between DESY and Cornell pre-tuning method

cell number	percentage error $ {E}_{\mathrm{D}\mathrm{E}\mathrm{S}\mathrm{Y}} $/%	percentage error $ {E}_{\mathrm{C}\mathrm{o}\mathrm{r}\mathrm{n}\mathrm{e}\mathrm{l}\mathrm{l}} $/%
1	−0.84	24.14
2	−1.87	4.61
3	0.71	20.96
4	0.94	−4.94
5	−0.47	−9.98
6	1.41	−1.42
7	−1.46	35.15
8	−0.03	−12.49
9	0.25	−1.26

Table 2. Comparison of perturbation percentage error of DESY and Cornell pre-tuning method

field flatness/%	RMSE $ {\eta }_{\mathrm{d}\mathrm{e}\mathrm{s}\mathrm{y}}/{10}^{-4} $	RMSE $ {\eta }_{\mathrm{C}\mathrm{o}\mathrm{r}\mathrm{n}\mathrm{e}\mathrm{l}\mathrm{l}}/{10}^{-4} $
60	0.055	2.11
70	0.076	2.74
80	0.033	0.96
90	0.015	0.45

Table 3. Perturbation RMS error of DESY and Cornell method with different field flatness

method	number of cells tuned	measure time/h	tuning time/h	total time/h
Cornell only	22 (FF ＞ 95%)	0.2	6.6	6.8
DESY only	9 (FF ＜ 90%)	0.6	2.7	3.3
combined method	13 (FF ＞ 95%)	0.9	3.9	4.8

Table 4. Pre-tuning time of different methods for 95% field flatness (FF)

Hang Zhu, Jiyuan Zhai, Jianping Dai. Research on fast pre-tuning method of 9-cell superconducting cavities[J]. High Power Laser and Particle Beams, 2022, 34(10): 104015

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