Numerical analysis and experimental study of multi-field behaviour of fast ramping superconducting solenoids

Liu Meilou; Wu Beimin; Ma Lizhen; Yin Yongzhi; Ren Wenhui; Yang Tongjun; Dong Xuecheng; Ou Xianjin; Yao Qinggao; Qiao Weiyu

doi:10.11884/HPLPB202537.240131

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Liu Meilou, Wu Beimin, Ma Lizhen, et al. Numerical analysis and experimental study of multi-field behaviour of fast ramping superconducting solenoids[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.240131

Citation:

Liu Meilou, Wu Beimin, Ma Lizhen, et al. Numerical analysis and experimental study of multi-field behaviour of fast ramping superconducting solenoids[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.240131

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Numerical analysis and experimental study of multi-field behaviour of fast ramping superconducting solenoids

doi: 10.11884/HPLPB202537.240131

1.
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2.
Lanzhou University, Lanzhou 730000, China; *. Corresponding author

Received Date: 2024-04-19
Accepted Date: 2024-04-19
Rev Recd Date: 2025-01-05

Available Online: 2025-04-28

Abstract

Abstract

The Peking University (petawatt) laser proton accelerator develops a laser proton radiotherapy system in response to the needs of proton radiation tumor treatment. The common collection section of its horizontal and vertical beam lines mainly consists of three superconducting solenoids (S₁-S₃). Large stresses are generated in the solenoids during the cooling down and excitation process, in addition, the superconducting solenoids are operated by fast ramping, and the AC loss in the process will have an important impact on the solenoid excitation speed and stable operation. In this paper, the highest field strength and the most complex structure of 7.8T-120 mm solenoid S1 is taken as the research object, and COMSOL Multiphysics software is used to carry out the stress analysis of superconducting solenoids under multi-field conditions, and at the same time, the simulation of the AC loss due to the rapid change of the current is carried out. Subsequently, corresponding experimental studies were carried out to obtain the variation curves of strain with temperature, correlations betweencurrent, magnetic field and strain correspondingly. According to the experiment data, there is a significant positive correlation between the measured values of magnetic field and strain and the change of current, which verifies the rationality of the superconducting solenoid design. It provides experience and reference for the subsequent design and development of similar superconducting magnets.
- superconducting solenoid,
- cooling down and excitation,
- stress and strain,
- fast ramping,
- experimental study

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References(7)

References

[1]	郭之虞, 刘克新, 颜学庆. 陈佳洱与北京大学重离子物理研究所的粒子加速器研究[J]. 科学通报, 2023, 68(9):1000-1003 doi: 10.1360/TB-2022-1085 Guo Zhiyu, Liu Kexin, Yan Xueqing. Jiaer Chen and the particle accelerator research at the Institute of Heavy Ion Physics, Peking University[J]. Chinese Science Bulletin, 2023, 68(9): 1000-1003 doi: 10.1360/TB-2022-1085
[2]	温杰, 颜学庆, 王俊杰. 肿瘤质子治疗及进展——精准治疗的全新策略[J]. 癌症进展, 2016, 14(9):834-839 Wen Jie, Yan Xueqing, Wang Junjie. Tumour proton therapy and progress - a new strategy for precision therapy[J]. Oncology Progress, 2016, 14(9): 834-839
[3]	李亚东. 强场Nb₃Sn-NbTi混合型超导聚焦螺线管的研制[D]. 兰州: 中国科学院研究生院(近代物理研究所), 2016 Li Yadong. Design of high field Nb₃Sn-NbTi hybrid superconducting focusing solenoid[D]. Lanzhou: Institute of Modern Physics, Chinese Academy of Sciences, 2016
[4]	吴北民. 大型超导磁体复杂结构装配及运行过程中的多场力学问题研究[D]. 兰州: 兰州大学, 2021 Wu Beimin. Study on multi-field mechanical problems of large superconducting magnet with complex structures during assembly and operation[D]. Lanzhou: Lanzhou University, 2021
[5]	卢家琪. 离散余弦型加速器超导磁体的多场耦合分析与实验研究[D]. 兰州: 中国科学院大学(中国科学院近代物理研究所), 2023 Lu Jiaqi. Multi-field coupling analysis and experimental study of discrete-cosine-theta accelerator superconducting magnets[D]. Lanzhou: Institute of Modern Physics, Chinese Academy of Sciences, 2023
[6]	Chen Jiangbo, Jiang Xiaohua. Stress analysis of a 7 T actively shielded superconducting magnet for animal MRI[J]. IEEE Transactions on Applied Superconductivity, 2012, 22: 4903104. doi: 10.1109/TASC.2011.2176550
[7]	Thekkethil S R, Kar S, Kumar M, et al. Stress-induced magnetic field inhomogeneity in a 1.5 T superconducting MRI magnet[J]. IEEE Transactions on Applied Superconductivity, 2018, 28: 4401905.