Induced current of high temperature superconducting loops by combination of exciting coil and thermal switch

doi:10.1088/1674-1056/ac1f0a

中国物理B ›› 2022, Vol. 31 ›› Issue (3): 37402-037402.doi: 10.1088/1674-1056/ac1f0a

Induced current of high temperature superconducting loops by combination of exciting coil and thermal switch

Jia-Wen Wang(王佳雯), Yin-Shun Wang(王银顺)^†, Hua Chai(柴华), Ling-Feng Zhu(祝凌峰), and Wei Pi(皮伟)

State Key Laboratory of New Energy Renewable Power System, North China Electric Power University, Beijing 102206, China

收稿日期:2021-07-01 修回日期:2021-07-01 接受日期:2021-08-19 出版日期:2022-02-22 发布日期:2022-02-24
通讯作者: Yin-Shun Wang E-mail:yswang@ncepu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51977078).

Induced current of high temperature superconducting loops by combination of exciting coil and thermal switch

Jia-Wen Wang(王佳雯), Yin-Shun Wang(王银顺)^†, Hua Chai(柴华), Ling-Feng Zhu(祝凌峰), and Wei Pi(皮伟)

State Key Laboratory of New Energy Renewable Power System, North China Electric Power University, Beijing 102206, China

Received:2021-07-01 Revised:2021-07-01 Accepted:2021-08-19 Online:2022-02-22 Published:2022-02-24
Contact: Yin-Shun Wang E-mail:yswang@ncepu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51977078).

摘要/Abstract

摘要： With its commercialization, the second-generation (2G) high temperature superconducting (HTS) RE—Ba—Cu—O (REBCO, RE is rare earth) tape is extensively applied to the superconducting magnets in the high magnetic fields. However, unlike low temperature superconducting (LTS) magnets, the HTS magnet cannot operate in the persistent current mode (PCM) due to the immature superconducting soldering technique. In this paper, an exciting method for two HTS sub-loops, so-called charging and load loops, is proposed by flux pump consisting of exciting coil and controllable thermal switch. Two HTS sub-loops are made of an REBCO tape with two slits. An exciting coil with iron core is located in one sub-loop and is supplied with a triangular waveform current so that magnetic field is generated in another sub-loop. The influence of magnetic flux on induced current in load loop is presented and verified in experiment at 77 K. The relationship between the induced magnetic flux density and the current on the sub-loops having been calibrated, magnetic flux density, and induced current are obtained. The results show that the HTS sub-loops can be excited by a coil with thermal switch and the induced current increases with magnetic flux of exciting coil increasing, which is promising for persistent current operation mode of HTS magnets.

关键词: bridge, high temperature superconducting (HTS) sub-loops, induced current, thermal switch

Abstract: With its commercialization, the second-generation (2G) high temperature superconducting (HTS) RE—Ba—Cu—O (REBCO, RE is rare earth) tape is extensively applied to the superconducting magnets in the high magnetic fields. However, unlike low temperature superconducting (LTS) magnets, the HTS magnet cannot operate in the persistent current mode (PCM) due to the immature superconducting soldering technique. In this paper, an exciting method for two HTS sub-loops, so-called charging and load loops, is proposed by flux pump consisting of exciting coil and controllable thermal switch. Two HTS sub-loops are made of an REBCO tape with two slits. An exciting coil with iron core is located in one sub-loop and is supplied with a triangular waveform current so that magnetic field is generated in another sub-loop. The influence of magnetic flux on induced current in load loop is presented and verified in experiment at 77 K. The relationship between the induced magnetic flux density and the current on the sub-loops having been calibrated, magnetic flux density, and induced current are obtained. The results show that the HTS sub-loops can be excited by a coil with thermal switch and the induced current increases with magnetic flux of exciting coil increasing, which is promising for persistent current operation mode of HTS magnets.

Key words: bridge, high temperature superconducting (HTS) sub-loops, induced current, thermal switch

中图分类号: (Cuprate superconductors)

74.72.-h

74.78.-w (Superconducting films and low-dimensional structures) 84.71.Mn (Superconducting wires, fibers, and tapes) 85.25.Am (Superconducting device characterization, design, and modeling)

Jia-Wen Wang(王佳雯), Yin-Shun Wang(王银顺), Hua Chai(柴华), Ling-Feng Zhu(祝凌峰), and Wei Pi(皮伟). Induced current of high temperature superconducting loops by combination of exciting coil and thermal switch[J]. 中国物理B, 2022, 31(3): 37402-037402.

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Induced current of high temperature superconducting loops by combination of exciting coil and thermal switch

Induced current of high temperature superconducting loops by combination of exciting coil and thermal switch

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