Flux trapping behavior in a joint-less closed-loop 2G-HTS coil under multi-pulse magnetic field excitation

doi:10.1088/1674-1056/adcdf0

Abstract Second-generation high-temperature superconducting (2G-HTS) magnets operating in persistent current mode (PCM) hold great promise for applications such as magnetic resonance imaging. The development of joint-less closed-loop magnets has effectively tackled the challenges of fabricating joints for REBCO tape. However, certain closed-loop magnets cannot utilize conventional persistent current switches (PCS) and instead require multi-pulse magnetization techniques. This study explores the effects of multi-pulse magnetic field excitation on the flux trapping behavior of a four-pancake coil (FPC). A detailed comparison of the effects of different pulse types and periods on the FPC reveals that the background magnetic field exceeds the critical magnetic field of the coil, thereby creating resistance in the superconducting loop. The critical magnetic field of the FPC is determined experimentally, and a reasonable speculation on the multi-pulse field excitation mechanism is presented.

Keywords: joint-less coil second-generation high-temperature superconducting (2G-HTS) coil multi-pulse excitation

Received: 23 February 2025
Revised: 11 April 2025
Accepted manuscript online: 17 April 2025

PACS:	07.55.Db	(Generation of magnetic fields; magnets)
	74.72.-h	(Cuprate superconductors)
	84.71.Ba	(Superconducting magnets; magnetic levitation devices)
	84.71.Mn	(Superconducting wires, fibers, and tapes)

Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFE03150203), the National Natural Science Foundation of China (Grant Nos. U2032217, 52072366, and 52477031), and Shandong Provincial Natural Science Foundation (Grant No. ZR2024ME217).

Corresponding Authors: Daxing Huang, Hongwei Gu, Fazhu Ding
E-mail: huangdaxing@mail.iee.ac.cn;guhw@mail.iee.ac.cn;dingfazhu@mail.iee.ac.cn

Cite this article:

Hao Dong(董浩), Daxing Huang(黄大兴), Hao Yu(于昊), Hongwei Gu(古宏伟), and Fazhu Ding(丁发柱) Flux trapping behavior in a joint-less closed-loop 2G-HTS coil under multi-pulse magnetic field excitation 2025 Chin. Phys. B 34 070702

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Flux trapping behavior in a joint-less closed-loop 2G-HTS coil under multi-pulse magnetic field excitation

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