Strain analysis and preliminary test of an all-superconducting high-field magnet generating 32.4 T direct-current magnetic field

作者：Xintao Zhang, Liangjun Shao, Peng Gao, Shuai Hu, Wenzhe Hong, Yufan Yan, Shuqing Zhang, Zhaoran Wang, Mingliang Liu, Shuowei Gao, Mianjun Xiao, Peng Song, Hongjun Ma, Liang Guo, Huan Jin, Yi Shi, Zhiyong Hong, Chao Zhou, Jinggang Qin, Fang Liu, Timing Qu, Huajun Liu, Yuntao Song, Jiangang Li · 发表于：Superconductor Science and Technology · 年份：2024 · DOI：10.1088/1361-6668/ad85fe · 被引用次数：25 · 研究领域：Superconducting Materials and Applications、Spacecraft and Cryogenic Technologies、Magnetic Properties of Alloys

Abstract A higher available magnetic field can provide more flexibility for significant research and construction. Inserting a feasible high-temperature-superconducting (HTS) magnet inside a low-temperature-superconducting (LTS) external is becoming an efficient method to build ultra-high-field (UHF) magnets. However, HTS insert magnets exhibited a concentration of magnetic strain during the energization, significantly owing to the screening-current effect. This phenomenon affects the structural integrity of HTS magnets, posing a difficulty for UHF magnets to reach a center field larger than 30 T. In this paper, we report the recent progress of the 35 T all-superconducting UHF magnet project. The full-cycle development of this homemade UHF magnet was a strong collaboration with multiple domestic institutions in China. We used commercial REBa 2 Cu 3 O 7 − x (RE = rare earth element, REBCO) conductors to wind the 20 T HTS insert. Specifically, we optimized the electromagnetic design of this HTS insert with consideration of screening-current induced strain. We applied the no-insulation and metal-as-insulation winding techniques simultaneously to balance the time constant of the two nested REBCO coils. During the excitation test, the HTS insert maintained a 256 A operation current as designed for nearly 18 h. With the energization of LTS external magnet, the entire facility reached a center field larger than 20 T for 16 h, 30 T for 6.35 h and 32 T for 2 h....