TY - JOUR
T1 - Strain analysis and preliminary test of an all-superconducting high-field magnet generating 32.4 T direct-current magnetic field
AU - Zhang, Xintao
AU - Shao, Liangjun
AU - Gao, Peng
AU - Hu, Shuai
AU - Hong, Wenzhe
AU - Yan, Yufan
AU - Zhang, Shuqing
AU - Wang, Zhaoran
AU - Liu, Mingliang
AU - Gao, Shuowei
AU - Xiao, Mianjun
AU - Song, Peng
AU - Ma, Hongjun
AU - Guo, Liang
AU - Jin, Huan
AU - Shi, Yi
AU - Hong, Zhiyong
AU - Zhou, Chao
AU - Qin, Jinggang
AU - Liu, Fang
AU - Qu, Timing
AU - Liu, Huajun
AU - Song, Yuntao
AU - Li, Jiangang
N1 - Publisher Copyright:
© 2024 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.
PY - 2024/12
Y1 - 2024/12
N2 - 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 REBa2Cu3O 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. It finally reached a 32.4 T center field, at which point the LTS external quenched, inducing the HTS insert to quench as well. After quench, the HTS magnet can maintain 229 A operation current during the postmortem standalone test. This 32.4 T result exhibits the effectiveness of considering the screening-current induced strain to enhance the structural integrity of REBCO magnets, and verifies the high reliability of REBCO magnets by generating a long-duration high field environment without any quench accident originating from the REBCO magnet.
AB - 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 REBa2Cu3O 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. It finally reached a 32.4 T center field, at which point the LTS external quenched, inducing the HTS insert to quench as well. After quench, the HTS magnet can maintain 229 A operation current during the postmortem standalone test. This 32.4 T result exhibits the effectiveness of considering the screening-current induced strain to enhance the structural integrity of REBCO magnets, and verifies the high reliability of REBCO magnets by generating a long-duration high field environment without any quench accident originating from the REBCO magnet.
KW - magnetic strain
KW - REBCO conductors
KW - screening-current effect
KW - ultra-high-field magnets
UR - https://www.scopus.com/pages/publications/85208286877
U2 - 10.1088/1361-6668/ad85fe
DO - 10.1088/1361-6668/ad85fe
M3 - 文章
AN - SCOPUS:85208286877
SN - 0953-2048
VL - 37
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
IS - 12
M1 - 125003
ER -