First performance test of FeSe0.5Te0.5 coated conductor coil under high magnetic fields

This study has, for the first time, combined iron-based superconductor (IBS) with high field insert coil technology to generate a higher magnetic field. Nine large-sized iron-based superconducting double pancake coils were fabricated and their performance was evaluated at 4.2 K. Subsequently, seven double pancake coils with superior performance were assembled to form an IBS insert coil and tested at the 20T background field. The test results indicate that the insert coil successfully generated above 1T magnetic field under the 0T, 10T, and even 20T background field, respectively. Notably, the poorest IBS double pancake coil still had a critical current of about 84A at the background field of 20T, which outperformed all previously reported performance tests of IBS coils. This paper provides a detailed introduction to the design and fabrication process of the IBS insert coil, presents the test results, and discusses them.

Section: Introductionmentioning

confidence: 69%

Development of the first Tesla class iron-based superconducting coil for high field application

Ding,

Zhao,

Huang

et al. 2023

“…In 2023, Wei et al prepared a hybrid coil consisting of one 3.5-turn FeSe 0.5 Te 0.5 SP coil and eight 14-turn YBCO DP coils. The I c value of the FeSe 0.5 Te 0.5 SP coil is 17.4 A at 4.2 K and 10 T, which is almost the same performance as the short FeSe 0.5 Te 0.5 tape [31].…”

Section: Introductionmentioning

confidence: 72%

Development of metal-insulated iron-based superconducting coils and charging tests under high magnetic fields up to 32 T

Li,

Zhou,

Zhu

et al. 2023

Self Cite

To explore the potential of iron-based superconducting (IBS) tapes in high-field applications, IBS pancake coils were dry-wound using the uninsulated IBS tape, supplemented with cowound stainless steel tapes for reinforcement. We have successfully fabricated a double pancake coil (DP-1) and a series-connected coil consisting of six DP coils (DP-6). These coils underwent multiple charging tests in a 35 T resistive magnet and retesting in a 14 T superconducting magnet. After conducting multiple rounds of retesting in two different background field magnets, it was found that the IBS coils did not show any degradation in their current-carrying performance. The critical current (I c) value of the DP-1 at 4.2 K and 32 T reached 60 A. To systematically evaluate the I c performance of the six coils in the DP-6, we monitored the V–I curves between 26 voltage taps. The resistive voltage rise was observed at low charging currents, indicating that each coil has suffered different levels of damage. Nevertheless, the overcurrent tests demonstrated that the IBS coil can still carry a current far exceeding its I c without irreversible degradation. We concluded the possible reasons for these phenomena by analyzing the experimental details and test data. In addition, the coil’s internal structure was observed to assess the quality of coil winding, joint soldering, and epoxy resin impregnation. This study will provide references for the electromagnetic and mechanical properties of IBS tapes under ultra-high magnetic fields and contribute to the future development of higher-performance practical IBS coils.

“…In the paper, Wei et al [25] reports on the first fabrication and test of a coil made from FeSe 0.5 Te 0.5 coated conductor tapes. The FeSe 0.5 Te 0.5 coated conductor was fabricated on the CeO 2 buffered IBAD-MgO metal tapes by Shanghai Jiao Tong University.…”

mentioning

confidence: 99%

Successful development of an iron-based coated conductor magnet

Zhang

2024