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

Abstract

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.

High critical current density in low-cost iron-based superconducting round wires annealed at ambient pressure

“…Moreover, the high-performance 100 m-long tape has already been fabricated and applied in prototypes of iron-based pancake coils and racetrack coils [13][14][15]. Notably, the stacked pancake coils generated a tesla class field at a background field of 20 T, indicating the competitive potential of IBSs for highfield applications [16].…”

Investigation of normal zone propagation velocity in AgSn/Ag/Ba122 superconducting tapes using a conduction cooling test system

“…door for its application. The researchers have begun to develop the IBS coils [5][6][7]. Zhang et al fabricated the first racetrack coil using the 100 meter 7-filamentary IBS tape.…”

Iron-based superconductors have joined the practical high-field magnet family

“…In the Letter by Ding et al [14], the successful generation of magnetic field of over 1 T using 7-filamentary Ag/AgSn double-sheathed (Ba,K)Fe 2 As 2 superconducting tapes with a total length over 350 m is reported. Although the magnetic field of 1 T is by no means high enough, it can be an entry point for high-field magnets since it is not easy to generate it using conventional conductors.…”