First performance test of 30 mm iron-based superconductor single pancake coil under 24 T background field

TL;DR

This paper reports the first performance test of a 30 mm iron-based superconductor pancake coil under a 24 T magnetic field, demonstrating its high critical current and potential for high-field magnet applications.

Contribution

First fabrication and testing of a 30 mm IBS pancake coil under 24 T, showing high critical current and suitability for high-field applications.

Findings

Achieved 35 A critical current at 10 T and 4.2 K.

Maintained 26 A critical current under 24 T background field.

Demonstrated the coil's promising performance for high-field magnets.

Abstract

The iron-based superconductor (IBS) single pancake coil (SPC) with 30 mm inner diameter was firstly fabricated and tested under 24 T background field. This SPC was successfully made using the 7-filamentary Ba1-xKxFe2As2 (Ba122) tape by wind-and-react method. This IBS coil show the highest Ic value at magnetic field reported so far. For example, the transport critical current of this Ba122 SPC achieved 35 A at 4.2 K and 10 T, which is about half of that of short sample. This indicates that the non-insulation winding process together with the stainless-steel tape is suitable to the iron-based superconductor. Even more encouraging is the fact that the Ic of this SPC is still as high as 26 A under 24 T background field, which is still about 40% of that at zero external magnetic field. These results clearly demonstrate that the iron-based superconductors are very promising for high-field magnet applications.