Speaker
Description
Iron-based superconductors (IBS) are very promising candidates for high-field magnet applications owing to their ultrahigh upper critical fields and very small anisotropy. In recent years, tremendous progress has been made on the critical current density (Jc) of IBS wires and tapes based on a powder-in-tube technique, e.g., high transport Jc up to 2.2×105 A cm-2 at 4.2 K and 10 T was achieved in 122 type IBS tapes. Furthermore, the transport Jc of IBS tapes with high-strength composite metal sheath such as Cu/Ag and Stainless steel/Ag was enhanced above 105 A cm-2 at 4.2 K and 10 T as well. On the other hand, with hot isostatic pressing process, the Jc-performance of IBS round wires was also significantly improved. With the achievement of high-performance multifilamentary IBS long-length tapes, the first IBS single pancake coil and double pancake coil were fabricated and tested at 24 T and 30 T background field, respectively. Two IBS racetrack coils using 100-meter long IBS tapes were successfully made and tested in a superconducting dipole magnet which provided a maximum background field of 10 T at 4.2 K. These results demonstrate the great potential of IBS wires in high-field accelerator applications.
