Development of an internally reinforced superconductor for a high-field pulsed magnet

Abstract We are developing a Nb 3 Sn superconductor internally reinforced with a high elastic modulus fiber for the application of high-field pulsed superconducting magnets. Short lengths of monofilamentary conductors are prepared by rf-magnetron sputtering. Critical current measurement up to 10T and a bending test of the conductor have been carried out for the purpose of proof of principle. Critical current density of about 1 × 10 9 A/m 2 /niobium at 4.2 K under 10 T has been obtained up to now, which is about a half of a commercial bronze-processed conductor. Results of the bending test showed that the superconductor suffers no damage up to 0.5% of bending strain at room temperature. SEM pictures of the conductor after the bending test suggested good adhesion between the core fiber and the Nb 3 Sn layer.