R&D for High Efficiency Enhancement of Nb₃Sn Superconducting Wire by Tube Method for AC use

Abstract

Super-GM (Engineering Research Association for Superconductive Generation Equipment and Materials, Japan) has been conducting R&D on 70MW class superconductive generatorequipment and superconductors since FY 1988. We have been a part of Super GM and developed the Nb₃Sn superconductor by tube method for AC application since FY 1989. In this paper, we report the results of R & D which are the measurement results of the hysteresis losses of the Nb₃Sn superconducting wires from 4.2K to 10K, the properties of the AC Nb₃Sn superconducting cables with high current capacity and the AC elemental coil manufactured by R&W method.