STRAIN DEPENDENCE OF THE CRITICAL CURRENT AND CRITICAL-FIELD IN MULTIFILAMENTARY NB3SN COMPOSITES

High-J multifilamentary Nb3Sn superconductors with widely C varying amounts of prestrain and critical field values can be characterized fairly accurately by a single normalized critical field-strain relationship. Such a relationship permits first order prediction of critical-current degradation at arbitrary magnetic field magnitudes knowing only two parameters for any conductor, the prestrain and the maximum critical field. Some of the conductor-fabrication factors affecting the parameters are considered. © 1979 IEEE