Microstructural understanding and critical current optimization of advanced high field superconductors. Progress report, February 1, 1991--March 31, 1993.

摘要

It is of great importance to improve critical current density, J(sub c) in A15 superconductors for high field magnet applications. Most current work to improve J(sub c) in A15 wires concentrates on increasing the overall J(sub c) by increasing the fraction of superconducting phase in the wire, by improving the uniformity of the superconductor cross section along the length of the wire and by adjusting the strain state of the A15 layer. The goal of the A15 work in this group was to investigate the intrinsic J(sub c) of the A15 layer itself. To do this, a better understanding of factors controlling the intrinsic J(sub c)of the Nb(sub 3)Sn was pursued.