Critical current properties of fine filament superconducting wires for the SSC

Nb-Ti superconducting wires with high performance were developed and manufactured at the Furukawa Electric Co., Ltd. under the Superconducting Super Collider (SSC) vendor qualification program. The authors report the result of the experiment intended to enhance the superconductivity performance. This experiment was intended specifically to examine the effects of the heat treatment schedule on the critical current density (J/sub c/), effects of production conditions, other than heat treatment conditions, as represented by extrusion of monofilament and multifilament billets, and the difference in NbTi sources and difference in the thickness of the Nb barrier used as a diffusion preventive material while using mass-produced superconducting wire. The correlation between J/sub c/ and the resultant wire drawing performance is summarized.<>