Abstract: A method of producing multifilament superconducting Nb3Sn wire with low bridging potential during reaction by introducing a diffusion/reaction barrier between the filaments as a radial sheet. The barrier is made of Ta, Va, a NbTa alloy or other ductile material.

Abstract: The process for preparing a precursor Nb.sub.3 Sn superconductor wire first assembling a billet comprising Nb rods surrounded by Cu material. A barrier material such as Nb is placed around the Cu and an outer stabilizer tube encases the billet. The billet is then preferably hot compacted after which it is extruded at an elevated temperature. A Sn rod is placed in the center of the billet and the entire composite is then drawn and twisted to the final size desired.

Abstract: A multifilament superconductor having continuous, non-random pinning centers and including a plurality of parallel superconductive subfilaments of uniform cross-sectional area, the subfilaments being embedded in generally hexagonal pinning jackets, and the pinning jackets together forming a structure having a honeycomb-like cross-section, the jackets having a wall thickness that is substantially an integral multiple of the coherence length of the subfilaments in a predetermined field, the jackets together forming a plurality of continuous paths for fluxoids across the superconductor, whereby total pinning density of said superconductor is substantially increased, and the critical field strength of the superconductor is enhanced.