Enhanced current capacity of jelly-roll processed and transformed Nb3Al multifilamentary conductors

In order to enhance the current carrying capacity, we have developed an improved fabrication process where the wire diameter can be increased from 0.5 to 1.25 mm and the Nb-matrix ratio decreased from 1.5 to 0.52, without degrading the critical current density, J(c), of Nb3Al phase. The critical current for a monolithic conductor at 21 T and 4.2 K as now been enhanced to 166 A which used to be 15 A. The compacted-strand-cables were fabricated to investigate feasibility for large-scale application uses. We have found that stranding and flat-rolling the as-quenched Nb/Nb(Al)(55) composite cause no degradation in J(c). Attempts were made to stabilize the resulting high current conductors.