Superconducting wire for NMR-tomography

The authors discuss the fabrication of Nb-Ti base superconducting wires having a superconductor packing factor of 15-20% and superconducting filaments of 70-80 mu m dia. Three methods of precursor fabrication were tried. The NbTi-50 alloy base superconducting wire was fabricated for the magnet system of an NMR (nuclear magnetic resonance) tomograph; the wire diameter is 0.85 mm; the packing factor is 16%; the maximum length of a single piece is 29 km. The critical current density is 6.1*10/sup 5/ A/cm/sup 2/ in a magnetic field of 1 T. The superconducting properties of similar wire on an NbTi-55 alloy base are also presented.<
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