Improvement in high-field critical currents of i n s i t u processed Nb3Sn by titanium addition

The effects of the addition of a small amount of Ti to in situ processed Nb3Sn tape superconductors have been studied. It has been found that Ti addition significantly improves the critical current density Jc at high magnetic fields above 12 T. A Jc value of 3×104 A/cm2 at a magnetic field of 15 T parallel to the tape surface was obtained for the Cu-40 (Nb-1.6 wt. % Ti) tape reacted with Sn at 650 °C for 100 h. This enhancement in high-field performance can be associated with the incorporation of Ti into the A15 Nb3Sn.