Stress effect on I c of multifilamentary V3Ga wire

Abstract
Measurement of stress effects on the critical current Ic of multifilament V3Ga wire are reported, and the cryostat for performing these studies is described. Measurements were taken at 4.2 K in a magnetic field of 9.0 T and for stress values up to 5×108 Pa. Noticeable degradation of Ic did not begin in the wires reported here until stress values of 3.0×108 Pa. The first effect of stress was to produce a measurable resistance in the wire below Ic. A discussion of this low‐current onset of resistance is given which suggests that improved stress characteristics in A15 wires may correlate with the reduction or elimination of this resistance.