Axial tensile strain/transverse compressive stress characteristics in high strength Nb₃Sn superconducting wires

In order to improve the strain/stress characteristics of the critical current I_c, the availability of Nb matrix as well as the external CuNb reinforcing stabilizer to bronze processed Nb₃Sn multifilamentary superconducting wires has been examined up to the magnetic field of 14T and at a temperature of 4.2K. Although the axial tensile strain sensitivity of I_c does not change, the strain for peak I_c as well as the reversible strain limit increase in the wire with CuNb reinforcing stabilizer. Furthermore, the transverse compressive stress sensitivity of I_c decreases and the reversible stress limit increases. Although critical current density is not high, the Nb matrix Nb₃Sn wire shows higher tolerance to stress / strain. Correlation between axial strain effect and transverse compressive stress effect is briefly discussed.