Temperature Scaling on Pinning Force of Composite CuNb/Nb3Sn Wire

Critical temperature, critical current density, and upper critical flux density of a Nb3Sn multifilamentary wire with a CuNb reinforcing stabilizer have been measured to investigate the temperature scaling on the pinning force in the ranges of 4.2≤T≤10.0K and 4.0≤B≤15.0T, where Fp=ABc2m(T)bp(1-b)q and b=B/Bc2. From the Jc and Bc2 measurements with theoretical analyses, the characteristic values of Tc-16.9K and Bc2(0)-28.0T have been obtained. As a result, the temperature scaling law was given with the pinning parameters of m=2.30, p=0.92, and q=2.15. A factor decreases with the increase in the strain because not only superconducting bulk property changes but also the microstructure is affected.