Critical current density of a superconducting copper-base alloy containing Nb3Sn filaments

Abstract
The critical current density Jc of 0.25‐mm Cu88.5Nb10.0Sn1.5 and Cu83.5Nb15.0Sn1.5 wires has been measured at 4.2 °K as a function of magnetic field H up to 100 kG. A typical value of Jc at H = 0 is ∼105 A/cm2 indicating that the critical current density of the Nb3Sn filaments is probably of the order of 106 A/cm2. Mechanical deformation such as bending some of the wire samples around a 1/2‐in.‐diam mandrel does not produce any significant degradation of Jc at H =40 kOe.

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