Development of Nb3Sn AC superconducting wire. Pt. 2

For the realization of superconducting power apparatus, it is important that the development of highly stable superconducting cables. Nb3Sn wire has higher critical temperature than NbTi wire. Therefore, it is possible to make highly stable superconducting wires. In this report, we examine a manufacturing process of Ac Nb3Sn wire. This manufacturing process has four times higher critical current density than conventional processes. We have made a 400 kVA class AC coil with React and Wind method. The loss density of this coil was 20MW/m3 at just before the quench. In this case, the temperature of cable increased about 3.8 K. This means that the Nb3Sn coil has a very high stability. (author)