Strain and Superconducting Properties for R&W Reinforcing and Stabilizing Nb₃Sn Coil under High Elecrtromagnetic Force

Abstract

Highly strengthened and stabilized Nb₃Sn wires have been developed utilizing CuNb. We demonstrated the high-tension-winding superconducting model coil by the “React & Wind” method using newly developed CuNb/(Nb, Ti)₃Sn wire. The mechanical and superconducting properties under a state of high electromagnetic stress were measured for the model coil. The maximum hoop stress was about 280MPa. The tensile strain of about 0.51% for transverse direction and compression strain of about 0.1% for longitudinal direction were obtained. A detailed analysis of the quenching behavior suggests that coil quenching occurred around current terminals.