Nb-Sn phase superconducting wire and precursor wire thereof

摘要

The Nb-Sn phase superconducting wire 15 elongating in the longitudinal direction and having a cross section including a core part and a shell part surrounding of the core part. The wire 15 includes a core part made of only bronze 17 and a shell part including: a matrix made of bronze 17; and Nb₃Sn filaments 16 embedded in the bronze, wherein the Nb₃Sn filaments 16 are radially arranged and electromagnetically and radially coupled to one another in the radius direction of the wire 15 in the surrounding of the core part, and wherein the Nb₃Sn filaments 16 have larger diameters toward the outside, and the Nb₃Sn filaments 16 are kept at spacing so as to electromagnetically isolated from one another in the circumferential direction of the wire 15.