Precursor wire for compound superconducting wire, compound superconducting wire, and rewinding method for compound superconducting wire

A precursor wire for compound superconducting wire, comprising:

• a compound superconducting precursor member configured by a plurality of compound superconducting precursor filaments, and a first matrix precursor embedding the plurality of compound superconducting precursor filaments and including a first stabilizing material;
• a cylindrical reinforcing member arranged at the outer circumferential side of the compound superconducting precursor member, and configured by a plurality of reinforcing filaments, and a second matrix embedding the plurality of reinforcing filaments and including a second stabilizing material;
• and
• a cylindrical stabilizing member arranged to at least one of the inner circumferential side or outer circumferential side of the reinforcing member, and consisting of a third stabilizing material,
• wherein an aspect ratio Ab1 (Wb1/Tb1) of a width dimension Wb1 of the compound superconducting precursor member relative to a thickness dimension Tb1 of the compound superconducting precursor member in a cross section perpendicular to a longitudinal direction of the compound superconducting precursor member is 1.80 or more, and
• the number of the precursor wire for compound superconducting wire is one.