Abstract: The superconducting coil includes: a winding frame; and at least two superconducting rectangular wire layers provided in such a manner that a superconducting rectangular wire is spirally wound on an outer surface of the frame such that wires adjacent to each other in an axial direction of the frame are arranged side by side and separated, the wire including an NbTi-based or Nb3Sn-based wire having a surface coated with copper or copper alloy, in which at least a thermoplastic fusible resin is provided in a separated section between the adjacent wires, and when viewed in a cross section including an axis of the frame, at least one of voids that are partitionable on outer surfaces of a total of three wires and a total of four wires located on the two adjacent layers and adjacent to each other are 4% or less in terms of a void ratio (V1).

Abstract: A resin coated superconducting wire includes a matrix resin including a synthetic resin material, and a superconducting wire in the matrix resin. In a transverse cross section of the resin coated superconducting wire, a cross section area of the matrix resin is equal to or larger than the cross section area of the superconducting wire.

Abstract: The present invention provides: a compound superconducting twisted wire in which non-adhesiveness between compound superconducting strands or separation easiness after adhesion is improved while a strength against tension is improved to a degree to be equivalent to or stronger than that of a conventional compound superconducting twisted wire; and a rewinding method thereof.

Abstract: An insulation-coated compound superconducting wire includes a compound superconducting wire having a compound superconducting part which includes a first matrix and a plurality of compound superconducting filaments containing compound superconducting phases, a reinforcing part disposed on the outer circumferential side of the compound superconducting part and includes a plurality of reinforced filaments, a second matrix and a second stabilizing material. A stabilizing part is disposed on at least one side among the inner circumferential side and the outer circumferential side of the reinforcing part. An electrical insulation part covers the outer circumferential surface of the compound superconducting wire, in which the insulation-coated compound superconducting wire has a critical current value (Ic) larger than that of the compound superconducting wire before being covered with the electrical insulation part.

Abstract: A compound superconducting wire 10 includes a reinforcement portion 12 and a compound superconductor 11. In the reinforcement portion 12, an assembly of plural reinforcement elements 4 are disposed. The reinforcement elements 4 each include plural reinforcement filaments 1 disposed in a stabilizer 2, and a stabilizing layer 3 at the outer periphery thereof. The reinforcement filaments 1 each mainly contain one or more metals selected from the group consisting of Nb, Ta, V, W, Mo, Fe, and Hf, an alloy consisting of two or more metals selected from the aforementioned group, or an alloy consisting of copper and one or more metals selected from the aforementioned group.

Abstract: A method for producing a composite superconductor includes: a structure forming process of forming a structure including a metal covering member (20) including at least one to-be-joined portion, a superconductor (30) arranged inside the metal covering member, and a reinforcing member (40) arranged between the superconductor (30) and the at least one to-be-joined portion; and a joining process of joining thereafter the at least one to-be-joined portion.

Abstract: Disclosed is a composite superconductor comprising a superconductor and a metal member. The metal member is composed of one or more members to be joined together in such manner that the one or more members cover the superconductor, and at least one member is made of aluminum or an aluminum alloy.

Abstract: A compound superconducting wire 10 includes a reinforcement portion 12 and a compound superconductor 11. In the reinforcement portion 12, an assembly of plural reinforcement elements 4 are disposed. The reinforcement elements 4 each include plural reinforcement filaments 1 disposed in a stabilizer 2, and a stabilizing layer 3 at the outer periphery thereof. The reinforcement filaments 1 each mainly contain one or more metals selected from the group consisting of Nb, Ta, V, W, Mo, Fe, and Hf, an alloy consisting of two or more metals selected from the aforementioned group, or an alloy consisting of copper and one or more metals selected from the aforementioned group.

Abstract: A method for producing a composite superconductor includes: a structure forming process of forming a structure including a metal covering member (20) including at least one to-be-joined portion, a superconductor (30) arranged inside the metal covering member, and a reinforcing member (40) arranged between the superconductor (30) and the at least one to-be-joined portion; and a joining process of joining thereafter the at least one to-be-joined portion.

Abstract: Disclosed is a composite superconductor comprising a superconductor and a metal member. The metal member is composed of one or more members to be joined together in such manner that the one or more members cover the superconductor, and at least one member is made of aluminum or an aluminum alloy.

Abstract: A superconducting cable for alternating current, comprising conductor layers formed by a plurality of tape-shaped superconducting wires wound around a center member, an electric insulating layer formed outside the conductor layers, and a plurality of shielding layers formed outside the insulating layer, wherein, the conductor layers are formed, where N is a number of layers in the conductor layers and expressed by an integer, by gradually increasing a winding pitch of conductor layers in the same direction from an inner first layer to an N/2 layer when the number of layers is even, or from an inner first layer to a (N−1)/2 layer when the number of layers is odd, and then by gradually decreasing a winding pitch of conductor layers in an opposite direction to the inner layers from a N/2+1 layer to an N layer when the number of layers is even, or from a (N+1)/2 layer to an N layer when the number of layers is odd.

Abstract: A superconducting cable for alternating current, comprising conductor layers formed by a plurality of tape-shaped superconducting wires wound around a center member, an electric insulating layer formed outside the conductor layers, and a plurality of shielding layers formed outside the insulating layer, wherein