High-temperature superconducting (HTS) devices and methods are disclosed. An HTS cable subassembly has a rectangular shaped cross section. The subassembly includes a stack of tapes formed of a superconducting material, and a cable subassembly wrapper wrapped around the stack of tapes. The tapes in the stack are slidably arranged in a parallel fashion. A cable assembly is formed of a cable assembly wrapper formed of a second non-superconducting material disposed around an nm array of cable subassemblies. Within a cable assembly, a first cable subassembly of the array of subassemblies is oriented substantially perpendicular to a second cable subassembly with regard to the plurality of tapes. A compound-cable assembly is formed by joining two or more cable assemblies. A high-temperature superconducting magnet is formed of a solenoidal magnet as well as dipole and quadrupole magnets wound of a cable subassembly, a cable assembly, and/or a compound cable assembly.

A superconductive conductor and method of using the superconductive conductor is described. The superconductive conductor includes a plurality of first conductive strips with a first width and a plurality of second conductive strips with a second width, and a strip stack formed from the first and second conductive strips that has a cruciform-shaped cross section.

A high temperature superconducting, HTS, tape. The HTS tape comprises a superconducting layer a superconducting layer formed from HTS material, a substrate, and one or more buffer layers separating the superconducting layer from the substrate. The HTS tape further comprises a plurality of holes extending at least through the superconducting layer and the one or more buffer layers and conductive material within each hole. The conductive material provides an electrical connection to the superconducting layer through the one or more buffer layers via the hole.

In a method of manufacturing an oxide superconducting wire, a superconducting laminated body is prepared, a tape-shaped stabilizer is folded to be divided into a first portion in which the stabilizer covers one surface of the superconducting laminated body in a thickness direction and a second portion in which the stabilizer covers both side surfaces of the superconducting laminated body in a widthwise direction and the stabilizer is disposed around the superconducting laminated body, the first portion is formed to have a width larger than that of the superconducting laminated body using a molding jig and the superconducting laminated body is covered with the stabilizer, and the superconducting laminated body and the stabilizer are bonded and a bonding material between the second portion and the superconducting laminated body is formed to have a thickness larger than that of a bonding material between the first portion and the superconducting laminated body.

A superconducting material includes YBa.sub.2Cu.sub.3O.sub.7- and a nano-structured, preferably nanowires, WO.sub.3 dopant in a range of from 0.01 to 3.0 wt. %, preferably 0.075 to 0.2 wt. %, based on total material weight. Methods of making the superconductor may preferably avoid solvents and pursue solid-state synthesis employing Y, Ba, and/or Cu oxides and/or carbonates.

A superconducting material includes YBa.sub.2Cu.sub.3O.sub.7- and a nano-structured, preferably nanowires, WO.sub.3 dopant in a range of from 0.01 to 3.0 wt. %, preferably 0.075 to 0.2 wt. %, based on total material weight. Methods of making the superconductor may preferably avoid solvents and pursue solid-state synthesis employing Y, Ba, and/or Cu oxides and/or carbonates.

Provided is a ReBCO-based high-temperature superconductor composition and a method of preparing the same comprising substituting a part of Gd with Ho, wherein the ReBCO-based high-temperature superconductor is represented by ReBa.sub.2Cu.sub.3O.sub.7-, in which Re comprises or consists of Gd and Ho. The superconductor may improve the critical current density without a change in the critical temperature.

A bundle of superconducting cables employs a plurality of superconducting cables, each having a former and a plurality of superconducting tape conductors wound in at least one layer around the former in a helical fashion. Each superconducting tape conductor has at least one superconducting layer. Each superconducting cable lacks an outer insulating layer and is held in a bundle of cables with each other superconducting cable of the plurality of superconducting cables. A sheath of non-conductive material covers the bundle of cables.

A superconducting material includes YBa.sub.2Cu.sub.3O.sub.7- and a nano-structured, preferably nanowires, WO.sub.3 dopant in a range of from 0.01 to 3.0 wt. %, preferably 0.075 to 0.2 wt. %, based on total material weight. Methods of making the superconductor may preferably avoid solvents and pursue solid-state synthesis employing Y, Ba, and/or Cu oxides and/or carbonates.

A superconducting wire rod connection structure can comprise first and second superconducting wire rods, wherein the first and second superconducting wire rods are formed by layering a base material, an intermediate layer, and a superconducting conductor layer. The base materials of the first and second superconducting wire rods can be joined to each other, and the superconducting conductor layers of the first and second superconducting wire rods can be connected by a connection wire rod including a superconducting conductor layer. Further, the superconducting wire rod connection structure can comprise a separating portion in which connection ends of the first and second superconducting wire rods with the base materials joined to each other are separated from the connection wire rod.