Abstract
On the practical superconducting wires, such as Nb–Ti alloy wires, Nb 3Sn compound wires, and bismuth system superconducting wires, the workability of long wire, transport critical current density, AC losses and mechanical properties were investigated. Practical superconducting wires of Nb–Ti alloy and Nb 3Sn compound have already been used as DC superconducting windings, and are expected to be used for AC applications. On the oxide superconducting wires, although bismuth 2223-phase wires have achieved workability of long wires up to about a kilometer and practical mechanical properties, yttrium system superconducting wires are still under development to enhance workability of long wire, AC losses and mechanical properties. The more effective trigger for practical superconducting wires might be something to project in the international scale.
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