Superconducting wire connection structure, superconducting wire connection method, and superconducting wire for connecting

Abstract

A superconducting wire connection structure is adopted in which, in a section where the ends of a first superconducting wire (11) and a second superconducting wire (12) are spaced apart from and arranged across from each other, the third superconducting wire (13), which is narrower in at least one portion than the first superconducting wire (11) and the second superconducting wire (12), spans and connects the first superconducting wire (11) and the second superconducting wire (12) along the longitudinal direction of the first superconducting wire (11) and second superconducting wire (12). Thereby, it is possible to reduce degradation of the superconducting layer (3) by suppressing generation of heat caused by current flow concentration at the section where the third superconducting wire (13) is connected, and stable superconducting performance can be achieved.

Description

technical field [0001] The present invention relates to a connection structure of a superconducting wire, a method for connecting a superconducting wire, and a superconducting wire for connection. Background technique [0002] In the past, such as Figure 8A , Figure 8B , Figure 8C As shown, when connecting the superconducting wires, the superconducting wires 100 that have been cut short for connection are bonded by welding or spot welding to the portions where the ends of the superconducting wires 10 abut against each other, and then electrically connected. [0003] For example, in Patent Document 1 (refer to Patent Document 1 image 3 ) also discloses the connection structure as described above. [0004] In addition, the following techniques are known: a technique of depositing a superconducting thin film on the portion where the ends of superconducting wires butt against each other by vapor deposition and bonding (see, for example, Patent Documents 2 and 3); A techn...

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Problems solved by technology

[0012] However, in the case of the connection structure of the above-mentioned prior art and Patent Document 1, there are problems as follows: Figure 8B , Figure 8C As shown, in the vicinity of the end of the superconducting wire 100 for connection (the portion surrounded by a dotted line in the figure), current concentration occurs due to the skin effect, and the current density increases to cause heat generation, and the superconducting of the superconducting wire is caused by the heat. Layer deterioration, making the superconducting performance decline

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