Connection structure of superconducting wire, method of connecting superconducting wire, and superconducting wire for connection

Abstract

By adopting the connection structure of the superconducting wire as follows, it is possible to suppress heat generation caused by current concentration in the portion where the third superconducting wire (13) is connected, reduce deterioration of the superconducting layer (3), and obtain stable superconducting performance : at the position where the ends of the first superconducting wire (11) and the second superconducting wire (12) are separated and arranged oppositely, along the length direction of the first superconducting wire (11) and the second superconducting wire (12), and in the A third superconducting wire (13) is connected across the first superconducting wire (11) and the second superconducting wire (12), and at least a part of the third superconducting wire (13) is larger than the first superconducting wire (11) and the second superconducting wire (11) The width of the superconducting wire (12) is narrow.

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 joining (for example, refer to Patent Documents 2 and 3); A t...

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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, current concentration occurs near the end of the superconducting wire 100 for connection (the portion surrounded by a dotted line in the figure) 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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