Low temperature superconducting assembly with low joint resistance for high temperature superconducting current lead cold end

A current lead, low temperature superconducting technology, applied in superconducting magnets/coils, electrical components, connecting contact materials, etc., can solve problems such as difficult to repair and easy to leak

Inactive Publication Date: 2011-05-25
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Leaks easily if done incorrectly and is difficult to repair

Method used

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  • Low temperature superconducting assembly with low joint resistance for high temperature superconducting current lead cold end
  • Low temperature superconducting assembly with low joint resistance for high temperature superconducting current lead cold end
  • Low temperature superconducting assembly with low joint resistance for high temperature superconducting current lead cold end

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Embodiment Construction

[0033] A low temperature superconducting assembly used for the cold end of high temperature superconducting extra-large current lead wire and low joint resistance, specifically a joint box 1, the joint box 1 is composed of a base and a cover plate, and the base and the cover plate are made of copper plate and stainless steel. The plate is integrated by explosion welding, and there are semicircular grooves on the copper plate layer of the base and the cover plate; the cross-sectional area is 1×2.7mm 2 The rectangular niobium-titanium superconducting wire bundle 2 is 90 in number, and the helical narrow side is wrapped around the copper rod 3, and the side wall of the copper rod 3 is provided with a slot 4; the base of the rectangular niobium-titanium superconducting wire 2 and the joint box 1 is The surface of the copper plate layer of the cover plate is hot-dipped with Sn-40Pb solder in advance, and no flux remains, and then the rectangular niobium-titanium superconducting wire...

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Abstract

The invention discloses a low temperature superconducting assembly with low joint resistance for a high temperature superconducting current lead cold end. The resistance of a 40-70kA high temperature superconducting super current lead of which the lower end is connected with a low temperature superconducting bus must be as low as 1 nano-ohm. A rectangular section niobium-titanium / copper superconducting wire or a high conductivity copper material and a paired box type joint structure connected with the superconducting bus are adopted in the low temperature superconducting assembly. Tests provethat the joint resistance of the low temperature superconducting assembly and a high temperature superconducting assembly can be as low as 0.5 nano-ohm, and the joint resistance of the superconducting bus is lower than 1 nano-ohm. The low temperature superconducting assembly is a middle result for developing super current leads of an international thermonuclear fusion test reactor and has the characteristics of novel conception and low manufacturing cost.

Description

Technical field: [0001] The invention belongs to the technical field of feeder lines of low temperature superconducting magnets. Background technique: [0002] Thermonuclear fusion will be the way to completely solve the energy needs of mankind, and the International Thermonuclear Experimental Reactor (ITER) program will be implemented in the next ten years. The current leads feeding large superconducting magnets are the most significant source of thermal load. The use of high temperature superconducting (HTS) current leads can save 2 / 3 of the power consumption of refrigeration. In 2003 and 2004, Japan and Germany successively developed 60kA and 70kA HTS current leads for ITER magnets, which were the same as conventional copper current leads in low temperature tests. pair. The Japan Atomic Energy Institute used many niobium-titanium superconducting wires to connect HTS components and copper current leads, and immersed in liquid helium for cooling, which was purely an exped...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R4/68H01F6/06
Inventor 毕延芳黄雄一沈光
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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