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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 easy leakage and difficult to repair

Inactive Publication Date: 2010-04-14
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

[0032] A low-temperature superconducting component used for the cold end of high-temperature superconducting extra-large current leads 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 cover plate are made of copper plate and stainless steel The board is integrated by explosive welding, and there is a semicircular groove on the copper layer of the base and the cover; the cross-sectional area is 1×2.7mm 2 Rectangular niobium-titanium superconducting wire bundle 2, the number is 90, the spiral narrow side is wrapped around the copper rod 3, and the side wall of the copper rod 3 has a groove 4; the base of the rectangular niobium-titanium superconducting wire 2 and the joint box 1 is connected with The surface of the copper plate layer of the cover plate is hot-plated with Sn-40Pb solder in advance, and no flux remains, and then the rectangular niobium-titanium superconducting wire bundle 2 and the coppe...

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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 prove that 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 feeders for low-temperature superconducting magnets. Background technique: [0002] Thermonuclear fusion will be the way to completely solve the energy demand of mankind, and the International Thermonuclear Test Reactor (ITER) program will be implemented in the next ten years. The current leads feeding the large superconducting magnets are the most significant source of heat load. The use of high-temperature superconducting (HTS) current leads can save 2 / 3 of the cooling power consumption. In 2003 and 2004, Japan and Germany successively developed 60kA and 70kA HTS current leads for ITER magnets, which are comparable to conventional copper current leads in low temperature tests. pair. The Japan Atomic Energy Institute uses many niobium-titanium superconducting wires to connect the HTS components and copper current leads, and immerses them in liquid helium for cooling, which is purely an expedient metho...

Claims

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Application Information

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Patent Type & Authority Applications(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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