Cold end of heavy current lead out wire made from high-temperature superconductor, and low resistance connector of superconducting transmission line

Abstract

The disclosed adaptor between cold junction of leading wire in heavy current of high-temperature superconductor and low resistance of superconducting transmission line includes structure: welding piles of high-temperature superconductor arranged in spaces to outer wall of support tube made from stainless steel in low thermal conductance; welding warm end in piles of high-temperature superconductor to transition piece of copper; through braze welding, cold end in piles is joined to NbTi/Cu superconducting line; cross winding NbTi/Cu line on inner copper tube sheathed inside outer copper tube; cooling superconducting line and copper connector by using liquid helium between inner and outer copper tubes. Features are: simple structure, suitable to connection under 20kA. In the invention, resistance of adaptor is lowered as 1.4-4.6n ohm. In supercritical quantity of helium flow 4g/s, all loss of 6 pieces of adaptor and 12 pieces of butt end of transmission line is less than 0.1Mpa.

Description

technical field [0001] The invention belongs to the high-temperature superconducting current lead wire feeding technology of a large superconducting magnet. Specifically, it is a low-resistance joint technology between the cold end of a high-temperature superconducting high-current lead wire and the end of a low-temperature superconducting transmission line. Background technique [0002] The development of engineering superconducting materials in the 1960s made it possible for superconducting technology to be applied to high-energy accelerators, nuclear fusion experimental devices and high-field magnets on a large scale. Compared with conventional magnets, superconducting magnet power supply costs and operating costs are greatly reduced, replaced by cryogenic system equipment costs and operating costs to maintain superconducting magnet operating conditions. The difficulty of 4K low-temperature refrigeration technology hinders the popularization and application of low-temper...

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Problems solved by technology

Therefore, it is different from CERN's Rutherford superconducting cable wound forced-current external cooling magnet and transmission line; Japan's JAERI's 60kA current lead does not consider the joint with the superconducting transmission line, and immersion cooling is not suitable for EAST; Germany's FZK's The 70kA current lead considers the joint technology with the superconducting transmission line, and adopts the mechanical clamping method. In order to reduce the joint resistance, the surface is plated with gold, and the copper parts are drilled with deep holes for buried welding Nb 3 Sn cable, difficult, complex process, high cost

The above-mentioned foreign high-temperature superconducting current leads did not provide specific design and manufacturing process details

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