Forced flow cooling low-temperature section directly overlapped with high-temperature superconductor stack

Abstract

The invention discloses a forced flow cooling low-temperature section directly overlapped with a high-temperature superconductor stack in a high-temperature superconducting current lead. The forced flow cooling low-temperature section comprises the high-temperature superconductor stack, a cold-end copper structural part, a low-temperature superconducting wire, a copper core tube and a copper connector. The high-temperature superconductor stack is directly connected with the low-temperature superconducting wire in a soldering manner; the high-temperature superconductor stack and the low-temperature superconducting wire are sunk in trenches of a current divider and the cold-end copper structural part to be soldered into a whole; the low-temperature superconducting wire is spirally and tightly wound on the copper core tube prior to soldering; the copper connected is connected with the cold-end copper structural part in a threaded manner, and is provided with an internal cooling flow passage; small hole flow passages are distributed on the cold-end copper structural part and close to an outer circle array; and the low-temperature superconducting wire wound on the copper core tube is soldered with the copper connector. A bottom plane of the copper connector can be connected with a superconducting bus connector for welding. The high-temperature superconductor stack is directly connected with the low-temperature superconducting wire to reach -1n omega, 4.5K low-temperature heat load is just 3.7W, and cooling liquid helium flow resistance is just 0.02bar.

Description

technical field [0001] The invention relates to the field of power supply feeders for superconducting magnets of large-scale thermonuclear fusion devices or other large-scale electromagnetic devices, in particular to a forced-flow cooling low-temperature section used in high-temperature superconducting current leads that are directly overlapped with high-temperature superconducting stacks. Background technique [0002] Thermonuclear fusion will provide mankind with inexhaustible clean energy, and the International Thermonuclear Test Reactor (ITER) plan will be built in the next ten years. The high-temperature superconducting current lead supplies power to its giant low-temperature superconducting magnet, and is also the main source of heat load for the magnet. Using the high-temperature superconducting current lead can save 2 / 3 of the cooling power consumption. [0003] The low-temperature superconducting component is a part of the superconducting magnet power supply feeder...

AI Technical Summary

Problems solved by technology

[0004] At present, there is no very successful application of the method of directly welding the high-temperature superconducting stack and the low-temperature superconducting wire under the condition of forced flow cooling to obtain the minimum joint resistance, EAST 15kA The high-temperature superconducting current leads used to be soldered to connect the superconducting stack and the superconducting wire. At the same time, it was thought of as a vacuum seal. Improper operation can easily cause leakage and is difficult to repair.

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