Large high-temperature superconducting magnet system based on small refrigerating machine and temperature control method

Abstract

The invention discloses a large high-temperature superconducting magnet system based on a small refrigerating machine and a temperature control method. The high-temperature superconducting magnet system comprises a thermostat, a GM refrigerating machine, a helium refrigerating loop, a liquid nitrogen pre-cooling loop, a nitrogen fixation space and a superconducting coil assembly. The nitrogen fixation space is based on mixed gas of helium and nitrogen, and the cooling effect of the high-temperature superconducting coil assembly is optimized by utilizing the substance states of the mixed gas at different temperatures; the liquid nitrogen pre-cooling loop comprises a liquid nitrogen pre-cooling heat exchanger helium pipeline and a liquid nitrogen pre-cooling heat exchanger liquid nitrogen pipeline. The invention further discloses a method which comprises the steps that the helium refrigerating loop circulating pump is started, the helium system starts to circulate, and the superconducting coil assembly starts to cool; a liquid nitrogen pre-cooling temperature reduction working condition happens; and a quenching working condition hppens. The refrigerating machine, the helium refrigerating loop and the liquid nitrogen pre-cooling loop are organically combined, and the rapid cooling effect of the small refrigerating machine on the large high-temperature superconducting magnet system is achieved.

Description

technical field [0001] The invention belongs to the technical field of superconducting cyclotrons, and in particular relates to a large-scale high-temperature superconducting magnet system based on a small refrigerator and a temperature control method. Background technique [0002] The cooling method of the high temperature superconducting magnet is improved on the cooling method of the low temperature superconducting magnet. [0003] One of the cooling methods of traditional small-scale low-temperature superconducting magnet structure is to use liquid helium for immersion cooling. The immersion cooling method of the high-temperature superconducting magnet is improved on this basis. After the improvement, the immersion cooling of the high-temperature superconducting magnet is divided into two stages. , (liquid nitrogen can only be cooled to 77K, and the cooling cannot be continued below), the second stage is cooled from 77K to 30K, and the cooling in this stage is cooled by...

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Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention proposes a large-scale high-temperature superconducting magnet system and a temperature control method based on a small refrigerator, the purpose of which is to solve the prior art high-temperature superconducting magnet system. The semi-manual and semi-automatic cooling method increases the workload; if the conduction belt conduction cooling method of the refrigerator is adopted, there will be a problem of uneven conduction for the large-scale high-temperature superconducting magnet system; Superconducting magnet system, if a small refrigerator is used, the cooling cycle is too long

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