High-temperature superconducting low-temperature helium self-circulation cooling system

Abstract

The invention discloses a high-temperature superconducting low-temperature helium self-circulation cooling system. Vertical temperature and density differences of low-temperature helium in the system allow natural convective circulation to form, and the problems that the superconducting magnet used in the direct cooling manner of a small refrigerator is poor in cooling effect and the necessary application of expensive low-temperature helium pumps in forced convective circulation cooling causes high cost are solved. After the system stabilizes, operating pressure is low; the safety problem is solved. A superconducting magnet and a current lead form a whole which can be lifted in or out of magnet mounting space and which is convenient to demount, mount and change; cooling medium helium has controllable temperature, and conditions for the study on performances of high-temperature superconducting magnets at specific temperature are provided.

Description

technical field [0001] The invention relates to the field of low-temperature systems for superconducting applications, in particular to a low-temperature helium self-circulating cooling system for high-temperature superconducting magnets. Background technique [0002] With the development of superconducting technology, superconducting magnets are widely used in scientific research and industry. At present, in large-scale applications such as high-energy accelerators, high-energy particle detectors, nuclear fusion devices, etc., the application of superconducting magnets has become more common, and in some applications superconducting magnets are almost the only choice. In some small and medium applications, superconducting magnets also have considerable development prospects. Superconducting magnetic pull single crystal growth furnaces, superconducting magnet separation devices, superconducting NMR imaging devices, etc. have made great progress. However, the realization of ...

AI Technical Summary

Problems solved by technology

In the past ten years, with the breakthrough of small refrigerator technology and the emergence of high-temperature superconducting materials, the technology of direct cooling of superconducting magnets by small refrigerators has been developed rapidly, but the cooling time of this cooling method is relatively long; the cooling effect is not uniform, and the There are special requirements for magnet winding; since there is no cold capacity reserve, when the refrigerator fails, the superconducting magnet will immediately heat up and cause quenching, and the stability of the magnet is poor; the disassembly and replacement of the magnet is cumbersome

3) Low-temperature helium forced convection circulation cooling, this cooling method has a good cooling effect, but the system is relatively complicated, and due to the large circulation flow and pressure, the safety is poor. In addition, forced convection requires a low-temperature helium pump. This kind of equipment is domestic Product reliability is poor, and the price of foreign products is relatively high

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