High-temperature superconducting magnet liquid nitrogen zero-evaporation cooling system

Abstract

The invention discloses a high-temperature superconducting magnet liquid nitrogen zero-evaporation cooling system. Liquid nitrogen is selected to be used as cooling media, a thermosyphon principle is utilized, and in addition, a superconducting magnet is cooled in a way of forming a refrigerating machine installing dewar, a magnet cooling dewar, a liquid nitrogen communication pipeline and an evaporation nitrogen gas communication pipeline into a sealed circulation system. The high-temperature superconducting magnet liquid nitrogen zero-evaporation cooling system solves the problems that in the liquid nitrogen direct soaking cooling mode, liquid nitrogen needs to be regularly supplemented, in the large-cooling-capacity direct cooling mode, the superconducting magnet cooling effect is poor, in the forced convection circulation cooling, a high-price low-temperature nitrogen pump needs to be adopted, and the cost is high. The temperature of cooling media of liquid nitrogen is controllable, conditions are provided for studying the performance of high-temperature superconducting magnets at the specific temperature. The system has the advantages that the refrigerating machine and the superconducting magnet are placed in a separated way, the damage to the refrigerating machine caused by superconducting magnet superconducting loss is avoided, and the safety is improved. The superconducting magnet and a current lead wire form a whole body which can be directly hung out from or hung into the magnet cooling dewar, and the dismounting, the mounting and the replacement are convenient.

Description

technical field [0001] The invention relates to the field of low-temperature technology for superconducting applications, in particular to a liquid nitrogen zero-evaporation 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 supe...

AI Technical Summary

Problems solved by technology

2) Superconducting magnets are cooled by forced convection with supercooled liquid nitrogen. This cooling method has a good cooling effect, but the system is relatively complex and has poor reliability. Due to the large circulation flow and pressure, the safety is poor. In addition, forced convection requires cryogenic liquid Nitrogen pump, the reliability of domestic products of this kind of equipment is poor, and the price of foreign products is relatively high

Although the temperature of liquid nitrogen can be lower than 77K, it is still impossible to control the temperature of liquid nitrogen more accurately, so that it is impossible to provide experimental conditions for studying the performance of superconducting magnets at specific temperatures

3) Large-capacity low-temperature refrigerator conduction cooling superconducting magnets, this cooling method generally takes a long time to cool, the cooling effect is uneven, and has special requirements for magnet winding; because there is no cold reserve, when the refrigerator fails, the superconducting The magnet will heat up immediately, resulting in quenching, and the stability of the magnet is poor; the operation of disassembling and replacing the magnet is cumbersome

Images