Zero-evaporation superconducting magnet system capable of saving liquid helium

Abstract

The invention provides a zero-evaporation superconducting magnet system capable of saving liquid helium. A plurality of groups of superconducting coils are wound on a coil framework, and current is introduced through a current lead part at the upper end to generate a magnetic field; the helium container is in the shape of a cavity surrounding a superconducting coil cylinder. The superconducting coils and the coil framework are assembled in the helium container, the distance between the superconducting coils and the helium container is controlled, so that the liquid level height of a preset position can be reached by introducing a small amount of liquid helium into the helium container, the lower parts of the superconducting coils are cooled in a liquid helium soaking manner, and the unsoaked parts of the superconducting coils are cooled in a conduction manner; a liquid nitrogen precooling pipe is wound on the periphery of the helium container; two refrigerating machines are arranged above the magnet Dewar, and helium flows to the bottom of the helium container through a liquid helium inflow pipe after being liquefied by secondary cold heads of the refrigerating machines. Through a method of combining soaking cooling and conduction cooling, a small amount of liquid helium is used, and rapid cooling of the superconducting coil and zero-evaporation operation of the liquid helium are achieved.

Description

technical field [0001] The invention relates to the technical field of superconducting magnets, in particular to a superconducting magnet system cooled by liquid helium. Background technique [0002] A strong magnetic field changes the magnetic force distance between the nucleus and the electrons outside the nucleus, thereby changing the properties of the substance. Therefore, strong magnetic fields provide new research directions for basic science and interdisciplinary science. Compared with water-cooled magnets, the magnetic fields generated by superconducting magnets not only have low operating costs, high stability, but also more uniform magnetic fields. According to the characteristics of superconducting materials, cooling superconducting magnets to lower temperatures can obtain higher magnetic field strengths and gradients. [0003] Superconducting magnets cooled by refrigerators have the advantages of compact structure, convenient operation and good safety compared ...

AI Technical Summary

Problems solved by technology

However, the current superconducting magnets cooled by refrigerators have disadvantages such as large amount of cooling liquid, low cooling utilization rate, and slow cooling speed.

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