Liquid-helium-free animal imaging superconducting magnet

Abstract

The invention provides a liquid-helium-free animal imaging superconducting magnet. The liquid-helium-free animal imaging superconducting magnet comprises a superconducting magnet, a liquid-helium-free low-temperature system and a pull rod. The superconducting magnet comprises a main magnet, a shielding magnet and a 4K container, the main coil is wound in an external wire slot of the main framework to form the main magnet, the shielding coil is wound in an external wire slot of the shielding framework to form the shielding magnet, and the 4K container contains the superconducting magnet; the liquid-helium-free low-temperature system comprises a refrigerating machine, a refrigerating machine primary cold head, a cold shield, a refrigerating machine secondary cold head, a cold conduction ring, a cold conduction belt and a Dewar container, the refrigerating machine primary cold head is directly connected with the cold shield to achieve primary refrigeration, the refrigerating machine secondary cold head is directly connected with the cold conduction ring, and the cold conduction ring is connected with the shielding coil and the main coil through the cold conduction belt. Secondary refrigeration of the superconducting magnet is achieved, and the Dewar container is used for forming a low-temperature system vacuum environment; the superconducting magnet and the cold shield are suspended and fixed in the Dewar container through a pull rod to reduce system contact heat leakage; the diameter of the inner hole of the superconducting magnet is suitable for small animal imaging.

Description

technical field [0001] The invention belongs to the technical field of superconducting magnets, and relates to a liquid helium-free animal imaging superconducting magnet. Background technique [0002] Superconducting magnets are widely used in the development of medical diagnosis and scientific instruments, among which superconducting MRI equipment has become one of the most popular clinical diagnostic equipment in the world, but the stable operation of superconducting MRI equipment needs to be kept in a low temperature environment, traditional The refrigeration method is liquid helium refrigeration, which requires a large amount of liquid helium material for long-term use, and the cost is relatively high. [0003] In recent years, with the continuous development of new materials and low-temperature technology, the cooling power of the refrigerator is small, which can achieve low energy consumption at a temperature of 4.2K, and the daily operation and maintenance cost is low...

AI Technical Summary

Problems solved by technology

Using a refrigerator to cool the superconducting magnet can avoid the use of liquid helium. In a general superconducting magnet, the secondary cold head of the refrigerator directly cools both ends of the magnet through the cold guide plate, but for a slightly larger magnet Generally speaking, it is easy to cause the problem of uneven temperature of the magnet, thereby affecting the uniformity of the magnetic field, and it is necessary to optimize the temperature distribution of the secondary refrigeration

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