Vibration reduction type cold head container for superconducting magnet

Abstract

The invention discloses a vibration reduction type cold head container for a superconducting magnet. The container is characterized by comprising a cold head container upper flange (21), a cold head container lower flange (22), a corrugated pipe (13), a primary stainless steel thin-wall pipe (14), a cold head container primary heat-conducting flange (15), a secondary stainless steel thin-wall pipe (18), a magnetic shielding cylinder (16), a bottom connecting corrugated pipe (20) and the like, wherein the vibration reduction corrugated pipe (13) is arranged between the cold head container upper flange (21) and the cold head container lower flange (22); the upper part of the primary stainless steel thin-wall pipe (14) is connected with the cold head container upper flange (21) in an argon arc welding manner, and the lower part of the primary stainless steel thin-wall pipe (14) is connected with the cold head container primary heat-conducting flange (15) in a vacuum brazing manner; the lower part of the cold head container primary heat-conducting flange (15) is connected with the secondary stainless steel thin-wall pipe (18); the bottom of the secondary stainless steel thin-wall pipe (18) is provided with the corrugated pipe (20); the magnetic shielding cylinder (16) is sleeved outside the secondary stainless steel thin-wall pipe (18); and a GM (Gifford-Mcmahon) refrigerator (6) or a pulse tube refrigerator (7) is arranged in the cold head container (1).

Description

technical field [0001] The invention relates to a cold head container for a superconducting magnet, in particular to a shock-absorbing cold head container for a superconducting magnet used in liquid helium zero-volatility superconducting magnetic resonance imaging and magnetic resonance spectrometer superconducting magnets. Background technique [0002] At present, the overall nuclear magnetic resonance imaging system can apply a special variable magnetic field to a certain part of the human body according to the characteristics of the micro-magnetism of the nucleus of the cell, and then observe the state changes of a certain atom in the magnetic field, supplemented by computer image analysis technology. Information on human tissue can be obtained to help determine the location of the lesion. The application of superconducting magnets in medicine has achieved significant results. Compared with the well-known permanent magnets and electromagnets, superconducting magnets hav...

AI Technical Summary

Problems solved by technology

However, the movement of the piston in the GM refrigerator will generate vibration, and the vibration will be transmitted to the entire magnet through the connecting devices, which will affect the uniformity of the magnetic field

thereby affecting the scanned image quality

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