Cryogenic magnet systems
AssigneeElscint Ltd.
InventorZvi Kamil
Life of this patent
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Abstract
Improved cryogenic magnet systems for use in NMR imaging devices comprising an electro-magnet immersed in a first tank containing a first liquid gas, the first tank located in a container evacuated to a high vacuum, a refrigerating system external to said container, and coupling means for coupling a cold head of the refrigerating system to radiation shielding means surrounding said first tank for lowering the temperature of the shielding means to thereby reduce boil-off of said liquid gas.
Claims14
An improved cryogenic superconductive magnet system for use in nuclear magnetic resonance (NMR) devices, said system comprising:
- (a) a cryogenic superconducting electro-magnet immersed in a first tank containing a first liquified gas;
- (b) said first tank being mounted in a vacuum container;
- (c) heat radiation shielding means surrounding said first tank in said vacuum container;
- (d) a refrigerator system external to said vacuum container, said refrigerator system including refrigerant means, and means for compressing said refrigerant means;
- (e) coupling means comprising cold head means for carrying said compressed refrigerant means to said heat radiation shielding means to remove heat from said heat radiation shielding means;
- and
- (f) said cold head means comprising heat transferrable mesh means attached to said cold head means to be between said cold head means and said heat shielding means and in contact with said heat shielding means for increasing the area of direct contiguity between said cold head means and said heat shielding means.
An improved cryogenic system providing a cold environment for superconducting magnets for use in NMR devices, said system comprising:
- (a) an electro-magnet immersed in a first tank containing a first liquified gas, the boil off of said liquified gas used for maintaining low temperatures required for superconducting electro-magnets;
- (b) said first tank being mounted in a vacuum container;
- (c) heat radiation shielding means in said vacuum container surrounding said first tank;
- (d) a refrigerator system external to said vacuum container;
- (e) coupling means for coupling a cold head of said external refrigerator system to said shielding means for lowering the temperature of said heat radiation shielding means to reduce boil off of the first liquified gas;
- and
- (f) means for utilizing the magnet force of the magnet of the NMR system to assure abutment between the cold head and the heat radiation shielding means.
Dependencies are inferred from the claim text.