Cryostat with external refrigerator for super-conducting NMR spectrometer
Patent
·
OSTI ID:5806113
An improved cryostat for the superconducting magnet of an NMR spectrometer comprises a nested structure of isothermal shells surrounding a thermally conductive central reservoir of substantially spherical shape containing liquid helium in which the superconducting solenoid remains operational when only partially immersed. A radiation shield surrounding the central reservoir is cooled by the boil-off of escaping helium vapor. The radiation shield is enclosed within a isothermal shell maintained at the temperature of liquid nitrogen by thermal contact with a liquid nitrogen reservoir disposed above the region of the central reservoir and shielded therefrom by a wall of the isothermal shell. An outer radiation shield surrounds the liquid nitrogen reservoir and associated isothermal shell and the outer radiation shield is maintained at a temperatures of the order of 180* K. By an external refrigeration facility. A hermitica sealed containment vessel forms the outer wall of the cryostat and provides a port for evacuating to a very low common pressure all the interior spaces between adjacent nested structures. The spacing between adjacent nested surfaces is maintained by a novel internal mechanical bracing system of low thermal conductivity comprising polyester cords disposed under tension between adjacent shells.
- Assignee:
- Varian Associates Inc
- Patent Number(s):
- US 4291541
- OSTI ID:
- 5806113
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONTROL EQUIPMENT
CRYOSTATS
DESIGN
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELEMENTS
EQUIPMENT
FLUIDS
GASES
HELIUM
HELIUM DILUTION REFRIGERATORS
LIQUIDS
MAGNETS
MEASURING INSTRUMENTS
NITROGEN
NMR SPECTROMETERS
NONMETALS
PHYSICAL PROPERTIES
RADIATION PROTECTION
RARE GASES
REFRIGERATORS
SHELLS
SHIELDS
SOLENOIDS
SPECTROMETERS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
THERMOSTATS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONTROL EQUIPMENT
CRYOSTATS
DESIGN
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELEMENTS
EQUIPMENT
FLUIDS
GASES
HELIUM
HELIUM DILUTION REFRIGERATORS
LIQUIDS
MAGNETS
MEASURING INSTRUMENTS
NITROGEN
NMR SPECTROMETERS
NONMETALS
PHYSICAL PROPERTIES
RADIATION PROTECTION
RARE GASES
REFRIGERATORS
SHELLS
SHIELDS
SOLENOIDS
SPECTROMETERS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
THERMOSTATS