Cryostat for superconducting NMR spectrometer

Details Cryostat for superconducting NMR spectrometer Cryostat for superconducting NMR spectrometer

1978-02-21

1980-07-15

Capossela, Ronald C.

Refrigeration

Storage of solidified or liquified gas

62514R, 250261, F17C 702

Patent

active

042121698

ABSTRACT:
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 an 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 235.degree. K. by vapor cooling from the boil-off of escaping nitrogen and helium. A hermitically 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.

REFERENCES:
patent: 2643022 (1953-06-01), Cornell
patent: 3119238 (1964-01-01), Chamberlain et al.
patent: 3358468 (1967-12-01), Hawkins et al.
patent: 3364687 (1968-01-01), Kolm

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