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...
In a cryostat wherein a first liquified gas is contained in a central vessel and said central vessel is surrounded by shielding means maintained at the temperature of another liquified gas of higher boiling point, said cryostat further comprising a containment vessel at ambient temperature, said containment vessel comprising a wall portion having an interior surface spaced from the outer surface of said shielding means, the improvement comprising: a radiation shield disposed between the interior surface of said containment vessel and the outer surface of...
이 특허를 인용한 특허 피인용횟수: 18
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