F - Mech Eng,Light,Heat,Weapons – 17 – C
Patent
F - Mech Eng,Light,Heat,Weapons
17
C
162/21
F17C 1/00 (2006.01)
Patent
CA 1107633
PATENT APPLICATION of GEORGE D. KNEIP, JR. AND MARVIN H. ANDERSON for IMPROVED CRYOSTAT WITH EXTERNAL REFRIGERATOR FOR SUPERCONDUCTING NMR SPECTROMETER Abstract of Disclosure 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 180°K by an external refrigeration facility. 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. 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. -i-
362712
Anderson Marvin H.
Kneip George D. Jr.
R. William Wray & Associates
Varian Associates Inc.
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