NMR magnet system with superconducting coil in a helium bath

Details NMR magnet system with superconducting coil in a helium bath NMR magnet system with superconducting coil in a helium bath

1991-12-09

1993-06-22

Capossela, Ronald C.

Refrigeration

Storage of solidified or liquified gas

Including cryostat

335216, 505892, F25B 1900

Patent

active

052208001

ABSTRACT:
In an NMR magnet system for generating a highly homogeneous magnetic field of high field strength, with at least one superconducting magnet coil which is arranged in a first chamber of a cryostat in supercooled liquid helium at a temperature of less than 4.2K, with the cryostat having at least one further chamber containing liquid helium that is essentially at atmospheric pressure with a temperature of approximately 4.2K, the first chamber is connected to the further chamber in such a way that the supercooled liquid helium located in the first chamber is also essentially at atmospheric pressure. A refrigerator with which the liquid helium can be cooled to a temperature T<<4.2K, especially to T.apprxeq.1.8-2.3K, is provided in the first chamber.

REFERENCES:
patent: 4689439 (1957-08-01), Sato
IEEE Transactions on Magnetics, vol. 24, No. 2, Mar. 1988 pp. 1063 to 1066 Turowski et al.
Rev. Sci. Instrum. 52(5), May 1981, pp. 649 to 656 Williams et al.: Magnet system of the 500 MHz spectrometer at the Francis Bitter national Laboratory: I. Design and development of the magnet.
German Book: Technische Physik in Einzeldarstellungen vol. 18 Springer-Verlag, Heidelberg, New York H. Brechna: Superconducting Magnet Systems, pp. 461, 462.

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