Superconductive magnet including a cryocooler coldhead

Details Superconductive magnet including a cryocooler coldhead Superconductive magnet including a cryocooler coldhead

2007-01-30

2007-01-30

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Superconductive type

C335S300000, C324S318000, C062S051100

Reexamination Certificate

active

10710682

ABSTRACT:
A zero boiloff cryogen cooled recondensing superconducting magnet assembly including superconducting magnet coils suitable for magnetic resonance imaging including a cryogen pressure vessel to contain a liquid cryogen reservoir to provide cryogenic temperatures to the magnet coils for superconducting operation; a vacuum vessel surrounding the pressure vessel and spaced therefrom; a first thermal shield surrounding and spaced from the pressure vessel; a second thermal shield surrounding and spaced from the first thermal shield and intermediate the vacuum vessel and the first shield; a cryocooler thermally connected by a first and a second thermal interface to the first and second thermal shields, respectively; a recondenser positioned in the space between the pressure vessel and the first thermal shield and thermally connected by a thermal interface to the cryocooler to recondense, back to liquid, cryogen gas provided from the pressure vessel; and means for returning the recondensed liquid cryogen the pressure vessel; wherein the second thermal shield surrounding the first thermal shield reduces a radiation heat load from the first thermal shield to the pressure vessel lowering boiloff of cryogen gas under conditions of failure or power off of the cryocooler.

REFERENCES:
patent: 4223540 (1980-09-01), Longsworth
patent: 4667487 (1987-05-01), Miller et al.
patent: 5132618 (1992-07-01), Sugimoto
patent: 5563566 (1996-10-01), Laskaris et al.
patent: 5936499 (1999-08-01), Eckels
patent: 6181228 (2001-01-01), Laskaris et al.
patent: 6708503 (2004-03-01), Wang et al.

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