Helium recondensing magnetic resonance imager superconducting sh

Details Helium recondensing magnetic resonance imager superconducting sh Helium recondensing magnetic resonance imager superconducting sh

1998-05-07

2000-02-29

Doerrler, William

Refrigeration

Storage of solidified or liquified gas

With conservation of cryogen by reduction of vapor to liquid...

62 511, 335301, F17C 502, H01F 722, F25B 1900

Patent

active

060294582

ABSTRACT:
A cryogen recondensing magnetic resonance imager superconducting magnet utilizing a rare earth displacement material cryocooler with a superconducting sleeve surrounding a portion of the circumference of the cold end of the cryocooler to provide superconducting current flow of currents induced by movement of the rare earth displacer to generate opposing magnetic fields which shield the imaging region of the superconducting magnet from magnetic interference generated by movement of the cryocooler rare earth displacer.

REFERENCES:
patent: 5258573 (1993-11-01), Sugioka et al.
patent: 5373275 (1994-12-01), Itoh et al.
patent: 5447033 (1995-09-01), Nagao et al.
patent: 5613367 (1997-03-01), Chen
patent: 5701744 (1997-12-01), Eckels et al.

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