Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1992-03-27
1994-01-18
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
335216, G01R 3320
Patent
active
052802477
ABSTRACT:
An examination region (12) is defined within the bore of a superconducting magnet assembly (10). An RF coil (22) and gradient magnetic field coils (14) are disposed within the bore of the superconducting magnetic assembly around the examination region. The superconducting magnet includes a hollow, tubular vacuum vessel (40) which contains a plurality of annular superconducting magnets (58). These superconducting magnets are held in a liquid helium holding reservoir (60) such that they are held below their superconducting temperature. A first cold shield (44) and a second cold shield (50 ) have tubular portions between the superconducting magnets and the examination region. These cylindrical portions each include a cylinder (70) of a electrically insulating material such as reinforced plastic. Thermally conductive layers (72) are defined on each surface and are divided by etched slots or resistance portions (74) into a multiplicity of elongated narrow segments (92). The narrow segments are constructed of a thermally conductive material, such as copper or aluminum, that also happens to be electrically conductive. The division of the foil layer into a multiplicity of segments divides the generated eddy currents into a like multiplicity of substantially canceling eddy currents (82) increasing the eddy current path length, increasing the total electrical resistance encountered, and reducing the amplitude and time constant of the resultant net eddy current and eddy magnetic field.
REFERENCES:
patent: 4833433 (1989-05-01), Schmettow et al.
patent: 4851958 (1989-07-01), Takechi
patent: 4868707 (1989-09-01), Takechi
patent: 4978920 (1990-12-01), Mansfield et al.
patent: 5045826 (1991-09-01), Laskaris
patent: 5198769 (1993-03-01), Frese et al.
DeMeester Gordon D.
Morich Michael A.
Patrick John L.
Picker International Inc.
Tokar Michael J.
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