Apparatus for nuclear spin tomography having superconducting bas

Details Apparatus for nuclear spin tomography having superconducting bas Apparatus for nuclear spin tomography having superconducting bas

1988-05-12

1989-10-24

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

505850, 324319, G01R 3320

Patent

active

048765104

ABSTRACT:
Magnet coil system for nuclear spin tomography has superconducting coils for generating a homogeneous magnetic base field and nonsuperconducting coils within an interior region defined by the base field coils for developing magnetic field gradients. At least one cooled radiation shield of electrically and thermally conductive material is arranged between the gradient coils and the superconducting base field coils. To prevent eddy currents started in the radiation shield from distorting the gradient fields, the radiation field contains superconducting material of a "second kind" that is a high temperature superconductor. The superconductor is in a nonsuperconducting state at the start of an excitation process for the base field coils and in a superconducting state during the undisturbed operation of the magnet coil system.

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Journal of the American Chemical Society, vol. 109, No. 9 (1987) pp. 2848-2849.
Applies Physics Letters, vol. 51, No. 11 (Sep. 14, 1987) pp. 852-854.

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