Method for homogenizing the field of a magnetic coil and apparat

Details Method for homogenizing the field of a magnetic coil and apparat Method for homogenizing the field of a magnetic coil and apparat

1986-03-24

1987-07-28

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01R 3320

Patent

active

046834346

ABSTRACT:
A method and apparatus are proposed for homogenizing the field of a primary magnetic coil which can be energized from a primary current source and operated in a superconductive manner and short-circuited by means of superconducting switches. A profile of the uncorrected field of the primary coil is measured along an axis of the coil, and parameters for compensating fields are determined from the profile, with the compensating fields then being superimposed on the uncorrected field. In order to avoid the necessity of having to re-heat and then cool the primary coil for attachment of correcting windings for the compensating fields, the invention calls for separately energizable supplementary coils to be brought to a low temperature together with the primary coil, the field profile of the primary coil to be measured, the corresponding field gradients to be determined therefrom, and correcting currents for each individual supplementary coil to be determined therefrom and set, with the superconducting switches of the supplementary coils then being made.

REFERENCES:
patent: 4173775 (1979-11-01), Kneip, Jr.
patent: 4300096 (1981-11-01), Harrison et al.
patent: 4623844 (1986-11-01), Macovski
"Measurement and Control of Magnetic Field Homogeneity", The Review of Scientific Instruments, vol. 39, No. 7, Jul. 1968.

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