A Proton-Controlled Magnetic Field Regulator

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Abstract
A magnetic field discriminator is described which uses the nuclear induction signal from protons to give a ±75-volt change of d.c. voltage for a ±0.3-gauss change in magnetic field without using direct coupled amplifiers. An ordinary degenerative current regulator with the addition of information from the magnetic field discriminator will control a magnetic field to within 0.02 gauss for a 10 percent line voltage change or for normal changes in magnet geometry. The magnitude of the magnetic field is maintained in terms of a frequency, the value of which gives the absolute magnitude of the magnetic field.

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