Abstract

A crucial measurement in the Astron device of the controlled thermonuclear research program is to monitor a small (10-G) transient magnetic field caused by a moving group of electrons. The Astron device involves high currents, large magnetic fields, radiation problems, and gigantic radio frequency (RF) noise. The evolution of a Hall device gaussmeter to directly measure this phenomenon is explained. The result is a simple device for the measurement of a small signal buried in noise of the combined form of large magnetic field, RF power, gamma radiation, and high dc currents.

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