Abstract
The oscillator gauge is an electrostatic thermionic ionization gauge of very high sensitivity. Experiments are described for various collector and anode geometries in order to determine the nature of the electron trajectories. It is shown that under certain conditions the electrons can orbit around the anodes as well as oscillate between them. A gauge has been produced in which the oscillating mode is retained and the unwanted orbiting mode is suppressed. The gauge has a sensitivity greater than 10 4 torr −1. The ions are generated in a restricted beam and it should therefore have many advantages over existing ultra high vacuum gauges.
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