Abstract
An orbitron type ionization gauge has been constructed which is based on the original idea of Gabor 1 for an electro-static ion pump. Electrons are injected into the radial electro-static field from a simple electron gun. It is shown that the ion current varies smoothly with changes of voltage on the gun anode, and does not exhibit any instabilities which are frequently reported with the orbitron. Gauge sensitivities in the region of 104 torr−1 have been obtained for voltages of 500 V on the central anode. Resistance paper analogue techniques have been used to show the field distortion produced at the outer collector by the external gun. A rubber model analogue has also been constructed to simulate the electron trajectories and has shown that certain orientations of the gun and gun apertures of small diameter, are necessary for high gauge sensitivities.
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