A Simple Ion Gun

Abstract
A simple electron bombardment ion gun based on a Bayard-Alpert ion gauge is described. The gun produces a total beam current of about 1 μA of Ar+ with a current density of 1 to 5 μA/cm2 and a diameter of about 1 cm, at an argon pressure of 5×10−6 Torr. The energy half-width of the beam is about 10 eV for ion energies between 500 and 1500 eV. The source is suitable for the production of ions from any gas.

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