Abstract
AbstractFast electrons leaving a hollow cathode discharge axially through the orifice of a hole probe undergo ionizing collisions with the discharge gas in and behind the orifice. Ar++ ions produced in this way are used as a monitor for the density of fast electrons, Nef, on the axis of the negative glow of a cylindrical hollow cathode discharge. Data on Nef as dependent on the pressure of the Ar discharge gas and on the discharge current are obtained and an analytical expression for these dependences is found and discussed.
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