Abstract
ABSTRACT Measurements have been made of the plasma electron concentration (n) along and perpendicular to the axis of a low pressure, low voltage oscillating discharge with cylindrical symmetry, maintained by an axially directed beam from a small cathode. The contours of n are sharply peaked radially at the axis between the cathode and oscillation front (meniscus), but are much flatter beyond the meniscus, near the anode. The radial contours between cathode and meniscus conform approximately to those predicted theoretically for axial electron generation, and those near the anode to those predicted theoretically for ion generation proportional to electron concentration. Contours near the meniscus, when not completely unobtainable on account of the oscillations, exhibit apparent radial maxima and minima associated with the beam diverging from the meniscus.
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