Plasma propagation in emission channel of anodic electrode of plasma electron source

One studied plasma propagation in the extended channel of anodic electrode of electron plasma source based on glow discharge excited in pressure fore vacuum range. One measured the parameters of stationary plasma in the extended anodic channel for the case when thickness of bulk charge layer turned to be essentially smaller in contrast to the channel diameter. The obtained results show essential reduction of plasma concentration and of its potential as plasma penetrated in the channel. To describe the obtained results one introduces a physical model of plasma penetration based on the drift-diffusion motion of charged particles. The calculated dependences of axial distribution of concentration and potential of plasma are in good conformity with the experiment results