V-Shaped Potential Distribution with a Virtual Cathode Generated by an Electron Beam Injection

Abstract

Spatial distributions of the potential and space charge density with a virtual cathode are described both experimentally and theoretically. A V-shaped potential profile is formed by injecting an electron beam which provides an ionization on the high potential region. The analys is with applying water bag energy distribution functions of beam and ionized electrons and with integrating Poisson equation is found to fully account for the experimental results.