Potential of an Insulating Disk Irradiated by an Electron Beam

Thin insulating films on satellites are known to charge to kilovolt potentials in space due to irradiation by charged particles. The electrostatic fields which develop on their surface are shown to be governed by emission limited charging. It is unnecessary to consider surface or bulk conductivity to explain the charging of the two-dimensional surfaces except, perhaps, extremely close to the edge of the dielectric.