Space-charge dispersive transport in corona-charged dielectrics

A model of radiation-induced space-charge kinetics in non-crystalline dielectrics during continuous irradiation with charged particles of range much smaller than the thickness of the sample is developed. The dispersive transport of space charge is considered using the multiple-trapping model with exponential energy spectrum of localized states. Open-circuit conditions are analyzed with rear electrode grounded. Analytical solutions for time-dependent spatial distributions of space-charge density and electric field strength are obtained. It is shown that the voltage across the sample increases as a sublinear function of irradiation time.