Maxwell's equation div D= rho in one dimension is solved numerically, taking ionisation into account. Time independent anode sheath and double-layer solutions are obtained. By varying voltage, neutral gas pressure, temperature of the trapped ions on the cathode side and density and temperature of the trapped electrons on the anode side, diagrams are constructed that show permissible combinations of these parameters. Results from a recent experiment form a subset. Distribution functions, the Langmuir condition, some scaling laws and a possible application to the lower ionosphere are discussed.
This paper presents a method for the determination of the conductivity of dielectric materials under radiation environments typical of those found in the Van Allen belts. Particular significance is given to the effects of both temperature and dose rate and their effects on the conductivity of dielectrics. The beginnings of the study are presented here with electron irradiations of -1mm thick samples of FEP teflon and FR-4 epoxy glass. Irradiations were performed in the QinetiQ
Relativistic Electron Environment Facility (REEF)which utilises a p emitting source. Results for both materials clearly illustrate the expected dependence of charging rates on temperature. Using a model of internal charging and measurements of surface potential during charging, the dose rate and temperature dependences of conductivity were calculated for each material. Provisional results of these calculations are presented in this paper.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.