Simulation of DC high-voltage breakdown for angled dielectric insulators including space- and surface-charging effects

This work reports on 2D Particle-In-Cell simulations of DC multipactor breakdown initiated near a presumed triple-point current source. Models for space charge and dielectric charging are included. Common simulation parameters are dielectric insulator angle, gap width, and applied voltage. Breakdown voltage as a function of angle is presented for a presumed triple-point current source. Initial considerations for a self-consistent Fowler-Nordheim current source are discussed. Breakdown in initial experiments was not observed and some possible reasons for this are considered. Current status and plans are outlined.