We present results of a calculation of current-voltage characteristic curves and voltage profiles for an idealized spacecraft charging configuration. We model a plasma interacting with a conducting disk covered by a charged dielectric, with a portion of the conductor exposed to the ambient magnetospheric plasma. We also model the electrostatics of a conducting "button" resting on the center of a dielectric disk. The calculation uses a cylindrical particle-in-cell (PIC) particle mover with variable particle number, and the potential is calculated self-consistently using successive over relaxation (SOR). Results of this electrostatic plasma simulation are presented both with and without secondary electron emission from the dielectric. FIG. 7. Potential function for a -200-Y button run, after SOOO time steps.Chaky, Nonnast, and Enoch 7095 [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 132.174.254.155 On: Tue

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