Dust on a surface in a plasma: A charge simulation

Abstract

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Triboelectric and plasma charging of microparticles

“…4b). We have shown earlier that a plasma will cause particles on a surface to charge towards a certain equilibrium charge [9]. In the present experiments the equilibrium charge is smaller than the initial charge, and the particle charge is seen to reduce.…”

“…We have attempted it numerically in [9] for a single insulated particle on a flat surface. Its equilibrium charge was determined by balancing the ion and electron fluxes.…”

“…The black solid line (bottom axes) is a charge estimate for single insulating particle (with bulk electron density of 2 and 5 · 10 15 m −3 for respectively the right and left line) [9]. The dashed black line (top axes) is an estimate for conducting particles [15].…”

“…They, however, used a hot filament to create the plasma, which is known to cause hot electrons and therefore possibly a higher equilibrium charge [9].…”

“…Generally the bodies will get a negative charge to repel part of the electrons, that are much lighter, and therefore faster than the ions. Also particles on a surface in contact with a plasma will generally charge negative [9].…”