Distributions of dusts in the plasma column sheath

Dust crystal and void were simulated with a two-dimensional fluid model and a three-dimensional molecular dynamic model. The distributions of dust particles are obtained and these distributions are one-layer or two-layer dust crystals, conversely cone-shaped, and formulation of a cylindrical dust void without ion drag is complex. It is due to a gentle potential bump in the central region of the electrode caused by the cylindrical geometry. It can be concluded that it is the potential well of the central region of the electrode bottom established by lower ion density that contributes to the formation of dust voids.