Study of sheath properties in collisional dusty plasma with nonthermal electrons and ionization

Abstract

The characteristic behaviors of the sheath in a collisional dusty plasma composed of nonthermal electrons, ions, neutral atoms, and negatively charged dusts are investigated. To suit the realistic environment, the ionization effect is considered. The result reveals that the peculiarities of the sheath relied on ionization frequency σ, non-thermality parameter b, and dust grains concentration μ. At the sheath edge, the requirement of ion-entering-sheath-velocity enhances with increased b and μ, conversely, reduces with the increment of σ. Nevertheless, when the ionization is pronounced, the impact of b on the Bohm velocity is almost negligible. In the sheath, the increased σ leads to the reduction of the sheath thickness, which results in the redistribution of particles densities. It is noted that ion accumulation is present near the sheath edge. As expected, the present results can give more insight into the interaction processes that happened in the plasma–wall transition region.