Dust particles influence on a stratified glow discharge

In this work, the correlations between the parameters of a DC glow discharge and dust particles in a lowtemperature plasma have been studied. The formation of voids inside the dust cloud was studied, depending on the characteristics of the discharge (the discharge pressure, type of gas and discharge current) and dust particles (their quantity and size). We have demonstrated that the ion drag force could lead to the formation of voids in the center of the cloud of dust grains, which levitate in the field of a stratified positive column. It has also been demonstrated that the accumulation of dust particles affects the discharge plasma in a non-local way, i.e., the density distribution of dust grains and the charge of each individual particle depend on the plasma parameters outside the dust cloud. The presented qualitative estimates are important for understanding the processes occurring in complex plasma of a glow discharge.