Observation of sheath modification in laboratory dusty plasma

The nature of the electrostatic sheath near a plasma boundary is experimentally investigated in the presence of charged dust grains. The experiment is performed in a dusty double plasma device. The dusty plasma parameters are measured and the influence of dust density on the dust charging process has been presented. The average charge on a dust grain is found to decrease when dust density in the plasma volume is increased. The negatively charged dust particles are found to modify the sheath parameter and bulk plasma parameters. The influence of different dust density as well as of the negative bias to the metallic plate on the ion sheath structure is presented.