Reduction of sheath potential and dust ion-acoustic wave by negatively charged dust particles

Tomita, Yukihiro*; Smirnov, R.*; Chutov, Y.*; Takayama, Arimichi*; Takizuka, Tomonori

Formation of an electrostatic potential due to negatively charged dust particles near a target plate was studied by one-dimensional kinetic analysis. Immovable dust particles are distributed uniformly inside a system. It is clarified that the negatively charged dust particles reduce the ion-sheath drop. A threshold dust density makes the electric field at the target plate zero. The stationary oscillation appears in the electrostatic potential for the dust density above the threshold. We confirm that this oscillation is the Dust Ion-Acoustic Wave with a wave length of the order of Debye length, where dust charges are effective to determine the coefficient.