The Rotation of Complex Plasmas in a Stratified Glow Discharge in the Strong Magnetic Field

Abstract

The dusty plasma was created in a glow discharge in a magnetic field with induction up to 10 000 G. The setup and dc discharge conditions for this unique experiment are described. Dusty plasma exists in the form of volumetric dust structures or dust clusters rotating in the magnetic field. Quantitative results are presented in the form of dependence of an angular velocity of rotation on the magnetic induction. The rotational dynamics of a dusty plasma found experimentally is complex. It has a rotation inversion, a sharp change in the growth rate, and an instability region in which a partial loss of the dust component occurs. In the case where it is possible, the quality interpretation for the obtained dependence is given. The regions of the magnetic field are found in which the ion drag force dominates, the region where the dust structure is entrained by the moving gas of the discharge, and the region of slow growth of the rotation speed, which has not yet been uniquely interpreted.