Effect of neutral gas motion on the rotation of dust clusters in an axial magnetic field

被引：77

作者：

Carstensen, Jan ^{[1
]}

Greiner, Franko ^{[1
]}

Hou, Lu-Jing ^{[1
]}

Maurer, Horst ^{[1
]}

Piel, Alexander ^{[1
]}

机构：

[1] Univ Kiel, IEAP, D-24098 Kiel, Germany

来源：

PHYSICS OF PLASMAS | 2009年 / 16卷 / 01期

关键词：

dusty plasmas; hydrodynamics; plasma collision processes; plasma flow; plasma sheaths; COULOMB CLUSTERS; PLASMA STRUCTURES; GLOW-DISCHARGE; PARTICLES;

D O I：

10.1063/1.3063059

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Experiments are carried out to investigate the rotation of dust clusters in a radio-frequency plasma sheath with a vertical magnetic field. Our observations are in disagreement with the standard model, in which it was assumed that the neutral gas is at rest and that a steady rotation is attained when the ion-drag force is balanced by neutral friction. Here, we re-examine this basic assumption by carefully designed experiments. Our results suggest that the neutral gas is set into rotation by ExB induced ion flow through ion-neutral collisions and that the dust particles are advected by this flow. A hydrodynamic model is proposed to describe the rotation of the neutral gas and it can explain our observations.

引用

页数：8

共 22 条

[1] Direct observation of microparticle gyromotion in a magnetized direct current glow discharge dusty plasma [J].