The Dynamics of Dust Structures under Magnetic Field in Stratified Glow Discharge

Abstract

A detailed research of mechanisms causing the rotation of dust structures formed in striations of the glow discharge in longitudinal magnetic field is presented. Literary data speak about sign‐variable dependence of angular velocity of dust structure on the magnetic field. The first done experiment proves that ion drag force is the reason of rotation with the negative projection of angular velocity on magnetic induction in small magnetic fields. The method of a variation of an ion flux in mixes of gases was used for the research. In the second experiment the gas rotation arising because of eddy electron current in the magnetic field was revealed by the method of probing of the discharge by dust particles. Estimates show that a prevalence of the mechanism of rotation of dust structures and correspondingly the direction of rotation depends both on discharge conditions and on the size of dust particles. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Subdiffusion of dust particles in cryogenic plasmas

“…13) Even though experiments at cryogenic conditions are more challenging, further experimental and theoretical exploration of dusty plasmas at cryogenic temperatures can reveal new interesting phenomena and lead to new dusty plasma applications. 14) Indeed, at cryogenic conditions (with neutrals' temperature of the order of one kelvin) many effects and processes like wakefields, [15][16][17] plasma polarization, [18][19][20] micro-and nano-sized dust particle growth, 21) and magnetic field effects [22][23][24] can be significantly different from those at normal conditions (i.e., with neutrals at about 300 K).…”

Magnetized dusty plasma: On issues of its complexity and magnetization of charged dust particles

“…[31,[81][82][83] The collective dynamics of two-dimensional (2D) dust grains medium in the presence of magnetic field where medium exhibits rotational motion is studied by many researchers. [24,[84][85][86][87] In the presence of magnetic field, three-dimensional dusty plasma exhibits vortex motion and possibility to form counter-rotating vortices in a vertical plane. [63,88] There are available theoretical models to explain the onset of rotational motion [89] and vortex flow [31,[90][91][92] in unmagnetized and magnetized dusty plasma.…”

“…In the last 25 years, a wide spectrum of experimental and theoretical studies has been devoted to explore the collective response of dusty plasma in the form of various dynamical structures/phenomena such as dust acoustic waves, [15,16,[19][20][21][22][23] rotational and vortex motion, [24][25][26][27][28][29][30][31] crystallization and phase transition, [32][33][34][35] instability driven modes, [36][37][38][39][40] and voids. [41][42][43] The major objectives of these theoretical and experimental studies of dusty plasma were to understand the dust-plasma interaction and naturally occurring dusty plasmas, control the nano-to micron-sized dust impurities in semiconductor processing industries, explore the role of impurities on the characteristics of ambient plasma in astrophysical systems, establish it as a model system to understand the complex physical systems at a microscopic level, lower the hazardous effect of solid particles on plasma confinement in fusion devices and resolve the issues of air pollution by particulate of different sizes.…”

“…In weakly magnetized dusty plasma, only electrons are magnetized but ions are either unmagnetized or partially magnetize at low B-field. A wide range of theoretical as well experimental work on weakly magnetized dusty plasma such as waves and instabilities, [44,45] self-organized waves in annular radio-frequency (rf) discharge, [46] nonlinear vertical oscillation of dust grains, [47] localized solitary waves, [48] oblique propagating dust acoustic solitary waves, [49] and dust cluster rotation [24,50,51] is conducted by various research groups.…”

Ring dust structures in a weak inhomogeneous magnetic field

“…This can lead to degradation of the dust structure and even its complete destruction. In Reference, [17,18] a dielectric insert is used to stabilize a stratified discharge, which narrows the discharge channel. Nevertheless, some experiments are focused on studying the dynamics of rotating dusty structures in a stratified glow discharge in inhomogeneous magnetic fields.…”