skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Effect of Streaming Negative Ions on Dust Acoustic Wave Propagation in Complex Plasma

Abstract

The role of streaming negative ions on the dust acoustic wave (DAW) propagation has been investigated based on orbit motion limited (OML) theory of dust grain charging. The complex plasma being assumed as composed of Boltzmanian electrons, inertial positive ions, streaming negative ions and the variable charge dust grains. Dust charge is assumed to be fluctuating. It is found that the dust acoustic wave becomes unstable when ratio of the thermal velocity with the streaming velocity of negative ions crosses some threshold value.

Authors:
 [1]; ; ;  [2]
  1. Department of Applied Mathematics, University of Calcutta, 92, Acharyya Prafulla Chandra Road, Calcutta-700009 (India)
  2. Centre for Plasma Studies, Jadavpur University, Kolkata-700032 (India)
Publication Date:
OSTI Identifier:
20726760
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 799; Journal Issue: 1; Conference: 4. international conference on the physics of dusty plasmas, Orleans (France), 13-17 Jun 2005; Other Information: DOI: 10.1063/1.2134612; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANIONS; CATIONS; DUSTS; ELECTRONS; PLASMA; SOUND WAVES; WAVE PROPAGATION

Citation Formats

Sarkar, Susmita, Roy, Banamali, Khan, M., and Gupta, M. R.. Effect of Streaming Negative Ions on Dust Acoustic Wave Propagation in Complex Plasma. United States: N. p., 2005. Web. doi:10.1063/1.2134612.
Sarkar, Susmita, Roy, Banamali, Khan, M., & Gupta, M. R.. Effect of Streaming Negative Ions on Dust Acoustic Wave Propagation in Complex Plasma. United States. doi:10.1063/1.2134612.
Sarkar, Susmita, Roy, Banamali, Khan, M., and Gupta, M. R.. Mon . "Effect of Streaming Negative Ions on Dust Acoustic Wave Propagation in Complex Plasma". United States. doi:10.1063/1.2134612.
@article{osti_20726760,
title = {Effect of Streaming Negative Ions on Dust Acoustic Wave Propagation in Complex Plasma},
author = {Sarkar, Susmita and Roy, Banamali and Khan, M. and Gupta, M. R.},
abstractNote = {The role of streaming negative ions on the dust acoustic wave (DAW) propagation has been investigated based on orbit motion limited (OML) theory of dust grain charging. The complex plasma being assumed as composed of Boltzmanian electrons, inertial positive ions, streaming negative ions and the variable charge dust grains. Dust charge is assumed to be fluctuating. It is found that the dust acoustic wave becomes unstable when ratio of the thermal velocity with the streaming velocity of negative ions crosses some threshold value.},
doi = {10.1063/1.2134612},
journal = {AIP Conference Proceedings},
number = 1,
volume = 799,
place = {United States},
year = {Mon Oct 31 00:00:00 EST 2005},
month = {Mon Oct 31 00:00:00 EST 2005}
}
  • The Sagdeev potential approach is applied to investigate theoretically and numerically the dust acoustic soliton in electronegative dusty plasmas with streaming positive ions. The self-consistent dust charge variation is also taken into account. The lower and upper limits of Mach numbers are then derived. Moreover, it is found that both the positive ion streaming velocity and negative ion density can lower the two limits. The soliton profiles, involving the spatial potential, particle densities, dust surface potential, and space net charge distributions in various cases, are plotted and discussed.
  • We analyze the effect of a nonzero streaming velocity of both positive and negative ions on the formation of solitary waves in a relativistic plasma. The thermotive ions on the formation of solitary waves in a relativistic plasma. The thermodynamic situation is considered to be isothermal. For various values of U{sub {alpha}0/C} and n{sub {alpha}0}/n{sub {beta}0} we obtain the variations of the amplitude and the width of the solitary wave. 9 refs., 6 figs.
  • The role of negative ions on small but finite amplitude dust acoustic solitary wave including the effects of high and low charging rates of dust grains compared to the dust oscillation frequency in electronegative dusty plasma is investigated. In the case of high charging rate, the solitary wave is governed by Korteweg-de Vries (KdV) equation, but in the case of low charging rate, it is governed by KdV equation with a linear damping term. Numerical investigations reveal that in both cases dust acoustic soliton sharpens (flatens) and soliton width decreases (increases) with the increase of negative-ion number density (temperature). Also,more » the negative ions reduce the damping rate.« less
  • An expression for ion current flowing to the dust grains is proposed, when dust charge is positive and the ions are nonthermal. Secondary electron emission has been considered as the source of positive charging of the dust grains. Investigation shows that presence of positively charged dust grains along with thermal electrons and nonthermal ions generate purely growing dust acoustic waves for both the cases of ion nonthermal parameter greater than one and less than one. In the later case, the growth is conditional.
  • Propagations of nonlinear dust acoustic (DA) solitary waves and shock waves in a nonuniform magnetized dusty plasma are investigated. The incorporation of the combined effects of nonthermally distributed ions, nonadiabatic dust charge fluctuation, and the inhomogeneity caused by nonuniform equilibrium values of particle density, charging variable, and particle potential on the waves leads to a significant modification to the nature of nonlinear DA solitary waves. The nonlinear wave evolution is governed by a modified Zakhavov-Kusnetsov-Burgers (MZKB) equation, whose coefficients are space dependent. Using a generalized expansion method, new solutions for the MZKB equation are obtained. The form of solutions consistsmore » of two parts; one of them is the amplitude factor and the other is a superposition of bell-shaped and kink-type shock waves. New solutions are classified into three categories. A type of the solution is determined depending on the nonthermal parameter. Findings in this investigation should be useful for understanding the ion acceleration mechanisms close to the Moon and also enhancing our knowledge on pickup ions around unmagnetized bodies, such as comets, Mars, and Venus, including medium inhomogeneities with nonadiabatic dust charging processes.« less