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Title: Electrostatic potential behind a macroparticle in a drifting collisional plasma: Effect of plasma absorption

Abstract

The electric field and potential behind a small absorbing body (dust grain) at floating potential has been calculated analytically in a highly collisional drifting plasma. Linear plasma response formalism has been used and main attention has been focused on the effect of plasma absorption on the grain. It is shown that the long-range asymptote of the electric field is dominated by the effect of absorption and is always negative. Depending on plasma parameters, the electric field at intermediate distances can either increase monotonically or exhibit one maximum and one minimum. It can achieve positive values in certain parameter regimes, which indicates the possibility of electrostatic attraction between the grains aligned parallel to the flow. The obtained results can be important for understanding of the binary grain interactions in complex plasmas at elevated pressures.

Authors:
; ;  [1]
  1. Max-Planck Institut fuer extraterrestrische Physik, D-85741 Garching (Germany)
Publication Date:
OSTI Identifier:
20976595
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 2; Other Information: DOI: 10.1063/1.2435707; (c) 2007 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; ABSORPTION; COLLISIONAL PLASMA; COLLISIONS; DISTANCE; DUSTS; ELECTRIC FIELDS; PLASMA PRESSURE; POTENTIALS

Citation Formats

Chaudhuri, M., Khrapak, S. A., and Morfill, G. E. Electrostatic potential behind a macroparticle in a drifting collisional plasma: Effect of plasma absorption. United States: N. p., 2007. Web. doi:10.1063/1.2435707.
Chaudhuri, M., Khrapak, S. A., & Morfill, G. E. Electrostatic potential behind a macroparticle in a drifting collisional plasma: Effect of plasma absorption. United States. doi:10.1063/1.2435707.
Chaudhuri, M., Khrapak, S. A., and Morfill, G. E. Thu . "Electrostatic potential behind a macroparticle in a drifting collisional plasma: Effect of plasma absorption". United States. doi:10.1063/1.2435707.
@article{osti_20976595,
title = {Electrostatic potential behind a macroparticle in a drifting collisional plasma: Effect of plasma absorption},
author = {Chaudhuri, M. and Khrapak, S. A. and Morfill, G. E.},
abstractNote = {The electric field and potential behind a small absorbing body (dust grain) at floating potential has been calculated analytically in a highly collisional drifting plasma. Linear plasma response formalism has been used and main attention has been focused on the effect of plasma absorption on the grain. It is shown that the long-range asymptote of the electric field is dominated by the effect of absorption and is always negative. Depending on plasma parameters, the electric field at intermediate distances can either increase monotonically or exhibit one maximum and one minimum. It can achieve positive values in certain parameter regimes, which indicates the possibility of electrostatic attraction between the grains aligned parallel to the flow. The obtained results can be important for understanding of the binary grain interactions in complex plasmas at elevated pressures.},
doi = {10.1063/1.2435707},
journal = {Physics of Plasmas},
number = 2,
volume = 14,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}
  • The stochastic energy acquired by an isolated charged macroparticle (''dust'' particle) due to electrostatic fluctuations of a weakly ionized plasma is investigated. Analytic relations are derived and numerical modeling of the problem for the conditions close to those of typical laboratory experiments in a complex dusty plasma is done. The study demonstrates that the kinetic energy of a dust particle, induced by the considered effect, can significantly exceed the temperature of the background gas. The most important contribution to the energy acquired by the macroparticle is due to the ion plasma component.
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  • SCEPTIC3D now includes charge-exchange collisions, and is used to examine ion collection by a floating conducting sphere (small compared to the electron debye length) in the presence of a background neutral drift. The enhancement of ion collection at moderate collisionalities seen for the stationary case is weakened as the drift speed increases from the ion thermal speed to the ion sound speed, above which no enhancement is seen.
  • Dusty plasma research is one of the most extensively developed areas of modern plasma physics. In spite of the large number of papers devoted to determining the electric potential of dust grains in gas discharge plasmas, this problem is still far from being resolved completely. In this paper, the behavior of the floating electric potential of a macroparticle in an electron beam-plasma system is studied in the framework of the orbit motion limited model taking into account secondary electron emission.
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