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Interactions between dust grains in a dusty plasma

Phys. Plasmas 7, 3851 (2000); doi:10.1063/1.1288910

Issue Date: October 2000

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Martin Lampe, Glenn Joyce, and Gurudas Ganguli
Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375-5346

Valeriy Gavrishchaka
Science Applications International Corporation, McLean, Virginia 22102
Dust grains in plasma acquire a large negative charge, and can constitute a strongly coupled system. If the plasma is stationary, the plasma-mediated electrostatic potential around a single grain can be calculated by orbital-motion-limited (OML) theory, including ion absorption at the grain surface. This potential is repulsive at all ranges, and falls off as r–2 at long range. Nonlinear modifications occur when there are several grains, but the interaction is still repulsive. If the plasma is streaming by the grains, each grain generates a wake field potential which can be calculated via linear response theory, and which attracts other grains to stationary points behind the grain. There is in addition an attractive force between grains, due to ion-impact momentum deposition. In certain parameter regimes, this "shadowing" force can yield a weak net attraction at long range. Trapped-ion effects are significant at high plasma density, but have not yet been calculated. ©2000 American Institute of Physics.
History: Received 28 March 2000; accepted 20 June 2000
Permalink: http://link.aip.org/link/?PHPAEN/7/3851/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.25.Zb
    Physics of plasmas and electric discharges Plasma properties Dusty plasmas; plasma crystals
  • 52.20.-j
    Physics of plasmas and electric discharges Elementary processes in plasma
  • 52.35.Nx
    Physics of plasmas and electric discharges Waves, oscillations, and instabilities in plasma Other nonlinear interactions and phenomena (e.g., Brillouin scattering and Rayleigh scattering)
  • YEAR: 2000

PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
Publisher:
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