Effect of Ion Streaming on Diffusion of Dust Grains in Dissipative System

Journal Article · Mon Jan 15 04:00:00 EST 2018 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X18010038· OSTI ID:22763319

Das, N. ^[1]

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1. Tezpur University, Plasma Physics Research Laboratory, Department of Physics (India)

The presence of strong electric fields in the sheath region of laboratory complex plasma induces an ion drift and perturbs the field around dust grains. The downstream focusing of ions leads to the formation of oscillatory kind of attractive wake potential which superimpose with the normal Debye-Hückel (DH) potential. The structural properties of complex plasma and diffusion coefficient of dust grains in the presence of such a wake potential have been investigated using Langevin dynamics simulation in the subsonic regime of ion flow. The study reveals that the diffusion of dust grains is strongly affected by the ion flow, so that the diffusion changes its character in the wake potential to the DH potential dominant regimes. The dependence of the diffusion coefficient on the parameters, such as the neutral pressure, dust grain size, ion flow velocity, and Coulomb coupling parameter, have been calculated for the subsonic regime by using the Green-Kubo expression, which is based on the integrated velocity autocorrelation function. It is found that the diffusion and the structural property of the system is intimately connected with the interaction potential and significantly get affected in the presence of ion flow in the subsonic regime.

• OSTI ID: 22763319
• Journal Information: Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 1 Vol. 44; ISSN PPHREM; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DIFFUSION
DUSTS
ELECTRIC FIELDS
GRAIN SIZE
ION DRIFT
IONS
PLASMA
SIMULATION