Simulation of dusty plasmas near surfaces in space

Details Simulation of dusty plasmas near surfaces in space Simulation of dusty plasmas near surfaces in space

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.8479g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol 99, no. A5, p. 8479-8489

Physics

3

Collisional Plasmas, Electrodynamics, Electrostatic Charge, Interplanetary Dust, Monte Carlo Method, Particle Collisions, Particle In Cell Technique, Plasma Dynamics, Plasma Sheaths, Plasma-Particle Interactions, Space Plasmas, Computerized Simulation, Mathematical Models, Plasma Drift, Surface Reactions, Two Dimensional Models

Scientific paper

A two-dimensional particle-in-cell/Monte Carlo simulation code is developed and used to examine the elctrodynamics of a finite-size dust (particulate) plasma. The model that can be applied to a dusty plasma bounded by surfaces or to a dust cloud embedded in an unbounded plasma accounts for the dynamics of plasma and dust particles, includes the collisional absorption of plasma species by the dust with the use of a multistep Monte Carlo algorithm, and solves Poisson's equation for the electric fields. Charging of isolated particulates is compared with estimates based on orbitial motion-limited current collection. The charge and potential structure of finite-length dust clouds embedded in a plasma are examined, and the results are compared to previous one-dimensional solutions. The average dust charge is found to decrease with increasing dust density. Low-density dust clouds do not perturb the potential and their average charge approaches that of isolated particulates. In the case of dense dust clouds the potential forms a sheathlike structure while the charge forms a double layer with the negative charge residing on the outer boundary of the cloud. Dust clouds initialized in the sheath of a surface biased to a potential are also examined. It is found that the dusty plasma electrodynamics is affected by the applied surface potential, plasma drift energy, and dust density. Collective effects in high-density clouds alter the sheath, which can expand or collapse. It is found that particulates can be charged negatively or positively depending on the drift energy and the applied surface potential.

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