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Simulations of ion–dust streaming instability in a highly collisional plasma

Published online by Cambridge University Press:  13 November 2020

K. Quest
Affiliation:
Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA92093, USA
M. Rosenberg*
Affiliation:
Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA92093, USA
A. Levine
Affiliation:
Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA92093, USA
*
Email address for correspondence: rosenber@ece.ucsd.edu

Abstract

The excitation of low frequency dust acoustic (or dust density) waves in a dusty plasma can be driven by the flow of ions relative to dust. We consider the nonlinear development of the ion–dust streaming instability in a highly collisional plasma, where the ion and dust collision frequencies are a significant fraction of their corresponding plasma frequencies. This collisional parameter regime may be relevant to dusty plasma experiments under microgravity or ground-based conditions with high gas pressure. One-dimensional particle-in-cell simulations are presented, which take into account collisions of ions and dust with neutrals, and a background electric field that drives the ion flow. Ion flow speeds of the order of a few times thermal are considered. Waveforms of the dust density are found to have broad troughs and sharp crests in the nonlinear phase. The results are compared with the nonlinear development of the ion–dust streaming instability in a plasma with low collisionality.

Type
Research Article
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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