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Suppression of the ion drag force on dust in magnetized plasmas

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Title: Suppression of the ion drag force on dust in magnetized plasmas
Authors: James, L
Coppins, M
Item Type: Journal Article
Abstract: Modeling the transport of “dust” particles in a magnetically confined plasma device is an area of active research and requires a detailed understanding of the forces experienced by dust immersed in a plasma. One of the most significant of these is the “ion drag force.” Dust transport codes employ a model of this force that was not specifically designed for fusion plasmas and so does not consider the relevance of strong magnetic fields. However, it is shown here that the effect of magnetic fields on the ion drag force is significant for such plasmas. In this work, the Monte Carlo code DiMPl is employed to perform the first detailed characterization of the dependence of the ion drag force on magnetic fields. A semi-empirical model of this dependence is fitted onto the simulation data, so that these magnetic effects may be straightforwardly captured by dust transport codes. The limiting behavior of the ion drag force in the case of very strong fields is derived analytically and shown to be consistent with the simulation results. The validity of the results is further motivated through a novel theoretical treatment of the ion drag force at intermediate magnetic field strengths.
Issue Date: 29-Jun-2020
Date of Acceptance: 9-Jun-2020
URI: http://hdl.handle.net/10044/1/83127
DOI: 10.1063/5.0004584
ISSN: 1070-664X
Publisher: American Institute of Physics
Start Page: 1
End Page: 9
Journal / Book Title: Physics of Plasmas
Volume: 27
Issue: 6
Copyright Statement: © 2020 Author(s). This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Cite as: Phys. Plasmas 27, 063704 (2020); https://doi.org/10.1063/5.0004584
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Fluids & Plasmas
0201 Astronomical and Space Sciences
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0203 Classical Physics
Publication Status: Published
Article Number: ARTN 063704
Online Publication Date: 2020-06-29
Appears in Collections:Faculty of Natural Sciences