Suppression of the ion drag force on dust in magnetized plasmas
File(s)POP20-AR-00247.pdf (831.77 KB)
Accepted version
Author(s)
James, Lloyd
Coppins, Michael
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.
Date Issued
2020-06-29
Date Acceptance
2020-06-09
Citation
Physics of Plasmas, 2020, 27 (6), pp.1-9
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
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000546309200001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
COLLISIONLESS
SPHERE
Publication Status
Published
Article Number
ARTN 063704
Date Publish Online
2020-06-29