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Approximate expression for the electric potential around an absorbing particle in isotropic collisionless plasma

Semenov, Igor and Khrapak, Sergey and Thomas, Hubertus (2015) Approximate expression for the electric potential around an absorbing particle in isotropic collisionless plasma. Physics of Plasmas, 22, 053704. American Institute of Physics (AIP). DOI: 10.1063/1.4921249 ISSN 1070-664X

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Abstract

A new approximate expression for the potential distribution around an absorbing particle in isotropic collisionless plasma is proposed. The approximate expression is given by the sum of the Debye-H€uckel potential with an effective screening length and the far-field asymptote obtained from the solution of the linearized Poisson equation. In contrast to analogous models, the effective screening length is not fixed but depends on the distance from the particle. This allows us to obtain a more accurate approximation for the potential distribution in the entire range of distances. The dependence of the screening length on the distance is predicted from the analysis of the charge density distribution function. This dependence contains two adjustable parameters, which are calculated by applying the procedure based on charge balance considerations. Using the obtained results, simple expressions for the parameters of the model are proposed. In addition, a simple expression for the characteristic screening length, which can be used to approximate the potential distribution near the particle, is obtained. The developed model potential is shown to be in excellent agreement with the solution of the nonlinear Poisson equation for typical conditions used in experiments with complex plasmas.

Item URL in elib:https://elib.dlr.de/96965/
Document Type:Article
Title:Approximate expression for the electric potential around an absorbing particle in isotropic collisionless plasma
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Semenov, IgorForschungsgruppe Komplexe Plasmen, DLR, OPUNSPECIFIED
Khrapak, SergeyDLR, Sergey.Khrapak (at) dlr.deUNSPECIFIED
Thomas, HubertusDLR Research Group Complex Plasma, OberpfaffenhofenUNSPECIFIED
Date:15 May 2015
Journal or Publication Title:Physics of Plasmas
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:22
DOI :10.1063/1.4921249
Page Range:053704
Publisher:American Institute of Physics (AIP)
ISSN:1070-664X
Status:Published
Keywords:complex (dusty) plasmas, interaction potential, plasma screening, effective screening length
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Komplexe Plasmen / Theory, Simulation
Location: Oberpfaffenhofen
Institutes and Institutions:Research Group Complex Plasma
Deposited By: Khrapak, Sergey
Deposited On:09 Jul 2015 08:21
Last Modified:06 Sep 2019 15:18

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