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Density distribution of a dust cloud in three-dimensional complex plasmas

Naumkin, Vadim and Zhukhovitskii, Dmitry and Molotkov, Vladimir and Lipaev, Andrey and Fortov, Vladimir and Thomas, Hubertus and Huber, Peter and Morfill, Gregor E. (2016) Density distribution of a dust cloud in three-dimensional complex plasmas. Physical Review E, 94 (3). American Physical Society. ISSN 1539-3755

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Official URL: http://dx.doi.org/10.1103/PhysRevE.94.033204

Abstract

We propose a method of determination of the dust particle spatial distribution in dust clouds that form in three-dimensional (3D) complex plasmas under microgravity conditions. The method utilizes the data obtained during the 3D scanning of a cloud, and it provides reasonably good accuracy. Based on this method, we investigate the particle density in a dust cloud realized in gas discharge plasma in the PK-3 Plus setup onboard the International Space Station. We find that the treated dust clouds are both anisotropic and inhomogeneous. One can isolate two regimes in which a stationary dust cloud can be observed. At low pressures, the particle density decreases monotonically with the increase of the distance from the discharge center; at higher pressures, the density distribution has a shallow minimum. Regardless of the regime, we detect a cusp of the distribution at the void boundary and a slowly varying density at larger distances (in the foot region). A theoretical interpretation of the obtained results is developed that leads to reasonable estimates of the densities for both the cusp and the foot. The modified ionization equation of state, which allows for violation of the local quasineutrality in the cusp region, predicts the spatial distributions of ion and electron densities to be measured in future experiments.

Item URL in elib:https://elib.dlr.de/109408/
Document Type:Article
Title:Density distribution of a dust cloud in three-dimensional complex plasmas
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Naumkin, Vadimjoint institute for high temperatures, ras, moscowUNSPECIFIED
Zhukhovitskii, Dmitryjoint institute for high temperatures, ras, moscowUNSPECIFIED
Molotkov, Vladimirjoint institute for high temperatures, ras, moscowUNSPECIFIED
Lipaev, Andreyjoint institute for high temperatures, ras, moscowUNSPECIFIED
Fortov, Vladimirjoint institute for high temperatures, ras, moscowUNSPECIFIED
Thomas, Hubertusdlr research group complex plasma, oberpfaffenhofenUNSPECIFIED
Huber, Peterdlr research group complex plasmas, oberpfaffenhofenUNSPECIFIED
Morfill, Gregor E.max-planck-institut für extraterrestrische physik, giessenbachstrasse, 85748 garching, germanyUNSPECIFIED
Date:2016
Journal or Publication Title:Physical Review E
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:94
Publisher:American Physical Society
ISSN:1539-3755
Status:Published
Keywords:complex plasma, plasma crystal, soft matter, microgravity, ISS
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 / Zero gravity
Location: Oberpfaffenhofen
Institutes and Institutions:Research Group Complex Plasma
Deposited By: Thomas, Dr. Hubertus M.
Deposited On:12 Dec 2016 09:28
Last Modified:31 Jul 2019 20:06

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