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A second look at void closure in complex plasmas

Zaehringer, Erich and Schwabe, Mierk and Huber, Peter and Semenov, Igor and Knapek, Christina and Rubin-Zuzic, Milenko and Mohr, Daniel P. and Thomas, Hubertus M. (2018) A second look at void closure in complex plasmas. DPG Frühjahrstagung SAMOP, 04. - 09. März 2018, Erlangen.

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Complex Plasmas are small micrometer sized particles injected into a low temperature rf-plasma. The particles are getting charged by electron and ion fluxes and form systems with gaseous, liquid and solid properties. Normally complex plasmas are compressed to 2D systems in laboratory conditions while they form a 3D cloud in micro-gravity with a particle free region in the center which is called void. The void can be suppressed by gas flow or additional electric fields, however, both ways add stress to the system. Another way is the reduction of rf-power, which was successfully used on the ISS before. The comparison of simulations and emission patterns reveal a lot of open questions, which were targeted by experiments of the 29. DLR parabolic flight campaign. The absence of a void in 1D self-consistent simulations indicates that the void is caused by 2D effects or more difficult geometries. In the experiments we could close and reopen the void by decreasing and increasing the rf-power. Other effects, such as particle mixtures in the former void region and dust density waves across the particle cloud, were observed.

Item URL in elib:https://elib.dlr.de/119344/
Document Type:Conference or Workshop Item (Speech)
Title:A second look at void closure in complex plasmas
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Zaehringer, ErichErich.Zaehringer (at) dlr.dehttps://orcid.org/0000-0003-4718-5447
Schwabe, MierkMierk.Schwabe (at) dlr.dehttps://orcid.org/0000-0001-6565-5890
Huber, PeterP.Huber (at) dlr.deUNSPECIFIED
Semenov, IgorIgor.Semenov (at) dlr.deUNSPECIFIED
Knapek, ChristinaChristina.Knapek (at) dlr.deUNSPECIFIED
Rubin-Zuzic, MilenkoMilenko.Rubin-Zuzic (at) dlr.deUNSPECIFIED
Mohr, Daniel P.daniel.mohr (at) dlr.deUNSPECIFIED
Thomas, Hubertus M.Hubertus.Thomas (at) dlr.dehttps://orcid.org/0000-0001-8358-2023
Date:8 March 2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Mikrogravitation, Complex Plasma
Event Title:DPG Frühjahrstagung SAMOP
Event Location:Erlangen
Event Type:international Conference
Event Dates:04. - 09. März 2018
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 - Vorhaben Materialforschung und Mikrogravitation (MuM), R - Komplexe Plasmen / Zero gravity, R - Komplexe Plasmen / Laboratory research, R - Komplexe Plasmen / Theory, Simulation
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Zaehringer, Erich
Deposited On:16 Mar 2018 10:05
Last Modified:28 Mar 2019 09:00

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