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String fluid instability in a complex plasma in a direct current discharge under microgravity

Schwabe, Mierk and Zhdanov, Sergey and Pustylnik, Mikhail and Thomas, Hubertus M. (2018) String fluid instability in a complex plasma in a direct current discharge under microgravity. Frühjahrstagung der Deutschen Physikalischen Gesellschaft, 05.-09. Mär. 2018, Erlangen, Deutschland.

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The PK-4 Laboratory is a Russian-European laboratory for studies on complex plasmas on board the International Space Station ISS. Its heart consists of a direct current plasma tube with 3 cm diameter and a total length of 85 cm. Microparticles of various sizes can be injected into the plasma. Here, we report on an instability formed in the microparticle cloud in which waves form. The plasma was driven in polarity switching mode - the DC electric field was quickly switched, and the microparticles were trapped in the center of the discharge. The polarity switching causes the ions and electrons of the plasma to stream around the microparticles, and the ions form wakes in downstream direction of the microparticles, which in turn attract other microparticles and lead to the formation of microparticle strings. Here, we report on the formation of waves in such a string fluid. We study the dispersion relation of the waves, demonstrate that they are not ordinary dust acoustic waves, and hypothesize on the excitation mechanism of the instability.

Item URL in elib:https://elib.dlr.de/119341/
Document Type:Conference or Workshop Item (Speech)
Title:String fluid instability in a complex plasma in a direct current discharge under microgravity
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schwabe, MierkUNSPECIFIEDhttps://orcid.org/0000-0001-6565-5890UNSPECIFIED
Thomas, Hubertus M.UNSPECIFIEDhttps://orcid.org/0000-0001-8358-2023UNSPECIFIED
Date:March 2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:komplexe Plasmen, staubige Plasmen, Elektrorheologische Flüssigkeit, Wellen, Instabilität
Event Title:Frühjahrstagung der Deutschen Physikalischen Gesellschaft
Event Location:Erlangen, Deutschland
Event Type:international Conference
Event Dates:05.-09. Mär. 2018
Organizer:Deutsche Physikalische Gesellschaft
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 - Research under Space Conditions
DLR - Research theme (Project):R - Komplexe Plasmen / Zero gravity (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Schwabe, Dr. Mierk
Deposited On:16 Mar 2018 10:04
Last Modified:29 Mar 2023 00:36

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