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Spontaneous formation and spin of particle pairs in a single-layer complex plasma crystal

Nosenko, V. and Zhdanov, Sergey and Thomas, Hubertus and Carmona-Reyes, J. and Hyde, T. W. (2016) Spontaneous formation and spin of particle pairs in a single-layer complex plasma crystal. 43rd EPS Conference on Plasma Physics, 4-8 July 2016, Leuven, Belgium. (Unpublished)

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In this contribution, we report on the experimental observation of a new type of collective excitation in 2D plasma crystals, a spinning pair of particles, which we call a “torsion”. A torsion is a pair of identical particles oriented along the flow of ions (orthogonal to the plane of the plasma crystal), which is spinning around its axis. It is a dissipative structure where energy input is provided by the flow of ions and energy dissipation is through the neutral gas friction on particles. The experiment was carried out in a modified Gaseous Electronics Conference (GEC) rf reference cell. A single layer of melamine-formaldehyde microspheres with a diameter of 8.89±0.09 μm was suspended in the plasma sheath of a capacitively coupled discharge in argon at the pressure of 157 mtorr; the discharge power was varied in the range of 5–31 W. Upon a sudden reduction of the discharge power, spontaneous pairing of particles was observed. The pairs were oriented vertically with the upper particle above the crystal layer and the lower particle beneath it, the vertical pair size was about 0.2 mm. The pairs were spinning around their vertical axis with the upper particle leading and the lower one following it; the rotation speed was 10–13 Hz. They disturbed the plasma crystal through interaction with their neighbours. Upon further reduction of the discharge power, torsions proliferated in the plasma crystal and eventually it melted. We propose a theoretical model of a torsion based on the plasma wake effect. Torsions can be used as a diagnostic tool for plasma wakes or as a generic model of a 2D system of vortices.

Item URL in elib:https://elib.dlr.de/106156/
Document Type:Conference or Workshop Item (Speech)
Title:Spontaneous formation and spin of particle pairs in a single-layer complex plasma crystal
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Nosenko, V.v.nosenko (at) dlr.deUNSPECIFIED
Zhdanov, Sergeysergey.zhdanov (at) dlr.deUNSPECIFIED
Thomas, HubertusDLR Research Group Complex Plasma, OberpfaffenhofenUNSPECIFIED
Carmona-Reyes, J.Baylor University, Waco, Texas, USAUNSPECIFIED
Hyde, T. W.Baylor University, Waco, Texas, USAUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:complex plasma, particle pairing
Event Title:43rd EPS Conference on Plasma Physics
Event Location:Leuven, Belgium
Event Type:international Conference
Event Dates:4-8 July 2016
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 / Laboratory research
Location: Oberpfaffenhofen
Institutes and Institutions:Research Group Complex Plasma
Deposited By: Nosenko, Volodymyr
Deposited On:21 Sep 2016 09:33
Last Modified:21 Sep 2016 09:33

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