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Experimental observation of large 2D plasma crystals

Nosenko, Volodymyr and Meyer, John and Zhdanov, Sergey and Thomas, Hubertus M. (2019) Experimental observation of large 2D plasma crystals. 46th European Physical Society Conference on Plasma Pysics, 8-12 July 2019, Milan, Italy.

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Two-dimensional (2D) complex plasma crystals are popular model systems where various generic as well as plasma-specific phenomena can be studied in real time at the level of individual particles. System-size dependence of the plasma crystal properties is an important issue which is not fully understood due to the limited size (and particle number) of the crystals obtained so far. To achieve larger plasma crystals, a new experimental setup was built at the DLR Institute of Materials Physics in Space [1]. It is based on a relatively large (90 cm in diameter) vacuum chamber where a capacitively coupled radio-frequency (rf) discharge is used to suspend a 2D cloud of micrometer-size polymer particles. The discharge is created between the lower rf electrode and the grounded chamber walls, the particles levitate in the plasma (pre)sheath above the electrode. The particles were arranged in a triangular lattice with hexagonal symmetry. The pair correlation function for particles g(r) has a sharp first peak and fully split second peak. This plasma crystal is much larger and contains more particles than the crystals produced in previous experiments using the GEC rf reference cell. In preliminary tests, plasma crystals with a diameter of up to 50 cm were achieved. Further tests showed that stable 2D plasma crystals can be suspended in argon plasma at the pressure as low as 0.1 Pa. In these experimental conditions, the Epstein neutral gas damping rate is a small fraction (around 0.5%) of the complex plasma's Einstein frequency. Therefore, virtually undamped dynamics can be studied in detail in this system. 1. V. Nosenko, J. K. Meyer, S. K. Zhdanov, and H. M. Thomas, AIP Advances 8, 125303 (2018).

Item URL in elib:https://elib.dlr.de/130068/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental observation of large 2D plasma crystals
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Thomas, Hubertus M.UNSPECIFIEDhttps://orcid.org/0000-0001-8358-2023UNSPECIFIED
Date:10 July 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:complex plasma, large two-dimensional plasma crystal
Event Title:46th European Physical Society Conference on Plasma Pysics
Event Location:Milan, Italy
Event Type:international Conference
Event Dates:8-12 July 2019
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 / Laboratory research (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Nosenko, Volodymyr
Deposited On:04 Nov 2019 09:18
Last Modified:04 Nov 2019 09:18

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