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Brownian-like motion of a single dust grain in a radio-frequency plasma discharge comparison of experiments and simulations

Rubin-Zuzic, Milenko and Nosenko, Volodymyr and Laut, Ingo and Khrapak, Sergey and Couedel, Lenaic and Thomas, Hubertus M. (2018) Brownian-like motion of a single dust grain in a radio-frequency plasma discharge comparison of experiments and simulations. 16th International Conference on the Physics of Non-Ideal Plasmas, 24-28 September 2018, Saint-Malo, France. (Unpublished)

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Bronwnian-like motion of a single dust-grain in a radio frequency plasma has been studied by different research groups. The rise of the particles temperature above “room temperature” is attributed to e.g. random fluctuations of the particle charge and fluctuations of the electrical field. Additional disturbance might occur due to gas density variations, temporal variation of the particles mass and particle interaction with the illuminating laser light. In addition, a nonoptimal frame rate of the optical diagnostic system and pixel locking can lead to an incorrect estimation of the particle kinetic temperature. Our experiments are conducted in a weakly ionized radio-frequency gas discharge at a low neutral gas pressure and power. A single micron sized spherical particle is trapped in a harmonic-like potential trap in the sheath of the lower driven electrode [1]. Its twodimensional planar motion is recorded with a long-distance microscope and a high-resolution camera. From the measured particle positions we derive the probability density function, the velocity autocorrelation function and the mean squared displacement. We obtain a particle kinetic temperature above 350 K, a neutral gas damping time of about 0.5 sec and a resonance frequency of 1-2 Hz. Anisotropic oscillation of the particle occurs, leading to angle dependent temperatures along the x and y direction in the plane of the recorded images, which can be explained by the presence of an asymmetric horizontal potential trap. Experimental observations are compared with our simulations using md simulations and the Ornstein-Uhlenbeck stochastic process.

Item URL in elib:https://elib.dlr.de/124634/
Document Type:Conference or Workshop Item (Poster)
Title:Brownian-like motion of a single dust grain in a radio-frequency plasma discharge comparison of experiments and simulations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Thomas, Hubertus M.UNSPECIFIEDhttps://orcid.org/0000-0001-8358-2023UNSPECIFIED
Date:September 2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Bronwnian-like motion of a single dust-grain
Event Title:16th International Conference on the Physics of Non-Ideal Plasmas
Event Location:Saint-Malo, France
Event Type:international Conference
Event Dates:24-28 September 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 - 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: Rubin-Zuzic, Milenko
Deposited On:07 Dec 2018 15:20
Last Modified:29 Mar 2023 00:40

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