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Dim and bright void regimes in capacitively-coupled RF complex plasmas

Pikalev, Aleksandr and Semenov, Igor and Pustylnik, Mikhail and Räth, Christoph and Thomas, Hubertus M. (2021) Dim and bright void regimes in capacitively-coupled RF complex plasmas. Plasma Sources Science and Technology, 30 (3), 035014. Institute of Physics (IOP) Publishing. doi: 10.1088/1361-6595/abe0a2. ISSN 0963-0252.

[img] PDF - Postprint version (accepted manuscript)

Official URL: https://iopscience.iop.org/article/10.1088/1361-6595/abe0a2


We demonstrate experimentally that the void in capacitively-coupled RF complex plasmas can exist in two qualitatively different regimes. The 'bright' void is characterized by bright plasma emission associated with the void, whereas the 'dim' void possesses no detectable emission feature. The transition from the dim to the bright regime occurs with an increase of the discharge power and has a discontinuous character. The discontinuity is manifested by a kink in the void size power dependencies. We reproduce the bright void (mechanically stabilized due to the balance of ion drag and electrostatic forces) by a simplified time-averaged 1D fluid model. To reproduce the dim void, we artificially include the radial ion diffusion into the continuity equation for ions, which allows to mechanically stabilize the void boundary due to very weak electrostatic forces. The electric field at the void boundary occurs to be so small that it, in accordance with the experimental observation, causes no void-related emission feature.

Item URL in elib:https://elib.dlr.de/142938/
Document Type:Article
Title:Dim and bright void regimes in capacitively-coupled RF complex plasmas
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Pikalev, AleksandrUNSPECIFIEDhttps://orcid.org/0000-0001-8843-074XUNSPECIFIED
Semenov, IgorUNSPECIFIEDhttps://orcid.org/0000-0001-6689-448XUNSPECIFIED
Thomas, Hubertus M.UNSPECIFIEDhttps://orcid.org/0000-0001-8358-2023UNSPECIFIED
Date:27 January 2021
Journal or Publication Title:Plasma Sources Science and Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:035014
Publisher:Institute of Physics (IOP) Publishing
Keywords:dusty plasma, RF discharge, RF-period-resolved optical emission spectroscopy, void, 1D fluid model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Pikalev, Aleksandr
Deposited On:14 Jul 2021 15:46
Last Modified:05 Dec 2023 07:47

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