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Study of the Void-Induced Plasma Emission in Capacitively-coupled RF Complex Plasmas

Pikalev, Aleksandr and Semenov, Igor and Pustylnik, Mikhail and Räth, Christoph and Thomas, Hubertus M. (2020) Study of the Void-Induced Plasma Emission in Capacitively-coupled RF Complex Plasmas. 62nd Annual Meeting of the APS Division of Plasma Physics, 2020-11-09 - 2020-11-13, USA.

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Official URL: https://meetings.aps.org/Meeting/DPP20/Session/ZP08.16


Complex or dusty plasma is a medium containing ionized gas and micron-sized solid particles. A Void --- a microparticle-free area --- can disturb the microparticle suspension homogeneity. The void also determines the nanoparticle generation cycle in plasma reactors. Although the void formation has been studied for decades, understanding of its behaviour is still incomplete. We experimentally demonstrate that the void in the RF discharge complex plasma can exist in two qualitative different regimes. The "bright" void is characterized by bright plasma emission associated with the void, whereas the "dim" void possesses no emission feature. The transition from the dim to the bright regime occurs with the increase of the discharge power and has a threshold character. The threshold is manifested by a kink in the void size power dependencies. We reproduce the bright void 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 week electrostatic forces. The electric field at the void boundary occurs to be so small that it, in accord with the experimental observation, causes no void-related emission feature.

Item URL in elib:https://elib.dlr.de/142946/
Document Type:Conference or Workshop Item (Poster)
Title:Study of the Void-Induced Plasma Emission 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:13 November 2020
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:complex plasma, RF discharge, void, optical emission spectroscopy, fluid model
Event Title:62nd Annual Meeting of the APS Division of Plasma Physics
Event Location:USA
Event Type:international Conference
Event Start Date:9 November 2020
Event End Date:13 November 2020
Organizer:American Physical Society
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 15:49
Last Modified:24 Apr 2024 20:42

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