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In-situ measurements of the temperature gradient in complex plasmas

Pikalev, Aleksandr and Pustylnik, Mikhail and Räth, Christoph and Thomas, Hubertus M. (2019) In-situ measurements of the temperature gradient in complex plasmas. Deutsche Physikalische Gesellschaft e.V.. DPG-Frühjahrstagung der Sektion Materie und Kosmos, 17. - 22. März 2019, München.

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Official URL: https://www.dpg-verhandlungen.de/year/2019/conference/muenchen/part/p/session/2/contribution/3

Abstract

Complex or dusty plasma is a medium containing ionized gas and micron-sized solid particles. The microparticles are sensitive to the thermophoretic force. Thermophoresis is often a disturbing factor in microgravity complex plasma experiments or a way to control the microparticle suspensions. In spite of that, no attempts to measure the temperature gradient in-situ in complex plasma are known in the literature. We present such measurements performed in Ar rf discharge used for complex plasma experiments with the help of laser spectroscopy. The experiments were performed in the PK-3 Plus chamber, where we could control the axial temperature gradient up to 5 K/cm by heating the bottom electrode. We used tunable diode laser absorption spectroscopy (TDLAS) and laser induced fluorescence (LIF) for the temperature measurement from Doppler profiles. In the case of TDLAS, two parallel laser beams passed through the discharge with a height difference of 1.5 cm. They allowed us to measure line-integrated temperatures at those two positions. The temperature differences could be measured with accuracy better than 0.5 K. The fluorescence was observed with a video camera through a narrow bandpass filter in a direction, perpendicular to the laser beam, hence the temperature could be determined locally in both axial and radial directions.

Item URL in elib:https://elib.dlr.de/126970/
Document Type:Conference or Workshop Item (Speech)
Title:In-situ measurements of the temperature gradient in complex plasmas
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pikalev, AleksandrAleksandr.Pikalev (at) dlr.dehttps://orcid.org/0000-0001-8843-074X
Pustylnik, MikhailMikhail.Pustylnik (at) dlr.deUNSPECIFIED
Räth, ChristophChristoph.Raeth (at) dlr.deUNSPECIFIED
Thomas, Hubertus M.Hubertus.Thomas (at) dlr.dehttps://orcid.org/0000-0001-8358-2023
Date:March 2019
Refereed publication:No
Open Access:Yes
In SCOPUS:No
In ISI Web of Science:No
Publisher:Deutsche Physikalische Gesellschaft e.V.
Status:Published
Keywords:complex plasma, dustz plasma, PK-3 Plus, tunable diode laser absorption spectroscopy, gas temperature
Event Title:DPG-Frühjahrstagung der Sektion Materie und Kosmos
Event Location:München
Event Type:national Conference
Event Dates:17. - 22. März 2019
Organizer:Technischen Universität München
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:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Pikalev, Aleksandr
Deposited On:15 Apr 2019 08:00
Last Modified:31 Jul 2019 20:24

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