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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. Bad Honnef Physics School on Physics of Strongly Coupled Systems, 31. Mrz. - 5. Apr 2019, Bad Honnef. (Unpublished)

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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 20 K/cm by heating the bottom electrode. We used tunable diode laser absorption spectroscopy (TDLAS) for the temperature measurement from Doppler profiles. Two parallel laser beams passed through the discharge with a height difference of 1.5 cm. The absorption is proportional to the concentration of excited atoms with a Doppler shift corresponded to the difference between the laser wavelength and the atom spectral line. This allowed us to measure line-integrated temperatures at those two positions. We investigate absorption of 772,38 nm spectral line. The temperature differences could be measured with accuracy better than 0.5 K.

Item URL in elib:https://elib.dlr.de/127158/
Document Type:Conference or Workshop Item (Poster)
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:2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:complex plasma, dustz plasma, PK-3 Plus, tunable diode laser absorption spectroscopy, gas temperature
Event Title:Bad Honnef Physics School on Physics of Strongly Coupled Systems
Event Location:Bad Honnef
Event Type:Workshop
Event Dates:31. Mrz. - 5. Apr 2019
Organizer:DPG
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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