This title appears in the Scientific Report :
2018
In-situ measurement of optical properties of metallic surfaces using the Doppler-shifted emission of fast neutral atoms in a low density plasma
In-situ measurement of optical properties of metallic surfaces using the Doppler-shifted emission of fast neutral atoms in a low density plasma
Contribution submission to the conference Erlangen 2018In-situmeasurement of optical properties of metallic surfacesusing the Doppler-shifted emission of fast neutral atoms ina low density plasma—∙Sven Dickheuer1,OleksandrMarchuk1,Christian Brandt2,Andrei Goriaev1,MykolaIalovega1, andPSI-2 Team1...
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Personal Name(s): | Dickheuer, S. (Corresponding author) |
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Marchuk, O. / Brandt, C. / Goriaev, A. / Ialovega, M. / PSI-2-Team | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Imprint: |
2018
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Conference: | 82. Jahrestagung der DPG und DPG-Frühjahrstagung der Sektion AMOP, Erlangen (Germany), 2018-03-04 - 2018-03-09 |
Document Type: |
Abstract |
Research Program: |
Plasma-Wall-Interaction |
Publikationsportal JuSER |
Contribution submission to the conference Erlangen 2018In-situmeasurement of optical properties of metallic surfacesusing the Doppler-shifted emission of fast neutral atoms ina low density plasma—∙Sven Dickheuer1,OleksandrMarchuk1,Christian Brandt2,Andrei Goriaev1,MykolaIalovega1, andPSI-2 Team1—1Forschungszentrum Jülich GmbH- Institut für Energie- und Klimaforschung - Plasmaphysik, Partnerof the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany —2Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, GermanyThe knowledge about the optical properties of metallic surfaces dur-ing plasma exposition is crucial for many plasma diagnostics. In fusionplasmas, for instance, reflection properties of the plasma facing mir-ror and plasma wall components have a strong impact on the signalin the visible range. Until now no technique exists, which is able tomonitor the modification of the optical properties without any addi-tional calibration sources. We present anin-situtechnique to measurethe reflectance, its dynamic evolution and the polarization of differentmetallic surfaces (e.g. C, Al, Ti, Fe, Mo, Rh, Pd, Ag, Sn and W) ina H/Ar mixed plasma. The measurements are performed in the lin-ear plasma device PSI-2, operating in the electron density range of1011−1012cm−3and electron temperature range of4−10eV. Theoptical properties are measured by analyzing the Doppler-shifted emis-sion of fast hydrogen atoms, backscattered from the metallic surface,at different lines-of-sight at656.279nm (Balmer-훼line). The compar-ison between measured reflectance and theoretical data shows a verygood agreement (within 10%).Part:PType:Vortrag;TalkTopic:Plasma-Oberflächen Wechselwirkung;Plasma Wall InteractionEmail:s.dickheuer@fz-juelich.de |