Two-color laser scattering for diagnostics of hydrogen plasma

A two-color laser scattering (2CLS) method is proposed to measure electron and neutral densities, as well as electron and ion temperatures in hydrogen plasma. 2CLS uses two probe wavelengths to identify the Rayleigh scattering and Thomson scattering contributions coming from neutrals and electrons,...

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Bibliographic Details
Published in:Plasma sources science & technology 2022-11, Vol.31 (11), p.115012
Main Authors: Sobczuk, Franciszek, Dzierżȩga, Krzysztof, Zawadzki, Witold, Pokrzywka, Bartłomiej, Stambulchik, Evgeny
Format: Article
Language:English
Subjects:
laser-induced plasma
plasma diagnostics
Rayleigh scattering
Thomson scattering
two-colour Thomson scattering method
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Summary:A two-color laser scattering (2CLS) method is proposed to measure electron and neutral densities, as well as electron and ion temperatures in hydrogen plasma. 2CLS uses two probe wavelengths to identify the Rayleigh scattering and Thomson scattering contributions coming from neutrals and electrons, respectively. Laser scattering signals were simulated for various conditions of a hydrogen plasma at thermodynamic equilibrium applying the available and calculated cross-sections for Rayleigh scattering by ground-sate and excited hydrogen atoms at probe wavelengths of 355 nm and 532 nm. The developed 2CLS method was eventually applied to study the laser-induced plasma in hydrogen at near atmospheric pressure. Temporally and spatially resolved electron and ion temperatures and densities of electrons and hydrogen atoms (ground-state and excited) were determined.
ISSN:0963-0252
1361-6595
DOI:10.1088/1361-6595/ac9c2a