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Optical characterization of Argon microwave discharge generated at sub-atmospheric pressure.

Abstract : Microwave Plasma Torch (MPT) are used since several decades as a efficient system to generate a plasma medium of high energy density with elevated thermal and active species fluxes. The evaluation of the operating parameters influence on the plasma parameters, namely electrons density and temperature, remains a decisive task in order to optimize the working operation of MPT. The current experimental investigations address the characterization by means of standard optical techniques of a regular MPT operating with Argon at sub-atmospheric pressure (1-100 mbar). Here, the optical techniques have been specifically setup to record the light intensity coming from the Argon plasma discharge, i.e. from the region where the plasma absorbs the transmitted microwave power. The excitation temperature has been determined by means of Optical Emission Spectroscopy (OES) technique at low resolution. The analysis of the distribution of population density among excited energy levels has been conducted for a broad range of working conditions. Evidences for a clear departure to equilibrium distribution has been obtained confirming the ionizing plasma situation. Complementary high-speed imaging measurements have been conducted to identify the features of the spatial extent of the discharge which exhibits a specific morphology within the covered pressure range.
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https://hal.archives-ouvertes.fr/hal-02460325
Contributor : Pascal Boubert Connect in order to contact the contributor
Submitted on : Thursday, January 30, 2020 - 8:52:26 AM
Last modification on : Wednesday, November 3, 2021 - 4:16:06 AM

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  • HAL Id : hal-02460325, version 1

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Yacine Babou, Elba Perez Peman, Mickael Jacquot, Pascal Boubert, Arnaud Bultel. Optical characterization of Argon microwave discharge generated at sub-atmospheric pressure.. 7th International Workshop on Radiation of High Temperature Gases in Atmospheric Entry, 2016, Stuttgart, Germany. ⟨hal-02460325⟩

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