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Forçage à grande échelle d'une colonne de plasma faiblement magnétisée : influence d'une cathode émissive de grande taille

Abstract : The goal of this PhD is to develop a setup controlling the rotation profile of a plasma column. This study is realized within the aim of developing a new type of experiments using the strongly ionized plasmas to study magnetic induction phenomena. A great number of plasma diagnostics have been set up during the PhD, including electrostatic and optical diagnostics. These measurement technics have allowed us to characterize the evolution of the plasma parameters depending on the experimental conditions and to build a better description of the plasma. A special focus has been made on the measurement of the ion temperature by two different setups: a Fabry-Pérot with a high finesse and a Laser Induced Fluorescence (LIF) setup. The mean azimuthal velocity profile of the plasma has been measured using Mach probes and explained based on the plasma parameters radial profiles. The effect of localized current injection inside the plasma by a large size emissive electrode has been studied. We have shown that the shape and the amplitude of the velocity profile can be controlled thanks to this setup. Finally, the appearance of drift waves with high magnetic fields has been observed, along with the interaction between the current injection and the dynamic of these waves.
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  • HAL Id : tel-02087300, version 1

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Victor Désangles. Forçage à grande échelle d'une colonne de plasma faiblement magnétisée : influence d'une cathode émissive de grande taille. Physique des plasmas [physics.plasm-ph]. Université de Lyon, 2018. Français. ⟨NNT : 2018LYSEN064⟩. ⟨tel-02087300⟩

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