Etude numérique et expérimentale de la détection et la formation de poussières carbonées dans un plasma radio fréquence en mélange Ar/C2H2

Abstract : The dust particle growth in plasmas is of major concern for safety issues in fusion reactors, and conversely has important industrial impacts. Dusty plasmas produced in laboratory, fusion, and in astrophysical environments have been therefore widely studied for many years to better understand the involved physical phenomena. In this thesis work, we have investigated a new dust-growing mechanism in a capacitive radio-frequency plasma of argon/acetylene mixture, with developing necessary diagnostic tools. The population of nano-particles was probed using visible-wavelength range extinction measurements combined with an inverse method. The motions and the collisions in enlarging agglomerates were followed through a fast-imaging device and the images were then analyzed using a compatible algorithm (TRACE). Ex-situ studies were also carried out on dust particles collected with an extraction technique based on the thermophoresis force. These diagnostic tools allowed us to observe a spontaneous emergence of dust density waves (DDWs) under specific experimental conditions. These waves impart substantial kinetic energy to the dust particles and thus enhance their agglomeration rate. Large agglomerates up to several hundreds of microns may thus be produced in a few tens of seconds. We have also studied the influence of experimental conditions (power, pressure) on the waves and the agglomerate characteristics
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Simon Dap. Etude numérique et expérimentale de la détection et la formation de poussières carbonées dans un plasma radio fréquence en mélange Ar/C2H2. Autre [cond-mat.other]. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0084⟩. ⟨tel-01749293⟩

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