Synthèse et caractérisation de poussières carbonées dans une décharge radiofréquence

Abstract : The formation of carbon dust in tokamaks raises currently several real problems (safety, energy losses ...). To understand the mechanisms of these powders' formation (size distribution, spatial distribution and transportation) and then find out a way to limit their role, an experimental study was carried out in a radiofrequency discharge Ar/C2H2. The plasma and these carbon powders were characterized by different techniques (optical emission spectroscopy, scattering of radiation, in-situ FTIR, fast camera, SEM and ex-situ FTIR). The scattering of polychromatic radiation (IR and Ultra violet-visible-near infrared) was used to obtain some information about the powders' spatial distribution and the evolution of their size distribution. A model, based on the Mie theory and associated with the method of Monte Carlo, was developed to reproduce the optical measurements in-situ. The comparison between experiments and numerical simulations provides new roads in terms of interpretation and analysis of their results. This study is the first step to determine in real-time the dust size and density by coupling the optical measurements with the numerical model based on the Mie theory.
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Yan Peng. Synthèse et caractérisation de poussières carbonées dans une décharge radiofréquence. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10128⟩. ⟨tel-01777255⟩

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