Etude expérimentale des régimes dynamiques des ondes de dérive dans un plasma magnétisé de laboratoire. Contrôle du chaos spatio-temporel

Abstract : The various dynamical regimes of collisional drift waves in a magnetized plasma column are experimentally studied. These unstable low-frequency electrostatic waves are related with strong modulations of the ion and electron density. The angular velocity of the rotating plasma column is the control parameter of the dynamics: regular, chaotic and turbulent regimes are obtained. The spatial extension of the system allows for the occurrence of spatiotemporal chaos. A time-delay autosYllchronization method of controlling chaos though purely temporal is successfully applied. A numerical study using coupled nonlinear oscillators exhibiting spatiotemporal chaos is compared to the experimental results. The control method is tested on this model.
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Etienne Gravier. Etude expérimentale des régimes dynamiques des ondes de dérive dans un plasma magnétisé de laboratoire. Contrôle du chaos spatio-temporel. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 1999. Français. ⟨NNT : 1999NAN10007⟩. ⟨tel-01754344⟩

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