Dynamical study and control of drift waves in a magnetized laboratory plasma |
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Authors: | E. Gravier X. Caron G. Bonhomme T. Pierre J. L. Briançon |
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Affiliation: | 1. Laboratoire PMIA, Université Henri Poincaré, Nancy-I, B.P. 239, 54506, Vand?uvre-lès-Nancy Cedex, France 2. Turbulence Plasma, Université de Provence, 13397, Marseille Cedex 20, France
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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. The time-delay auto-synchronization method of controlling chaos [K. Pyragas, Phys. Lett. A 170, 421 (1992)] though purely temporal is successfully applied. A numerical study using coupled nonlinear oscillators exhibiting chaos is compared to the experimental results. The control method is tested on this model. |
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