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Caractérisation des instabilités à basse fréquence dans une colonne de plasma magnétisé et étude de leur transition à la turbulence

Abstract : This work is devoted to the experimental study of low frequency instabilities that occur in a magnetized plasma column. By using a limiter at the entry of the column, a transition between the Kelvin-Helmholtz instability and drift waves is observed when the magnetic field is increased. The Rayleigh-Taylor (or centrifugal) instability, can also be observed in between. With a view to to improve the efficiency of control methods, within the framework of controlled thermonuclear fusion research, we then studied the transitions to turbulence of these various instabilities. For each of them, a similar transition scenario is observed, in which spatio-temporal chaos results from the nonlinear interaction between two modes of incommensurable frequencies.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_2004_0184_BROCHARD.pdf
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https://hal.univ-lorraine.fr/tel-01746746
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Submitted on : Thursday, March 29, 2018 - 10:44:00 AM
Last modification on : Wednesday, March 24, 2021 - 10:22:02 AM

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  • HAL Id : tel-01746746, version 1

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Frédéric David Brochard. Caractérisation des instabilités à basse fréquence dans une colonne de plasma magnétisé et étude de leur transition à la turbulence. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10184⟩. ⟨tel-01746746⟩

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