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Étude des structures de courant et de potentiel autour d’une antenne radio-fréquence dans un plasma magnétisé

Abstract : Controlled thermonuclear fusion is a possible solution for the production of almost inexhaustible clean energy for future generations. However, the temperatures required to carry out the fusion of the nuclei are of the order of one hundred million degrees. At these temperatures matter is in the state of plasma, an ionized gas, which allows us to confine it in strong magnetic fields. Among the heating means used in magnetic fusion reactors (Tokamaks and Stellarators), we will be interested in ion cyclotron resonance heating via antennas emitting an electromagnetic field in the radio frequencies range. Understanding the behavior of plasma around these ICRH antennas or more generally in the presence of RF waves and a magnetic field is a major issue to minimize the flow of accelerated particles in RF sheaths in contact with an antenna or an electrode. The ALINE experimental reactor (a linear experiment) was precisely designed with the aim of studying the RF sheaths and the structures generated around the antennas. This thesis presents the experimental results obtained in ALINE by means of Langmuir probe measurements. A manipulator arm makes allows us to automatically move the probe within the wole device, and to draw up a map of the plasma parameters. After having studied in depth the problem of probe measurements under field (effective surface of electronic collection, bumped characteristics), the development of an iterative algorithm of exploitation only using the ionic saturation current of the probe characteristics made it possible to exploit automatically all acquired data. The measurements are confronted with several theories and simulations, in order to model and to better understand the plasma parameter structures in front of an RF electrode inclined with respect to the magnetic field lines.
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Submitted on : Friday, October 9, 2020 - 3:46:38 PM
Last modification on : Wednesday, November 3, 2021 - 7:09:47 AM
Long-term archiving on: : Sunday, January 10, 2021 - 6:52:00 PM


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  • HAL Id : tel-02962916, version 1


J. Ledig. Étude des structures de courant et de potentiel autour d’une antenne radio-fréquence dans un plasma magnétisé. Physique des plasmas [physics.plasm-ph]. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0082⟩. ⟨tel-02962916⟩



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