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Modélisation d'un réflectomètre mode X en vue de caractériser les fluctuations de densité et de champ magnétique : applications aux signaux de Tore Supra

Abstract : This work deals with the interaction between a probing wave and plasma fluctuations. For all probing wave polarization in reflectometry experiments, this interaction can be described by a Mathieu's equation. In order to check the validity domain of our model we have developed softwares with new numerical schems (both in O-mode and X-mode). After these validations, the ratio of the wave amplitude backscattered by density and magnetic fluctuations has been evaluated, and we have confirmed that the density fluctuations are prominent in most of cases in tokamak expermiments. The accuracy of numerical methods is high enough to simulate the reflectometer experiments. The part of coherent fluctuations in 1D is now well determined and a new connection between the spectrum of the phase variations and the turbulence spectrum has been shown.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2001_0181_COLIN.pdf
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https://hal.univ-lorraine.fr/tel-01746568
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Submitted on : Thursday, March 29, 2018 - 10:40:26 AM
Last modification on : Monday, December 14, 2020 - 3:08:41 PM

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  • HAL Id : tel-01746568, version 1

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Muriel Colin. Modélisation d'un réflectomètre mode X en vue de caractériser les fluctuations de densité et de champ magnétique : applications aux signaux de Tore Supra. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10181⟩. ⟨tel-01746568⟩

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