Self-consistent non-linear description of radio-frequency wave propagation and of the edge of a magnetized plasma

Abstract : A correct understanding of the interactions between the edge plasma and the ion cyclotron (IC) waves (40-80MHz) is needed to inject reliably large amount of power required for self-sustainable fusion plasmas. These thesis objectives were to model separately, with Comsol Multiphysics, but in compatible approaches the wave coupling and the radio-frequency (RF) sheath formation to anticipate development of a single code combining both. Modelling of fast wave coupling requires a detailed description of the antenna (2D or 3D) and of the plasma environment by a full wave approach for a cold plasma. Absorption of outgoing waves is emulated by perfectly matched layers, rendered compatible with a plasma dielectric tensor. Experimental trends for the coupling resistance of the antennas of Tore Supra are qualitatively reproduced but the coupling efficiency is overestimated. In parallel a novel self-consistent description, including RF sheaths, of the interplay between the cold wave propagation and DC biasing of the magnetized edge plasma of a tokamak was developed with the minimum set of physics ingredients. For Tore Supra antenna cases, the code coupled with TOPICA allowed to unveil qualitatively some unexpected observations on the latest design of Tore Supra Faraday screens whose electrical design was supposed to minimize RF sheaths. From simulations, a DC (Direct Current) current transport appears necessary to explain the radial structures of measurements. Cantilevered bars have been identified as the design element in the antenna structure enhancing the plasma potential
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  • HAL Id : tel-01750538, version 1

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Jonathan Jacquot. Self-consistent non-linear description of radio-frequency wave propagation and of the edge of a magnetized plasma. Other [cond-mat.other]. Université de Lorraine, 2013. English. ⟨NNT : 2013LORR0257⟩. ⟨tel-01750538⟩

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