KINETIC DESCRIPTION OF THE ENERGETIC PARTICLES AND WAVES IN FUSION PLASMAS INTERACTION BETWEEN

Abstract : Controlling the turbulence in magnetic fusion devices is essential for the steady-state production of energy. Also, external heating generate energetic particles. When energetic particles and turbulence coexist, their mutual interaction has to be taken into account. This constitutes the main focus of this thesis. We investigate (1) the properties of one of the generation mechanisms of energetic particles and (2) the impact of energetic particles on turbulence. The generation of energetic particles is studied in ITER ICRH discharges, where we quantify the energetic particle kinetic effects on the discharge properties. For this purpose, we introduce the velocity anisotropy, which is essential to model ICRH scenarios. This is done by means of a full-wave 3D solver called EVE coupled to a module called AQL. The impact of energetic particles on electrostatic turbulence is evidenced by means of the full-f 5D gyrokinetic GYSELA code. This is done in two steps. First, the excitation of a particular class of energetic modes in the acoustic range of frequency (EGAMs) is demonstrated. Second, EGAMs are excited for the first time in flux-driven turbulent simulations. EGAMs are found to interact with turbulence in an extremely complex way. In particular, it is found that a control of turbulence with externally driven oscillating sheared flows is not straightforward. We focus our analysis on two observed phenomena. First, turbulence propagates radially in the presence of EGAMs. Second, the turbulent transport is modulated at the EGAM frequency.
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https://pastel.archives-ouvertes.fr/pastel-00765271
Contributor : David Zarzoso <>
Submitted on : Friday, December 14, 2012 - 1:38:47 PM
Last modification on : Monday, October 1, 2018 - 4:03:07 PM
Long-term archiving on : Friday, March 15, 2013 - 3:47:53 AM

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David Zarzoso. KINETIC DESCRIPTION OF THE ENERGETIC PARTICLES AND WAVES IN FUSION PLASMAS INTERACTION BETWEEN. Plasma Physics [physics.plasm-ph]. Ecole Polytechnique X, 2012. English. ⟨pastel-00765271⟩

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