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P: Fachverband Plasmaphysik

P 19: Poster II

P 19.18: Poster

Donnerstag, 31. März 2022, 16:00–17:30, P

Analysis of nonlinear dynamics of shear Alfven waves driven by energetic trapped particles — •farah atour — IPP Garching

In controlled fusion devices, shear-Alfven waves can be driven unstable by resonant interactions with energetic alpha particles. This results in many issues regarding the confinement of the particles and therefore can prevent thermalisation of the plasma core or increase the thermal load on the material’s wall. The source of these particles is either from the nuclear fusion reaction produced by the background plasma and/or external heating systems. Due to the importance of these issues, there exists extensive literature on this topic. These studies mostly focus on the nonlinear dynamics of passing particles since they have more significant impacts. However, the nonlinear dynamics of shear-Alfven waves driven by energetic trapped particles deserves also depth analysis and will be the focus of this study. The overall goal of this work is to investigate on a deeper level the fundamental physics processes regarding both the linear stability properties and the nonlinear saturation mechanisms for a single and multi modes. For this reason, to keep the context of dynamical study simplified, these phenomena are investigated by HMGC code, which has a simple circular geometry and is based on the hybrid reduced MHD gyrokinetic model.