Erlangen 2018 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 1: Helmholtz Graduate School I - Theory

P 1.3: Vortrag

Montag, 5. März 2018, 11:20–11:45, A 0.112

Studying Alfvén eigenmodes driven by energetic particles in fusion plasmas using hybrid-gyrokinetic modelling — •Thomas Hayward-Schneider and Philipp Lauber — Max-Planck-Institut für Plasmaphysik (IPP), 85748 Garching, Germany

Although current fusion experiments see energetic particles (eps) from their heating systems, the suprathermal alpha particle population born from the fusion reactions of future burning plasmas will have a much greater ability to interact with Magnetohydrodynamic (mhd)-like modes. We introduce Alfvén eigenmodes (aes), and describe how the toroidicity of tokamak plasmas introduces the toroidicity-induced Alfvén eigenmode (tae) gap. Perturbative modelling of these taes is presented, using the nonlinear perturbative drift-kinetic initial value code hagis and the linear gyrokinetic eigenvalue code ligka. We show that reduced models can be used for the eigenvalue problem, allowing fast semi-analytical results applicable for wide parameter scans. For the projected iter 15 mega ampere scenario, we present both linear tae physics results comparing these models, and also nonlinear mode saturation results, making predictions about the saturated perturbation amplitudes and the transition between different ep transport regimes for iter.