Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 22: Helmholtz Graduate School for Plasma Physics II

P 22.3: Fachvortrag

Mittwoch, 4. März 2015, 17:20–17:45, HZO 50

Fluid-electron, gyrokinetic-ion simulations of global modes in magnetic fusion devices — •Michael Cole, Alexey Mishchenko, and Axel Könies — Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany

A practical fusion reactor will require a plasma beta of around 5%. In this regime, the MHD stability of the plasma is an important limiting factor. The influence of gyrokinetic effects on the stability of MHD modes is incompletely understood. Some phenomena, such as the Toroidal Alfvén Eigenmode, are inherently unstable as a result of kinetic interactions with MHD modes. Others, such as ballooning modes, may be significantly stabilised or destabilised by gyrokinetic effects. In this work, a fluid-electron, gyrokinetic-ion model is implemented for an existing gyrokinetic code. This model offers certain practical benefits over full gyrokinetic codes, such as faster running times and reduced utilisation of computational resources, at the expense of reduced completeness. When combined with existing MHD and gyrokinetic models, however, a hierarchy of numerical tools can be applied to isolate and characterise the relative influence of different physical effects. It is intended to apply these models to investigate the behaviour of large tokamaks such as ITER and optimised stellarators such as Wendelstein 7-X at realistic reactor betas.