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P: Fachverband Plasmaphysik

P 5: Poster Session 1

P 5.31: Poster

Montag, 9. März 2020, 16:30–18:30, Empore Lichthof

Progress towards Gyrokinetic Turbulence in the SOL with GENE-X — •Dominik Michels, Denis Jarema, Andreas Stegmeir, and Frank Jenko — Max-Planck-Institut für Plasmaphysik, Garching, Deutschland

Understanding and predicting the effects of plasma turbulence in the Scrape-Off Layer of a tokamak is a crucial step in the optimisation of confinement for future fusion power plants. Our goal is to develop a new version of the GENE code [1], called GENE-X, to study gyrokinetic SOL turbulence. The Scrape-Off Layer poses several significant problems for gyrokinetic codes. Fluctuations of the plasma in the Scrape-Off Layer are known to be stronger than in the core. As such, nonlinear effects originating from the coupling between fluctuations become important, i.e. a full-f treatment of the underlying equations is necessary. Furthermore, the poloidal magnetic field vanishes at the X-Point of a tokamak – which introduces a coordinate singularity in the commonly used flux-aligned coordinates. We solve this problem by implementing the flux-coordinate independent approach described in [2, 3]. We present first results on simulations with GENE-X in regions of closed field lines and give an outlook on how to expand GENE-X to open field line regions by introducing sheath boundary conditions.

[1] F. Jenko et al., Phys. Plasmas 7 (2000), 1904-1910

[2] F. Hariri et al., Computer Physics Communications,
184:2419 – 2429, 2013

[3] A. Stegmeir et al., Computer Physics Communications,
198:139 – 153, 2016