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P: Fachverband Plasmaphysik

P 10: Magnetic Confinement III/HEPP V

P 10.4: Vortrag

Mittwoch, 22. März 2023, 12:20–12:45, CHE/0091

Low-collisionality extension of the edge turbulence fluid code GRILLIX — •Christoph Pitzal, Andreas Stegmeir, Kaiyu Zhang, Wladimir Zholobenko, and Frank Jenko — Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany

Fluid models are yet the workhorse for plasma edge turbulence simulations, but the fluid assumptions have certain limitations. As one leaves the realm of validity, by decreasing collisionality, the most fragile quantity is the heat flux, as it represents usually the highest order fluid moment. These conditions can already be present in the near SOL of present day experiments and the commonly used Spitzer-Härm formula vastly overestimates the parallel heat conductivity. An approach to introduce Landau damping into fluid models and therefore predict the kinetic heat flux, is given in [1]. A method to translate this approach from k-space into configuration space, where most fluid codes act is presented in [2]. In this work the Landau-fluid closure is implemented into the edge turbulence fluid code GRILLIX [3]. This requires solving a set of elliptic equations along magnetic field lines. Turbulence simulations are performed to compare the Landau-fluid closure with the Spitzer-Härm formula. The aim is to find out whether this model is capable of predicting the parallel heat conductivity self-consistently and to investigate if non-local effects of the Landau-fluid closure can be seen. Finally, the performance of the model is assessed.

[1] G. Hammett et al., Phys. Rev. Lett., vol. 64, pp. 3019, 1990.

[2] A. Dimits et al. Physics of Plasmas, vol. 21, no. 5, 2014

[3] A. Stegmeir et al., Physics of Plasmas, vol. 26, no. 5, 2019.