Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.26: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Implementation of the non-linear Fokker-Planck collision operator for gyrokinetic codes using a moment approach — •Andrew Ivan Sulimro1, Philipp Ulbl1, Baptiste Frei1, and Frank Jenko1,2 — 1Max-Planck Institute for Plasma Physics — 2University of Texas at Austin
The performance of future magnetic confinement fusion power plants is primarily influenced by plasma confinement which is driven by turbulence. High-fidelity gyrokinetic simulations are key tools to investigate turbulence in fusion devices.
Accurate modeling of collisional physics is essential for these simulations. As the collision frequency is proportional to the square of the ion charge, a realistic collision operator is especially crucial for studying high-Z impurities. On the other hand, the full Fokker-Planck collision operator is computationally expensive due to its integro-differential form.
In this work, the non-linear Fokker-Planck collision operator is solved using a moment approach. This approach provides a systematic manner to capture collisions up to a desirable accuracy while maintaining performance. The implementation is verified through relaxation and conservation studies. We will also demonstrate the physical impact of collisions in zonal flow damping.
Keywords: gyrokinetic; collisions; impurities; plasma; moments