Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session I

P 10.22: Poster

Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Towards Implementing a Hirshman-Sigmar Type Collision Operator in the Gyrokinetic Code GENE-X — •Andrew Ivan Sulimro, Philipp Ulbl, and Frank Jenko — Max Planck Institute for Plasma Physics

The performance of future magnetic confinement fusion power plants is primarily influenced by the turbulence-driven quality of plasma confinement and heat exhaust. High-fidelity gyrokinetic simulations are key tools to investigate turbulence in fusion devices. The GENE-X gyrokinetic code is designed to simulate such situations in the complex geometry of the edge and scrape-off layer regions.

One of the important aspects influencing the accuracy of a gyrokinetic solver is the physics realism of the collision model. In the current state, the gyrokinetic code GENE-X is equipped with the Lenard-Bernstein/Dougherty (LBD) operator which is a lightweight alternative to the Fokker-Planck operator. However, the LBD operator lacks the accuracy to study different plasma components, such as impurities. 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.

In this work, a more accurate collision operator of Hirshman-Sigmar type is implemented into GENE-X. This new operator can capture additional effects, such as an accurate pitch-angle scattering and the velocity dependence of the collision frequency, which are not accounted for by the LBD operator. The models involved and the numerical aspects of the implementation will be presented and discussed.