Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.50: Poster

Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Study of finite Larmor radius physics in tokamaks and stellarators with the gyrokinetic turbulence code GENE-X — •José Ángel Capitán García, Philipp Ulbl, and Frank Jenko — Max-Planck-Institut für Plasmaphysik (Garching bei München, Deutschland)

Turbulence is the main cause of transport losses in magnetically confined plasmas, affecting energy confinement in tokamaks and optimized stellarators. Understanding turbulence in the plasma core, edge, and scrape-off-layer (SOL) is crucial for improving confinement. GENE-X, an Eulerian code that solves the gyrokinetic Vlasov equation on a grid, was specifically created to address the complexities of edge and SOL turbulence simulations. It employs a collisional, full-f, electromagnetic gyrokinetic turbulence model specifically tailored for these applications. While it effectively captures turbulence in the edge and SOL regions, it currently lacks finite-Larmor-radius (FLR) effects, which are important in the plasma core, and also influence the edge. Including these FLR effects in GENE-X will be necessary to accurately simulate gyrokinetic turbulence from the plasma core to the far SOL in tokamaks and stellarators.

This work presents an extension of GENE-X, which focuses on incorporating FLR effects through the addition of rigorous gyro-averaging of turbulent fluctuations. Multiple methods will be implemented, such as the Padé approximation of the potential and gyro-matrices. This project will provide an overview of these methods and outline a practical implementation plan.

Keywords: gene-x; flr; core; gyrokinetics; turbulence