Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Poster II
P 12.24: Poster
Dienstag, 27. Februar 2024, 16:30–18:30, ELP 6: Foyer
Adding global parallel magnetic fluctuations to the GENE code — •Facundo Sheffield1, Tobias Goerler1, Felix Wilms1, Gabriele Merlo2, and Frank Jenko1 — 1Max-Planck-Institut für Plasmaphysik — 2The University of Texas at Austin, USA
One of the main challenges of controlled nuclear fusion is the turbulent nature of the plasma itself, which causes increased transport of energy and particles. While great progress has been made, there are still many areas of active research. Among these, the inclusion of parallel magnetic fluctuations (B1||) in turbulence simulations has become more and more relevant due to their impact on high beta and reactor relevant scenarios, potentially affecting the constraint of the edge/pedestal profiles in KBM driven scenarios.
Therefore, a long wavelength (k⊥ρs ≪ 1) approximation for parallel magnetic fluctuations was implemented on the global version of the gyrokinetic delta-f code GENE in order to improve its predictive power and asses its importance for global physics.
The approximation has been successfully tested with convergence tests and comparisons with the local version of GENE. The latter were done by porting the approximation to local GENE, which possesses an arbitrary wavelength solver, and verifying how well it agrees with the full local model. The LW approximation performs much better than previously established treatments for B1|| and surprisingly good agreement with the full model is found even at smaller wavelengths. These results are encouraging to all global GK codes implementing or employing a LW approximation for B1||. Further studies are ongoing.
Keywords: plasma; turbulence; tokamak; gyrokinetics; GENE