Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 25: Poster III
P 25.12: Poster
Donnerstag, 29. Februar 2024, 16:30–18:30, ELP 6: Foyer
Theoretical investigation of impurity turbulent transport in W7-X — •Hugo Isaac Cu Castillo1, Alejandro Bañón Navarro1, Thilo Romba2, Felix Reimold2, Oliver Ford2, Sebastian Bannmann2, Péter Zsolt Pölöskei2, Markus Wappl2, Adrian von Stechow2, Frank Jenko1, and the W7-X team2 — 1Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany — 2Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany
The presence of impurities in the core of fusion plasmas has a detrimental effect on the overall plasma performance via fuel dilution and core cooling through increased radiative losses. While steepened density profiles of the main plasma species, i.e. electrons and hydrogen ions, correlate with high-performance plasmas [1], these scenarios also lead to an undesired accumulation of impurities within the core. Previous experiments conducted under these conditions in the stellarator Wendelstein 7-X (W7-X) appear to indicate that for ρ<0.5, impurity transport can be fully described by neoclassical transport in contrast to the turbulence-dominated transport observed for the main plasma species [2]. This work investigates the physical mechanism for this suppression of turbulent transport of impurities under steep density gradients of the main species using the gyrokinetic code GENE.
[1] S.A. Bozhenkov, et al. Nuclear Fusion 2020, 60: 066011
[2] T. Romba, et al. Nuclear Fusion 2023, 63: 076023
Keywords: Turbulent transport; impurities; gyrokinetics; Wendelstein 7-X