Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 25: Poster III

P 25.28: Poster

Thursday, February 29, 2024, 16:30–18:30, ELP 6: Foyer

Simulation of fully global electromagnetic turbulence in the stellarator W7-X — •Yann Narbutt¹, Alexey Mishchenko¹, Ralf Kleiber¹, Matthias Borchardt¹, and Edilberto Sánchez² — ¹Max Planck Institute for Plasma Physics, Wendelsteinstraße 1, 17489 Greifswald, Germany — ²Laboratorio Nacional de Fusión, CIEMAT, Avda. Complutense 40, Madrid 28040, Spain

Magnetic confinement fusion requires high β=⟨ p⟩/(B²/2µ₀), the ratio of plasma pressure to magnetic pressure, to access high performances. Moderate β can be beneficial for ion-temperature-gradient (ITG) driven turbulence. However, as β is increased above a certain threshold, the so-called kinetic-ballooning-mode (KBM) can be destabilized. This is a plasma pressure gradient driven instability which is inherently electromagnetic and can lead to strong outwards directed heat fluxes, degrading plasma confinement in the process. While, linearly, KBMs have been successfully studied in the stellarator Wendelstein 7-X with flux-tube simulations, it was also shown that the instability tends to be most unstable while developing a global structure on the magnetic surface. While investigating linear simulations in Wendelstein 7-X geometry with the global gyrokinetic code Euterpe both KBMs and high-β trapped electron modes have been observed. Using this code non-linear simulations are conducted on the MareNostrum supercomputer to investigate the turbulent behaviour of these electromagnetic instabilities.

Keywords: Wendelstein 7-X; Global Simulation; KBM; ITG; Turbulence