Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.43: Poster

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

Simulation of fully global electromagnetic turbulence in the stellarator W7-X — •Yann Narbutt¹, Ksenia Aleynikova¹, Matthias Borchardt¹, Ralf Kleiber¹, Alexey Mishchenko¹, Edilberto Sánchez², and Alessandro Zocco¹ — ¹Max Planck Institute for Plasma Physics, Wendelsteinstraße 1, 17489 Greifswald — ²Laboratorio Nacional de Fusión, CIEMAT, Avda. Complutense 40, Madrid 28040

Magnetic confinement fusion needs high values of β=⟨ p⟩/(B²/2µ₀), the ratio of plasma pressure to magnetic pressure, to achieve high performance. Moderate β can be beneficial for ion-temperature-gradient suppression. However, when β exceeds a certain threshold, the so-called kinetic ballooning mode (KBM) and other electromagnetic instabilities may be destabilized. These instabilities, driven by plasma pressure gradients and inherently electromagnetic, can result in strong outward-directed heat fluxes, thereby degrading plasma confinement, as has been shown by global nonlinear simulations. While KBMs have been successfully studied linearly and nonlinearly in the Wendelstein 7-X stellarator using flux-tube simulations, it has also been demonstrated that the instability tends to become most unstable as it develops a global structure on the magnetic surface. Utilizing the global gyrokinetic code EUTERPE electromagnetic instabilities and turbulence are investigated in the stellarator Wendelstein 7-X at β-values of 1%, 2.5% and 4%.

Keywords: Turbulence; Electromagnetic; Global; EUTERPE