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P: Fachverband Plasmaphysik

P 11: Magnetic Confinement IV

P 11.4: Vortrag

Mittwoch, 18. März 2026, 15:10–15:35, KH 02.016

Fully global simulations of electromagnetic turbulence and pressure-driven instabilities in tokamaks and stellarators — •Yann Narbutt¹, M. Borchardt¹, T. Hayward-Schneider¹, R. Kleiber¹, A. Könies¹, A. Mishchenko¹, C. Nührenberg¹, J. Riemann¹, E. Sánchez², K. Aleynikova¹, and A. Zocco¹ — ¹Max Planck Institute for Plasma Physics, Wendelsteinstraße 1, 17491 Greifswald, Germany — ²Laboratorio Nacional de Fusión, CIEMAT, Avda. Complutense 40, Madrid 28040, Spain

Magnetic confinement fusion experiments require high β=⟨ p⟩/(B²/2µ₀), the ratio of plasma pressure to magnetic pressure, to access high performance. Moderate β can be beneficial reducing for ion-temperature-gradient (ITG) driven turbulence. Typically, however, as β is increased above certain thresholds, pressure-driven instabilities appear which can potentially drive strong outward directed heat fluxes. To investigate these regimes we use the global gyrokinetic code EUTERPE to simulate plasmas in stellarators and tokamaks. Linear and nonlinear simulations, in the stellarator Wendelstein 7-X, show an unexpected absence of such instabilities as well as a reduction of heat fluxes as β rises. Given these results, additional simulations are performed in a tokamak for further understand pressure-driven instabilities from the perspective of global codes. Here, agreement between global gyrokinetics and ideal magnetohydrodynamics confirms that with large values of β pressure driven instabilities can indeed arise. However, in some parameter regimes these appear to be mitigated by kinetic and MHD effects.

Keywords: Turbulence; Global simulation; Electromagnetic; Stellarator; Tokamak