Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.22: Poster

Tuesday, February 27, 2024, 16:30–18:30, ELP 6: Foyer

Electromagnetic turbulence simulations of the tokamak edge plasma in the quasi-continuous exhaust regime — •Kaiyu Zhang, Wladimir Zholobenko, Andreas Stegmeir, and Frank Jenko — Max Planck Institute for Plasma Physics, Garching, Germany

The global fluid turbulence code GRILLIX has undergone recent advancements to include electromagnetics. This extension has revealed that the electromagnetic flutter effectively reduces ExB transport by intervening in the dynamics of drift-wave turbulence on the tokamak edge [1]. As a result, it imparts stabilizing factors of 2 in L-mode and a remarkable 100 in H-mode.

With the improved capability to resolve electromagnetic turbulence, GRILLIX is now simulating the quasi-continuous exhaust (QCE) regime. QCE is acknowledged as a promising H-mode regime for reactors due to its suppressed type-I ELMs and broadened heat fall-off length [2]. Previous research suggested that these QCE advantages stem from enhanced transport near the separatrix. Our simulations establish self-consistent turbulence transport in QCE, and the turbulence mode structures will be diagnosed to unveil the underlying mechanisms for this enhanced transport.

[1] K. Zhang , et al. arXiv:2309.07763, 2023.

[2] M. Faitsch , et al. Nuclear Fusion, 2023, 63(7): 076013.

Keywords: tokamak edge; electromagnetic turbulence; quasi-continuous exhaust regime; small ELM