SMuK 2023 – scientific programme

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P: Fachverband Plasmaphysik

P 11: Poster I

P 11.41: Poster

Wednesday, March 22, 2023, 14:00–15:30, HSZ EG

Electromagnetic flutter in the full-f edge turbulence fluid code GRILLIX — •kaiyu zhang, wladimir zholobenko, andreas stegmeir, christoph pitzal, konrad eder, and frank jenko — Max Planck Institut für Plasmaphysik, Boltzmannstr.2, 85748 Garching, Germany

Electromagnetic flutter has been implemented and verified in GRILLIX, a full-f turbulence code for the edge and scrape-off layer in tokamaks. Simulations for L-mode ASDEX Upgrade are performed with electromagnetic flutter. We particularly investigate how flutter transport contributes to the density advection and heat conduction perpendicular to the magnetic flux surfaces.

An issue arising during the computation of flutter is that a large-scale magnetic shift will be double-counted in the fixed background magnetic equilibrium and in the full-f turbulence. Commonly, the toroidal average of magnetic potential was stripped to remove this shift. However, this method is found to cause a spurious reduction of the perpendicular flutter turbulent transport in GRILLIX. Two refined methods are explored: (1) removing the time averaged magnetic field; (2) tracing the evolution of Pfirsch-Schluter currents analytically and removing the corresponding induced magnetic field. The new methods seem superior in preserving the amplitude of the perpendicular flutter turbulence transport.