Work

Turbulence and transport in spectrally accelerated full-f gyrokinetic simulations

Year: 2025

Type: article

Abstract: We investigate edge and scrape-off layer (SOL) turbulence and transport using the spectrally accelerated full-f gyrokinetic (GK) code GENE-X, recently introduced in Frei et al (2025 Comput. Phys. Commun. 316 109817). Extending previous work on the TCV-X21 scenario, we show that the velocity-space spectral approach not only reproduces outboard midplane profiles but also captures key features of trapped electron mode (TEM)-driven turbulence and transport, including fluctuation spectra, turbulent fluxes, phase shifts, and power crossing the separatrix, in close agreement with grid-based results. This agreement remains robust when increasing spectral resolutions. We further analyze the radial force balance (accurately satisfied) and the structure of the radial electric fields and poloidal flows in the edge and SOL. Finally, we contrast our results with Braginskii-like fluid models, which inherently neglect TEMs. These results confirm the spectral full-f GENE-X approach as an efficient first-principles tool for predicting edge and SOL turbulence.

Source: Nuclear Fusion

DOI: 10.1088/1741-4326/ae114a

Authors: B.J. Frei, P. Ulbl, C. Pitzal, W. Zholobenko, F. Jenko

Institutions: Max Planck Institute for Plasma Physics, The University of Texas at Austin

Language: English

Topic: Magnetic confinement fusion research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,595

Funder: EUROfusion