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

P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.25: Poster

Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal

Characterising the Influence of E_r Magnitude and Shear on Turbulent Fluctuations in Wendelstein 7-X — •Jan Ricken, J. Proll, H. Smith, A. Langenberg, J. Bähner, G. Fuchert, E. Maragkoudakis, and G. Weir — Max-Planck-Institut für Plasmaphysik, Greifswald, Germany

In neoclassically optimised stellarators such as Wendelstein 7-X (W7-X), turbulence is the main driver of heat and particle losses, making its regulation crucial to understand. Although the radial electric field, E_r, and its shear are known to suppress turbulent transport in tokamaks, their quantitative impact in W7-X remains to be studied.

In this work, we present first results from a comprehensive database that link experimentally measured E_r profiles to (turbulent) fluctuations and transport indicators across a diverse set of W7-X programs. The database enables a systematic comparison of turbulence characteristics with both the magnitude and shear of E_r.

Experimentally observed trends are compared with neoclassical predictions from the code Neotransp to assess the consistency between measured and expected E_r profiles. In addition to providing neoclassical E_r estimates, Neotransp is also used to infer the level of turbulent transport required to satisfy power balance, thereby offering an estimate of turbulence-driven fluxes for a given E_r profile. Complementarily, GENE flux tube simulations are employed to isolate and quantify the sensitivity of turbulent fluctuations to experimentally relevant variations in the E_r shear.

Keywords: turbulence; radial electric field; stellarator