Erlangen 2026 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.92: Poster

Thursday, March 19, 2026, 13:45–15:45, Redoutensaal

Influence of Flow Shear Modulation on Turbulent Transport Regulation — •Carmen Sofia Vergara Interian, Mirko Ramisch, and Ralph Sarkis — IGVP, University of Stuttgart, Germany

In magnetically confined toroidal plasmas, zonal flows play a crucial role in regulating the cross-field turbulent transport. While this relation has been widely established, the detailed interrelation of transport with flow shear modulation has yet to be clarified. Hence, the spatiotemporal evolution of turbulent particle transport, together with the scale-resolved density and potential power distributions, is experimentally investigated with respect to modulation in the zonal potential as measured by a Langmuir probe array at the TJ-K stellarator. Contrary to positive zonal potential amplitudes, negative potentials are found to be associated with an increased particle flux, pointing to a weakened shear effect. Moreover, the density power spectrum reveals a cascading-like redistribution of power from small to large scales. This could indicate a mechanism in which turbulence both drives and responds to modulation in zonal potential. The effects of negative and positive zonal potential events are compared on the basis of their characteristic time scales and their influence on density-potential coupling with respect to the turbulent particle flux in magnetically confined fusion plasmas.