SMuK 2023 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.19: Poster

Mittwoch, 22. März 2023, 17:30–19:00, HSZ EG

Interplay of turbulent density and momentum transport in TJ-K plasmas — •Ralph Sarkis and Mirko Ramisch — IGVP, University of Stuttgart, Germany

Turbulent fluctuations of the potential and density in the magnetically confined plasma at the TJ-K stellarator are coupled as to give rise to radial turbulent cross-field transport of particles and poloidal momentum. Both transport phenomena have mutually exclusive prerequisites, being a strong density-potential cross-coupling for the Reynolds stress and decoupling for the particle transport. A poloidal Langmuir probe array is used to understand the turbulent transport phenomena in dependence of the geometry. This also allows to examine temporal alternations in the density-potential cross-coupling as a possible explanation for their coexistence. Conditional sampling and cross-correlation of transport with respect to the occurrence of zonal-potential events is used to establish a temporal and spatial relation, unravelling the dependence and coupling factors at play in both turbulent processes. Spectral analysis is also applied to address the interplay and to distinguish amplitude from phase modulations.