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P: Fachverband Plasmaphysik

P 19: Magnetic Confinement V/HEPP VIII

P 19.3: Vortrag

Donnerstag, 23. März 2023, 18:25–18:40, CHE/0089

Structure splitting at the transition to self-sustained turbulence in a magnetized cylindrical plasma — •Peter Manz¹, Stefan Knauer¹, Chanho Moon², Nils Fahrenkamp¹, and Akihide Fujisawa² — ¹Institut für Physik, Universität Greifswald, Greifswald — ²Research Institution for Applied Mechanics, Kyushu University, Kasuga

When turbulent structures split more frequently before they decay, persistent turbulence forms in neutral fluid shear flows. Whether such behavior also occurs in magnetized plasmas is investigated in the experiment PANTA. With increasing control parameter the dynamics in the magnetized plasmas is known to undergo several changes from a quasiperiodic to a phase locked to a weakly turbulent regime. When the phase-locked regime breaks down, the splitting time approaches the decreasing lifetime reflecting self-sustained turbulence, as known from the pipe flow.