Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 2: Magnetic Confinement I

P 2.3: Vortrag

Montag, 2. März 2015, 11:25–11:40, HZO 30

Origin and turbulence spreading of plasma blobs — •Peter Manz^1,2, Tiago Ribeiro², Bruce Scott², Gregor Birkenmeier^1,2, Daniel Carralero², Golo Fuchert³, Stefan Müller², Hans Werner Müller², Ulrich Stroth^2,1, Elisabeth Wolfrum², and the ASDEX Upgrade Team² — ¹Physik Department E28, Technische Universität München, Garching, Germany — ²Max-Planck-Institut für Plasmaphysik, Garching, Germany — ³IJL, Université de Lorraine, Vandoeuvre-lès-Nancy, France

The formation of plasma blobs is studied by analyzing their trajectories in a gyrofluid simulation in the vicinity of the separatrix. Most blobs arise at the maximum radial electric field outside the separatrix. In general, blob generation is not bound to one particular radial position or instability. The simulations show that the blob dynamics can be represented by turbulence spreading, which constitutes a substantial energy drive for far scrape-off layer turbulence and is a more suitable quantity to study blob generation compared to the skewness.