Kiel 2011 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 11: Poster: Hochtemperaturplasmen: Theorie und Simulation

P 11.2: Poster

Dienstag, 29. März 2011, 17:00–19:00, Foyer

Filament velocity scaling in SOL plasmas — •Ralph Kube and Odd Erik Garcia — University of Tromsø, Tromsø, Norwegen

In the edge region of magnetically confined plasmas one observes intermittent transport of plasma by filaments elongated along the magnetic field lines. These filaments carry excess plasma particles and heat and are referred to as blobs. Blobs are created behind the LCFS and move radially outwards through the SOL, contributing significantly to particle and heat loss as well as wall erosion. Recent experimental progress shows a broad range of blob velocities with regimes where the blobs accelerate and regimes where it presents a constant velocity in the range of the acoustic velocity.

This work presents the blob velocity scaling for a electrostatic interchange model. Numerical simulations show the blob velocity scaling depending on sheath parallel currents. We identify regimes blob acceleration behaviour and a velocity scaling depending on the size of the structure.