Berlin 2014 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 12: Poster Session - Magnetic Confinement

P 12.5: Poster

Dienstag, 18. März 2014, 16:30–18:30, SPA Foyer

Curvature dependance of blob dynamics in TJ-K — •Stephen Garland¹, Golo Fuchert², and Mirko Ramisch¹ — ¹Institut für Grenzflächenverfahrenstechnik und Plasmatechnologie, Universität Stuttgart — ²Institut Jean Lamour, Université de Lorraine

Turbulent transport in the scrape-off layer (SOL) is an important area of investigation in magnetic confinement fusion research. Relatively dense and hot, field-aligned, filament-like structures (blobs) have been observed to propagate radially through the SOL in many fusion devices, and contribute significantly to SOL transport. The torsatron TJ-K operates with a low-temperature plasma, allowing Langmuir probe measurements in the entire plasma volume. Despite the low temperature, investigations are relevant to fusion research due to dimensionless plasma parameters similar to those in the edge region of fusion plasmas.

Analytical blob models link blob velocity in the SOL to blob polarisation, which can be driven by magnetic field line curvature. In TJ-K, average blob dynamics can be studied in detail using a 2D movable probe and a conditional averaging technique. In addition, a fast camera can be used to supplement probe data, and provide information on individual blob trajectories. With these tools, the connection between magnetic field line curvature and the poloidal component of blob velocity has been studied. Taking into account background E×B flows, initial investigations suggest a correlation between the poloidal component of blob velocity and averaged geodesic magnetic field line curvature.