Origin and turbulence spreading of plasma blobs

Journal Article · Sun Feb 15 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4908272· OSTI ID:22408091

Manz, P.; Birkenmeier, G.; Stroth, U. ^[1]; Ribeiro, T. T.; Scott, B. D.; Carralero, D.; Müller, S. H.; Müller, H. W.; Wolfrum, E. ^[2]; Fuchert, G. ^[3]

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1. Physik-Department E28, Technische Universität München, James-Franck. Str. 1, Garching (Germany)
2. Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching (Germany)
3. IJL, Université de Lorraine, CNRS (UMR 7198), BP 40239, 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. A simple model of turbulence spreading for the scrape-off layer is derived. 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.

• OSTI ID: 22408091
• Journal Information: Physics of Plasmas, Vol. 22, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASYMMETRY
COMPARATIVE EVALUATIONS
ELECTRIC FIELDS
PLASMA
PLASMA INSTABILITY
PLASMA SCRAPE-OFF LAYER
PLASMA SIMULATION
TURBULENCE