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Title: Origin and turbulence spreading of plasma blobs

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.
Authors:
; ;  [1] ;  [2] ; ; ; ; ; ;  [3] ;  [4]
  1. Physik-Department E28, Technische Universität München, James-Franck. Str. 1, Garching (Germany)
  2. (Germany)
  3. Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching (Germany)
  4. IJL, Université de Lorraine, CNRS (UMR 7198), BP 40239, Vandoeuvre-lès-Nancy (France)
Publication Date:
OSTI Identifier:
22408091
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASYMMETRY; COMPARATIVE EVALUATIONS; ELECTRIC FIELDS; PLASMA; PLASMA INSTABILITY; PLASMA SCRAPE-OFF LAYER; PLASMA SIMULATION; TURBULENCE