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Title: Observation of multi-scale turbulence and non-local transport in LHD plasmas

We have studied two types of spatio-temporal turbulence dynamics in plasmas in the Large Helical Device, based on turbulence measurements with high spatial and temporal resolution. Applying conditional ensemble-averaging to a plasma with Edge-Localized Modes (ELMs), fast radial inward propagation of a micro-scale turbulence front is observed just after ELM event, and the propagation speed is evaluated as ∼100 m/s. A self-organized radial electric field structure is observed in an electrode biasing experiment, and it is found to realize a multi-valued state. The curvature of the radial electric field is found to play an important role for turbulence reduction.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ; ;  [1] ;  [2] ; ; ; ; ; ; ; ; ; ; ; ; ;  [1] more »;  [4] « less
  1. National Institute for Fusion Science, Toki 509-5292 (Japan)
  2. (Japan)
  3. Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)
  4. Tohoku University, Aobayama 6-6-01-2, Sendai 980-8579 (Japan)
Publication Date:
OSTI Identifier:
22252830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 5; Other Information: (c) 2014 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; EDGE LOCALIZED MODES; ELECTRIC FIELDS; ELECTRODES; LHD DEVICE; PLASMA; RESOLUTION; TURBULENCE