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Title: Intermittency of plasma edge fluctuation data: Multifractal analysis

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.874193· OSTI ID:20217080
 [1];  [1];  [2];  [3];  [4];  [3];  [5];  [3];  [3];  [1]
  1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8070 (United States)
  2. Department of Physics, University of Alaska, Fairbanks, Alaska (United States)
  3. Asociacion Euratom-Ciemat, 28040 Madrid, (Spain)
  4. Max-Planck-Institut fuer Plasmaphysik, Euratom Association, 85740 Garching, (Germany)
  5. Max-Planck-Institut fuer Plasmaphysik, Euratom Association, 85740 Garching (Germany)
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Plasma edge fluctuations show a degree of intermittency similar to fluid turbulence. Using fluctuation measurements obtained with Langmuir probe data from two confinement devices, it is shown that plasma fluctuations have a multifractal character over the fluctuation range of scales with intermittency levels comparable to the levels measured in neutral fluid turbulence. In the mesoscale range, that is, for time scales between 10 times the turbulence decorrelation time and plasma confinement time, plasma fluctuations have a structure closer to a monofractal with very low intermittency. (c) 2000 American Institute of Physics.

OSTI ID:
20217080
Journal Information:
Physics of Plasmas, Vol. 7, Issue 8; Other Information: PBD: Aug 2000; ISSN 1070-664X
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
FLUCTUATIONS
FRACTALS
LANGMUIR FREQUENCY
ION PROBES
PLASMA CONFINEMENT
BOUNDARY LAYERS
THEORETICAL DATA