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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.
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| Authors: |
Carreras, B. A. [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8070 (United States)];
Lynch, V. E. [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8070 (United States)];
Newman, D. E. [Department of Physics, University of Alaska, Fairbanks, Alaska (United States)];
Balbin, R. [Asociacion Euratom-Ciemat, 28040 Madrid, (Spain)];
Bleuel, J. [Max-Planck-Institut fuer Plasmaphysik, Euratom Association, 85740 Garching, (Germany)];
Pedrosa, M. A. [Asociacion Euratom-Ciemat, 28040 Madrid, (Spain)];
Endler, M. [Max-Planck-Institut fuer Plasmaphysik, Euratom Association, 85740 Garching (Germany)];
Milligen, B. van [Asociacion Euratom-Ciemat, 28040 Madrid, (Spain)];
Sanchez, E. [Asociacion Euratom-Ciemat, 28040 Madrid, (Spain)];
Hidalgo, C. [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8070 (United States)]
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| Publication Date: | 2000 Aug 01 |
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| OSTI Identifier: | 20217080 |
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| Resource Type: | Journal Article |
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| Resource Relation: | Journal Name: Physics of Plasmas; Journal Volume: 7; Journal Issue: 8; Other Information: PBD: Aug 2000 |
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| Country of Publication: | United States |
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| Language: | English |
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| Format: | Size: page(s) 3278-3287 |
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| Other Number(s): | Journal ID: ISSN 1070-664X; PHPAEN; TRN: US00Z2125 |
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| Subject: | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; FLUCTUATIONS; FRACTALS; LANGMUIR FREQUENCY; ION PROBES; PLASMA CONFINEMENT; BOUNDARY LAYERS; THEORETICAL DATA |
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| Update Date: | 2010 Jun 03 |
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