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Experimental evidence of long-range correlations and self-similarity in plasma fluctuations

Description/Abstract

To better understand long time transport dynamics, techniques to investigate long-range dependences in plasma fluctuations have been applied to data from several confinement devices including tokamaks, stellarators, and reversed field pinch. The results reveal the self-similar character of the edge plasma fluctuations. This implies that the tail of the autocorrelation function decays as a power law and suggests that there is a superdiffusive component of the anomalous transport. Rescaled fluctuation and turbulent flux spectra from different devices also show a strong similarity. For a range of parameters corresponding to the tokamak ohmic regime and equivalent power for other devices, the spectral decay index may show a universal character.

Authors: Carreras, B.A.; van Milligen, B.P.; Pedrosa, M.A.; Balbin, R.; Hidalgo, C.; Newman, D.E.; Sanchez, E.; Bravenec, R.; McKee, G.; Garcia-Cortes, I.; Bleuel, J.; Endler, M.; Ricardi, C.; Davies, S.; Matthews, G.F.; Martines, E.; Antoni, V. [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8070 (United States)]
Publication Date:1999 May 01
OSTI Identifier: 344914
Report Number(s):CONF-981127--
Resource Type:Journal Article
Resource Relation:Journal Name: Physics of Plasmas; Journal Volume: 6; Journal Issue: 5; Conference: 40. annual physics of plasmas meeting, APS Division of Plasma Physics, New Orleans, LA (United States), 16-20 Nov 1998; Other Information: PBD: May 1999
Country of Publication:United States
Language:English
Format: Size: pp. 1885-1892
Other Number(s):Journal ID: PHPAEN; ISSN 1070-664X; TRN: 99:005507
Subject:70 PLASMA PHYSICS AND FUSION; PLASMA DIAGNOSTICS; CORRELATIONS; FLUCTUATIONS; TOKAMAK DEVICES; STELLARATORS; REVERSED-FIELD PINCH DEVICES; CHARGED-PARTICLE TRANSPORT
Update Date:2009 Dec 16

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