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.

Carreras, B., van Milligen, B., Pedrosa, M., Balbin, R., Hidalgo, C., Newman, D., et al. (1999). Experimental evidence of long-range correlations and self-similarity in plasma fluctuations. PHYSICS OF PLASMAS, 6(5), 1885-1892 [10.1063/1.873490].

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

RICCARDI, CLAUDIA;Martines, E;
1999

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.
Articolo in rivista - Articolo scientifico
magnetoplasma; turbulence; correlations
English
1999
6
5
1885
1892
reserved
Carreras, B., van Milligen, B., Pedrosa, M., Balbin, R., Hidalgo, C., Newman, D., et al. (1999). Experimental evidence of long-range correlations and self-similarity in plasma fluctuations. PHYSICS OF PLASMAS, 6(5), 1885-1892 [10.1063/1.873490].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/538
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