Universal statistical properties of drift-interchange turbulence in TORPEX plasmas

A unique parabolic relation is observed to link skewness and kurtosis of around ten thousand density fluctuation signals, measured over the whole cross section of a toroidal magnetized plasma for a broad range of experimental conditions. All the probability density functions of the measured signals, including those characterized by a negative skewness, are universally described by a special case of the Beta distribution. Fluctuations in the drift-interchange frequency range are necessary and sufficient to assure that probability density functions can be described by this specific Beta distribution.


Publié dans:
Physical Review Letters, 98, 25
Année
2007
ISSN:
0031-9007
Mots-clefs:
Laboratoires:
SPC
CRPP




 Notice créée le 2008-04-16, modifiée le 2020-04-20


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