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.


Published in:
Physical Review Letters, 98, 25
Year:
2007
ISSN:
0031-9007
ISBN:
0031-9007
Keywords:
Laboratories:
SPC
CRPP




 Record created 2008-04-16, last modified 2018-07-07


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