Labit, B.Diallo, A.Fasoli, A.Furno, I.Iraji, D.Mueller, S. H.Plyushchev, G.Podestà , MarioPoli, F. M.Ricci, P.Theiler, C.Horacek, J.2008-05-232008-05-232008-05-23200710.1088/0741-3335/49/12B/S26https://infoscience.epfl.ch/handle/20.500.14299/25911WOS:00025274590002812165A unique parabolic relation is observed to link skewness and kurtosis of density fluctuation signals, measured over the whole cross-section of the simple toroidal device TORPEX for a broad range of experimental conditions. This relationship is also valid for density fluctuation signals measured in the scrape-off layer of the TCV tokamak. All the probability density functions (PDFs) of the measured signals, including those characterized by a negative skewness, are universally described by a special case of the beta distribution. In TORPEX, fluctuations in the drift-interchange frequency range are necessary and sufficient to assure that PDFs can be described by this specific beta distribution. For a more detailed plasma scenario, it is shown that electron temperature and plasma potential fluctuations have different statistical properties compared with the density.TORPEX groupStatistical properties of electrostatic turbulence in toroidal magnetized plasmastext::journal::journal article::research article