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- W2994839501 abstract "Ion saturation current (I-sat) measurements of edge plasma turbulence are analysed for six MAST L-mode plasmas that differ primarily in their edge magnetic field configurations. The analysis techniques are designed to capture the strong nonlinearities of the datasets. First, absolute moments of the data are examined to obtain accurate values of scaling exponents. This confirms dual scaling behaviour in all samples, with the temporal scale tau approximate to 40-60 mu s separating the two regimes. Strong universality is then identified in the functional form of the probability density function (PDF) for I-sat fluctuations, which is well approximated by the Frechet distribution on temporal scales tau 40 mu s, the PDFs appear to converge to the Gumbel distribution, which has been previously identified as a universal feature of many other complex phenomena. The optimal fitting parameters k = 1.15 for Frechet and a = 1.35 for Gumbel provide a simple quantitative characterization of the full spectrum of fluctuations. It is concluded that, to good approximation, the properties of the edge turbulence are independent of the edge magnetic field configuration." @default.
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- W2994839501 date "2008-08-01" @default.
- W2994839501 modified "2023-10-17" @default.
- W2994839501 title "Characterization of edge turbulence in relation to edge magnetic field configuration in Ohmic L-mode plasmas in the Mega Amp Spherical Tokamak" @default.
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