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• W2086758399 abstract "Recently, it has been proposed that the turbulent fluctuations measured in a linear plasma device could be described as a superposition of uncorrelated Lorentzian pulses with a narrow distribution of durations, which would provide an explanation for the reported quasi-exponential power spectra. Here, we study the applicability of this proposal to edge fluctuations in toroidal magnetic confinement fusion plasmas. For the purpose of this analysis, we introduce a novel wavelet-based pulse detection technique that offers important advantages over existing techniques. It allows extracting the properties of individual pulses from the experimental time series, and quantifying the distribution of pulse duration and energy, as well as temporal correlations. We apply the wavelet technique to edge turbulent fluctuation data from the W7-AS stellarator and the JET tokamak, and find that the pulses detected in the data do not have a narrow distribution of durations and are not uncorrelated. Instead, the distributions are of the power law type, exhibiting temporal correlations over scales much longer than the typical pulse duration. These results suggest that turbulence in open and closed field line systems may be distinct and cast doubt on the proposed ubiquity of exponential power spectra in this context." @default.
• W2086758399 created "2016-06-24" @default.
• W2086758399 creator A5002129891 @default.
• W2086758399 creator A5014371543 @default.
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• W2086758399 date "2012-09-07" @default.
• W2086758399 modified "2023-09-27" @default.
• W2086758399 title "Relevance of Uncorrelated Lorentzian Pulses for the Interpretation of Turbulence in the Edge of Magnetically Confined Toroidal Plasmas" @default.
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• W2086758399 doi "https://doi.org/10.1103/physrevlett.109.105001" @default.
• W2086758399 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23005293" @default.
• W2086758399 hasPublicationYear "2012" @default.
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