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Plasma fluctuations in the scrape-off layer of the Alcator C-Mod tokamak inohmic and high confinement modes have been analyzed using gas puff imagingdata. In all cases investigated, the time series of emission from a singlespatially-resolved view into the gas puff are dominated by large-amplitudebursts, attributed to blob-like filament structures moving radially outwardsand poloidally. There is a remarkable similarity of the fluctuation statisticsin ohmic plasmas and in edge localized mode-free and enhanced D-alpha highconfinement mode plasmas. Conditionally averaged wave forms have a two-sidedexponential shape with comparable temporal scales and asymmetry, while theburst amplitudes and the waiting times between them are exponentiallydistributed. The probability density functions and the frequency power spectraldensities are self-similar for all these confinement modes. These results arestrong evidence in support of a stochastic model describing the plasmafluctuations in the scrape-off layer as a super-position of uncorrelatedexponential pulses. Predictions of this model are in excellent agreement withexperimental measurements in both ohmic and high confinement mode plasmas. Thestochastic model thus provides a valuable tool for predictingfluctuation-induced plasma-wall interactions in magnetically confined fusionplasmas.

Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas