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Intermittent plasma fluctuations in the boundary region of the Alcator C-Moddevice were comprehensively investigated using data time-series from gas puffimaging and mirror Langmuir probe diagnostics. Fluctuations were sampled duringstationary plasma conditions in ohmically heated, lower single null divertedconfigurations with scans in both line-averaged density and plasma current,with Greenwald density fractions up to 0.85. Utilizing a stochastic model, wedescribe the plasma fluctuations as a super-position of uncorrelated pulses,with large-amplitude events corresponding to blob-like filaments moving throughthe scrape-off layer. A deconvolution method is used to estimate the pulsearrival times and amplitudes. The analysis reveals a significant increase ofpulse amplitudes and waiting times as the line-averaged density approaches theempirical discharge density limit. Broadened and flattened average radialprofiles are thus accompanied by strongly intermittent and large-amplitudefluctuations. Although these filaments are arriving less frequently at highline-averaged densities, we show that there are significant increases in radialfar-SOL particle and heat fluxes which will further enhance plasma--wallinteractions. The stochastic model has been used as a framework for study ofthe scalings in the intermittency parameter, flux and mean amplitude andwaiting times, and is being used to inform predictive capability for theeffects of filamentary transport as a function of Greenwald fraction.

Strongly intermittent far scrape-off layer fluctuations in Alcator C-Mod plasmas close to the empirical discharge density limit