Statistical properties of fluctuation driven flows in the outboard mid-plane SOL of Alcator C-Mod

Abstract

The scale length of the radial density profile in scrape-off layer plasmas has been shown to depend on the line-averaged plasma density. While first reported on AlcatorC-Mod, recent work verifies this phenomena in JET and ASDEX Upgrade. In low density plasmas with a sheath-limited SOL, the density profiles present a two-scale structure which allows the separation of the SOL into two distinct regions. While the near SOL presents a small profile length scale, the far-SOL presents a flat density profile length scale. Transitioning into detached divertor conditions by increasing the line-averaged plasma density, the density profile features a shallow length scale. In this contribution, AlcatorC-Mods Mirror Langmuir Probe system is used to investigate the radial profiles as well as the statistical properties of flucutations in the electron density, temperature, as well as the fluctuation driven fluxes.