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The Influence of Filaments on Scrape-Off Layer Transport in MAST

The tokamak scrape-off-layer (SOL) is a primary component of the interface between the core plasma and the material surfaces of the vacuum vessel. Investigations on the Mega-Ampere Spherical Tokamak (MAST) have been undertaken in an effort to characterise the filamentary nature of the SOL and to assess the influence of this intermittency on traditional steady-state approximations of the plasma transport. Distribution functions for Lmode, ELM and inter-ELM filament properties have been determined from fast camera, reciprocating probe data and time-resolved Thomson scattering measurements, and average values for filament size and motion (including parallel flows within filaments) are reported. A 4D dedicated interpretive code for the boundary plasma is being developed, based on extensions to the OSM-EIRENE package. Initial results for filament evolution are presented, where the filament properties in the simulation are prescribed from the measured data. The model captures the essential features of intermittent transport in the boundary and can therefore be used to quantitatively assess the validity of the steady-state SOL approximation.