SOL parameters and local transport in the FTU tokamak

Abstract

Poloidal asymmetries in the FTU scrape off layer (SOL) can be as high as factor 2 for density, electron temperature and their e-folding decay lengths. The insertion of an additional limiter demonstrates a strong correlation with the corresponding variation of the magnetic connection length. This and the data analysis with the 2D multifluid SOL code EPIT indicate that transport is affected by the change of the local SOL temperature. The SOL plasma appears to be not affected changing the first wall material from inconel to silicon.