Investigation of high density regimes in FTU by pellet injection and impurity seeding

High field pellet fuelled discharges in FTU have achieved good energy and particle confinement properties in ohmic quasi-steady regime. Peak densities close to 1x1021 m-3 have been obtained, showing a post pellet decay time of several energy confinement times. Experiments aimed at obtaining Radiative Improved Modes (RIM) at high field have also been carried out using Neon injection. We have observed an increase of average density with respect to the reference discharge, which cannot be explained by the contribution of Neon. The neutron yield increases also by a factor 3- 6 and the energy confinement time increases by a factor 1.4