The upgraded ASDEX Upgrade contribution to the ITPA confinement database: description and analysis

Abstract The ITPA multi-machine confinement database has been recently extended, in particular to account for the effect of metallic plasma facing components installed ASDEX Upgrade and JET tokamaks during last decade. Confinement data from tokamak have contributed since 1994. present version, which includes 1994 2017, is described discussed this article. aim work document before it made public report on main results properties reflected database. Through transition carbon wall, operation at low density originally accessible with strongly limited by occurrence tungsten accumulation. However, medium high densities, walls are rather similar. analysis yields both cases a strong current dependence clearly negative magnetic field dependence. negligible, while well-known positive impact triangularity appears very clearly. These dependences partly variance widely-used IPB98(y,2) scaling, but agreement upgraded databases. degradation observed gas puffing can be attributed profile outer region, as reported previous studies.