Impact of E × B flow shear stabilization on particle confinement and density peaking at JET

Abstract

The impact of the flow shear stabilization on particle transport and density peaking at JET is analyzed in the framework of integrated modelling with the CRONOS code. For that purpose, plasmas from a power scan which show a significant increasing of density peaking with the injected neutral beam injection power have been used as a modeling basis. By means of simulations with the quasi-linear model GLF23 for the heat and particle transport, a strong link between the particle confinement and flow shear stabilization is found. This is particularly important close to the pedestal region where the particle pinch direction becomes strongly inward for high flow shear values. Such impact introduces some non-negligible deviation from the well-known collisonality dependence of the density peaking, whose general trend has been also obtained in the framework of this modelling by performing pedestal density scans.