Transient behavior of density and temperature in experiments with modulated central electron heating on ASDEX Upgrade

摘要

The spatial distribution of density in a fusion experiment is of significant importance as it enters in numerous analyses and contributes to the fusion performance. A profound understanding of the underlying transport phenomena is therefore mandatory in order to reliably predict the shape of the density profile in next-step fusion devices, and finally their achievable fusion power. In the recent years, it has been shown that the application of local heat sources in the plasma can influence the shape of the density profile under certain conditions [1]. In low-density L-mode discharges, for example, the application of central heating causes a reduction of the core density and thus a flattening of the density profile. This effect is often referred to as density 'pump-out'.