Simulation of edge radial electric fields in H-regimes of ASDEX-Upgrade

Abstract Radial electric fields have been simulated using the B2SOLPS5.2 transport code. Simulations were performed for three different times of one H-mode shot of ASDEX-Upgrade with three different levels of heating power. Simulation results were compared with the values of electric field measured by means of He II spectroscopy. It is demonstrated that the radial electric fields obtained in the simulations are close to the neoclassical electric fields as in the previous simulations performed both for ASDEX-Upgrade and MAST for H and L-regimes. The calculated radial electric fields are in reasonable agreement with the field profiles obtained in the experiment. Both simulations and experiment are consistent with the neoclassical character of the radial electric field in the edge barrier. The calculated toroidal rotation at the low field side equatorial midplane is of the same order as measured in the experiment and is co-current directed.