Density Pedestal Prediction Model for Tokamak Plasmas
A pedestal density prediction model based on combining the transport in the pedestal to an ionization model is used to predict the density profile of tokamak H-mode pedestals. The transport model combines stiff ETG turbulence, KBM turbulence based on critical pressure gradient and a small neoclassical transport. The ionization aspect of the model calculates the penetration of cold neutrals from the SOL as well as that of charge-exchange neutrals created in the pedestal. These are the source for the particles along with the transport from the core. The model predictions are compared with profiles from experimental databases for JET-ILW, AUG and MAST. We also present predictions for future devices such as ITER and STEP. The prediction model works either using the experimental temperature profile to predict the density profile or it can predict both the temperature and the density profile using the EPED1 model in the Europed code.