A Full Radial Electric Field Calculation for Predicting Pedestal Formation in H-mode Tokamak Plasma by using BALDUR code

Abstract

Abstract

In this work, a prediction of pedestal formation in H-mode tokamak plasma by using the full calculation of the radial electric field () is performed with three terms of (the pressure gradient, the poloidal velocity, and the toroidal velocity). The  is used to compute an important candidate for the edge turbulence stabilization, namely the  flow shear. This full calculation is combined with the model to predict pedestal formation in H-mode tokamak plasma based on suppression of anomalous transport that uses the flow shear and the magnetic shear. All calculations are developed and tested in BALDUR integrated predictive modeling code. The simulations with time evolution of plasma current, ion and electron temperature, and particle and impurity density profiles are compared to the experimental profiles of 10 DIII-D H-mode discharges. To validate the agreement between the simulation results and the corresponding experiment results, we carried out a statistical analysis that includes a computation of the root mean square (RMS%) and the offset%. The results show that the predicted plasma profiles yield an overprediction.

Keywords: a radial electric field; tokamak plasma; pedestal; H-mode; and BALDUR code.