TH/P8-2 ITER Simulations with Internal and Edge Transport Barriers

Simulations of ITER with the presence of both an edge transport barrier (ETB) and an internal transport barrier (ITB) are carried out using the BALDUR integrated predictive modeling code. In these simulations, the height of the ETB or the top of the pedestal is calculated using the pedestal temperature model based on the magnetic and flow shear stabilization concept together with the infinite-n ballooning stability concept. A version of the semi-empirical Mixed Bohm/gyroBohm (Mixed B/gB) core transport model that includes ITB effects is used to compute the evolution of plasma profiles. In this model, the anomalous transport in the core can be stabilized by the influence of Er×B flow shear and magnetic shear. The combination of Mixed B/gB transport model with ITB effects together with the pedestal model is used to simulate the time evolution of temperature, density, and current profiles for ITER discharges. The presence of both internal and edge transport barriers results in complicated scenarios that yield improved performance compared with standard H-mode discharges. It is found that the formation of an ITB has a strong impact on both temperature profiles, especially near the center of the plasma.