MODELLING OF TOKAMAK PLASMAS WITH INTERNAL TRANSPORT BARRIERS USING ION TEMPERATURE GRADIENT BASED MODELS

摘要

Recently, there has been considerable progress made in our physics understanding of the underlyingrntransport processes governing confinement and in modeling of tokamak discharges. It is believed thatrnrotational shear stabilization plays a major role in bifurcations in the particle, energy, and momentumrnconfinement that lead to the formation of transport barriers. However, dynamic modeling of dischargesrncontaining multi-channel bifurcations using the most theoretical transport models remains a significantrnchallenge. Presented are results obtained using the GLF23 gyro-fluid based model where variousrnnumerical techniques are explored in order to successfully allow time-dependent transport codes torndynamically follow bifurcations to enhanced confinement regimes by self-consistently computing therneffect of E × B shear stabilization.