Resistivity, Heating and Radial Transport on the Axis of the Tokamak Discharge

In this work we present analytical and numerical results on the resistivity, heating and radial transport of particles momentum and heat on and near the minor axis of the Tokamak discharge. The crucial role of impurities is emphasized. Asymptotically exact electromagnetics and classical fluid dynamics are utilized to obtain first the case of the straight infinite cylinder. Toroidal effects are then included at the level of the Pfirsch-Schlÿter theory. Analytical results from the complete model show the transport coefficients to be classical with enhanced values related to the presence of the impurity ions and the toroidal effects. Numerical results from a simpler simulation model are found to be in reasonable agreement with published experimental results from the ST-Tokamak.