Thermally driven turbulence and transport in a sheared system

Results from a novel theory of radiatively enhanced tokamak edge turbulent transport are presented. A serious restriction on the impurity radiation drive is identified. In particular, due to a lack of pressure balance near a rational surface, the condensation effect does not survive. Consequently, the thermal instability drive is the only impurity radiation instability which remains. Our analysis consists of a theoretical calculation for the thermally driven drift-rippling mode model (φ, n, T, v parallel ). We present calculations of the edge fluctuations and the resultant transport coefficients versus radius.