A model for the electrostatic turbulence observed in the Castor tokamak

Studies of the anomalous transport in the Castor tokamak are based on measurements of plasma turbulence and on computer simulations of plasma evolution. The inverse transport problem is solved, e.g., the transport coefficients are determined from the measured plasma parameters. Starting from the empirically obtained anomalous thermal conductivity coefficient, a theoretical analysis of the microinstabilities underlying this anomalous transport is presented and an explanation of the microscopic turbulence onset and evolutionis proposed. The calculated time evolutions of radial profiles of the main plasma parameters are shown. (J.U.). 9 figs., 10 refs