COMPARISON BETWEEN JET PROFILE DATA AND THE PREDICTIONS OF A TRANSPORT MODEL-BASED ON ITG AND TRAPPED ELECTRON MODES - INTERPRETATIVE COMPARISON OF HEAT FLUXES AND PREDICTIVE COMPARISON OF PROFILES

The predictions of a reactive drift wave model for anomalous transport in tokamaks (Nordman et al 1990 Nucl. Fusion 30 983) are compared wit h JET profile data, using two different approaches. An interpretative approach is used to compare the radial heat fluxes under approximate s teady-state conditions. For the steady states considered, taken from s even auxiliary heated JET discharges in various regimes, the predicted total heat flux tends to be over-estimated in the inner parts or unde r-estimated in the outer parts of the good confinement region (approxi mately between q = 1 and q = 2). A predictive approach is used to comp are the density and temperature profiles of five L-mode discharges. Th ese results are in good agreement with experiments (in the good confin ement region the relative errors in the temperature profiles are less than or equal to 20% and in the density profile approximately less tha n or equal to 25%). The interpretative code TRANSP is used to obtain t he experimental profile data.