Modelling of impurity transport experiments at the Joint European Torus

Impurity transport in JET is studied using interpretative analysis and predictive simulations of JET discharges. The simulations are based on transport models for Ion-Temperature- Gradient (ITG) mode and Trapped-Electron (TE) mode driven turbulence and neoclassical transport. The properties of the impurity transport coefficients obtained with fluidas well as quasi-linear and nonlinear gyrokinetic simulations using the code GENE are compared and discussed. In particular, the sign of the impurity convective velocity (pinch) and the scaling of the normalised impurity density peaking factor -R?nZ/n Z with impurity charge number is investigated. Predictive simulations of temperatures (Te, Ti=TZ) and densities (ne, nZ) are performed with the JETTO/SANCO core transport code.