Recent experiments iwth Optimised shear plasma in JET[1,2] revealed some unusual features of the Internal Transport Barrier dynamics, which pose a challenge to theory based transport models. Particularly, experiments showed that the width of the ITB, after emeragence, expands initially in time until it reache saturation. Very often this saturation does not lead to a real steady state but is followed by the erosion nad sometimes by the compelte collapse of the ITB. In order to assess the feadsibility of contemporary transport models to reporduce these kind of dynamics, we perform predictive numerical modelling of some of the JET optimised shear discharges. To make the modelling fully self-consistent, we include toroidal and poloidal rotation into the list of simulated parameters. Since toroidal rotation is controleld by a not yet thoroughly understood anomalous viscosity, we first test our model for this viscosity on a number of ELMy H-mode plasma which constitute a #rho#~* scan. This model was then used ot simulate the evolution of the readial electric field and turbulence suppresion in the OPtimised shear JET plasmas.
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