Angular momentum transport modeling: achievements of a gyrokinetic quasi-linear approach

QuaLiKiz, a model based on a local gyrokinetic eigenvalue solver[1] is expanded to include momentum flux modeling in addition to heat and particle fluxes[2, 3]. Essential for accurate momentum flux predictions, the parallel asymmetrization of the eigenfunctions is successfully recovered by an analytical fluid model. This is tested against self-consistent gyro-kinetic calculations and allows for a correct prediction of the E × B shear impact on the saturated potential amplitude by means of a mixing length rule. Hence, the effect of the E × B shear is recovered on all the transport channels including the induced residual stress. Including these additions, QuaLiKiz remains ∼ 10000 faster than non-linear gyro-kinetic codes allowing for comparisons with experiments without resorting to High Performance Computing. The example is given of momentum pinch calculations in NBI modulation experiments[4] for which the inward convection of the momentum is correctly predicted. PACS numbers: 52.25.Fi, 52.30.Gz, 52.35.-g, 52.35.Ra, 52.55.Fa, 52.65.-y, 52.65.Tt, 52.65.Vv Angular momentum transport modeling: achievements of a gyrokinetic quasi-linear approach2