Neoclassical impurity flux in presence of turbulent generated poloidal asymmetries and pressure anisotropy

Peter Donnel (1) , Xavier Garbet (1) , Yanick Sarazin (1) , Virginie Grandgirard (1) , Nicolas Bouzat (2) , Elisabetta Caschera (1) , Guilhem Dif-Pradalier (1) , Philippe Ghendrih (1) , Camille Gillot (1, 3) , Guillaume Latu (4) , Chantal Passeron (1)

1 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
2 MDLS - Maison de la Simulation
3 ENPC - École des Ponts ParisTech
4 CEA - Commissariat à l'énergie atomique et aux énergies alternatives

Poloidal asymmetries of impurities are commonly observed experimentally. Density asymmetry is already known to impact significantly the neoclassical prediction of impurity fluxes. In this article, the effect of impurity pressure asymmetry and anisotropy on the neoclassical flux of impurity is derived analytically. This prediction is compared with simulations performed with the gyrokinetic code GYSELA, featuring both turbulent and neoclassical transports. A fair agreement is found between the analytical prediction and the result of the simulation. On the special cases which are considered, the effects of impurity pressure asymmetry and anisotropy are shown to play a prominent role in the modification of the neoclassical impurity transport.

Domaines: Physique des plasmas [physics.plasm-ph]

Peter Donnel, Xavier Garbet, Yanick Sarazin, Virginie Grandgirard, Nicolas Bouzat, et al.. Neoclassical impurity flux in presence of turbulent generated poloidal asymmetries and pressure anisotropy. Plasma Physics and Controlled Fusion, 2019, 61 (4), pp.044006. ⟨10.1088/1361-6587/ab04b8⟩. ⟨hal-01882274⟩