Simulations of kinetic neoclassical tungsten transport in AUG with applied 3D magnetic fields, with JOREK

An accumulation of heavy impurities in the tokamak core is detrimental for its performance and can lead to disruption of the plasma. In smaller to medium size tokamaks the effective neoclassical transport in the pedestal is typically radially inwards. In larger tokamaks---e.g. ITER--- where the temperature gradient is higher, the neoclassical transport is predicted to be outwards. The models are derived for axisymmetric quasi-steady-state plasmas. Applied 3D magnetic fields---i.e. Resonant Magnetic Perturbation (RMPs)--- can be used to suppress Edge Localized Modes (ELMs). Experimentally it has been observed in AUG, the use of RMPs enhances the outflow of heavy impurities in the pedestal. However, there is no model which can predict neoclassical heavy impurity transport in these ergodized 3D magnetic fields self-consistently.

This presentation will describe the development of the kinetic particle framework in JOREK to simulate neoclassical transport with ergodized 3D fields. Then, present our first set of time-dependent results on the observed effect of the 3D’ness of the plasma due to RMPs in AUG, general observed transport behavior and also our first tungsten-laser-blow-off simulations.