Ion temperature anisotropy model with cross‐field drifts in the scrape‐off layer

An ion temperature anisotropy model including cross-field drifts has been implemented in the 2D transport code UEDGE. Two ion temperature equations are solved in the model to give separate ion temperatures perpendicular and parallel to the magnetic field, which results in an additional mirror force for ion parallel transport and also leads to an additional curvature drift in the perpendicular direction. In our previous work, an ion temperature anisotropy model was implemented and applied to the full 2D version of UEDGE including recycled neutrals. The simulation results showed that the mirror force due to anisotropy reduces ion parallel flow velocity, however, the simulations were presented without cross-field electric and magnetic drifts. Nevertheless, in present medium-size tokamaks or future compact fusion devices, cross-fields are important. In this work, the anisotropy model is extended to be compatible with the inclusion of cross-field drifts. Preliminary results on comparison between the model solutions with and without cross-field drifts are presented.