Dynamics of heavy impurities in non-linear MHD simulations of sawtoothing tokamak plasmas

Jae-H Ahn, X Garbet, H Lütjens, R Guirlet
2016 Plasma Physics and Controlled Fusion  
The effect of sawteeth on impurity dynamics is studied with the XTOR-2F code. Non-linear full 3D MHD simulations including appropriate fluid equations for heavy impurities show that the presence of regular sawtooth crashes affects the impurity behaviour. A spatial non-uniformity of 5% in post-crash impurity density profiles persists due to 2D structures of impurity density which appear during sawtooth crashes. They are shown to be mainly driven by the E × B velocity, and are responsible for the sudden impurity transport in the core plasmas.
doi:10.1088/0741-3335/58/12/125009 fatcat:jtvhmtuby5cqvld4ya2vua5sqe