Dynamics of heavy impurities in non-linear MHD simulations of sawtoothing tokamak plasmas. (2nd November 2016)

• Record Type: Journal Article
• Authors: Ahn, Jae-H; Garbet, X; Lütjens, H; Guirlet, R
• Is Part Of: Plasma physics and controlled fusion. Volume 58:Number 12(2016:Dec.)
• Publication Date: 2016-11-02
• Subjects: impurity -- Pfirsch–Schlüter -- sawtooth -- nonlinear MHD simulations; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/0741-3335/58/12/125009
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: 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 impurities in the high collisional regime 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.