Turbulent particle transport driven by ion and electron modes

Poster (konferens), 2012

The topic of this work is turbulent transport of main ions and impurities driven by ion (ITG) and electron modes (TE and electron scale ETG) in tokamaks. Regions relevant to the pedestal of H-mode plasmas (i.e. steep density gradients) are of particular interest. Using the code GENE, quasilinear (QL) and nonlinear (NL) gyrokinetic simulations are performed. Results are compared with a computation ally efficient fluid model. Transport is quantified by the density gradient of zero particle flux, related to the balance of convection and diffusion. This measure of the impurity peaking is calculated for ITG and TE mode turbulence, and conditions for zero main ion flux is investigated for ETG. Further, the quality of He ash removal is studied.