Impurity transport in ITG and TE mode dominated turbulence

Paper in proceeding, 2010

The transport properties of impurities is of high relevance for the performance and optimisation of magnetic fusion devices. For instance, if impurities from the plasmafacing surfaces accumulate in the core, wall-impurities of relatively low density suffice to dilute the plasma and lead to unacceptable energy losses in the form of radiation. In the present study, turbulent impurity transport in Deuterium tokamak plasmas, driven by Ion Temperature Gradient (ITG) and Trapped Electron (TE) modes, has been investigated using fluid and gyrokinetic models. The impurity diffusivity (DZ) and convective velocity (VZ) are calculated, and from these the zero-flux peaking factor (PF0) is derived.