Impurity transport in ITG and TE mode dominated turbulence
Poster (konferens), 2010
The transport properties of impurities is of high relevance
for the performance and optimisation of magnetic fusion
devices. For instance, impurities from plasma-facing surfaces accumulating in the core dilute the plasma and lead
to unacceptable energy loss in the form of radiation.
In the present study, turbulent impurity transport in tokamak plasmas, driven by Ion Temperature Gradient (ITG)
and Trapped Electron (TE) modes, is investigated using
fluid and gyrokinetic models. Quasilinear (QL) results obtained from the GENE code are compared with fluid
results for ITG and TE mode dominated turbulence.
Scalings of the peaking factor with impurity charge (Z) and
various parameters are studied. Of particular interest are
conditions favouring an outward convective impurity flux.