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The effect of poloidal asymmetry of impurities on impurity transport drivenby electrostatic turbulence in tokamak plasmas is analyzed. It is found that inthe presence of in-out asymmetric impurity populations the zero-flux impuritydensity gradient (the so-called peaking factor) is significantly reduced. Asign change in the impurity flux may occur if the asymmetry is sufficientlylarge. This may be a contributing reason for the observed outward convection ofimpurities in the presence of radio frequency heating. The effect of in-outasymmetry is most significant in regions with low temperature gradients. In thetrapped electron mode dominated case also an up-down asymmetry can lead to asign change in the peaking factor from positive to negative. The effect of ionparallel compressibility on the peaking factor is significant, and leads topositive peaking factors in regions with high temperature gradients, even inthe presence of in-out asymmetry.

Possible mechanism responsible for observed impurity outward flow under radio frequency heating