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Laser blow-off injections of aluminum and tungsten have been performed on theDIII-D tokamak to investigate the variation of impurity transport in a set ofdedicated ion and electron heating scans with a fixed value of the externaltorque. The particle transport is quantified via the Bayesian inference method,which, constrained by a combination of a charge exchange recombinationspectroscopy, soft X-ray measurements, and VUV spectroscopy provides a detaileduncertainty quantification of the transport coefficients. Contrasting dischargephases with a dominant electron and ion heating reveal a factor of 30 increasein midradius impurity diffusion and a 3-fold drop in the impurity confinementtime when additional electron heating is applied. Further, the calculatedstationary aluminum density profiles reverse from peaked in electron heated tohollow in the ion heated case, following a similar trend as electron and carbondensity profiles. Comparable values of a core diffusion have been observed forW and Al ions, while differences in the propagation dynamics of theseimpurities are attributed to pedestal and edge transport. Modeling of the coretransport with non-linear gyrokinetics code CGYRO [J. Candy and E. Belly J.Comput. Phys. 324,73 (2016)], significantly underpredicts the magnitude of thevariation in Al transport. The experiment demonstrates a 3-times steeperincrease of impurity diffusion with additional electron heat flux and 10-timeslower diffusion in ion heated case than predicted by the modeling. However, theCGYRO model correctly predicts that the Al diffusion dramatically increasesbelow the linear threshold for the transition from the ion temperature gradient(ITG) to trapped electron mode (TEM).

The Dependence of the Impurity Transport on the Dominant Turbulent Regime in ELM-y H-mode Discharges