  Power exhaust is one of the major challenges for a future fusion device.
Applying a non-axisymmetric external magnetic perturbation is one technique
that is studied in order to mitigate or suppress large edge localized modes
which accompany the high confinement regime in tokamaks. The external magnetic
perturbation brakes the axisymmetry of a tokamak and leads to a 2D heat flux
pattern on the divertor target. The 2D heat flux pattern at the outer divertor
target is studied on ASDEX Upgrade in stationary L-Mode discharges. The
amplitude of the 2D characteristic of the heat flux depends on the alignment
between the field lines at the edge and the vacuum response of the applied
magnetic perturbation spectrum. The 2D characteristic reduces with increasing
density. The increasing divertor broadening $S$ with increasing density is
proposed as the main actuator. This is supported by a generic model using field
line tracing and the vacuum field approach that is in quantitative agreement
with the measured heat flux. The perturbed heat flux, averaged over a full
toroidal rotation of the magnetic perturbation, is identical to the
non-perturbed heat flux without magnetic perturbation. The transport
qualifiers, power fall-off length $\lambda_q$ and divertor broadening $S$, are
the same within the uncertainty compared to the unperturbed reference. No
additional cross field transport is observed.
