  The effect of ASDEX Upgrade (AUG) ELM mitigation coils on fast ion wall loads
was studied with the fast particle following Monte Carlo code ASCOT. Neutral
beam injected (NBI) particles were simulated in two AUG discharges both in the
presence and in the absence of the magnetic field perturbation induced by the
eight newly installed in-vessel coils. In one of the discharges (#26476) beams
were applied individually, making it a useful basis for investigating the
effect of the coils on different beams. However, no ELM mitigation was observed
in #26476, probably due to the low plasma density. Therefore, another discharge
(#26895) demonstrating clear ELM mitigation was also studied. The magnetic
perturbation due to the in-vessel coils has a significant effect on the fast
particle confinement, but only when total magnetic field, $B_{tot}$, is low.
When $B_{tot}$ was high, the perturbation did not increase the losses, but
merely resulted in redistribution of the wall power loads. Hence, it seems to
be possible to achieve ELM mitigation using in-vessel coils, while still
avoiding increased fast ion losses, by simply using a strong $B_{tot}$.
Preliminary comparisons between simulated and experimental Fast Ion Lost
Detector (FILD) signals show a reasonable correspondence.
