We think the beam in the ESR is not bunched. There is a clear difference in PMT signal if ions are in the ESR compared to no ions (see screenshot of scaler PMT mid, high level with ions, low level without) but we see no structure of an ion bunch (see screenshot of accumulated bins). 
We also increased the accumulation to 10 injections, still no bunch visible.
We double checked the frequency value of the HF cavity mentioned in the last ELOG entrance.