I am using FTPC hits to study the hit density in the forward region. For this I use files from run 7145009, where the BBC coincidence rates were around 500 kHz. The hit density is given in hits /cm^2 per event, where only events with FTPC hits are counted. I have two sets of plots, one for FTPC hits called "good", which are high-quality hits, and one called "all", which are all hits. I have to investigate what the difference really means. Anyway, here are plots for the west side, at a z of around 170 cm for zero bias events:

Good FTPC hits:

All FTPC Hits:

For triggered data (all triggers with slow detectors) the situation essentially is the same as for zero bias events.

Now, concerning the interpretation of these results of course one has to keep in mind that these include pile-up. The readout time of the FTPC is around 40 us, so in principle the pile-up is integrated over ~360 bunch crossings. The FGT readout is much faster ~a few 100 ns, so the occupancy of the FGT will be significantly less than the FGT at the same luminosity.