Update `min_photoelectrons` and `min_photons` for LSTN-design. - min_photoelectrons=20 - min_photons=120 This follows discussions with the LST team (Abelardo M).: Quote: > after tuning the light collection efficiency, tune the threshold in mV to make sure it is as low (or lower) as the lowest-threshold data we have. For this we looked at the cosmics rates vs. intensity. Of course that implies some image cleaning, so it might be that for a more aggressive cleaning we might have to reduce even further. The blue spectrum below (left) corresponds to one such low-threshold run, and green dots are proton MC (scaled to account for heavier nuclei, matching the high-intensity part) with 270 mV threshold. From this, we simply decided to go for 230 mV threshold (the right plot shows the effect on gamma MC of three different thresholds). It is not critical if it is too low for most of the data, because anyway we apply later an intensity cut (50 pe for dark data) {width=900 height=491} Quote: > The min_pe was chosen, quite conservatively, as 20. Below are the distributions of true p.e. on the camera for 170 mV (left) and 270 mV(right). I don't have the plot for the used value of 230 mV, but it would shift to lower values by ~16% w.r.t. 270 (and even for 270 there are some events at 25 pe). Probably it would be safe to keep it at 25, but will that help much? Keep in mind that we may want to simulate very large gamma fluxes with very steep spectra (i.e. the BOAT), so these low efficiencies may be compensated by huge fluxes. {width=395 height=262} {width=395 height=262}