9  V scan (gain from ThGEM) In this set-up: Electrons collected by anode E drift (fixed) = 0 V/cm (but we measured I anode to be insensitive to E drift ) E induction (fixed) = 4000 V/cm Scan in  V, until multiplication occurs The graph shows three regions:  V < 250 : partial collection of electrons inside the holes 250 V <  V < 1000 V : enhanced collection inside holes but gain still ~ 1  V > 1000 V : multiplication (we gain a factor 2 every 80 V) In the last points the currents are huge (and time dependent) so we don't stay for long times.