PreAmp tests with premixed 90/10 Ar/CO2 - software threshold
We started at 1450V for premixed 90/10 Ar/CO2 (as that was the optimum HV determined previously) and varied the software acceptance threshold, then repeated for 1475V and 1425V.
In the analysis software, events are required to have a minimum amplitude of (pedestal_mean) + (fADCthreshold)*pedestal_sigma. Tracking efficiency is calculated as (number of events containing valid tracks)/(number of cosmic triggers from the scintillators above and below the prototype).
1450V
Tracking efficiency as a function of fADCthreshold
Max amplitude histograms for fADCthresholds 3, 4
Max amplitude histogram for fADCthreshold 2
1475V
Tracking efficiency as a function of fADCthreshold
Max amplitude histograms for fADCthresholds 3, 4
1425V
Tracking efficiency as a function of fADCthreshold
Max amplitude histograms for fADCthresholds 3, 4
Max amplitude histograms for fADCthreshold 5