Difference between revisions of "PreAmp tests with premixed 90/10 Ar/CO2 - software threshold"
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|width="400pt"|[[Image:efficiency_with_threshold_1450V.jpg|thumb|none|400px|Tracking efficiency with software threshold, 1450V, 90/10 premix]] | |width="400pt"|[[Image:efficiency_with_threshold_1450V.jpg|thumb|none|400px|Tracking efficiency with software threshold, 1450V, 90/10 premix]] | ||
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| + | Untracked (all the others are tracked) max amplitude histogram for fADCthreshold 3 | ||
| + | {| border="1" cellpadding="2" | ||
| + | |width="400pt"|[[Image:untracked_amp_thr3_1450V.jpg|thumb|none|400px|Untracked max amplitude histogram, 1450V, 90/10 premix]] | ||
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Max amplitude histograms for fADCthresholds 3, 4 | Max amplitude histograms for fADCthresholds 3, 4 | ||
Revision as of 10:44, 22 July 2010
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. A typical value of pedestal_sigma is 12 channels. 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
Untracked (all the others are tracked) max amplitude histogram for fADCthreshold 3
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
