Difference between revisions of "PreAmp tests with premixed 90/10 Ar/CO2 - software threshold"

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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.
 
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.
  
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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 15 channels.  Tracking efficiency is calculated as (number of events containing valid tracks)/(number of cosmic triggers from the scintillators above and below the prototype).  
+
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====
 
====1450V====

Revision as of 09:37, 20 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

Tracking efficiency with software threshold, 1450V, 90/10 premix

Max amplitude histograms for fADCthresholds 3, 4

Max amplitude histogram, software threshold 3, 1450V, 90/10 premix
Max amplitude histogram, software threshold 4, 1450V, 90/10 premix

Max amplitude histogram for fADCthreshold 2

Max amplitude histogram, software threshold 2, 1450V, 90/10 premix

1475V

Tracking efficiency as a function of fADCthreshold

Tracking efficiency with software threshold, 1475V, 90/10 premix

Max amplitude histograms for fADCthresholds 3, 4

Max amplitude histogram, software threshold 3, 1475V, 90/10 premix
Max amplitude histogram, software threshold 4, 1475V, 90/10 premix

1425V

Tracking efficiency as a function of fADCthreshold

Tracking efficiency with software threshold, 1425V, 90/10 premix


Max amplitude histograms for fADCthresholds 3, 4

Max amplitude histogram, software threshold 3, 1425V, 90/10 premix
Max amplitude histogram, software threshold 4, 1425V, 90/10 premix

Max amplitude histograms for fADCthreshold 5

Max amplitude histogram, software threshold 5, 1425V, 90/10 premix
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