Cosmics, 50/50 gas, 2090V
Comparison with old (underpowered pream) data is at CDC_signal_integration
Run numbers are 31809 (horiz) 31810 (45 deg) and 31811 (30 deg) at 3.0V, 2.09kV
Pedestal height
 No tilt, LV 3.0V, HV 2090V |
 30 degrees, LV 3.0V, HV 2090V |
 45 degrees, LV 3.0V, HV 2090V |
Pedestal width (std dev of first 100 samples in each event)
 No tilt, LV 3.0V, HV 2090V |
 30 degrees, LV 3.0V, HV 2090V |
 45 degrees, LV 3.0V, HV 2090V |
Histograms of first max in signal amplitude with hit threshold 4 x pedestal sigma
 No tilt, LV 3.0V, HV 2090V |
 30 degrees, LV 3.0V, HV 2090V |
 45 degrees, LV 3.0V, HV 2090V |
Histograms of first max in signal amplitude with hit threshold 5 x pedestal sigma
 No tilt, LV 3.0V, HV 2090V |
 30 degrees, LV 3.0V, HV 2090V |
 45 degrees, LV 3.0V, HV 2090V |
Ratio of fit MPV for horizontal : 30 degr : 45 degr data are 210 : 261 : 317 or 1 : 1.24 : 1.51
Data below are for hit threshold 5 x pedestal sigma
Try to calculate dE/dx...
Track length is calculated in the plane parallel to the endplates (no z information) so I scaled it by the tilt of the prototype for the 45 degree data, the upper cosmic trigger scintillator is high up enough that the cosmics are ~ vertical.
integration from low threshold crossing for next 700ns / track length
 No tilt, LV 3.0V, HV 2090V |
 Tilted at 45 degrees, LV 3.0V, HV 2090V |
The ratio of tilted to horizontal integration means is 1.24 (old data) and 1.28 (new data); it should be 1 (as they are already scaled by track length) so this means the tilted integrations are 25-30% too large.
height of first maximum in signal amplitude / track length
 No tilt, LV 3.0V, HV 2090V |
 Tilted at 45 degrees, LV 3.0V, HV 2090V |
The ratio of tilted to horizontal MPV of Landau fitted to amplitude/track length histogram is 0.99 (old data) and 1.07 (new data).
signal integrated from low threshold crossing to position of first maximum in signal amplitude / track length
 No tilt, LV 3.0V, HV 2090V |
 Tilted at 45 degrees, LV 3.0V, HV 2090V |
The ratio of tilted to horizontal MPV of Landau fitted to (integration to first maximum/tracklength) histogram is 1.07 (old data) and 1.18 (new data).
Look at time over threshold...
Peak duration is # samples after the lower threshold crossing until the ADC value decreases by 2sigma over 2 samples, this is a measure of time over threshold in units of 8ns
Peak duration
 No tilt, LV 3.0V, HV 2090V |
 Tilted at 45 degrees, LV 3.0V, HV 2090V |
Peak duration / track length
 No tilt, LV 3.0V, HV 2090V |
 Tilted at 45 degrees, LV 3.0V, HV 2090V |
Peak duration vs track length
 No tilt, LV 3.0V, HV 2090V |
 Tilted at 45 degrees, LV 3.0V, HV 2090V |
Amplitude (first max) vs track length
 No tilt, LV 3.0V, HV 2090V |
 Tilted at 45 degrees, LV 3.0V, HV 2090V |
Peak length vs first maximum in signal amplitude
 No tilt, LV 3.0V, HV 2090V |
 Tilted at 45 degrees, LV 3.0V, HV 2090V |
