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| Try to calculate dE/dx | | Try to calculate dE/dx |
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| + | 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. |
| {| border="0" cellpadding="2" | | {| border="0" cellpadding="2" |
| |+integration from low threshold crossing for next 700ns / track length | | |+integration from low threshold crossing for next 700ns / track length |
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| |[[Image:run_31810_integdx.png|thumb|x180px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | | |[[Image:run_31810_integdx.png|thumb|x180px|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. |
− | 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
| + | |
− | | + | |
− | 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. | + | |
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| {| border="0" cellpadding="2" | | {| border="0" cellpadding="2" |
Revision as of 09:25, 3 July 2012
Cosmics, 50/50 gas, 2100V (left column(s)) 2090 (right column(s))
- Caveat: LHS data were with preamp underpowered, 2.65V on preamp card; RHS data were with 3.0V @ preamp card****
Run numbers are 31757 (horiz) and 31765 (tilt 45deg) at 2.65V, 2.1kV; 31809 (horiz) and 31810 (45 deg) at 3.0V, 2.09kV
Pedestal height
No tilt, LV 2.7V, HV 2100V
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45 degrees, LV 2.7V, HV 2100V
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No tilt, LV 3.0V, HV 2090V
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45 degrees, LV 3.0V, HV 2090V
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Pedestal width (std dev of first 100 samples in each event)
No tilt, LV 2.7V, HV 2100V
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45 degrees, LV 2.7V, HV 2100V
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No tilt, LV 3.0V, HV 2090V
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45 degrees, LV 3.0V, HV 2090V
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Histograms of first max in signal amplitude with hit threshold 4 x pedestal sigma
No tilt, LV 2.7V, HV 2100V
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45 degrees, LV 2.7V, HV 2100V
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No tilt, LV 3.0V, HV 2090V
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45 degrees, LV 3.0V, HV 2090V
|
Histograms of first max in signal amplitude with hit threshold 5 x pedestal sigma
No tilt, LV 2.7V, HV 2100V
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45 degrees, LV 2.7V, HV 2100V
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No tilt, LV 3.0V, HV 2090V
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45 degrees, LV 3.0V, HV 2090V
|
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 2.7V, HV 2100V
|
Tilted at 45 degrees, LV 2.7V, HV 2100V
|
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 2.7V, HV 2100V
|
Tilted at 45 degrees, LV 2.7V, HV 2100V
|
No tilt, LV 3.0V, HV 2090V
|
Tilted at 45 degrees, LV 3.0V, HV 2090V
|
signal integrated from low threshold crossing to position of first maximum in signal amplitude / track length
No tilt, LV 2.7V, HV 2100V
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Tilted at 45 degrees, LV 2.7V, HV 2100V
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No tilt, LV 3.0V, HV 2090V
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Tilted at 45 degrees, LV 3.0V, HV 2090V
|
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 2.7V, HV 2100V
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Tilted at 45 degrees, LV 2.7V, HV 2100V
|
No tilt, LV 3.0V, HV 2090V
|
Tilted at 45 degrees, LV 3.0V, HV 2090V
|
Peak duration / track length
No tilt, LV 2.7V, HV 2100V
|
Tilted at 45 degrees, LV 2.7V, HV 2100V
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No tilt, LV 3.0V, HV 2090V
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Tilted at 45 degrees, LV 3.0V, HV 2090V
|
Peak duration vs track length
No tilt, LV 2.7V, HV 2100V
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Tilted at 45 degrees, LV 2.7V, HV 2100V
|
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 2.7V, HV 2100V
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Tilted at 45 degrees, LV 2.7V, HV 2100V
|
No tilt, LV 3.0V, HV 2090V
|
Tilted at 45 degrees, LV 3.0V, HV 2090V
|