Difference between revisions of "CDC signal integration"
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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. | 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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|[[Image:run_31810_maxampdx.png|thumb|x180px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | |[[Image:run_31810_maxampdx.png|thumb|x180px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | ||
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− | + | 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). | |
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|[[Image:run_31810_intmax1dx.png|thumb|x180px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | |[[Image:run_31810_intmax1dx.png|thumb|x180px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | ||
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− | + | 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... | Look at time over threshold... |
Revision as of 09:33, 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
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.
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.
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).
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