Difference between revisions of "CDC signal integration"
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− | + | Data below are for hit threshold 5 x pedestal sigma | |
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{| 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 | ||
− | |[[Image:run_31757_integdx.png|thumb| | + | |[[Image:run_31757_integdx.png|thumb|x150px|No tilt, LV 2.7V, HV 2100V]] |
− | |[[Image:run_31765_integdx.png|thumb| | + | |[[Image:run_31765_integdx.png|thumb|x150px|Tilted at 45 degrees, LV 2.7V, HV 2100V]] |
+ | |[[Image:run_31809_integdx.png|thumb|x150px|No tilt, LV 3.0V, HV 2090V]] | ||
+ | |[[Image:run_31810_integdx.png|thumb|x150px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | ||
|} | |} | ||
The ratio of tilted to horizontal integration means is 1.24 whereas the ratio of track length is ~ 1.4. | The ratio of tilted to horizontal integration means is 1.24 whereas the ratio of track length is ~ 1.4. | ||
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{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|+height of first maximum in signal amplitude / track length | |+height of first maximum in signal amplitude / track length | ||
− | |[[Image:run_31757_maxampdx.png|thumb|x250px|No tilt]] | + | |[[Image:run_31757_maxampdx.png|thumb|x250px|No tilt, LV 2.7V, HV 2100V]] |
− | |[[Image:run_31765_maxampdx.png|thumb|x250px|Tilted at 45 degrees]] | + | |[[Image:run_31765_maxampdx.png|thumb|x250px|Tilted at 45 degrees, LV 2.7V, HV 2100V]] |
+ | |[[Image:run_31809_maxampdx.png|thumb|x250px|No tilt, LV 3.0V, HV 2090V]] | ||
+ | |[[Image:run_31810_maxampdx.png|thumb|x250px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | ||
|} | |} | ||
Revision as of 14:10, 2 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
The ratio of tilted to horizontal integration means is 1.24 whereas the ratio of track length is ~ 1.4.
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
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