Difference between revisions of "CDC signal integration"
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|} | |} | ||
| − | + | Try to calculate dE/dx | |
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
| − | |+ | + | |+integration from low threshold crossing for next 700ns / track length |
|[[Image:run_31757_integdx.png|thumb|x250px|No tilt]] | |[[Image:run_31757_integdx.png|thumb|x250px|No tilt]] | ||
|[[Image:run_31765_integdx.png|thumb|x250px|Tilted at 45 degrees]] | |[[Image:run_31765_integdx.png|thumb|x250px|Tilted at 45 degrees]] | ||
|} | |} | ||
| + | This does not scale very nicely with track length. | ||
| + | |||
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 | 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 | ||
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|[[Image:run_31757_maxampdx.png|thumb|x250px|No tilt]] | |[[Image:run_31757_maxampdx.png|thumb|x250px|No tilt]] | ||
|[[Image:run_31765_maxampdx.png|thumb|x250px|Tilted at 45 degrees]] | |[[Image:run_31765_maxampdx.png|thumb|x250px|Tilted at 45 degrees]] | ||
| + | |} | ||
| + | |||
| + | |||
| + | {| border="0" cellpadding="2" | ||
| + | |+signal integrated from low threshold crossing to position of first maximum in signal amplitude / track length | ||
| + | |[[Image:run_31757_intmax1dx.png|thumb|x250px|No tilt]] | ||
| + | |[[Image:run_31765_intmax1dx.png|thumb|x250px|Tilted at 45 degrees]] | ||
|} | |} | ||
Revision as of 16:04, 14 June 2012
Peak length 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
50/50 gas, 2100V
- Caveat: data were with preamp underpowered, 2.65V on preamp card ****
Try to calculate dE/dx
This does not scale very nicely with track length.
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
