Difference between revisions of "CDC signal integration"
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Cosmics, 50/50 gas, 2100V (left column(s)) 2090 (right column(s)) | Cosmics, 50/50 gas, 2100V (left column(s)) 2090 (right column(s)) | ||
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+ | Copied new data onto this page [[CDC_signal_integration_new]] | ||
**** Caveat: LHS data were with preamp underpowered, 2.65V on preamp card; RHS data were with 3.0V @ preamp card**** | **** Caveat: LHS data were with preamp underpowered, 2.65V on preamp card; RHS data were with 3.0V @ preamp card**** | ||
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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 | + | 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" | ||
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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]] | ||
|} | |} | ||
+ | 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]] | ||
|} | |} | ||
+ | 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). | ||
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|[[Image:run_31809_pklength_tracklength.png|thumb|x180px|No tilt, LV 3.0V, HV 2090V]] | |[[Image:run_31809_pklength_tracklength.png|thumb|x180px|No tilt, LV 3.0V, HV 2090V]] | ||
|[[Image:run_31810_pklength_tracklength.png|thumb|x180px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | |[[Image:run_31810_pklength_tracklength.png|thumb|x180px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Amplitude (first max) vs track length | ||
+ | |[[Image:run_31757_maxamp_tracklength.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31765_maxamp_tracklength.png|thumb|x180px|Tilted at 45 degrees, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31809_maxamp_tracklength.png|thumb|x180px|No tilt, LV 3.0V, HV 2090V]] | ||
+ | |[[Image:run_31810_maxamp_tracklength.png|thumb|x180px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | ||
|} | |} | ||
Latest revision as of 11:50, 3 July 2012
Cosmics, 50/50 gas, 2100V (left column(s)) 2090 (right column(s))
Copied new data onto this page CDC_signal_integration_new
- 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