Difference between revisions of "CDC signal integration"
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− | + | 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 | ||
− | |||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
− | |+ | + | |+Pedestal height |
− | |[[Image: | + | |[[Image:run_31757_ped20.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] |
− | |[[Image: | + | |[[Image:run_31765_ped20.png|thumb|x180px|45 degrees, LV 2.7V, HV 2100V]] |
+ | |[[Image:run_31809_ped20.png|thumb|x180px|No tilt, LV 3.0V, HV 2090V]] | ||
+ | |[[Image:run_31810_ped20.png|thumb|x180px|45 degrees, LV 3.0V, HV 2090V]] | ||
|} | |} | ||
+ | {| border="0" cellpadding="2" | ||
+ | |+Pedestal width (std dev of first 100 samples in each event) | ||
+ | |[[Image:run_31757_sig20.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31765_sig20.png|thumb|x180px|45 degrees, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31809_sig20.png|thumb|x180px|No tilt, LV 3.0V, HV 2090V]] | ||
+ | |[[Image:run_31810_sig20.png|thumb|x180px|45 degrees, LV 3.0V, HV 2090V]] | ||
+ | |} | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
− | |+ | + | |+Histograms of first max in signal amplitude with hit threshold 4 x pedestal sigma |
− | |[[Image: | + | |[[Image:run_31757_thr4_maxamp20.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] |
− | |[[Image: | + | |[[Image:run_31765_thr4_maxamp20.png|thumb|x180px|45 degrees, LV 2.7V, HV 2100V]] |
+ | |[[Image:run_31809_thr4_maxamp20.png|thumb|x180px|No tilt, LV 3.0V, HV 2090V]] | ||
+ | |[[Image:run_31810_thr4_maxamp20.png|thumb|x180px|45 degrees, LV 3.0V, HV 2090V]] | ||
|} | |} | ||
− | 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" |
+ | |+Histograms of first max in signal amplitude with hit threshold 5 x pedestal sigma | ||
+ | |[[Image:run_31757_thr5_maxamp20.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31765_thr5_maxamp20.png|thumb|x180px|45 degrees, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31809_thr5_maxamp20.png|thumb|x180px|No tilt, LV 3.0V, HV 2090V]] | ||
+ | |[[Image:run_31810_thr5_maxamp20.png|thumb|x180px|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. | ||
+ | {| border="0" cellpadding="2" | ||
+ | |+integration from low threshold crossing for next 700ns / track length | ||
+ | |[[Image:run_31757_integdx.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31765_integdx.png|thumb|x180px|Tilted at 45 degrees, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31809_integdx.png|thumb|x180px|No tilt, 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. | ||
+ | |||
{| 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| | + | |[[Image:run_31757_maxampdx.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] |
− | |[[Image:run_31765_maxampdx.png|thumb| | + | |[[Image:run_31765_maxampdx.png|thumb|x180px|Tilted at 45 degrees, LV 2.7V, HV 2100V]] |
+ | |[[Image:run_31809_maxampdx.png|thumb|x180px|No tilt, 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). | ||
+ | |||
+ | |||
+ | {| 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|x180px|No tilt, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31765_intmax1dx.png|thumb|x180px|Tilted at 45 degrees, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31809_intmax1dx.png|thumb|x180px|No tilt, 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). | ||
+ | |||
+ | |||
+ | |||
+ | 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 | ||
+ | |||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Peak duration | ||
+ | |[[Image:run_31757_pklength.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31765_pklength.png|thumb|x180px|Tilted at 45 degrees, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31809_pklength.png|thumb|x180px|No tilt, LV 3.0V, HV 2090V]] | ||
+ | |[[Image:run_31810_pklength.png|thumb|x180px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | ||
+ | |} | ||
+ | |||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Peak duration / track length | ||
+ | |[[Image:run_31757_pklengthdx.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31765_pklengthdx.png|thumb|x180px|Tilted at 45 degrees, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31809_pklengthdx.png|thumb|x180px|No tilt, LV 3.0V, HV 2090V]] | ||
+ | |[[Image:run_31810_pklengthdx.png|thumb|x180px|Tilted at 45 degrees, LV 3.0V, HV 2090V]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Peak duration vs track length | ||
+ | |[[Image:run_31757_pklength_tracklength.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31765_pklength_tracklength.png|thumb|x180px|Tilted at 45 degrees, LV 2.7V, HV 2100V]] | ||
+ | |[[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]] | ||
+ | |} | ||
+ | |||
+ | {| 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]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Peak length vs first maximum in signal amplitude | ||
+ | |[[Image:run_31757_pklength_maxamp.png|thumb|x180px|No tilt, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31765_pklength_maxamp.png|thumb|x180px|Tilted at 45 degrees, LV 2.7V, HV 2100V]] | ||
+ | |[[Image:run_31809_pklength_maxamp.png|thumb|x180px|No tilt, LV 3.0V, HV 2090V]] | ||
+ | |[[Image:run_31810_pklength_maxamp.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