Difference between revisions of "CDC signal integration new"
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Another way to find the peak length is to start at the end of the sample window and work towards the first sample, looking for a rise of 10sigma or more between 2 consecutive chunks of 5 samples summed together. Other similar approaches on this page [[CDC_finding_signal_duration | finding signal duration]] | Another way to find the peak length is to start at the end of the sample window and work towards the first sample, looking for a rise of 10sigma or more between 2 consecutive chunks of 5 samples summed together. Other similar approaches on this page [[CDC_finding_signal_duration | finding signal duration]] | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
− | |[[Image:run_31809_pklength_track109.png|thumb| | + | |[[Image:run_31809_pklength_track109.png|thumb|x180px|run 31809 (horizontal)]] |
− | |[[Image:run_31811_pklength_track109.png|thumb| | + | |[[Image:run_31811_pklength_track109.png|thumb|x180px|run 31811 (tilted 30deg)]] |
− | |[[Image:run_31810_pklength_track109.png|thumb| | + | |[[Image:run_31810_pklength_track109.png|thumb|x180px|run 31810 (tilted 45deg)]] |
|} | |} | ||
</div> | </div> | ||
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{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|+Amplitude of first maximum in signal / peak duration (peak length calculated as immediately above) Units of fADC bins/sample | |+Amplitude of first maximum in signal / peak duration (peak length calculated as immediately above) Units of fADC bins/sample | ||
− | |[[Image:run_31809_maxamp_pklength.png|thumb| | + | |[[Image:run_31809_maxamp_pklength.png|thumb|x180px|run 31809 (horizontal)]] |
− | |[[Image:run_31811_maxamp_pklength.png|thumb| | + | |[[Image:run_31811_maxamp_pklength.png|thumb|x180px|run 31811 (tilted 30deg)]] |
− | |[[Image:run_31810_maxamp_pklength.png|thumb| | + | |[[Image:run_31810_maxamp_pklength.png|thumb|x180px|run 31810 (tilted 45deg)]] |
|} | |} | ||
</div> | </div> | ||
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{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|+Drift times for tracked and untracked hits in ch20 | |+Drift times for tracked and untracked hits in ch20 | ||
− | |[[Image:run_31809_dt20.png|thumb| | + | |[[Image:run_31809_dt20.png|thumb|x180px|run 31809 (horizontal)]] |
− | |[[Image:run_31811_dt20.png|thumb| | + | |[[Image:run_31811_dt20.png|thumb|x180px|run 31811 (tilted 30deg)]] |
− | |[[Image:run_31810_dt20.png|thumb| | + | |[[Image:run_31810_dt20.png|thumb|x180px|run 31810 (tilted 45deg)]] |
|} | |} | ||
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{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|+Resolution ch20 | |+Resolution ch20 | ||
− | |[[Image:run_31809_res1.png|thumb| | + | |[[Image:run_31809_res1.png|thumb|x180px|run 31809 (horizontal)]] |
− | |[[Image:run_31811_res1.png|thumb| | + | |[[Image:run_31811_res1.png|thumb|x180px|run 31811 (tilted 30deg)]] |
− | |[[Image:run_31810_res1.png|thumb| | + | |[[Image:run_31810_res1.png|thumb|x180px|run 31810 (tilted 45deg)]] |
|} | |} | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|+Resolution vs drift distance | |+Resolution vs drift distance | ||
− | |[[Image:run_31809_res2.png|thumb| | + | |[[Image:run_31809_res2.png|thumb|x180px|run 31809 (horizontal)]] |
− | |[[Image:run_31811_res2.png|thumb| | + | |[[Image:run_31811_res2.png|thumb|x180px|run 31811 (tilted 30deg)]] |
− | |[[Image:run_31810_res2.png|thumb| | + | |[[Image:run_31810_res2.png|thumb|x180px|run 31810 (tilted 45deg)]] |
|} | |} | ||
Revision as of 12:00, 13 July 2012
Cosmics, 50/50 gas, 2090V
Comparison with old (underpowered preamp) data is at CDC_signal_integration
Run numbers are 31809 (horiz) 31810 (45 deg) and 31811 (30 deg) at 3.0V, 2.09kV
Contents
- 1 Check pedestal width and stability
- 2 Find hit threshold to cut above noise
- 3 Try to calculate dE/dx
- 4 Same data as previous section with path lengths scaled by 1/cos(tilt angle)
- 5 Signal duration (Time over threshold)
- 6 Signal duration (change in gradient)
- 7 dE/dx without trackfitting
- 8 Drift times
- 9 Resolution
Check pedestal width and stability
Find hit threshold to cut above noise
Ratio of fit MPV for horizontal : 30 degr : 45 degr data are 210 : 261 : 317 or 1 : 1.24 : 1.51 Ratio of vertical path lengths should be 1 : 1.15 : 1.41 or 1 : 1.16 : 1.45 after correcting for range of angles due to scintillator height and width.
Data below are for hit threshold 5 x pedestal sigma
Try to calculate dE/dx
Find dE and then divide by track length (calculated in the plane parallel to the endplates). Results should scale with the tilt of the prototype. Try the following for dE:
- (A) integrate signal for 700 ns
- (B) position of first max in amplitude
- (C) integrate signal up to position of first max in amplitude
Ratio of fit MPV for horizontal : 30 degr : 45 degr data are 16.9 : 21.4 : 25.7 or 1 : 1.27 : 1.52 Ratio of vertical path lengths should be 1 : 1.16 : 1.45
Ratio of fit MPV for horizontal : 30 degr : 45 degr data are 40.7 : 54.5 : 69.2 or 1 : 1.34 : 1.70
Same data as previous section with path lengths scaled by 1/cos(tilt angle)
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 45deg 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.
Landau fit MPVs are 16.9 (horizontal), 18.4 (30deg) and 18.1 (45 deg). The ratio of tilted 45deg 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 45deg to horizontal MPV of Landau fitted to (integration to first maximum/tracklength) histogram is 1.07 (old data) and 1.18 (new data).
Signal duration (Time over threshold)
Look at time over threshold...
Search back from end of sample window until ADC value rises above a threshold, tried 3sigma, 5sigma, 8sigma (sigma= pedestal std dev). The initial hit selection is on 5sigma so all events will pass this.
Signal duration (change in gradient)
Another way to find the peak length is to start at the end of the sample window and work towards the first sample, looking for a rise of 10sigma or more between 2 consecutive chunks of 5 samples summed together. Other similar approaches on this page finding signal duration