Difference between revisions of "CDC 55 45"
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55/45 Ar/CO<sub>2</sub> and cosmics, prototype horizontal | 55/45 Ar/CO<sub>2</sub> and cosmics, prototype horizontal | ||
+ | <h4>Short runs for range of HV, check pedestal is ok and find MPV</h4> | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
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|[[Image:run_31929_pedsig.png|thumb|x150px|Pedestal std. dev. of samples 0-99, ch20, over 1 day ]] | |[[Image:run_31929_pedsig.png|thumb|x150px|Pedestal std. dev. of samples 0-99, ch20, over 1 day ]] | ||
|} | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+ 2025V, 55/45 gas, prototype horizontal | ||
+ | |[[Image:run_31930_pedmean.png|thumb|x150px|Pedestal mean of samples 0-99, ch20, over 1 day ]] | ||
+ | |[[Image:run_31930_pedsig.png|thumb|x150px|Pedestal std. dev. of samples 0-99, ch20, over 1 day ]] | ||
+ | |} | ||
+ | |||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
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|} | |} | ||
− | + | <h4>Fit max amplitude histograms and find optimal HV</h4> | |
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|+ 55/45 gas, prototype horizontal, 4pedestalsigma (gray) and 5pedestalsigma (blue) hit threshold, fit range 5pedestalsigma+ | |+ 55/45 gas, prototype horizontal, 4pedestalsigma (gray) and 5pedestalsigma (blue) hit threshold, fit range 5pedestalsigma+ | ||
|[[Image:run_31929_ampfitz.png|thumb|x250px|2000V, lines show 99.7%, 99% and 95% of landau summed 0-4000 (47, 60, 85)]] | |[[Image:run_31929_ampfitz.png|thumb|x250px|2000V, lines show 99.7%, 99% and 95% of landau summed 0-4000 (47, 60, 85)]] | ||
+ | |[[Image:run_31930_ampfitz.png|thumb|x250px|2025V, lines show 99.7%, 99% and 95% of landau summed 0-4000 (49, 65, 98)]] | ||
|[[Image:run_31928_ampfitz.png|thumb|x250px|2050V, lines show 99.7%, 99% and 95% of landau summed 0-4000 (65, 88, 134)]] | |[[Image:run_31928_ampfitz.png|thumb|x250px|2050V, lines show 99.7%, 99% and 95% of landau summed 0-4000 (65, 88, 134)]] | ||
− | |[[Image:run_31927_ampfitz.png|thumb|x250px|2100V, lines show 99.7%, 99% and 95% of landau summed 0-4000 ()]] | + | |[[Image:run_31927_ampfitz.png|thumb|x250px|2100V, lines show 99.7%, 99% and 95% of landau summed 0-4000 (94, 130, 201)]] |
|} | |} | ||
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! Fit MPV | ! Fit MPV | ||
! Fit sigma (FWHM/4) | ! Fit sigma (FWHM/4) | ||
+ | ! Fit 4sigma/MPV | ||
! MPV/sigma | ! MPV/sigma | ||
− | |||
! 4045/MPV | ! 4045/MPV | ||
+ | ! 99% point | ||
+ | ! 97% point | ||
+ | ! 95% point | ||
|- | |- | ||
| 2000 | | 2000 | ||
| 149 | | 149 | ||
| 42 | | 42 | ||
− | | 3.5 | + | | 1.14 |
− | | 60 | + | | 3.5 |
− | | | + | |27 |
+ | |60 | ||
+ | |76 | ||
+ | |style="background:#CFF" | 85 | ||
+ | |- | ||
+ | | 2025 | ||
+ | | 181 | ||
+ | | 55 | ||
+ | | 1.21 | ||
+ | | 3.3 | ||
+ | | 22 | ||
+ | | 65 | ||
+ | |style="background:#CFF" |86 | ||
+ | | 98 | ||
|- | |- | ||
| 2050 | | 2050 | ||
− | | 251 | + | | 251 |
| 77 | | 77 | ||
− | | 3.2 | + | | 1.23 |
− | | 88 | + | | 3.2 |
− | | | + | |16 |
+ | |style="background:#CFF" |88 | ||
+ | |117 | ||
+ | |134 | ||
|- | |- | ||
| 2100 | | 2100 | ||
− | | | + | | 380 |
− | | | + | | 119 |
− | | | + | | 1.25 |
− | | | + | | 3.2 |
− | | | + | |11 |
+ | |130 | ||
+ | |174 | ||
+ | |201 | ||
|} | |} | ||
+ | |||
+ | |||
+ | |||
+ | <h4>Fit drift time histogram</h4> | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+ Drift time for 2050V, hit thresholds 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(t4sig)-13, tz_add=0 | ||
+ | |width="400px"| | ||
+ | |[[Image:run_31931_dt20.png|thumb|x250px|2050V, hit threshold 5sigma, time thresholds 4 and 1 sigma | ||
+ | Estimate of t0 is 104 and tmax is 727, difference is 622, diff between fit maximum and fit t0 is 6.0, straight-line intercept is 95.6, to match histogram fit t0, use tz_add 8.8 | ||
+ | ]] | ||
+ | |} | ||
+ | |||
+ | |||
+ | <h4>Tracking efficiency plot</h4> | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+ Tracks/Triggers, hit thresholds 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-17 | ||
+ | |[[Image:eff_hv_5545_Oct2012_tf88_tfix1000_np17.png|thumb|x250px| tzero=88ns, early hits ignored | ||
+ | ]] | ||
+ | |} | ||
+ | |||
+ | |||
+ | <h4>Look at position resolution, find best gas mix for Garfield x-t tables</h4> |
Latest revision as of 13:59, 18 March 2014
55/45 Ar/CO2 and cosmics, prototype horizontal
Contents
Short runs for range of HV, check pedestal is ok and find MPV
Fit max amplitude histograms and find optimal HV
HV | Fit MPV | Fit sigma (FWHM/4) | Fit 4sigma/MPV | MPV/sigma | 4045/MPV | 99% point | 97% point | 95% point |
---|---|---|---|---|---|---|---|---|
2000 | 149 | 42 | 1.14 | 3.5 | 27 | 60 | 76 | 85 |
2025 | 181 | 55 | 1.21 | 3.3 | 22 | 65 | 86 | 98 |
2050 | 251 | 77 | 1.23 | 3.2 | 16 | 88 | 117 | 134 |
2100 | 380 | 119 | 1.25 | 3.2 | 11 | 130 | 174 | 201 |
Fit drift time histogram
Tracking efficiency plot