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> | ||
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− | + | <h4>Fit max amplitude histograms and find optimal HV</h4> | |
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+ | <h4>Fit drift time histogram</h4> | ||
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+ | {| 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 | ||
+ | ]] | ||
+ | |} | ||
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+ | <h4>Tracking efficiency plot</h4> | ||
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+ | {| 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 | ||
+ | ]] | ||
+ | |} | ||
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+ | <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