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| − | The later part of this page is 60/40 being used as a template for the 50/50. New stuff (50/50) is above the line.
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| | 50/50 Ar/CO<sub>2</sub> and cosmics, prototype horizontal | | 50/50 Ar/CO<sub>2</sub> and cosmics, prototype horizontal |
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| | Find out where to take local pedestal. These are plots of change in ADC value vs time relative to the threshold crossing time. | | Find out where to take local pedestal. These are plots of change in ADC value vs time relative to the threshold crossing time. |
| − | Nothing to do with Garfield or tz_add but already have a good default in place (take pedestal at np=13 minisamples before threshold crossing) so small changes here are a fine tuning.
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| | {| border="0" cellpadding="2" | | {| border="0" cellpadding="2" |
| | |+ 2090V 50/50 Change in ADC value vs time relative to the threshold crossing time (in units of 8ns/5) | | |+ 2090V 50/50 Change in ADC value vs time relative to the threshold crossing time (in units of 8ns/5) |
Revision as of 09:12, 22 October 2012
50/50 Ar/CO2 and cosmics, prototype horizontal
2050V, 50/50 gas, prototype horizontal
 Pedestal mean of samples 0-99, ch20, over 1 day |
 Pedestal std. dev. of samples 0-99, ch20, over 1 day |
 Max amplitude ch20, hit threshold 4sigma |
 Max amplitude ch20, hit threshold 5sigma |
2075V, 50/50 gas, prototype horizontal
 Pedestal mean of samples 0-99, ch20, over 1 day |
 Pedestal std. dev. of samples 0-99, ch20, over 1 day |
 Max amplitude ch20, hit threshold 4sigma, excluding last 7k events |
 Max amplitude ch20, hit threshold 5sigma, excluding last 7k events |
2100V, 50/50 gas, prototype horizontal
 Pedestal mean of samples 0-99, ch20, over 1 day |
 Pedestal std. dev. of samples 0-99, ch20, over 1 day |
 Max amplitude ch20, hit threshold 4sigma, excluding first 2k events |
 Max amplitude ch20, hit threshold 5sigma, excluding first 2k events |
2090V, 50/50 gas, prototype horizontal
 Pedestal mean of samples 0-99, ch20, over 1 day |
 Pedestal std. dev. of samples 0-99, ch20, over 1 day |
 Max amplitude ch20, hit threshold 4sigma |
 Max amplitude ch20, hit threshold 5sigma |
Where to start the fit from.
50/50 gas, prototype horizontal, 4sigma (gray) and 5sigma (blue) hit threshold, fit range 6sigma+
 2090V, Landau fits, log likelihood method, fit range starting at 5, 6, 7, 8 x pedestal sigma |
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The fits started at higher amplitude underestimate the width. Fit range starting at 5pedestalsigma has MPV 204.5, Sigma 61.9, MPV/Sigma 3.3.
Fit range starting at 6pedestalsigma has MPV 208.6, Sigma 60.7, MPV/Sigma 3.4.
Fit range starting at 7pedestalsigma has MPV 213.7, Sigma 59.5, MPV/Sigma 3.6.
Use 5pedestalsigma start.
50/50 gas, prototype horizontal, 4sigma (gray) and 5sigma (blue) hit threshold, fit range 5sigma+
 2075V, lines show 99.7%, 99% and 95% of landau summed 0-4000 (51, 66, 95) |
 2090V, lines show 99.7%, 99% and 95% of landau summed 0-4000 (55, 74, 111) |
 2100V, lines show 99.7%, 99% and 95% of landau summed 0-4000 (59, 80, 121) |
50/50 gas, noise std dev 16.5, hit threshold 5x16.5 = 82.5
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Fit MPV
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Fit sigma (FWHM/4)
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Fit 4sigma/MPV
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MPV/sigma
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4045/MPV
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99% point
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97% point
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95% point
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| 2075
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169
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49
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1.16
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3.5
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24
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66
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84
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95
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| 2090
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204
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62
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1.21
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3.3
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20
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74
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97
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111
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| 2100
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225
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69
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1.22
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3.3
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18
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80
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106
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122
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Find out where to take local pedestal. These are plots of change in ADC value vs time relative to the threshold crossing time.
2090V 50/50 Change in ADC value vs time relative to the threshold crossing time (in units of 8ns/5)
 2090V, hit thr 5 ped-sigma |
Mean goes through 0.5 and 1 at -17.2 and -14.4 for thr=5sigma
Drift time for 2090V, hit thresholds 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-17, tz_add=0
 2090V, hit threshold 5sigma, time thresholds 4 and 1 sigma Estimate of t0 is 88 and tmax is 756, difference is 668, straight-line intercept is 79.2, to match histogram fit t0, use tz_add 8.4 |
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Max drift time according to Garfield is 663ns for 50/50 Ar/CO2, 671ns for 49.5/50.5, 678ns for 49/51.
Resolution for 2090V, hit thresholds 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-17, tz_add=8, 50/50 Garfield
 50/50 Garfield, resolution ch 20 |
 50/50 Garfield, resolution vs hit radius |
 50/50 Garfield, resolution ch 20 for tracks of radius 5mm+ |
Resolution for 2090V, hit thresholds 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-17, tz_add=8, 49.7/50.3 Garfield
 49.7/50.3 Garfield, resolution ch 20 |
 49.7/50.3 Garfield, resolution vs hit radius |
 49.7/50.3 Garfield, resolution ch 20 for tracks of radius 5mm+ |
Resolution for 2090V, hit thresholds 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-17, tz_add=8, 49.5/50.5 Garfield
 49.5/50.5 Garfield, resolution ch 20 |
 49.5/50.5 Garfield, resolution vs hit radius |
 49.5/50.5 Garfield, resolution ch 20 for tracks of radius 5mm+ |
Resolution for 2090V, hit thresholds 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-17, tz_add=8, 50/50 Garfield
 50/50 Garfield, resolution vs track radius |
 50/50 Garfield, resolution vs track radius |
Resolution for 2090V, hit thresholds 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-17, tz_add=8, 49.7/50.3 Garfield
 49.7/50.3 Garfield, resolution vs track radius |
 49.7/50.3 Garfield, resolution vs track radius |
Resolution for 2090V, hit thresholds 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-17, tz_add=8, 49.5/50.5 Garfield
 49.5/50.5 Garfield, resolution vs track radius |
 49.5/50.5 Garfield, resolution vs track radius |
Include previously ignored hits which arrived before tzero+tz_add, assign these to a fixed drift time
2090V 49.5/50.5 Garfield etc Resolution for np=17, tz_add=8ns, hits before t-zero reassigned
 tfix = 1000 (ignored), 0, 1ns |
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Fit with sum of 2 gaussians
2090V 49.5/50.5 Garfield etc Resolution for np=17, tz_add=8ns, hits before t-zero reassigned
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Resolution for 2090V, 49.7/50.3 Garfield, hit thresholds 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-17, tz_add=8, tfix=4ns
 49.7/50.3 Garfield, resolution ch 20 |
 49.7/50.3 Garfield, resolution vs hit radius |
 49.7/50.3 Garfield, resolution ch 20 for tracks of radius 5mm+ |
