Difference between revisions of "CDC 50 50"
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|[[Image:run_31942_5025-4975-295K-np16-tz7-tfix1000-resx20.png|thumb|x250px|50.25/49.75 Garfield, resolution vs hit radius]] | |[[Image:run_31942_5025-4975-295K-np16-tz7-tfix1000-resx20.png|thumb|x250px|50.25/49.75 Garfield, resolution vs hit radius]] | ||
|[[Image:run_31942_5025-4975-295K-np16-tz7-tfix1000-res20_5mm.png|thumb|x250px|50.25/49.75 Garfield, resolution ch 20 for tracks of radius 5mm+]] | |[[Image:run_31942_5025-4975-295K-np16-tz7-tfix1000-res20_5mm.png|thumb|x250px|50.25/49.75 Garfield, resolution ch 20 for tracks of radius 5mm+]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+ Resolution for 2100V, 50.25/49.75 Garfield (295K), hit threshold 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-16, tz_add=7, early hits ignored (same as previous, updated tracking code) | ||
+ | |[[Image:run_31942_tr127_5025-4975-295K-np16-tz7-tfix1000-res20.png|thumb|x250px|50.25/49.75 Garfield, resolution ch 20]] | ||
+ | |[[Image:run_31942_tr127_5025-4975-295K-np16-tz7-tfix1000-resx20.png|thumb|x250px|50.25/49.75 Garfield, resolution vs hit radius]] | ||
+ | |[[Image:run_31942_tr127_5025-4975-295K-np16-tz7-tfix1000-res20_5mm.png|thumb|x250px|50.25/49.75 Garfield, resolution ch 20 for tracks of radius 5mm+]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+ Resolution for 2100V, 50.25/49.75 Garfield (295K), hit threshold 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-16, tz_add=7, early hits ignored | ||
+ | |[[Image:run_31942_tr127_5025-4975-295K-np16-tz7-tfix1000-xchunks.png|thumb|x250px|50.25/49.75 Garfield, resolution vs track radius]] | ||
+ | |[[Image:run_31942_tr127_5025-4975-295K-np16-tz7-tfix1000-xchunks8.png|thumb|x250px|50.25/49.75 Garfield, resolution vs track radius]] | ||
+ | |} | ||
+ | |||
+ | <h4>2100V - Reassign pre-tzero hits</h4> | ||
+ | |||
+ | Include previously ignored hits which arrived before tzero+tz_add, assign these to a fixed drift time | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+ 2100V 50.25/49.75 Garfield etc Resolution for np=16, tz_add=7ns, hits before t-zero reassigned | ||
+ | |[[Image:run_31942_tfix_1000_0_1.png|thumb|x250px|tfix = 1000 (ignored), 0, 1ns]] | ||
+ | |[[Image:run_31942_tfix_1_2_3.png|thumb|x250px|tfix = 1, 2, 3ns]] | ||
+ | |} | ||
+ | |||
+ | Fit with sum of 2 gaussians | ||
+ | {| border="0" cellpadding="2" | ||
+ | |+ 2100V 50.25/49.75 Garfield etc Resolution for np=16, tz_add=7ns, hits before t-zero reassigned | ||
+ | |[[Image:run_31942_2gaus_tfix1.png|thumb|x250px|tfix = 1ns]] | ||
+ | |[[Image:run_31942_2gaus_tfix2.png|thumb|x250px|tfix = 2ns]] | ||
+ | |[[Image:run_31942_2gaus_tfix3.png|thumb|x250px|tfix = 3ns]] | ||
+ | |- | ||
+ | |[[Image:run_31942_2gaus_tfix4.png|thumb|x250px|tfix = 4ns]] | ||
+ | |[[Image:run_31942_2gaus_tfix5.png|thumb|x250px|tfix = 5ns]] | ||
+ | |[[Image:run_31942_2gaus_tfix6.png|thumb|x250px|tfix = 6ns]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+ Resolution for 2100V, 50.25/49.75 Garfield (295K), hit threshold 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-16, tz_add=7, tfix=2 | ||
+ | |[[Image:run_31942_5025-4975-295K-np16-tz7-tfix2-res20.png|thumb|x250px|50.25/49.75 Garfield, resolution ch 20]] | ||
+ | |[[Image:run_31942_5025-4975-295K-np16-tz7-tfix2-resx20.png|thumb|x250px|50.25/49.75 Garfield, resolution vs hit radius]] | ||
+ | |[[Image:run_31942_5025-4975-295K-np16-tz7-tfix2-res20_5mm.png|thumb|x250px|50.25/49.75 Garfield, resolution ch 20 for tracks of radius 5mm+]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+ Resolution for 2100V, 50.25/49.75 Garfield (295K)hit threshold 5sigma, timing thresholds 4sigma, 1sigma, pedestal at t(5sig)-16, tz_add=7, tfix=2 | ||
+ | |[[Image:run_31942_5025-4975-295K-np16-tz7-tfix2-xchunks.png|thumb|x250px|50.5/49.5 Garfield, resolution vs track radius]] | ||
+ | |[[Image:run_31942_5025-4975-295K-np16-tz7-tfix2-xchunks8.png|thumb|x250px|50.5/49.5 Garfield, resolution vs track radius]] | ||
|} | |} |
Latest revision as of 15:58, 12 February 2013
50/50 Ar/CO2 and cosmics, prototype horizontal
Contents
- 1 Short runs for range of HV, check pedestal is ok and find MPV
- 2 Fit max amplitude histograms and find optimal HV
- 3 2090V - Find best point to take as local pedestal
- 4 Fit drift time histogram and find t-zero
- 5 Tracking efficiency plot
- 6 Look at position resolution, find best gas mix for Garfield x-t tables
- 7 Reassign pre-tzero hits
- 8 2100V - Check pedestal is ok and find MPV
- 9 2100V - Find best point to take as local pedestal
- 10 2100V - Fit drift time histogram and find t-zero
- 11 2100V - Look at position resolution, find best gas mix for Garfield x-t tables
- 12 2100V - Reassign pre-tzero hits
Short runs for range of HV, check pedestal is ok and find MPV
Fit max amplitude histograms and find optimal HV
Where to start the fit from.
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.
HV | Fit MPV | Fit sigma (FWHM/4) | Fit 4sigma/MPV | MPV/sigma | 4045/MPV | 99% point | 97% point | 95% point |
---|---|---|---|---|---|---|---|---|
2075 | 169 | 49 | 1.16 | 3.5 | 24 | 66 | 84 | 95 |
2090 | 204 | 62 | 1.21 | 3.3 | 20 | 74 | 97 | 111 |
2100 | 225 | 69 | 1.22 | 3.3 | 18 | 80 | 106 | 122 |
2090V - Find best point to take as local pedestal
Find out where to take local pedestal. These are plots of change in ADC value vs time relative to the threshold crossing time.
Mean goes through 0.5 and 1 at -17.2 and -14.4 for thr=5sigma
Fit drift time histogram and find t-zero
Max drift time according to Garfield is 663ns for 50/50 Ar/CO2, 671ns for 49.5/50.5, 678ns for 49/51.
Tracking efficiency plot
Look at position resolution, find best gas mix for Garfield x-t tables
Find gas mix which puts the mean residuals for the tracks with drift distance 5mm+ closest to zero
Reassign pre-tzero hits
Include previously ignored hits which arrived before tzero+tz_add, assign these to a fixed drift time
Fit with sum of 2 gaussians
Ar(%) | CO2(%) | tmax(ns) |
---|---|---|
49.0 | 51.0 | 691 |
49.1 | 50.9 | 688 |
49.2 | 50.8 | 688 |
49.3 | 50.7 | 686 |
49.4 | 50.6 | 684 |
49.5 | 50.5 | 683 |
49.6 | 50.4 | 682 |
49.7 | 50.3 | 679 |
49.8 | 50.2 | 679 |
49.9 | 50.1 | 675 |
50.0 | 50.0 | 676 |
Ar(%) | CO2(%) | tmax(ns) |
---|---|---|
50.0 | 50.0 | 676 |
50.25 | 49.75 | 674 |
50.5 | 49.5 | 668 |
50.75 | 49.25 | 666 |
51.0 | 49.0 | 661 |
Try 50.5/49.5 to match tmax of 668 from drift time fit
Fit with sum of 2 gaussians
2100V - Check pedestal is ok and find MPV
2100V - Find best point to take as local pedestal
Find out where to take local pedestal. These are plots of change in ADC value vs time relative to the threshold crossing time.
mean adc change 0.5 at -16.6 and 1 at -14
2100V - Fit drift time histogram and find t-zero
2100V - Look at position resolution, find best gas mix for Garfield x-t tables
Ar(%) | CO2(%) | tmax(ns) |
---|---|---|
49.75 | 50.25 | 678 |
50.0 | 50.0 | 672 |
50.25 | 49.75 | 672 |
50.75 | 49.25 | 663 |
2100V - Reassign pre-tzero hits
Include previously ignored hits which arrived before tzero+tz_add, assign these to a fixed drift time
Fit with sum of 2 gaussians