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Suppress our data? Deepali and Takao. Issue now Event size for HBD is large at HV=3500V –Is not very much appreciated. –Needs to set higher zero-suppression.

Published byNicholas White Modified over 8 years ago

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Presentation on theme: "Suppress our data? Deepali and Takao. Issue now Event size for HBD is large at HV=3500V –Is not very much appreciated. –Needs to set higher zero-suppression."— Presentation transcript:

1 Suppress our data? Deepali and Takao

2 Issue now Event size for HBD is large at HV=3500V –Is not very much appreciated. –Needs to set higher zero-suppression threshold to get the size reduced But, we can not set very higher threshold at the given voltage. –According Ilia’s analysis, the average gain is ~3000. 1.p.e. = 1.6*10^-4[fC] * 3000 / 0.1[fC/ch]= 5ch Typical Pedestal width: 2-2.5ch (See next slides) If we set the threshold 3 sigma above pedestal, we are already cutting 1.p.e. –Current maximum threshold: 8ch.

3 Data used to determine threshold Calibration data taken by Deepali last Saturday. WN WS EN ES Maximum set ~ 8ch even 3*sigma exceeded 8ch The idea was even at gain 5000, 8ch corresponds to 1.p.e. Fiber No.

4 Statistics fiber 22001: WN0/1 131.248 B/evt fiber 22002: WN2/3 1300.096 B/evt fiber 22003: WN4/5 467.776 B/evt fiber 22004: WS0/1 454.912 B/evt fiber 22005: WS2/3 109.456 B/evt fiber 22006: WS4/5 847.504 B/evt fiber 22007: EN0/1 311.92 B/evt fiber 22008: EN2/3 3684.448 B/evt fiber 22009: EN4/5 2981.104 B/evt fiber 22010: ES0/1 2263.312 B/evt fiber 22011: ES2/3 3821.776 B/evt fiber 22012: ES4/5 667.936 B/evt Total: 17041.488 B/evt Threshold: 3sigma, RB fiber 22001: WN0/1 109.312 B/evt fiber 22002: WN2/3 955.552 B/evt fiber 22003: WN4/5 311.92 B/evt fiber 22004: WS0/1 299.104 B/evt fiber 22005: WS2/3 100.816 B/evt fiber 22006: WS4/5 624.448 B/evt fiber 22007: EN0/1 225.856 B/evt fiber 22008: EN2/3 3451.264 B/evt fiber 22009: EN4/5 2589.376 B/evt fiber 22010: ES0/1 1942.144 B/evt fiber 22011: ES2/3 3537.856 B/evt fiber 22012: ES4/5 497.584 B/evt Total: 14645.232 B/evt Threshold: 4sigma, RB Apparently the distribution is not gaussian, which is likely because we are looking at some signal

5 Statistics fiber 22001: WN0/1 139.312 B/evt fiber 22002: WN2/3 886.144 B/evt fiber 22003: WN4/5 472.576 B/evt fiber 22004: WS0/1 489.856 B/evt fiber 22005: WS2/3 110.752 B/evt fiber 22006: WS4/5 599.296 B/evt fiber 22007: EN0/1 290.56 B/evt fiber 22008: EN2/3 2998 B/evt fiber 22009: EN4/5 2158.96 B/evt fiber 22010: ES0/1 1635.04 B/evt fiber 22011: ES2/3 3097.696 B/evt fiber 22012: ES4/5 637.456 B/evt Total: 13515.648 B/evt Threshold: 5sigma for EN2-ES3, RB fiber 22001: WN0/1 127.504 B/evt fiber 22002: WN2/3 1010.704 B/evt fiber 22003: WN4/5 387.232 B/evt fiber 22004: WS0/1 403.984 B/evt fiber 22005: WS2/3 111.904 B/evt fiber 22006: WS4/5 677.488 B/evt fiber 22007: EN0/1 288.064 B/evt fiber 22008: EN2/3 2257.6 B/evt fiber 22009: EN4/5 1886.464 B/evt fiber 22010: ES0/1 1494.112 B/evt fiber 22011: ES2/3 924.592 B/evt fiber 22012: ES4/5 474.016 B/evt Total: 10043.664 B/evt Threshold: 3sigma, FB Even 5sigma is not effective in RB?

6 Compare! fiber 22001: WN0/1 131.248 B/evt fiber 22002: WN2/3 1300.096 B/evt fiber 22003: WN4/5 467.776 B/evt fiber 22004: WS0/1 454.912 B/evt fiber 22005: WS2/3 109.456 B/evt fiber 22006: WS4/5 847.504 B/evt fiber 22007: EN0/1 311.92 B/evt fiber 22008: EN2/3 3684.448 B/evt fiber 22009: EN4/5 2981.104 B/evt fiber 22010: ES0/1 2263.312 B/evt fiber 22011: ES2/3 3821.776 B/evt fiber 22012: ES4/5 667.936 B/evt Total: 17041.488 B/evt fiber 22001: WN0/1 127.504 B/evt fiber 22002: WN2/3 1010.704 B/evt fiber 22003: WN4/5 387.232 B/evt fiber 22004: WS0/1 403.984 B/evt fiber 22005: WS2/3 111.904 B/evt fiber 22006: WS4/5 677.488 B/evt fiber 22007: EN0/1 288.064 B/evt fiber 22008: EN2/3 2257.6 B/evt fiber 22009: EN4/5 1886.464 B/evt fiber 22010: ES0/1 1494.112 B/evt fiber 22011: ES2/3 924.592 B/evt fiber 22012: ES4/5 474.016 B/evt Total: 10043.664 B/evt Threshold: 3sigma, FB Threshold: 3sigma, RB That different between FB and RB!

7 What are between RB and FB? Pedestal Run at RB and FB (East Only) Reverse Bias Forward Bias

8 What are between RB and FB? Event Run at RB and FB, FB is zero-suppressed.. Looks like RB have flatter tail.. (not clear, though) Reverse Bias Forward Bias

9 What would be next? Take FB run with zero suppression off. Obviously, we can not set too high threshold.. If we dump whole West, we can save some event volume.. ~20%? Find hot channels? –Somewhat higher sigma for edge pads. –Set higher thresholds for these pedestal.

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