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Analysis of Zero-Suppression Thresholds and Pedestal Widths in High Voltage Event Sizing

This document discusses the current challenges and considerations in setting zero-suppression thresholds for high-voltage events (HV=3500V) observed during analysis by Deepali and Takao. The gain is found to be approximately 3000 at 1 p.e., which is critical for determining appropriate thresholds to reduce event size without significantly cutting useful data. The analysis highlights statistical thresholds, fiber data, and complications related to Gaussian distribution versus signal observation, alongside recommendations for the next steps in data collection and threshold adjustment.

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Analysis of Zero-Suppression Thresholds and Pedestal Widths in High Voltage Event Sizing

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  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 Threshold: 3sigma, RB Threshold: 4sigma, RB 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: WN0/1 109.312 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 Apparently the distribution is not gaussian, which is likely because we are looking at some signal

  5. Statistics Threshold: 5sigma for EN2-ES3, RB Threshold: 3sigma, FB 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 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 Even 5sigma is not effective in RB?

  6. Compare! Threshold: 3sigma, RB Threshold: 3sigma, FB 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 That different between FB and RB!

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

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

  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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