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Optimizing Trigger Timing in Scintillator Experiments: A Calibration Study

This study focuses on the optimization of trigger timing for scintillator detectors using calibration pulses. Multiple measurements were conducted to analyze the timing discrepancies and to ensure the correlation between ADC channels (ADC2 and ADC0). Despite recompiled code and extensive testing, significant regions in fADC remain unobserved. The results highlight uniform distributions of ADC readings below the Minimum Ionizing Particle (MIP) region and establish the calibration methodology for accurate pulse timing. These findings aim to improve the performance and reliability of future experiments.

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Optimizing Trigger Timing in Scintillator Experiments: A Calibration Study

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  1. Trigger Bias Study at Test Bench Data RIKEN/RBRC Itaru Nakagawa

  2. Recompile Code Recompiled ~/work/Ana/mutrver01 and renewed bin/ and lib directories After recompile Before recompile dat100604/bkp/feeclus02.root dat100604/feeclus02.root They are absolutely identical. Events in fADC[2]<fADC[0] region are still missing.

  3. Timing Tune with Calibration Pulse

  4. Calibration Pulse default Reflection? Measurements are done without recap clamp dat100615/pulse001.cdat dat100615/pulse001.cdat

  5. Timing Check dat100615/pulse002.cdat dat100615/pulse002.cdat dat100615/pulse003.cdat dat100615/pulse003.cdat

  6. Timing Check dat100615/pulse004.cdat dat100615/pulse004.cdat dat100615/pulse005.cdat dat100615/pulse005.cdat

  7. Timing Check dat100615/pulse006.cdat dat100615/pulse006.cdat dat100615/pulse007.cdat dat100615/pulse007.cdat

  8. Timing Check trigger 3.6us dat100615/pulse008.cdat dat100615/pulse008.cdat dat100615/pulse009.cdat 3.8us dat100615/pulse009.cdat

  9. Backup Scintillator Trigger collimator 90 Sr Chamber f=+3.5cm r=27.5cm Trigger scintillator Trigger scintillator

  10. Trigger Timingw/ 90Sr delay:2BCLK Back Up Scintillator Trigger Strip#26 (E47) Difficult to observe correlated signal with trigger on scope.

  11. ADC[2] .vs ADC[0] dat100614/feeclus002.root dat100614/feeclus003.root 20k events 500k events Scintillator HV=-1600V Scintillator HV=-1700V Only ADC2=ADC0 exists in large ADC region. dat100614/feeclus004.root Scintillator HV=-1600V 50k events Perhaps chamber penetrated trigger may not cause large pulse in chamber?

  12. Timing Tune with Cosmic Default timing so far. trigger Strip 26 data012.cdat data012.cdat 3.8us data013.cdat data013.cdat

  13. More Statistics w/ Cosmic dat100616/feeclus002.root 500k events 3.8us

  14. 90Sr Source (Delay=3.8us) Scitillator HV=-1700V Threshold=-200mV dat100615/feeclus014.root Scitillator HV=-1800V Threshold=-100mV dat100616/feeclus003.root

  15. Summary • Trigger timing was tuned with calibration pulse. • Scintillator trigger timing was also optimized based on calibration timing (3.8us). • ADC2 .vs ADC0 correlation shows uniform distribution below MIP region (ADC<200). (Should be ADC2~5*ADC0 if correlated timing) • Beyond MIP region, only ADC2=ADC0 events appears. Now understood.

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