trigger bias study at test bench data riken/rbrc itaru nakagawa
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Trigger Bias Study at Test Bench Data
RIKEN/RBRCItaru Nakagawa
Recompile CodeRecompiled ~/work/Ana/mutrver01 and renewed bin/ and lib directories
Before recompile After recompile
dat100604/bkp/feeclus02.root dat100604/feeclus02.root
They are absolutely identical. Events in fADC[2]<fADC[0] region are still missing.
Timing Tune with Calibration Pulse
Calibration Pulsedefault Reflection?
dat100615/pulse001.cdatdat100615/pulse001.cdat
Measurements are done without recap clamp
Timing Check
dat100615/pulse002.cdat
dat100615/pulse002.cdat
dat100615/pulse003.cdat
dat100615/pulse003.cdat
Timing Check
dat100615/pulse004.cdat
dat100615/pulse004.cdat
dat100615/pulse005.cdat
dat100615/pulse005.cdat
Timing Check
dat100615/pulse006.cdat
dat100615/pulse006.cdat
dat100615/pulse007.cdat
dat100615/pulse007.cdat
Timing Check
dat100615/pulse008.cdat
dat100615/pulse008.cdat
dat100615/pulse009.cdat
dat100615/pulse009.cdat3.8us
3.6ustrigger
Backup Scintillator Trigger
f=+3.5cmr=27.5cm
Chamber
90 Sr
Trigger scintillator
collimator
Trigger scintillator
Trigger Timing w/ 90Srdelay:2BCLK
Back Up Scintillator Trigger
Strip#26 (E47)
Difficult to observe correlated signal with trigger on scope.
ADC[2] .vs ADC[0]
dat100614/feeclus002.root dat100614/feeclus003.root
ScintillatorHV=-1600V
ScintillatorHV=-1700V
dat100614/feeclus004.rootScintillatorHV=-1600V
20k events500k events
50k events
Only ADC2=ADC0 exists in largeADC region.
Perhaps chamber penetrated trigger maynot cause large pulse in chamber?
Timing Tune with Cosmic
data012.cdat
data012.cdat
data013.cdat
3.8us
data013.cdat
Default timing so far.
trigger
Strip 26
More Statistics w/ Cosmic
dat100616/feeclus002.root
500k events3.8us
90Sr Source (Delay=3.8us)
dat100615/feeclus014.root
dat100616/feeclus003.root
ScitillatorHV=-1700VThreshold=-200mV
ScitillatorHV=-1800VThreshold=-100mV
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.