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 Before recompile After recompile dat100604/bkp/feeclus02.rootdat100604/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? dat100615/pulse001.cdat Measurements are done without recap clamp

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

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

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

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

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

10. Trigger Timing w/ 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.rootdat100614/feeclus003.root Scintillator HV=-1600V Scintillator HV=-1600V Scintillator HV=-1700V Scintillator HV=-1700V dat100614/feeclus004.root Scintillator HV=-1600V Scintillator HV=-1600V 20k events 500k events 50k events Only ADC2=ADC0 exists in large ADC region. Only ADC2=ADC0 exists in large ADC region. Perhaps chamber penetrated trigger may not cause large pulse in chamber?

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

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

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

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.