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ADTX Threshold Scan. RIKEN/RBRC Itaru Nakagawa. Run13 ADTX Threshold Scan. March 3, 2013 MUID1D HV=Run12 Nominal Setting MuTrig e-Log entry=#1127. Run13 ADTX Threshold Scan. Fake Hit Rates (South). Logic=AND2. Logic=OR. Logic=OR. Octant-3 doesn’t necessarily stands out

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adtx threshold scan

ADTX Threshold Scan

RIKEN/RBRC

Itaru Nakagawa

run13 adtx threshold scan
Run13 ADTX Threshold Scan
  • March 3, 2013
  • MUID1D
  • HV=Run12 Nominal Setting
  • MuTrige-Log entry=#1127
fake hit rates south
Fake Hit Rates (South)

Logic=AND2

Logic=OR

Logic=OR

Octant-3 doesn’t necessarily stands out

-> AND2 effect?

sanghwa s gap by gap threshold scan
Sanghwa’s Gap-by-Gap Threshold Scan

South St-1 Oct-2

Gap-2 Noisy

Feb.2013

fake hit rates north
Fake Hit Rates (North)

Logic=AND2

Logic=OR

Logic=OR

North Station-3 Octant-1 stands out

Vertical Axis : (average hits/strip)/total#of_trigger / 106ns [Hz]

accidental coincidence fake sg1 trigger
Accidental Coincidence Fake SG1 Trigger
  • SG1 ~ R_st1 x R_st2 x R_st3
accidental sg1 prediction1
Accidental SG1 Prediction

North Octant-1 Stands out, but not Octant-4

sg1 rate octant fraction south
SG1 Rate Octant Fraction (South)

Compares Actual SG1 Trigger Rates/oct from Emulator

and Prediction from Fake hit rates.

Run#385753 : Threshold=20mV

Red Dot : Emulator

Horizontal Bar : Prediction from Fake Rates

sg1 rate octant fraction north
SG1 Rate Octant Fraction (North)

Run#385753 : Threshold=20mV

  • Disagree more than 3sigma.
  • Both plots are from same data. Why?
  • Deadtime?

Red Dot : Emulator

Horizontal Bar : Prediction from Fake Rates

load map to threshold optimization
Load Map to Threshold Optimization
  • Before Run13 : Thresholds are set to be constant charge efficiencies.
  • Run13 Concept
    • R_oct1=R_oct2=R_oct3=…= R_oct8
    • Raise threshold of station which has steeper response to threshold regardless of noisy source St.
  • Analyze Charge efficiency
    • Eff_AND2 -> [1 - (1-eff_g1xeff_g2)x (1-eff_g3)]
      • eff_g? = 0.9 => Eff_AND2=0.98
    • Eff_OR -> [ 1- (1-eff)^2]
      • eff=0.9 => eff_OR=0.99