ADTX Threshold Scan RIKEN/RBRC Itaru Nakagawa 1

Run13 ADTX Threshold Scan March 3, 2013 MUID1D HV=Run12 Nominal Setting MuTrig e-Log entry=#1127 2

Run13 ADTX Threshold Scan Run#Threshold [mV]BBCnVTX [MHz]MUID1D [events] ST-1 Logic MAND MAND MAND MAND MAND MAND MOR MOR MOR MOR MOR MOR MOR 3

Fake Hit Rates (South) Logic=AND2 Logic=OR Octant-3 doesn’t necessarily stands out -> AND2 effect? 4

Sanghwa’s Gap-by-Gap Threshold Scan Feb.2013 South St-1 Oct-2 Gap-2 Noisy 5

Fake Hit Rates (North) Logic=AND2Logic=OR North Station-3 Octant-1 stands out Vertical Axis : (average hits/strip)/total#of_trigger / 106ns [Hz] 6

Inter Station Comparison (South) 7

Inter Station Comparison (North) 8

Accidental Coincidence Fake SG1 Trigger SG1 ~ R_st1 x R_st2 x R_st3 9

Accidental SG1 Prediction 10

Accidental SG1 Prediction North Octant-1 Stands out, but not Octant-4 11

SG1 Rate Octant Fraction (South) Red Dot : Emulator Horizontal Bar : Prediction from Fake Rates Compares Actual SG1 Trigger Rates/oct from Emulator and Prediction from Fake hit rates. Run# : Threshold=20mV 12

SG1 Rate Octant Fraction (North) Red Dot : Emulator Horizontal Bar : Prediction from Fake Rates Run# : Threshold=20mV Disagree more than 3sigma. Both plots are from same data. Why? Deadtime? 13

Inter Station Comparison (South) 14

Inter Station Comparison (North) 15 Normalized

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=

Run12 Eff=95% Config 17

BACKUP 18

(Log) 19

(log) 20