1. ADTX Threshold Scan RIKEN/RBRC Itaru Nakagawa 1

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

3. Run13 ADTX Threshold Scan Run#Threshold [mV]BBCnVTX [MHz]MUID1D [events] ST-1 Logic 385751401.396.5MAND2 385752601.364.5MAND2 385753201.341.6MAND2 385754101.321.3MAND2 3857551001.312.7MAND2 385756801.291.6MAND2 385757801.271.8MOR 3857581001.261.7MOR 385759601.250.5MOR 385760601.241.5MOR 385761401.231.6MOR 385762201.220.3MOR 385763101.220.5MOR 3

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

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

6. 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

7. Inter Station Comparison (South) 7

8. Inter Station Comparison (North) 8

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

10. Accidental SG1 Prediction 10

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

12. 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#385753 : Threshold=20mV 12

13. SG1 Rate Octant Fraction (North) Red Dot : Emulator Horizontal Bar : Prediction from Fake Rates Run#385753 : Threshold=20mV Disagree more than 3sigma. Both plots are from same data. Why? Deadtime? 13

14. Inter Station Comparison (South) 14

15. Inter Station Comparison (North) 15 Normalized

16. 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 16

17. Run12 Eff=95% Config 17

18. BACKUP 18

19. (Log) 19

20. (log) 20