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MuTr HV Optimization

This study aims to identify the optimal high voltage (HV) settings to achieve a noise RMS/MIP peak ratio of 1% for the Muon Tracker (MuTR) at RIKEN. Historically, MuTR has been operated at three standard HV settings. We propose adjusting HV on a channel-by-channel basis to fine-tune the noise distribution, which varies between chambers. Data collection from cosmic events is scheduled from December 23 to January 11, utilizing specified triggers. This will support ongoing HV optimization efforts and ensure effective performance against beam data.

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MuTr HV Optimization

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  1. MuTr HV Optimization RIKEN/RBRC Itaru Nakagawa

  2. Goal • Find out HV to achieve Noise RMS/MIP peak (N/S) = 1%. • Gain can be similar to chambers, but noise distributions are unique from chamber to chamber. • Historically MuTR has been operated with only three HV settings (St1=1875V, St2=1900V, St3=1925V) • Vary HV channel by channel basis to set N/S ~ 1%.

  3. Cosmic Data Taking • Dedicated Measurements : Dec.23 ~ Jan. 11 • MuIDLL1 N1D||S1D trigger : 60Hz ~ 120Hz • Work area: phnxmutr@va020:/data2/SubSystems/phnxmutr/itaru/MipAna • README for instruction Event Selection: Peak Strip ADC of Cluster. No track required.

  4. North Arm

  5. Station-1 Gap-1 Gap-3 Gap-2 Oct.1 Oct.2 Oct.3 Oct.4 Oct.5 Oct.6 Oct.7 Oct.8

  6. Station-2 Gap-1 Gap-3 Gap-2 Oct.1 Oct.2 Oct.3 Oct.4 Oct.5 Oct.6 Oct.7 Oct.8

  7. Station-3 Gap-1 Gap-2 Oct.1 Oct.2 Oct.3 Oct.4 Oct.5 Oct.6 Oct.7 Oct.8

  8. MIP Peak Positions @ Nominal HV oct1 oct2 oct4 oct6 St-1 oct3 oct5 oct7 oct8 gap1 gap2 gap3 St-2 St-3

  9. Pedestal RMS (North Station-1)

  10. Plane Averaged Pedestal RMS [ch] oct1 St-1 oct2 oct4 oct6 oct3 oct5 oct7 oct8 St-2 St-3

  11. Noise RMS/MIP Peak @ Nominal HV St-1 St-2 St-3

  12. N/S .vs Operation Voltage +30V +50V Linear Fit +15V nominal St-1 N/S : 2% -> 1% Needs additional 110V -30V Nominal + Additional Voltage [V] St-2 St-3 Noise RMS / MIP Peak ADC [%]

  13. N/S~1% Required Voltage : Nominal + ?V +50V limit St-1 St-2, St-3 planes are averaged over common HV chain St-2 St-3

  14. South Arm

  15. Station-1 Gap-1 Gap-3 Gap-2 Oct.1 Oct.2 Oct.3 Oct.4 Oct.5 Oct.6 Oct.7 Oct.8

  16. Station-2 Gap-1 Gap-3 Gap-2 Oct.1 Oct.2 Oct.3 Oct.4 Oct.5 Oct.6 Oct.7 Oct.8

  17. Station-3 Gap-1 Gap-2 Oct.1 Oct.2 Oct.3 Oct.4 Oct.5 Oct.6 Oct.7 Oct.8

  18. MIP Peak Positions @ Nominal HV oct1 oct2 oct4 oct6 St-1 oct3 oct5 oct7 oct8 gap1 gap2 gap3 St-2 St-3

  19. Plane Averaged Pedestal RMS oct1 St-1 oct2 oct4 oct6 oct3 oct5 oct7 oct8 St-2 St-3

  20. Noise RMS/MIP Peak @ Nominal HV St-1 St-2 St-3

  21. N/S .vs Operation Voltage +30V +50V +15V Linear Fit nominal St-1 -30V Nominal + Additional Voltage [V] St-2 St-3 Noise RMS / MIP Peak ADC [%]

  22. N/S~1% Suggested Voltage : Nominal + ?V St-1 St-2 St-3

  23. HV Configuration File Copy & paste phoncs@va011:~/hv_stuff/ hvcontrol_MutrN(S)

  24. Study From Run9

  25. HV Set to be N/S ~ 1.5% (North)

  26. Cosmic vs Beam (Absolute)

  27. SN vs HV (North) +50V +25V nominal

  28. Conclusion • MuTr Gain .vs HV were evaluated using HV scan data with cosmic • HVs are optimized to set N/S to be 1%. • New HV will be configured soon. • Will confirm N/S really comes as it desired with further data taking. • Need to confirm with beam data as well.

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