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Run12 MuTR HV Optimization

Run12 MuTR HV Optimization. RIKEN/RBRC Itaru Nakagawa. ADC Distribution. Landau Distribution. Most Probable Value (MPV) Of Minimum Ionization Particle (MIP). Resolution vs. S/N Relation. Resolution. N/S. Goal : Getting Position Resolution of 100 ~ 150 m m! Reduce Noise (Pedestal RMS)

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Run12 MuTR HV Optimization

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  1. Run12 MuTR HV Optimization RIKEN/RBRC Itaru Nakagawa

  2. ADC Distribution Landau Distribution Most Probable Value (MPV) Of Minimum Ionization Particle (MIP)

  3. Resolution vs. S/N Relation Resolution N/S Goal : Getting Position Resolution of 100 ~ 150 mm! Reduce Noise (Pedestal RMS) Increase Signal -> Increase Gain (HV, Gas)

  4. Run12 MuTR HV Scan Executed Feb. 14, 2012. 200GeV pp Ar : CO2 : CF4 = 52 : 29.4 : 18.6 (analysis result from Atlantic Analysis Lab. March,7,2012) ADTX : LV on (-20 ADC channel in MIP)

  5. HV Scan Conditions • Run9 vs. Run12 • North should be +20% increase in ADC channel • South should be similar gain.

  6. North Gain Comparison DADC=p0+p1*DV+p2**DV No advantage seen for +2% increase of Ar gas MPV [ADC channel]

  7. South Gain Comparison -20ch for Run12 Due to ADTX on Overall, MuTR Gain seems lower than that of Run11

  8. North Arm

  9. North Station-1 Landau Fit

  10. North Station-2 Landau Fit

  11. North Station-3 Landau Fit

  12. North 200GeV pp Gap-by-Gap MPV HV setting : -25V of Run11 500GeV ppHV setting Gap-2 Station-1 Gap-3 Gap-1 Oct-1 Oct-2 Oct-3 Oct-4 Station-2 Station-3

  13. North Run11 Gain vs. Run12 200GeV pp

  14. North St-1 Pedestal Distribution (Oct.17,2011) Plane-3 Plane-1 Plane-2 Plane-6 Plane-4 Plane-5 Oct.1 Oct.2 Oct.3 Oct.4 Ground cables Oct.5 Oct.6 Oct.7 Oct.8 Noise Level is Significantly Improved, by fixing anode ground cables.

  15. Plane Averaged North Pedestals for Run12 Station-1 Pedestal Level = 1.5 ~ 2.5 Station-2 Pedestal RMS [ADC channel] Station-3

  16. Additional HV to achieve N/S=1.3% Additional DV to Achieve N/S => 1.3%

  17. South Arm

  18. South Station-1 Landau Fit

  19. South Station-2 Landau Fit

  20. South Station-3 Landau Fit Low Gain

  21. South 200GeV pp Gap-by-Gap MPV HV setting : -25V of Run11 500GeV ppHV setting Gap-2 Station-1 Gap-3 Gap-1 Oct-1 Oct-2 Oct-3 Oct-4 Station-2 Station-3 Low gain

  22. South Run11 MPV vs. Run12 200GeV-pp Low gain from past

  23. South Pedestal RMS Run12 Station-1 Average ~ 2 ADC channels Pedestal RMS [ADC Channel] Station-2 Station-3

  24. South Noise/Signal Ratio @ Run12 200GeV pp Pedestal RMS / MPV [%]

  25. South Additional +DV for N/S=1.3% Additional DV to Achieve N/S => 1.3%

  26. Proposed HV Setting

  27. Backup Slides

  28. Run9 vs. Run11 for Same HV Setting

  29. Run11 Gas Ratio Change Minor only a few % Gain change. Unit:%

  30. North Gain before/after Ar Increase Green:after, 4/9, 1020mbar Red:before, 3/17, 1017mbar

  31. South Gain before/after Ar Increase

  32. Gain Change (Station Averaged) About 20% gain increase was observed.

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