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Calibration of Analog Alignment Sensors Status – February 2005

Calibration of Analog Alignment Sensors Status – February 2005. M. Hohlmann , G. Karagiorgi, M. Ripert Florida Tech. USCMS EMU meeting – UC Davis, Feb 25/26, 2005. Progress overview. Note: All R- and Z-sensors for ME+2 are now calibrated. Calibration procedure.

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Calibration of Analog Alignment Sensors Status – February 2005

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  1. Calibration of Analog Alignment SensorsStatus – February 2005 M. Hohlmann, G. Karagiorgi, M. Ripert Florida Tech USCMS EMU meeting – UC Davis, Feb 25/26, 2005

  2. Progress overview Note: All R- and Z-sensors for ME+2 are now calibrated M. Hohlmann - EMU meeting at UC Davis

  3. Calibration procedure • Moved calib. bench to new lab; recommissioned • Subject each sensor to 5 calibration runs • Remove sensor mounts between runs to reestablish absolute initial distance with reference bars • Distance ranges covered by calibrations R1: 45.8 - 52.8 cm R2: 22.9 - 32.0 cm; R2-Towers: 22.9 - 31.5 cm Z: 2.9 - 4.3 cm • Measure V(x), Vref for 80-110 data points per run • Perform linear fits for V(x) and V(x)/Vref • Calculate average slopes & intercepts w/ errors M. Hohlmann - EMU meeting at UC Davis

  4. R-sensors R-sensor: wire extension pot. 2 types of prod. towers R-sensor Z-sensors dowel pins for DCOP sensors 4 types of prod. plates Linear mover Stand M. Hohlmann - EMU meeting at UC Davis

  5. R: Absolute Sensor Response vs. Distance V(x) χ2 = 0.00985828 Fit line: V(x) = ax + b V(x) = 2.0548x – 96.068 σ(a) = 0.000657 σ(b) = 0.0325 M. Hohlmann - EMU meeting at UC Davis

  6. Calibration record M. Hohlmann - EMU meeting at UC Davis

  7. σ mean = 0.86 % R: Sensor-to-sensor variation of slopes Gauss fit: mean = 2.0435 V/cm σ = 0.0175 V/cm M. Hohlmann - EMU meeting at UC Davis

  8. σ mean = 0.22 % R: Sensor-to-sensor variation of slopes – zoomed in Gauss fit – R1: mean = 2.0601 V/cm σ = 0.0044 V/cm M. Hohlmann - EMU meeting at UC Davis

  9. R: Rel. errors on slopes Gauss fit: mean = 0.021 % σ = 0.015 % M. Hohlmann - EMU meeting at UC Davis

  10. R: Sensor-to-sensor variation of y-intercepts Gauss fit – R1: mean = 96.2098 V σ = 0.3955 V Gauss fit – R2: mean = 52.9980 V σ = 0.5924 V σ mean = 0.41 % σ mean = 1.12 % Abs ( ) M. Hohlmann - EMU meeting at UC Davis

  11. R: Rel. errors on y-int. Gauss fit: mean = 0.030 % σ = 0.017 % M. Hohlmann - EMU meeting at UC Davis

  12. R: Vref variation Gauss fit: mean = 11.1591 V σ = 0.0012 V σ mean = 0.012 % M. Hohlmann - EMU meeting at UC Davis

  13. R: Slopes of V(x)/Vref fits Gauss fit – R1: mean = 0.1845 cm-1 σ = 0.0003 cm-1 σ mean = 0.16 % M. Hohlmann - EMU meeting at UC Davis

  14. Z-sensor response V(x): Slight non-linearity confirmed χ2 = 0.328559 Fit line: y = ax + b y = -10.302x – 43.955 σ(a) = 0.0241 σ(b) = 0.09 M. Hohlmann - EMU meeting at UC Davis

  15. σ mean = 0.63 % Z: Sensor-to-sensor variation of slopes Gauss fit: mean = 10.3520 V/cm σ = 0.0649 V/cm Abs ( ) M. Hohlmann - EMU meeting at UC Davis

  16. Z: Rel. errors on slopes Gauss fit: mean = 0.032 % σ = 0.016 % M. Hohlmann - EMU meeting at UC Davis

  17. Z: Rel. errors on y-int. Gauss fit: mean = 0.019 % σ = 0.007 % M. Hohlmann - EMU meeting at UC Davis

  18. Z: Slopes for V/Vref fits Gauss fit: mean = 0.9273 cm-1 σ = 0.0058 cm-1 σ mean = 0.62 % M. Hohlmann - EMU meeting at UC Davis

  19. Clinometer calibration Mirror Mechanics finalized M. Hohlmann - EMU meeting at UC Davis

  20. Clinometer calibration Production clinometer Readout for Level Position is ~ +2.25V (nominal is +2.50 V) Response is ΔV ~ 1V per 4 degrees M. Hohlmann - EMU meeting at UC Davis

  21. Clin.: Cross-calibration Angle from direct Laser measurement Angle from geometric calculation – method 1 Angle from geometric calculation – method 2 Needs better understanding – under study… [ ] Translation M. Hohlmann - EMU meeting at UC Davis

  22. Comment on Alignment Software • Contacted Muon Barrel alignment colleagues (Pedro Arce & Teresa Rodrigo) & Mike Case • Not much apparent progress on alignment databases (calibration data; COCOA alignment output data for ORCA muon reco) • CMS databases appear to be ill-defined for alignment purposes at the moment • Will stay in the loop with barrel colleagues… M. Hohlmann - EMU meeting at UC Davis

  23. Summary & Outlook • Calibration of R-sensors and Z- sensors well under control. Keep on calibrating… • R- and Z-sensors for ME+2 ready for shippingand installation on disk • Clinometer calibration needs some morestudies before routine calibrations can start • Dig deeper into software side of alignment… M. Hohlmann - EMU meeting at UC Davis

  24. Loosely related news We’re moved in !!! M. Hohlmann - EMU meeting at UC Davis

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