1 / 24

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.

verna
Télécharger la présentation

Calibration of Analog Alignment Sensors Status – February 2005

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related