Muon Endcap Alignment Analog Sensor Calibrations & Software Update

1. Muon Endcap AlignmentAnalog Sensor Calibrations & Software Update Samir Guragain, Marcus Hohlmann Florida Tech October 2005 USCMS EMU meeting – Fermilab, Oct 21/22, 2005

2. ME Alignment System Transfer plate Z-sensors Clinometers Note: only small sample of analog sensors shown R-sensors DCOPS To be featured in Physics TDR – Vol.1 M. Hohlmann - EMU meeting at Fermilab

3. Overview • Update on analog sensors • Final calibration results for two types of Z-sensors • Final calibration results for Clinometers • ME1 proximity (PX) sensors • Software preparation • Overall data flow • To do list • Plans for Magnet test M. Hohlmann - EMU meeting at Fermilab

4. Recent activities • Built specialized calibration mounts for ME1 Z-, R-, proximity-sensors, ME4 R-sensors • Calibrated all clinometers, Z-sensors and shipped to PSL/FNAL for mounting • Initiated alignment software development activities during 1-month summer stay at LPC • Graduated a CMS M.S. student (Marion Ripert, now working with Laszlo Gutay at Purdue) M. Hohlmann - EMU meeting at Fermilab

5. Progress update M. Hohlmann - EMU meeting at Fermilab

6. Full set of Z-potentiometers: Sensor-to-sensor variation Slopes: < ± 1% variation Abs ( ) Note: In the end, we will actually use fit results for response relative to a reference voltage: V(z)sensor/Vref M. Hohlmann - EMU meeting at Fermilab

7. % Full set of Z-potentiometers: Relative errors on slopes Error on slopes [%] M. Hohlmann - EMU meeting at Fermilab

8. ME1 Z-Laser sensors Z-laser sensor (“ME1”) Linear Mover (“barrel”) IR laser beam Z-potentiometer (“link to ME2”) Diffusely reflective surface M. Hohlmann - EMU meeting at Fermilab

9. Typical Z-laser response (ME1) Trial1 ME+1-TP3-ZLB11 Slope = 1.0062 (V/cm) Error in slope = 0.00039 (V/cm) Distance [cm] M. Hohlmann - EMU meeting at Fermilab

10. Full set of Z-lasers: Sensor-to-sensor variation Slopes: ± 1% variation M. Hohlmann - EMU meeting at Fermilab

11. % Full set of Z-lasers: Relative errors on slopes Error on slopes [%] M. Hohlmann - EMU meeting at Fermilab

12. Typ. Clinometer response Angle [deg] M. Hohlmann - EMU meeting at Fermilab

13. Full set of Clinometers: Sensor-to-sensor variation in X in Y Slopes: ± 6% variation Note: Pos. and neg. inclinations are fitted separately; each device has two entries in each histogram. M. Hohlmann - EMU meeting at Fermilab

14. Full set of Clinometers: Relative Errors on Slopes in X in Y Errors on Slopes: 0.3% M. Hohlmann - EMU meeting at Fermilab

15. Total Calibration Uncertainties Final numbers for all sensor types: (specifications) R-sensors± 100 μm (<± 430 μm) Z-sensors± 55 μm (< ± 1000 μm) PX-sensors± 55 μm Clinometers± 0.02o M. Hohlmann - EMU meeting at Fermilab

16. ME1 proximity sensors Ready to perform calibrations 2 prox. sensors Linear mover Establish absolute reference distance Prec. dowel pins Precision reference bar Calibrate 2 sensors simultaneously M. Hohlmann - EMU meeting at Fermilab

17. Road to Completion • Calibrate & deliver in this order: • ME+1 PX sensors • ME+1 R sensor • ME-1 PX sensors • ME-1 R sensors • ME±4 R sensors • Spare clinometers • Document calibration project in CMS note M. Hohlmann - EMU meeting at Fermilab

18. Alignment Software • July 05: While at LPC, initiated contact with Calibration, Alignment, Database (CalAliDB) working group • leadership: Lee Lueking (FNAL) & Oliver Buchmüller (CERN) • Now: Tri-weekly meetings on alignment DB issues • Muon Barrel & Link people also participating • attempt to unify alignment software for tracker and muon as much as possible • Fl. Tech working with Lee Lueking’s group M. Hohlmann - EMU meeting at Fermilab

19. CSC data Optical & analog sensor rawdata Geometry Database COCOA IN COCOA: Alignment fits (in CMSSW framework) COCOA OUT Offline reco Muon Trigger HLT, L1 POOL-ORA object Format: Event data XML files (?) POOL-ORA object (directly or via ascii) XML files Optical & analog sensor calibration data Data Structure & Flow As of October 2005 (auto-conversion of existing ascii geometry from old COCOA version – Pedro Arce) CSC “Alignment object” contains chamber offsets …Δxi Δyi Δzi Δαi Δβi Δγi... (Fl. Tech) (Fl. Tech) (Fl. Tech) Magnet-off Photogrammetry & Survey data MUON TRACKS (by hand – Dave Eartly?) (by hand - Fl. Tech) M. Hohlmann - EMU meeting at Fermilab

20. Integrated some analog sensors into COCOA Note: Sensor sizes greatly exaggerated for visibility SLM: z DCOPS R-sensors Representations of R-sensors front CSC SLM reference Visualization output from COCOA alignment model back CSC Samir Guragain, MH LPC July 2005 M. Hohlmann - EMU meeting at Fermilab

21. To do list • Produce COCOA version in CMSSW (P. Arce) • Develop COCOA-IN & COCOA-OUT (Fl. Tech + tracker?) • Transform calibration data, sensor data, geometry, survey data into database formats for use by COCOA • Have started w/ strawman table for analog sensor calibration • Need to verify nominal COCOA geometry against CAD files and actual nominal on-detector geometry (Fl.Tech & D. Eartly) • Understand COCOA performance for ME with magnet test data • create alignment object as output for offline reco use M. Hohlmann - EMU meeting at Fermilab

22. Magnet test • Main goal (in my opinion): Get good data ! Mostly analyze it later … • Ensure that ME+ alignment system is fully instrumented and can be read out • Planning to send Fl. Tech grad student Samir Guragain to CERN for 5-6 months in January 2006 to help commission read-out; get M&O support from Giorgio to do so • Magnet-off photogrammetry (Dave Eartly) M. Hohlmann - EMU meeting at Fermilab

23. Magnet test cont’d • Test basic functionalities first: • Do the controls work (e.g. lasers for SLMs) ? • Does the readout work? • Do raw sensor readings make sense (magnet off vs. magnet on) ? • Does the raw data get written out properly in event data format ? • Suggested alignment exercise: • Move disks relative to each other and relative to barrel by few mm and detect with Z-sensors with magnet off (is this even possible?) M. Hohlmann - EMU meeting at Fermilab

24. Magnet test cont’d • Output parameters from COCOA fits for reconstruction: • 6 parameters per chamber: • Δx, Δy, Δz displacements of chamber centers • Δα, Δβ, Δγ rotation of chambers • Currently no plans to align at a lower level (strips, wires) with the hardware alignment system. Maybe later we can get more sophisticated once the basics are under control. M. Hohlmann - EMU meeting at Fermilab

25. Summary & Outlook • Calibration of Clinometers and Z- sensors done. Keep on calibrating R- and PX. Finish soon ! • Software side of alignment gaining momentum. Jump into it full-time as soon as hardware done. Lots to do. • Help commission alignment DAQ at CERN starting early 2006. M. Hohlmann - EMU meeting at Fermilab

26. Loosely related news Friday afternoon Florida Tech M. Hohlmann - EMU meeting at Fermilab