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

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 2 ME Alignment System R-sensors Z-sensors Note: only small sample of analog sensors shown Clinometers Transfer plate DCOPS To be featured in Physics TDR – Vol.1

10/22/2005 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

10/22/2005 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)

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 5 Progress update Note: Each sensor is sub- jected to 5 calibration runs Total in System Calibrations completed To do R-sensors (ME1,4) Z-sens., potentiometers Z-sensors, lasers Clinometers48 (6 spare) ME1 Proximity sensors 720

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 6 Full set of Z-potentiometers: Sensor-to-sensor variation Abs ( ) Slopes: < ± 1% variation Note: In the end, we will actually use fit results for response relative to a reference voltage: V(z) sensor /V ref

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 7 Full set of Z-potentiometers: Relative errors on slopes % Error on slopes [%]

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 8 ME1 Z-Laser sensors Linear Mover (“barrel”) Z-laser sensor (“ME1”) IR laser beam Z-potentiometer (“link to ME2”) Diffusely reflective surface

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 9 Typical Z-laser response (ME1) Trial1 ME+1-TP3-ZLB11 Slope = (V/cm) Error in slope = (V/cm) Distance [cm]

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 10 Full set of Z-lasers: Sensor-to-sensor variation Slopes: ± 1% variation

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 11 Full set of Z-lasers: Relative errors on slopes % Error on slopes [%]

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 12 Typ. Clinometer response Angle [deg]

10/22/2005 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.

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 14 Full set of Clinometers: Relative Errors on Slopes Errors on Slopes: 0.3% in X in Y

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 15 Total Calibration Uncertainties (specifications) R-sensors ± 100 μm (< ± 430 μm ) Z-sensors ± 55 μm (< ± 1000 μm ) PX-sensors ± 55 μm Clinometers ± 0.02 o Final numbers for all sensor types:

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 16 ME1 proximity sensors Linear mover 2 prox. sensors Precision reference bar Prec. dowel pins Calibrate 2 sensors simultaneously Establish absolute reference distance Ready to perform calibrations

10/22/2005 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

10/22/2005 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

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 19 Data Structure & Flow Offline reco CSC data MUON TRACKS Optical & analog sensor raw data Optical & analog sensor calibration data COCOA: Alignment fits (in CMSSW framework) COCOA OUT COCOA IN CSC “Alignment object” contains chamber offsets …Δx i Δy i Δz i Δα i Δ β i Δ γ i... Geometry Database Magnet-off Photogrammetry & Survey data Muon Trigger HLT, L1 POOL-ORA object (directly or via ascii) POOL-ORA object Format: Event dataXML files XML files (?) As of October 2005 (auto-conversion of existing ascii geometry from old COCOA version – Pedro Arce) (by hand – Dave Eartly?) (by hand - Fl. Tech) (Fl. Tech)

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 20 Integrated some analog sensors into COCOA Samir Guragain, MH LPC July 2005 back CSC front CSC DCOPS Representations of R-sensors SLM reference z Note: Sensor sizes greatly exaggerated for visibility Visualization output from COCOA alignment model R-sensors SLM:

10/22/2005 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

10/22/2005 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)

10/22/2005 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?)

10/22/2005 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.

10/22/2005 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.

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 26 Loosely related news Florida Tech Friday afternoon