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James N. Bellinger University of Wisconsin-Madison 2-February-2011

Status and Plans for Endcap Hardware Alignment. James N. Bellinger University of Wisconsin-Madison 2-February-2011. James N. Bellinger 2-February-2011. DCOPS Sensors with Laser. A crosshair laser (a pair of lasers each shining through a cylindrical lens) illuminates each of the

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James N. Bellinger University of Wisconsin-Madison 2-February-2011

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  1. Status and Plans for Endcap Hardware Alignment James N. Bellinger University of Wisconsin-Madison 2-February-2011 James N. Bellinger 2-February-2011

  2. James N. Bellinger 2-Feb-2010 DCOPS Sensors with Laser A crosshair laser (a pair of lasers each shining through a cylindrical lens) illuminates each of the DCOPS in turn along the line DCOPS Laser

  3. James N. Bellinger 2-Feb-2011 Stability and Precision mm The DCOPS system is capable of good precision. Individual events show variation in fit, especially with relaxed quality cuts, but the averages show appropriate stability. The question of whether the floor was sagging under our disks was answered quickly: Variation with time is less than 100µ Time (seconds in epoch) Position of Transfer Line 1 ME+3 Radial Offset wrt ideal center Loose quality cuts

  4. O.Prokofiev R-j Hand Fit Residuals (offsets) for SLM Lines ME+/-2,3, B = 0 Fit tracks PG closely Fit=blue, PG=red mm Prokofiev 2010 Agreement between hand fit and PG data is about of 0.5 mm PG data is good enough to validate COCOA fit.

  5. CSC & DPG Meeting - S. Guragain Z-Bending consistent ME2/3 and with ANSYS FEA and ME1 ANSYS ests SLM1 SLM2 SLM3 YE1 ests B=3.8T Samir 2009

  6. James N. Bellinger 2-Feb-2011 Validation: SLM • Compare 0T fits to photogrammetry: • RMS of order 1mm in X or Y in SLM • We believe we can do better than that: Oleg’s work shown earlier 930µ ΔxCMS

  7. James N. Bellinger 2-Feb-2011 Transfer Lines Local coords Axial lasers link the DCOPS on transfer plates from disk to disk Fit each of the 6 laser lines in its two local coordinates: “radial” and “tangent” For a station plot residual vs line # and fit for a sine+constant. The amplitude is the disk shift, the phase tells the direction of shift and the constant (for the tangent fit) is the Z-rotation ∙ radius Measure relative disk shift and rotation

  8. James N. Bellinger 2-Feb-2011 Transfer Line Fit Residuals Measure Disk Shifts, Z-rotations YE2 (tangent) YE2 (radial) Residual (mm) Residual (mm) Failed to reconstruct Both ME+3 and ME+2 plotted YE2 is shifted wrt YE3 by 4.5mm in 130º direction. Z-rotation is .4mrad YE1 is shifted wrt YE3 by 4.9mm in 205º direction. Z-rotation is .5mrad YE1 (tangent)

  9. James N. Bellinger 2-Feb-2011 Transfer Lines • Transfer Lines connects • Endcaps • Barrel MABs • YB2: measured by Link and Barrel • YB0: only measured by Barrel • Compare relative positions of MABs • Give Endcap Transfer Points positions in space wrt the Link MABs Gives each Transfer Line 2 fixed points in space

  10. James N. Bellinger 2-Feb-2011 Plans • Hardware • The Minus side Link disk is now in the proper location, and their analysis is in progress! The mislocation was a major handicap in last year’s analysis. • Software • Integration

  11. James N. Bellinger 2-Feb-2011 Hardware Work by Xiaofeng • Repair broken picomotors • Repair accessible broken DCOPS • Align Transfer Line lasers for 0T • get good data (this time!) • Verify all SLM lasers after T1 installation • Dismount/remount ME4/PT5 lasers/DCOPS for disk moving DONE

  12. James N. Bellinger 2-Feb-2011 Hardware Plans • Realign Transfer Line lasers to estimated positions for 3.8T (next week) • When we have a long “technical stop” (not feasible at this time) • Fix broken DCOPS (inaccessible for now) • Align SLM for 3.8T instead of current compromise • Replace transfer line laser

  13. James N. Bellinger 2-Feb-2011 Software Plans: Barrel Twist TB=track-based HW=HardWare • Barrel hardware alignment and barrel tracking don’t agree: 4mm relative “twist” end to end There is also a compression in Z, but Endcap studies have no sensitivity to MAB Z

  14. James N. Bellinger 2-Feb-2011 Resolving the Barrel Twist • What part of the barrel twist is real? • Barrel/Link hardware measurements are consistent with each other • Tracking fits are consistent with each other • Transfer Line measures outer end of MABs • Can fix MABs relative to each other • Can align MABs to Endcaps and look for shifts • Independent check

  15. James N. Bellinger 2-Feb-2011 Software Projects • Consistency check for calibration numbers Wisconsin • Revisit the Transfer Line fit—MAB model has a problem Wisconsin • Validate Cocoa fitter with an alternative fit to SLM (in progress) Wisconsin

  16. James N. Bellinger 2-Feb-2011 Integration Plans • New tracking model by Pivarski under test • Integrates relative chamber positions from SLM fits (4 chambers per SLM) as a weighted constraint in the overall fit. Florida Tech

  17. James N. Bellinger 2-Feb-2011 Automation of Processing • Most of the machinery for Cocoa processing is in place and tested on lxplus • Partition data into parallel sets • Merge link information • Process Cocoa, retrieve information and generate XML fragment • No substitute for a human reviewing the events—DQM doesn’t catch everything • Event transfer isn’t automatic yet. TBD • Inserting Link fit information isn’t automatic yet. TBD

  18. James N. Bellinger 2-Feb-2011 Summary • Hardware: • aside from a few DCOPS the system is working, will be ready for 3.8T next week • Software: • SLM processing machinery—in place • Transfer Line to test barrel twist—in progress • Integration of hardware fit in tracking—under test

  19. James N. Bellinger 2-Feb-2011 BACKUP

  20. James N. Bellinger 2-Feb-2011 Disk Sagging Poor profile No sign of sagging. Small changes with initial turnon. Equal time intervals not equally populated

  21. James N. Bellinger 2-Feb-2011 ANSYS Figure

  22. - S. Guragain Accuracy Checks with DCOPS Evaluate the following discrepancies: For DCOPS targets in all 3 dimensions: Δx = xPG – xreco,Δy = yPG – yreco, Δz = zPG – zreco If all were “perfect”, we’d expect Gaussians: • centered at 0 •  = PG  reco = 300 m  250 m = 400 m ΔxCMS Samir, 2008 930µ ΔzCMS ΔyCMS 430µ 1090µ

  23. James N. Bellinger 2-Feb-2011 Fits for ME+3 and ME+2 Tangent Direction of Transfer Lines

  24. James N. Bellinger 2-Feb-2011 More Software Projects: Search for Twist • Hybrid tracking + hardware reconstruction • Predict where chambers are • Defines DCOPS positions • SLM reconstruction gives Transfer Plate (rphi only) • TP rphi for ME2 and ME3 gives base for projecting Transfer Lines into MAB • Compare Plus and Minus projections into MABs, look for twist

  25. James N. Bellinger 2-Feb-2011 Look for Evidence for Twist in Offsets If twist is real, should see offset in projections into MAB Extrapolate line

  26. James N. Bellinger 2-Feb-2011 Compromises • SLM lasers only adjustable when field off • Time-consuming to realign these • Selected a compromise alignment that could be tested in 0T and still work in 3.8T • Not ideal for either

  27. James N. Bellinger 2-Feb-2011 Z Sensors • Two limited-effort attempts to get the Z-sensor model working failed. • We use a differential approach instead. • Assume Z from assembly survey is correct and calculate Transfer Plate positions • Use change in Z-sensor from 0T to 3.8T to predict the change in Transfer Plate positions • Not urgent enough to redirect already insufficient manpower to solve the problem.

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