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Alignment Update at BNL Workshop - Sector vs. Individual Ladder in SURVEY Geometry

This document presents findings from the July 9-10, 2013 BNL Workshop on alignment work updates. The discussion revolves around whether alignment issues are sector-specific or individual ladder-related. Rotations appear common, but shifts are not consistent. Stability over different runs is explored with rotations being stable but shifts showing significant deviations. SURVEY geometry is favored in various aspects, though deviations from in-situ geometry persist. The alignment procedure shows promising results, yielding significant improvements even after a single iteration. The update includes corrections for various sectors and ladders based on data analysis, aiming for precise alignment estimates. The to-do list outlines future simulation and testing plans for better alignment practices.

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Alignment Update at BNL Workshop - Sector vs. Individual Ladder in SURVEY Geometry

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  1. Alignment work update S. Margetis BNL Workshop July 9-10, 2013

  2. Q: Is it a Sector thing or individual Ladder ? A: Rotations seem common but shifts are not Survey geometry with calibrations was used in production

  3. Q: Is there stability over two different runs? A: Rotations seem to be stable, shifts <100um but significant…need to understand cause Survey geometry with calibrations was used in production

  4. Q: Is SURVEY geometry better than ideal? A: In several aspects YES. Also quality is better. Still significant deviations from in-situ geometry exist

  5. Calibrated/Survey Un-Calibrated/Ideal

  6. Effect of masking/calibrations more obvious

  7. SURVEY appears to have this right

  8. Q: Is Alignment procedure working? A: YES. Even after a single iteration a big improvement is seen Ideal geometry with no calibrations was used in production

  9. Day 152 – First Pass Alignment Update • With the ~600K events I got from Long, I ran the alignment code and got precise estimates (see slide-2) • Produced the “corrected” geometry and re-run the full BFC with updated geometry • about 50K event so far

  10. FIRST PASS ESTIMATED Corrections (angles [only] need a minus sign) SECTOR 4 ____________________________________________________________________________________________________ |dXmkm|dYmkm|dZmkm|alphamrad|betamrad|gamma mrad |Comment ______________________________________________________________________________________________ | -100 | 300 | 2900 | 0 | 0. | -0 | Averagefor PXL sector 4 Ladder 1 ______________________________________________________________________________________________ | -20 | 150 |2970 | 0 | 0. | 0 | Averagefor PXL sector 4 Ladder 2 ______________________________________________________________________________________________ | -100 | 350 |2700 | 0 | 0. | -0 | Averagefor PXL sector 4 Ladder 3 ____________________________________________________________________________________________________ | -200 | +400 | 3000 | 0 | 0 | 0 | Averagefor PXL Ladder 4 ____________________________________________________________________________________________________ SECTOR 7 ______________________________________________________________________________________________ 1500 | 2100 | 3000 | -10 | 10 | 80 | Ladder 1 _____________________________________________________________________________________________ |2350 |1150 |2900 | -15 | 10 | 80 | Averagefor PXL sector 7 Ladder 2 ____________________________________________________________________________________________________ |2330 |1800 |2440 | -15 | 20 | 80 | Averagefor PXL Ladder 3 ____________________________________________________________________________________________________ | 2230 | 2710 | 2570 | -10. | 20 | 80 | Averagefor PXL Ladder 4 !!!

  11. Sector 7 ladder 1 (inner) AFTER BEFORE Most offset and slope gone! AFTER - du residual AFTER - z residual |dXmkm     |dYmkm     |dZmkm     |alphamrad     |beta mrad      |gamma mrad| |1500 | 2100 | 3000 | -10 | 10 | 80

  12. Sector 7 ladder 2 (outer) |dXmkm         |dYmkm         |dZmkm         |alphamrad     |beta mrad      |gamma mrad| |2350           |1150           |2900           |  -15          |  10           |  80           |

  13. Sector 7 ladder 1 (inner) GLOBAL after BFC rerun (50K) AFTER BEFORE

  14. Sector 7 ladder 1 (inner) GLOBAL after BFC rerun AFTER BEFORE

  15. Sector 7 ladder 1 (inner) GLOBAL after BFC rerun AFTER BEFORE

  16. Q: Any strange things that call for deeper tests ? A: Several Survey geometry with calibrations was used in production

  17. Inner ladder inversion?

  18. OK

  19. ??????

  20. Summary – To Do list • Simulation: • Individual ladder rots/transls • rots in progress • Thorough tests is a must • Code/methods synchronization • Multi-pass chain implementation/establishment • Align, monitor time-dependences, understand Clean/Calibrated Data a MUST for proper Alignment

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