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Géraldine Conti

May 21, 2007. Géraldine Conti. Monday Seminar. IT Frame Survey. &. Detector Boxes Fiducialisation. 1. IT Frames. IT3A. IT2A. IT1A. IT3C. IT2C. IT1C. ~6m. ~3.7m. May 21, 2007. Géraldine Conti. Monday Seminar. IT Frame Survey Coordinate System (1).

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Géraldine Conti

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  1. May 21, 2007 Géraldine Conti Monday Seminar IT Frame Survey & Detector Boxes Fiducialisation 1

  2. IT Frames IT3A IT2A IT1A IT3C IT2C IT1C ~6m ~3.7m May 21, 2007 Géraldine Conti Monday Seminar IT Frame Survey Coordinate System (1) • The origin of the Survey coordinate system is at the Interaction Point (IP) • Correction of the nominal z values : z’ = znominal - tan(0.003601)·x • 6 half-frames to be surveyed ITA/C Survey coordinate system Z (SU) vertical Towards pit 1 (ATLAS) LHC Nominal Beam Line X (SU) horizontal 3.601 mrad IP horizontal LHCb coordinate system Towards pit 7 y Y (SU) horizontal z Towards LHC centre x 2

  3. May 21, 2007 Géraldine Conti Monday Seminar IT Frame preliminary results (2) • First IT « Geometrical Controls » (Local coordinate system) and Adjustments (Survey coordinate system) realized from the magnet area by a triangulation method (theodolite): • IT1C(Oct.18th 06, https://edms.cern.ch/document/790118 Geometrical Control ) • IT2C (Nov. 9th 06, https://edms.cern.ch/document/794872 Geometrical Control ) • IT3A (Jan.26th 07, https://edms.cern.ch/document/816280 Before Adjustment ) (Feb. 1st 07, https://edms.cern.ch/document/817512 After Adjustment ) • IT3C (Dec. 5th 06, https://edms.cern.ch/document/806184 Geometrical Control ) (Feb. 2nd 07, https://edms.cern.ch/document/818463 Before Adjustment ) • Due to Beam Pipe UX85 2 & 3 (and protections) installation, no access to magnet area possible any more : New strategy for IT Survey (2 steps) • Frame survey measurements in Opened position • Frame survey measurements in Closed position 3

  4. May 21, 2007 Géraldine Conti Monday Seminar Survey in opened position : Photogrammetry (3) • Theodolite measurements of fiducial marksgive the global scale in almost closed position. • Take ~150 photographs of the frame in opened position, which contains permanent coded photo targets(20)recognized by the system. • Photogrammetric targetsare used as a reference for the IT detector boxes positions. Complete E frame geometry on precision rails obtained by the transformation of the coordinates in opened position to the coordinates in almost closed position (with a best fit 3D ). 4

  5. F6 474 475 476 F7 477 478 F5 35mm 35mm z 479 480 y 150mm CBR x 35mm 35mm CBL CBR 481 CTL CTR thickness=0.12mm thickness=0.12mm F4 TT_L TT_R 482 483 TB_L TB_R CT CB 484 485 486 486 Coded targets F3 Fiducial marks CTR 487 488 Photogrammetric targets 490 489 TB_L TB_R F1 F2 491 493 492 May 21, 2007 Géraldine Conti Monday Seminar Survey in opened position (4) View from IP : 5

  6. May 21, 2007 Géraldine Conti Monday Seminar IT Frame Survey : Results (5) • IT1A (March 30th 07) • IT2A (April 19th 07) https://edms.cern.ch/document/834051 https://edms.cern.ch/document/839426 • The most important CT_L/R and CB_L/R targets positions are adjusted thanks to crenels on the brackets. 6

  7. May 21, 2007 Géraldine Conti Monday Seminar Survey in closed position (6) • Theodolite method for the targets on the IT detector boxes and some accessible targets on the E frames.  Final measured positions of the IT detector boxes. • Possible to make the measurements from the outside of the magnet in the RICH1 region. 7

  8. May 21, 2007 Géraldine Conti Monday Seminar IT box Fiducialisation • 12 IT detector boxes to be fiducialised. • IT detector box fiducialisation test performed on Oct. 25th-26th 06. • Precision obtained during the test at 1 level is 0.05mm and 0.1mrad on the angles. • Needs for fiducialisation : • Rotating support for the box • Movable neon lights to ease the measurements of the detector crosses • Table stability (improved with long diagonal bars) https://edms.cern.ch/document/790654 8

  9. dx y (vertical) Nominal positions dy  z (along beam) dz x (horizontal)   Measured positions Offset : dPos=(dx,dy,dz) Rotation : dRot=(,,) Additional targets May 21, 2007 Géraldine Conti Monday Seminar IT Boxes Offsets in ConDB 9

  10. Offset : dPos=(dx,dy,dz) Rotation : dRot=(,,) y 130 x 127   131 126 z 134 134 142  135 Nominal positions Measured positions May 21, 2007 Géraldine Conti Monday Seminar IT sensors Offsets in ConDB 10

  11. May 21, 2007 Géraldine Conti Monday Seminar Survey Timescale • Frame Survey in Opened Position : • IT3A and ITC: • IT3A survey is forseen on Thursday 24th of May. • The ITC photogrammetric measurements should be finished up to mid-July. • Frame Survey in Closed Position : • All IT frames : • Depends on when the IT detector boxes will be finished and when the beam pipe protection will be removed. • IT Detector Box Fiducialisation : • All IT boxes : • The Fiducialisation of the first IT detector box is forseen tomorrow in the clean room at CERN! 11

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