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Beampipe Alignment, Fixation, Deformation Mini-Review

This mini-review aims to inform everyone about the critical manipulation of the central beampipe. It covers the different fixations, deformation issues, and the importance of proper alignment. Additionally, it discusses the use of strain gauges for monitoring beampipe sag.

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Beampipe Alignment, Fixation, Deformation Mini-Review

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  1. Beampipe Alignment, Fixation, Deformation Mini-Review 9.2. 2007 Goal of the review: Make ‘everyone’ aware of the critical manipulations of the central beampipe.

  2. Beampipe Fixations Fixation SSW Fixation FMD2 Fixation FMD3 3400mm 1200mm

  3. Beampipe Fixations • The beampipe is held in three points. Two of them (on both sides of the ITS) • are rotation points. The third one (on the FWD table) was originally assumed to be a fixed point. However we strongly favor a rotation point: • Beampipe is tested to maximum stress of 15MPa. This translates into a maximum allowed sag of 2.9(1.8)mm for a rotation(fixed) point, which we must not exceed in all circumstances. • The cables holding the beampipe are tensioned to 50N. • The force on the middle support is proportional to the beampipe sag and assumes 36(42)N at the maximum allowed stress of 15MPa. • Measuring this force tells us directly the sag of the beampipe without need for any optical alignment devices. F 3400mm 1200mm

  4. Situation before installation of Beampipe & Bakeout Shell

  5. Installation of Beampipe & Bakeout Shell

  6. Installation of Beampipe & Bakeout Shell Beampipe is supported in the bakeoutshell in two points  O.K. 4600mm

  7. 1st beampipe fixation Removal of first section of bakeout shell. Alignment of beampipe on C-side. Still supported on two points  O.K. Alignment 4600mm

  8. 1st beampipe fixation Fixation of beampipe on FMD3 cone. Monitoring of beampipe fixation  4600mm

  9. 1st beampipe fixation Monitoring of FMD3 beampipe fixation: BCAM looking at a reflective Prism fixed to the ITS structure  Friedrich Lackner 4600mm

  10. 2nd beampipe fixation Strain Gauges  Friedrich Lackner 3400mm 1200mm

  11. Fixation 1 Fixation 2 Fixation 3 (on chariot) Line of sight for survey

  12. Fixation 2 Fixation 3 (on chariot) 3400mm 1200mm

  13. Movement of TPC to IP, 4.6m During the movement of the TPC to the IP, the ITS and the bakeout shell i.e. ALL beampipe support points, are sitting on the ITS rails. In theory, during the displacement of the TPC to the IP, the ITS rails, the ITS and the beampipe don’t move at all. They stay ‘fixed in space’. Because of imprecisions of the TPC movement, the three beampipe fixations points will move. Survey Survey+Strain Gauges Camera 3400mm 1200mm

  14. Movement of TPC to IP Before movement of TPC, ITS is lifted by 3mm. This deforms the beampipe. 1200mm 3400mm 3mm sag=1mm

  15. Movement of TPC to IP Final Test in Torino

  16. Movement of TPC to IP When the TPC has arrived at the IP, the ITS is engaging with the fixation point on the TPC and the ITS is again lowered by 2mm. 1200mm 3400mm 1mm sag=0.3mm

  17. Fixation of beampipe on A-side Beampipe chariot on A-side must be removed and the beampipe must be fixed to the TPC.

  18. Fixation of beampipe on A-side First, the RF valve is fixed to the table.

  19. Fixation of beampipe on A-side Valve Fixation Final Test in Torino.

  20. Fixation of beampipe on A-side Valve Fixation Final Test in Torino.

  21. Fixation of beampipe on A-side Removal of Beampipe Chariot.

  22. Fixation of beampipe on A-side Removal of Beampipe Chariot.

  23. Fixation of beampipe on A-side Temporary fixation of the beampipe. 3400mm 1200mm

  24. Fixation of beampipe on A-side

  25. Fixation of beampipe on A-side

  26. Fixation of beampipe on A-side We want this fixation to be a rotation point. We designed a ‘very theoretical’ rotation point. It cannot withstand the 50kg vaccum force parallel to the beampipe. Longitudinal displacements of several mm.  Changed to a simple clamp. A ‘bit’ of clearance will in reality always realize a rotation point.

  27. Integration Test ended with TPC in final position

  28. Using strain gauges in the 4 cables we can directly monitor the beampipe sag. Since we have 4 cables we even know the exact direction of the sag and we have a redundant system (sum of the forces must always be zero). The VAC group agrees to this idea and the system will be developed by Friedrich Lackner (Ph.D. student TS/SU) early 2006. Such a system is crucial especially in view of the fact that we want to install TOF and TRD in presence of the beampipe.

  29. 1200mm 3400mm

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