1. Status VELO alignment 1.NIKHEF 3D measurements 2.Photogrammetry 3.Calliper checks in x-direction 4.Photogrammetry again Jo van den Brand May 23, 2006

2. CenterFrame Reference points Above spindels Above IP

3. Detector Alignment Frame Reference points

4. VELO reference system IP -335785 555 -555 rotu rotm rotd robdrobu rituritd riburibd rimmrimd 100.5 305610 445 Same for the left side All in mm

5. NIKHEF 3D measurements of Center Frame Dimension x: –633.038 (design: 633.0) –633.028 Dimension y: –554.988 (design: 555.0) –554.977 –554.994 –554.989 Dimension z: –1119.834 (design: 1120.0) –1119.975 Conclusion: x and y within specs z: one point deviates

6. Photogrammetry

7. Note systematic x-offset for left and right halves More than 750  m deviation from NIKHEF 3D?! Fit to center frame design values Rms deviation: 257  m Data for y and z agree within accuracy of method (100  m)

8. Photogrammetry Note systematic x-offset for left and right halves Up to 750  m deviation from NIKHEF 3D?! Up to 1100  m deviation from design values?! Fit to all design values Rms deviation: 348  m

9. Planes and normal vectors Inner planes –ň right = (-1.,-0.00045,-0.00043) –ň left = (1.,-0.00064,-0.00031) Outer planes –ň right = (1.,-0.00018,-0.00024) –ň left = (-1.,-0.00015,-0.00090) Angles between planes –Outer: 1.18 mrad –Inner:1.32 –Inner-outer left:1.44 –Inner-outer right:0.92

10. Planes and normal vectors

11. Center Frame Distortions x 1000 design photogrammetry

12. Inner Frame Distortions x 1000 photogrammetry design

13. Run 1 – Left to right distance Rms deviation Run 1: 444  m tutdbdbutm

14. Calliper measurements on Center Frame Centerframe top –Upstream 1225.9 (design: 1226.0) 1225.8 –Downsteam 1225.6 1225.7 –Middle 1225.9 Centerframe bottom –Upstream 1225.8 –Downstream 1225.8 Measured to machined surfaces on center frame Note: all distances shorter than design value (temperature effect –  T of 5 o gives 100  m Differences between up/downstream up to 200  m

15. Calliper measurements on Center Frame Centerframe top –Upstream 1225.84 (design: 1226.0) –Downsteam 1225.8 –Middle 1225.84 Centerframe bottom –Downstream 1225.8 With mounted spheres: Note: all distances shorter than design values Differences between up/downstream up to 100  m Outer spheres most probably mounted correctly for photogrammetry

16. Summary – so far Center Frame –NIKHEF 3D agrees well with design (~100  m) –NIKHEF 3D agrees with CERN calliper data –NIKHEF 3D for y and z agrees with photogrammetry –Photogrammetry x data disagree with all other measurements May 10, 2006 –Discussions with CERN alignment group –Discuss additional data

17. Orientation wrt Center Frame (Photogrammetry - I results) IP lotu lotm lotd lobdlobu litulitd libulibd limmlimd 326 29812494 270327 256 210 258 512 336 All in mm Positive is too far out Wrt AllOuter

18. Orientation wrt Center Frame (Photogrammetry - I results) IP rotu rotm rotd robdrobu rituritd riburibd rimmrimd 66 200156124 210423 66 390 263 579 385 All in mm Positive is too far out Wrt AllOuter

19. Orientation wrt Center Frame (Photogrammetry - I results) IP lotu lotm lotd lobdlobu litulitd libulibd limmlimd 51 75-64-11 30-30 -43 -45 50 348 147 All in mm Positive is too far out Wrt LeftOuter

20. Orientation wrt Center Frame (Photogrammetry - I results) IP rotu rotm rotd robdrobu rituritd riburibd rimmrimd 340 423344229 449780 365 645 471 743 574 All in mm Positive is too far out Wrt LeftOuter

21. Photogrammetry – Run 1 R L OIOI

22. Photogrammetry – Run 2 R L OIOI

23. Reproducibility – Run 1 and 2 – x R L OIOI

24. Reproducibility – Run 1 and 2 – y R L OIOI

25. Reproducibility – Run 1 and 2 – z R L OIOI

26. Reposition detector supports

27. Rotations wrt Center Frame IP lotu lotm lotd lobdlobu litulitd libulibd limmlimd 51 75-64-11 30-30 -43 -45 50 348 147 Wrt LeftOuter 200 (4) 0 (0) +1.58 mm in second photogrammetry All in mm All blue points moved in Microns (rotations)

28. Orientation wrt Center Frame (Photogrammetry - I results) IP rotu rotm rotd robdrobu rituritd riburibd rimmrimd 340 423344229 449780 365 645 471 743 574 All in mm All points moved in Wrt LeftOuter 600 (12)400 (8) 500 (10) Hardstops Top 0.85  0.35 Upstream 0.65  0.25 Downstream 0.85  <0.05

29. Photogrammetry – Run 3

30. Compare – Run 1 and 3 – x R L OIOI

31. Compare – Run 1 and 3 – y R L OIOI

32. Compare – Run 1 and 3 – z R L OIOI

33. Run 3 – Crosscheck R L OIOI lotm + 1.58 mm

34. Run 1 and 3 – Left to right distance Rms deviation Run 1: 612  m Run 2: 110  m L – 0 R – 400 L – 200 R – 600 L – 0 R – 500 tutdbdbu  z  y

35. Run 1, 2 and 3 – Left to right distance Rms deviation Run 1: 444  m Run 2: 316  m Run 3: 388  m tutdbdbutm Run 2 and 3: 80  m difference 24 x (1.226 m) x (1.4 o C) = 41  m

36. Summary – so far Photogrammetry: Center Frame –for y and z agrees with NIKHEF 3D –Disagreement for x data Average deviation ~380  m Checked with calliper: agrees with NIKHEF 3D Reposition detector supports –Possible within 100  m accuracy This week –Alignment in LHCb pit Employ NIKHEF 3D data Provide independent check on x data