1. LHCb VELO Sensor Review Production Design Readiness 6 August 2003 T. Bowcock

2. 2 Overview Design Geometry Checking Submission Quality Control Discussion Contract

3. 3 Design Geometry PR-04 Design Substantive Changes Risks Checking Method and Time Submission

4. 4 Design Geometry - Φ PR-04 Phi Sensor Coordinate system Outside edge defined by point 1-14 Penetration 2565 microns Foil Cutoff (13/14) Point XY 136671.23-2070.0 1412906.02565.0 144455.02565.0 y x

5. 5 Design Geometry - Φ Inner Radius 6985μm y x

6. 6 y x Design Geometry - Φ Angles of cut 22.5°

7. 7 y x Design Geometry - Φ Outer radius (2,3,4,5,6,7,8) 42235μm Note(1 and 9) 44455μm

8. 8 Design Geometry - Φ Cutting All edges straight Ex. inner radius Saw cutting y x

9. 9 y x Design Geometry - Φ Angles of cut 22.5°

10. 10 y x Design Geometry - Φ Outer radius (2,3,4,5,6,7,8) 42235μm Note(1 and 9) 44455μm

11. 11 Design Geometry – R Inner Radius 6985μm y x

12. 12 y x Design Geometry - Φ Tolerances Saw compatible Detector rejected outside tolerance 35μm(85 inner radius) 75μm(135 inner radius)

13. 13 Design Geometry - Φ Active Area r inner 8170μm r outer 42000μm y x

14. 14 y x Design Geometry - Φ Inner/Outer Split r split 17250μm d split 63μm maximum insensitive distance 47μm

15. 15 Design Geometry - Φ Strips Inner 683 Outer 1365 Stereo inner 20° at r inner 9.3° at r split Stereo outer 10.4° at r split 4.2° at r outer y x

16. 16 Design Geometry - Φ y x Angular coverage Inner 180.6° Outer 180.5° Angular Separation Inner Δθ=0.264° Outer Δθ=0.132°

17. 17 y x Design Geometry - Φ Bond Pads in 2 rows 2 32 in straight line Radial (4° to strips)

18. 18 Design Geometry - Φ Bond Pads 300 72μm y x 450μm INNEROUTER Rmin4084241292 Rmax4089041340 Strip 1

19. 19 Design Geometry - Φ Bond Pads Readout Order Undesirable feature mod(6) geometry Pad ID each 10. Groups of 64 identified. 12 3 4 5 6 12 3 45 6 outer inner

20. 20 Design Geometry - Φ Bond pad Section 1 outer inner bonding probing

21. 21 Design Geometry - Φ Fiducials New design optimized for automated bonding Improved processing y x

22. 22 Design Geometry – R Point XY 13 6671.232070.0 14 11157.02025.0 1 45469.02025.0 y x PR-04 R Sensor Coordinate system Outside edge defined by point 1-14 Penetration 2025 microns Foil Cutoff

23. 23 Design Geometry – R Inner Radius 6985μm y x

24. 24 y x Design Geometry – R Angles of cut 22.5° 4 Sectors

25. 25 Design Geometry – R Outer radius (2,3,4,5,6,7,8) 44200μm Note(1 and 9) 45469μm y x

26. 26 Design Geometry – R Cutting All edges straight Except inner radius Saw cutting y x

27. 27 Design Geometry – R Tolerances Saw compatible Detector rejected outside tolerance 35μm(85 inner radius) 75μm(135 inner radius) y x

28. 28 Design Geometry – R Active Area r inner 8170μm r outer 42000μm y x

29. 29 Design Geometry – R Sector Split 45°,90°,135° d split [2-3] 63μm maximum insensitive distance 47μm d split [1-2,3-4] 16μm no inefficiency y x 1 2 3 4

30. 30 y x Design Geometry – R Strips 4 sectors 512 Radii r inner 8190μm r outer 41969.5 μm Formula r = [exp{b * (n – 1)} * 40 – (40 – b * 8190)] / b b = 0.0018232830411147615

31. 31 Design Geometry – R Pitches P inner 40μm P outer 101.55μm Width W~0.4 pitch y x

32. 32 Design Geometry – R Bond Pads 2 32 in straight line Angle Group –180 x (2n – 1) / 64° y x

33. 33 Design Geometry – R Bond Pad Sizes Outer 310 90μm Inner 300 90μm Spacing 430μm

34. 34 Design Geometry – R y x

35. 35 Design Geometry – R y x

36. 36 Design Geometry – R y x

37. 37 Design Geometry – R y x y x