VELO Module Metrology

1. VELO Module Metrology John Carroll

2. Alignment in X & Y John Carroll – VELO Midterm review

3. Module Metrology Relative alignments between R and Phi sensors measured on Smartscope (Sms) and CMM show reasonable agreement John Carroll – VELO Midterm review

4. Module Metrology Differences of the above show that Smartscope and CMM agree to +-10 microns, apart from 3 modules (M30,M32,M37) John Carroll – VELO Midterm review

5. Module Metrology Absolute positions of centre of Si from CMM for R LHCb x is within 20 micron tolerance LHCb y still needs to be reduced John Carroll – VELO Midterm review

6. Module Metrology John Carroll – VELO Midterm review

7. Module Metrology John Carroll – VELO Midterm review

8. Module Metrology John Carroll – VELO Midterm review

9. Module Metrology Absolute R and P rotations from CMM. Show a systematic offset from zero of -0.24 mrad. with a standard deviation of 0.06 mrad. Need to bring the systematic down towards zero. John Carroll – VELO Midterm review

10. Module Metrology Silicon Alignment Average STD R to Phi alignment (X,Y) -0.001,-0.003 0.007,0.016 R absolute (X,Y) -0.002,0.016 0.008,0.010 R to Phi rotation (mrad) 0.041 0.044 R absolute (mrad) -0.238 0.059 John Carroll – VELO Midterm review

11. Module Metrology Pedestal Mounts John Carroll – VELO Midterm review

12. Module Metrology Alignment in Z John Carroll & Girish Patel John Carroll – VELO Midterm review

13. Module Metrology John Carroll – VELO Midterm review

14. Module Metrology John Carroll – VELO Midterm review

15. Mod met John Carroll – VELO Midterm review

16. Module Metrology John Carroll – VELO Midterm review

17. Module Metrology Top of Silicon Envelope Average STD Separation envelope 2.29 0.1 Twist mm 0.02 0.25 Tilt mm 0.08 0.06 Forward edge 1.16 0.27 Rearward edge -1.12 0.23 ------------------------------------------------------------------ Envelope Nominal Worst case Forward 1.15 1.767 Backward -1.15 -1.654 John Carroll – VELO Midterm review

18. Module Metrology Proposed Constraint System John Carroll – VELO Midterm review