2. Optical position sensor for the BWS Upgrade: Disk Samples measurements at different roughness (Stainless Steel and Aluminium) BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 2 Jose Luis Sirvent Blasco PhD. Student BWS Upgrade Electro-Mechanical design Meeting 19/11/2015

3. 1. New Disk Samples: 304L 1.1 Different Material Roughness (with mechanical threatment) BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 3 Sample 1: 304L Ra 3.2Sample 2: 304L Ra 0.8Sample 3: 304L Ra 0.4Sample 4: 304L Ra 0.1 Test Procedure: Samples placed in front of optical sensor Focused spot of light Diam approx = 20um Optical reflections collected while sample rotates (Constant 43.3 rad/s) The tests collect will information from: 1. Only metal regions 2. Each of the tracks of the disks 3. Three temporal scales: Revolution, Segment & Slits detail.

4. 1. Sample 304L Ra 3,2 Only Metal BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 4 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

5. 1. Sample 304L Ra 3,2 Track #1 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 5 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

6. 1. Sample 304L Ra 3,2 Track #2 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 6 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

7. 1. Sample 304L Ra 3,2 Track #3 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 7 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

8. 1. Sample 304L Ra 3,2 Track #4 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 8 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

9. 2. Sample 304L Ra 0.8 Only Metal BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 9 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

10. 2. Sample 304L Ra 0.8 Track # 1 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 10 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

11. 2. Sample 304L Ra 0.8 Track # 2 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 11 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

12. 3. Sample 304L Ra 0.4 Only Metal BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 12 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

13. 3. Sample 304L Ra 0.4 Track # 1 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 13 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

14. 3. Sample 304L Ra 0.4 Track # 2 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 14 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

15. 3. Sample 304L Ra 0.4 Track # 3 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 15 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

16. 3. Sample 304L Ra 0.4 Track # 4 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 16 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

17. 3. Sample 304L Ra 0.1 Only Metal BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 17 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

18. 3. Sample 304L Ra 0.1 Track # 1 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 18 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

19. 3. Sample 304L Ra 0.1 Track # 2 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 19 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

20. 3. Sample 304L Ra 0.1 Track # 3 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 20 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

21. 3. Sample 304L Ra 0.1 Track # 4 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 21 1 Revolution Arc = 2,1 mm Arc = 0.5 mm

22. 4. Conclussions on 304L: A reduced roughness show better optical characteristics. Roughness 0.1 still not enough for optical applications, light disperssion stills present for 1310nm. A new approach for surface threatment must be considered. Diamond polishing? Apply a chrome layer on samples and then laser threatment for slits?? Laser threatment used in many of the tracks is suitable. 50% Duty cycle it´s ok in all tracks. Roughness stills a problem. BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 22

23. BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 23 5. New Disk Samples: Aluminium 5.1 Different Material Roughness (with mechanical threatment) Sample 1: Al. Ra 3.2Sample 2: Al. Ra 0.8Sample 3: Al. Ra 0.4Sample 4: Al. Ra 0.1 Test Procedure: Samples placed in front of optical sensor Focused spot of light Diam approx = 20um Optical reflections collected while sample rotates (Constant 52.7 rad/s) The tests collect will information from: 1. Only metal regions 2. Each of the tracks of the disks 3. Three temporal scales: Revolution, Segment & Slits detail.

24. 6. Sample Al Ra = 3.2 Track #1 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 24 1 Revolution Arc = 1 mm Arc = 0.26 mm

25. 6. Sample Al Ra = 3.2 Track # 2 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 25 1 Revolution Arc = 1 mm Arc = 0.26 mm

26. 6. Sample Al Ra = 3.2 Track # 3 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 26 1 Revolution Arc = 1 mm Arc = 0.26 mm

27. 6. Sample Al Ra = 3.2 Only Metal BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 27 1 Revolution Arc = 1 mm Arc = 0.26 mm

28. 7. Sample Al Ra = 0.8 Track # 1 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 28 1 Revolution Arc = 1 mm Arc = 0.26 mm

29. 7. Sample Al Ra = 0.8 Track # 2 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 29 1 Revolution Arc = 1 mm Arc = 0.26 mm

30. 7. Sample Al Ra = 0.8 Track # 3 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 30 1 Revolution Arc = 1 mm Arc = 0.26 mm

31. 7. Sample Al Ra = 0.8 Only Metal BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 31 1 Revolution Arc = 1 mm Arc = 0.26 mm

32. 8. Sample Al Ra = 0.4 Track #1 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 32 1 Revolution Arc = 1 mm Arc = 0.26 mm

33. 8. Sample Al Ra = 0.4 Track #2 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 33 1 Revolution Arc = 1 mm Arc = 0.26 mm

34. 8. Sample Al Ra = 0.4 Track #3 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 34 1 Revolution Arc = 1 mm Arc = 0.26 mm

35. 8. Sample Al Ra = 0.4 Only Metal BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 35 1 Revolution Arc = 1 mm Arc = 0.26 mm

36. 9. Sample Al Ra = 0.1 Track # 1 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 36 1 Revolution Arc = 1 mm Arc = 0.26 mm

37. 9. Sample Al Ra = 0.1 Track # 2 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 37 1 Revolution Arc = 1 mm Arc = 0.26 mm

38. 9. Sample Al Ra = 0.1 Track # 3 BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 38 1 Revolution Arc = 1 mm Arc = 0.26 mm

39. 9. Sample Al Ra = 0.1 Only Metal BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 39 1 Revolution Arc = 1 mm Arc = 0.26 mm

40. 10. Observation: Only Metal For same roughness AL looks smoother (Ra 0.1) ? BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 40 1 Revolution Arc = 2,1 mm Arc = 0.5 mm 1 Revolution Arc = 1 mm Arc = 0.26 mm AL Ra 0.1304L Ra 0.1

41. 10. Observation: Only Metal For same roughness AL looks smoother (Ra 0.4) ? BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 41 1 Revolution Arc = 2,1 mm Arc = 0.5 mm 1 Revolution Arc = 1 mm Arc = 0.26 mm AL Ra 0.4304L Ra 0.4

42. 4. Conclussions on AL: A reduced roughness show better optical characteristics. Roughness 0.1 still not enough for optical applications, light disperssion stills present for 1310nm. A new approach for surface threatment must be considered. Diamond polishing? Apply a chrome layer on samples and then laser threatment for slits?? In general for all samples AL And 304 Laser threatment is OK, no residual material in slits. Aluminium is showin softer transitions for same Ra?? Material characteristics?? The laser threatment in tracks 2 & 3 of the different AL samples seems not to reach a 50% duty cycle. There is maybe too few metal between slits. BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 42 Same than 304L

43. BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch) 43