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Status report on MicroMegas mechanics

Status report on MicroMegas mechanics. CERN PH/DT. Content. Concept remind Vacuum table manufacturing and measurements MM panels design Future plans. Concept (1/2). A sandwich of two soft skin is glued without mechanical constraints. A sandwich is: One glass fibre skin (0.5mm)

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Status report on MicroMegas mechanics

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  1. Status report on MicroMegas mechanics CERN PH/DT Jordan Degrange / Francisco Perez Gomez CERN PH/DT

  2. Content • Concept remind • Vacuum table manufacturing and measurements • MM panels design • Future plans Jordan Degrange / Francisco Perez Gomez CERN PH/DT

  3. Concept (1/2) • A sandwich of two soft skin is glued without mechanical constraints. • A sandwich is: • One glass fibre skin (0.5mm) • Aluminium honeycomb surrounded with an aluminium frame • Second glass fibre skin (0.5mm) • Sandwich schematic view Jordan Degrange/Francisco Perez Gomez PH/DT

  4. Concept (2/2) • Manufacturing concept • The skins are sucked with two vacuum tables • The vacuum table surfaces are perfectly flat • The vacuum table surfaces are set in parallel position Jordan Degrange / Francisco Perez Gomez PH/DT

  5. Vacuum table components • Dimensions: 1300X600 • Manufactured at CERN • Outer surface: Epoxy gel coat ‘’EP Gel coat Weiβ’’ (1+1 reinforced layer). • Structural layer: Glass fibre “Glasgewebe 92150 FK-144 345g/m2 Leinwand’’ + AXSON Epolam 5015 (5 layers). • 4 perforated sides aluminium honeycomb. • Araldite 2011

  6. Vacuum table exploded view Gel coat + Glass fibre (3.5mm) Perforated Al Honeycomb (60mm) Glass fibre (3mm) Al profile (60X30mm) Al inserts (Ø40mm) Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  7. MM Vacuum table (1300mmX600mmX60mm) Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  8. Vacuum Table Cross section Perforated Al honeycomb Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  9. Vacuum table inserts Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  10. Vacuum table QC • Temperature: 20°C • Planarity : 0.077mm • Temperature : 21°C • Planarity : 0.08mm • Temperature : 22.5°C • Planarity : 0.03mm • There’s a temperature influence on flatness to be investigated. CERN Metrology lab CERN PH/DT Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  11. MM panel Design • Reference holes on boards for alignment • Ultem plugs to avoid drilling panels after assembly • All plugs are precisely pre-glued on the board using a dedicated tool • Aluminium frame pre-assembled on tool • Aluminium honeycomb • Araldite 2011 is the best candidate for gluing • Panel manufacturing in one shot Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  12. Assembly tool 4 referenceholes. Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  13. Board on Assembly tool Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  14. Board alignment 4 referenceholes. Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  15. Board alignment 2pins Ø5g6 X Ø5,5g6 Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  16. Board Alignment Ref. Ref. Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  17. Reference plugs gluing Ø5.50 Ø5.0 Ø5.50 Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  18. PCB Alignment Alignment pin Reference plug glued Cyanoacrylate 3M EC100 Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  19. All plugs glued BoardAlignement Ref. Spacer Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  20. Board installation on Vacuum table Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  21. Board indexation Ref. … vacuum pump ON Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  22. Aluminium frame assembly Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  23. Aluminium frame assembly 2 referenceholes per profile Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  24. Aluminium frame installation Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  25. Honeycomb installation Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  26. 2nd board installation on 2nd VT Ref. Ref. Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  27. Vacuum Tables alignment Vacuum Table Ref. Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  28. Vacuum tables alignment Precision shims (11,4mm) Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  29. Polymerisation Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  30. Mesh support frame • Assembled and glued on drift panel using alignment holes • Mesh glued on well defined surface. • Acts as gas manifold. • Large gluing area. • Ground connection Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  31. Mesh support frame Ground connection holes Gas IN/OUT Joint groove Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  32. Mesh support frame Cleaning channel Gas distribution holes (Ø0.5mmØ1.5mm) Gas distribution channel Surface glued on drift panel Gas IN/OUT (Ø2,5mm) Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  33. Board connection Fixation pins and ground connection Board Alignment pin Deflection = 0.01mm Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  34. View of Zebra connector encapsulated Jordan Degrange - Francisco Perez Gomez CERN PH/DT

  35. Future plans and tasks 15.01.14 • Prepare all needed elements for 1 panel assembly (frame, plugs, pins, etc..) • Manufacturing of 1 full set of mesh support. • Investigation of temperature and humidity influence on VT flatness • Drill reference holes on vacuum tables. • Assembly and QC of 1 panel for tooling and procedure validation • Test on gas distribution • Test on mesh gluing • Ground connections tests • Test on zebra fixation • Electrical tests on Zebra connectors Francisco Perez Gomez / Hans Danielsson CERN PH/DT/EM2

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