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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

Status report on MicroMegas mechanics

CERN PH/DT

Jordan Degrange / Francisco Perez Gomez CERN PH/DT

content
Content
  • Concept remind
  • Vacuum table manufacturing and measurements
  • MM panels design
  • Future plans

Jordan Degrange / Francisco Perez Gomez CERN PH/DT

concept 1 2
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

concept 2 2
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

vacuum table components
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
vacuum table exploded view
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

mm vacuum table 1300mmx600mmx60mm
MM Vacuum table (1300mmX600mmX60mm)

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

vacuum table cross section
Vacuum Table Cross section

Perforated Al honeycomb

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

vacuum table inserts
Vacuum table inserts

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

vacuum table qc
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

mm panel design
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

assembly tool
Assembly tool

4 referenceholes.

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

board on assembly tool
Board on Assembly tool

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

board alignment
Board alignment

4 referenceholes.

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

board alignment1
Board alignment

2pins Ø5g6 X Ø5,5g6

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

board alignment2
Board Alignment

Ref.

Ref.

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

reference plugs gluing
Reference plugs gluing

Ø5.50

Ø5.0

Ø5.50

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

pcb alignment
PCB Alignment

Alignment pin

Reference plug glued

Cyanoacrylate 3M EC100

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

all plugs glued
All plugs glued

BoardAlignement

Ref.

Spacer

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

board installation on vacuum table
Board installation on Vacuum table

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

board indexation
Board indexation

Ref.

… vacuum pump ON

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

aluminium frame assembly
Aluminium frame assembly

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

aluminium frame assembly1
Aluminium frame assembly

2 referenceholes per profile

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

aluminium frame installation
Aluminium frame installation

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

honeycomb installation
Honeycomb installation

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

2 nd board installation on 2 nd vt
2nd board installation on 2nd VT

Ref.

Ref.

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

vacuum tables alignment
Vacuum Tables alignment

Vacuum Table Ref.

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

vacuum tables alignment1
Vacuum tables alignment

Precision shims (11,4mm)

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

polymerisation
Polymerisation

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

mesh support frame
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

mesh support frame1
Mesh support frame

Ground connection holes

Gas IN/OUT

Joint groove

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

mesh support frame2
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

board connection
Board connection

Fixation pins and ground connection

Board

Alignment pin

Deflection = 0.01mm

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

view of zebra connector encapsulated
View of Zebra connector encapsulated

Jordan Degrange - Francisco Perez Gomez CERN PH/DT

future plans and tasks 15 01 14
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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