Status report on micromegas mechanics
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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