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Status report on MicroMegas
mechanics
CERN PH/DT
30/01/14Francisco Perez Gomez CERN PH/DT
Concept remind Vacuum table manufacturing and
measurements MM panels design Construction of the first panel
◦ Measurements and results Status and future plans
30/01/14Francisco Perez Gomez CERN PH/DT
Content
A sandwich of two soft skin is glued without mechanical constraints.
A sandwich is:o One glass fibre skin (0.5mm)o Aluminium honeycomb surrounded with an aluminium frameo Second glass fibre skin (0.5mm)
Sandwich schematic view
Francisco Perez Gomez CERN PH/DT
Concept (1/2)
30/01/14
Manufacturing concepto The skins are sucked with two vacuum tableso The vacuum table surfaces are perfectly flato The vacuum table surfaces are set in parallel position
Francisco Perez Gomez CERN PH/DT
Concept (2/2)
30/01/14
Dimensions: 1300X600 Manufactured at CERN Use granite table (flatness
<10 mm) as mould 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 components
30/01/14Francisco Perez Gomez CERN
PH/DT
Francisco Perez Gomez CERN PH/DT
Vacuum table exploded view
Gel coat + Glass fibre (3.5mm)
Glass fibre (3mm)
Perforated Al Honeycomb (60mm)
Al profile (60X30mm)Al inserts
(Ø40mm)30/01/14
Francisco Perez Gomez CERN PH/DT
MM Vacuum table (1300mmX600mmX60mm)
30/01/14
Francisco Perez Gomez CERN PH/DT
Vacuum Table Cross section
Perforated Al honeycomb
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Francisco Perez Gomez CERN PH/DT
Vacuum table inserts
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Francisco Perez Gomez CERN PH/DT
Vacuum table QC
CERN Metrology lab CERN PH/DT
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 taken into account (work at constant temperature ± 0.2°C).
30/01/14
Francisco Perez Gomez CERN PH/DT
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
MM panel Design
30/01/14
Francisco Perez Gomez CERN PH/DT
4 reference holes.
Assembly tool
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Francisco Perez Gomez CERN PH/DT
4 reference holes.
Board alignment on assembly tool
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Francisco Perez Gomez CERN PH/DT
Ref.
Ref.
Board Alignment
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2 pins Ø5g6 X Ø6,5g6
Francisco Perez Gomez CERN PH/DT
Ø5.50
Ø5.0
Reference plugs gluing
Ø5.50
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Francisco Perez Gomez CERN PH/DT
Reference plugs gluing
Alignment pin
Reference plug glued
Cyanoacrylate 3M
EC50
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Francisco Perez Gomez CERN PH/DT
Ref.
Spacer
Board
Alignement
All plugs glued
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Francisco Perez Gomez CERN PH/DT
Ref.
Board installation and indexation on vacuum table
… vacuum pump ON
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Francisco Perez Gomez CERN PH/DT
Aluminium frame assembly
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Francisco Perez Gomez CERN PH/DT
2 reference holes per profile
Aluminium frame assembly
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Francisco Perez Gomez CERN PH/DT
Aluminium frame installation
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Francisco Perez Gomez CERN PH/DT
Honeycomb installation
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Francisco Perez Gomez CERN PH/DT
Ref.
Ref.
2nd board installation on 2nd VT
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Francisco Perez Gomez CERN PH/DT
Vacuum Table Ref.
Vacuum Tables alignment
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Francisco Perez Gomez CERN PH/DT
Vacuum tables alignment
Precision shims (11,6mm)
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Francisco Perez Gomez CERN PH/DT
Polymerisation
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Francisco Perez Gomez CERN PH/DT
Real Assembly of the first panel
30/01/14
30/01/14Francisco Perez Gomez CERN
PH/DT
Real assembly of the first panel
Francisco Perez Gomez CERN PH/DT 30/01/14
Real Assembly of the first panel
Francisco Perez Gomez CERN PH/DT
Real Assembly of the first panel
30/01/14
Results….
Upper side view Some measurements
Top side flatness: 160µm (max-min)
Bottom side flatness: 90µm (max-min)
30/01/14Francisco Perez Gomez CERN
PH/DT
30/01/14Francisco Perez Gomez CERN
PH/DT
Results I Planarity: 40 µm (rms)
30/01/14Francisco Perez Gomez CERN
PH/DT
Results II Planarity: 22 µm (rms)
Idea: Produce a spacer made from several pieces.
Straight pieces have the same profile with different lengths for mass production
Two symetric models of corner piecesTwo ref holes/ element for alignment
Use granite table in order to obtain a flat, parallel and precise surface for the gluing of the mesh
Liquid glue (Axson Epolam 5015) for the mesh gluing
Use “capillary effect”
Francisco Perez Gomez CERN PH/DT
Spacer and mesh gluing
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Francisco Perez Gomez CERN PH/DT
Assembled and glued on drift panel using alignment holes
Mesh glued on well defined surface.
May act as gas manifold.
Large gluing area. Ground connection
Mesh support frame (Spacer)
30/01/14
Francisco Perez Gomez CERN PH/DT
Spacer gluing on drift panel procedure
The gluing procedure is first tested in a smaller prototype (200X200mm) In particular the assembly of the corner pieces and leak tightness were verified.
Create a new plane, parallel to drift panel
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Drift
Gluing zonesDrift
Francisco Perez Gomez CERN PH/DT 30/01/14
Laying on precise shims on granite table
Teflon pins
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PH/DT
Mesh gluing on dedicated tool
Plexiglass mould
Mesh frame
Mesh support installed under “press”
Francisco Perez Gomez CERN PH/DT
Injection of glue
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Injection points distance 100mm
Francisco Perez Gomez CERN PH/DT
Mesh after polymerisation
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Planarity 40µm
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 CERN PH/DT
STATUS“Future plans and tasks 15.01.14”
30/01/14
Understand deformations on the first panel Improve and tune the panel manufacturing
procedure Build the first real panel ….
Francisco Perez Gomez CERN PH/DT
Future Plans
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Francisco Perez Gomez CERN PH/DT
spares
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Francisco Perez Gomez CERN PH/DT
Zebra connector for FE connection
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Francisco Perez Gomez CERN PH/DT
Board connection
Alignment pin
Board
Fixation pins and ground connection
Deflection = 0.01mm
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Francisco Perez Gomez CERN PH/DT
View of Zebra connector encapsulated
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