Status report on MicroMegas
mechanics
CERN PH/DT
12/05/13Jordan Degrange / Francisco Perez Gomez CERN PH/DT
Concept remind Vacuum table manufacturing and
measurements MM panels design Future plans
12/05/13Jordan Degrange / Francisco 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
Jordan Degrange/Francisco Perez Gomez PH/DT
Concept (1/2)
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
Jordan Degrange / Francisco Perez Gomez PH/DT
Concept (2/2)
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 components
Jordan Degrange - 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)
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
MM Vacuum table (1300mmX600mmX60mm)
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Vacuum Table Cross section
Perforated Al honeycomb
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Vacuum table inserts
Jordan Degrange - 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 investigated.
Jordan Degrange - 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
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
4 reference holes.
Assembly tool
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Board on Assembly tool
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
4 reference holes.
Board alignment
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
2 pins Ø5g6 X Ø5,5g6
Board alignment
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Ref.
Ref.
Board Alignment
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Ø5.50
Ø5.0
Reference plugs gluing
Ø5.50
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
PCB Alignment
Alignment pin
Reference plug gluedCyanoacrylate 3M
EC100
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Ref.
Spacer
Board
Alignement
All plugs glued
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Board installation on Vacuum table
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Ref.
Board indexation
… vacuum pump ON
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Aluminium frame assembly
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
2 reference holes per profile
Aluminium frame assembly
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Aluminium frame installation
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Honeycomb installation
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Ref.
Ref.
2nd board installation on 2nd VT
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Vacuum Table Ref.
Vacuum Tables alignment
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Vacuum tables alignment
Precision shims (11,4mm)
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Polymerisation
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Assembled and glued on drift panel using alignment holes
Mesh glued on well defined surface.
Acts as gas manifold.
Large gluing area. Ground connection
Mesh support frame
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Mesh support frame
Joint groove
Ground connection holes
Gas IN/OUT
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Gas IN/OUT (Ø2,5mm)
Gas distribution channel
Gas distribution holes (Ø0.5mmØ1.5mm)
Cleaning channel
Surface glued on drift panel
Mesh support frame
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
Board connection
Alignment pin
Board
Fixation pins and ground connection
Deflection = 0.01mm
Jordan Degrange - Francisco Perez Gomez CERN PH/DT
View of Zebra connector encapsulated
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
Future plans and tasks 15.01.14