MICROMEGAS DETECTORS Status on mechanical prototypes construction @ - - PowerPoint PPT Presentation

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MICROMEGAS DETECTORS Status on mechanical prototypes construction @ - - PowerPoint PPT Presentation

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ATLAS - NSW (NEW SMALL WHEEL) MICROMEGAS DETECTORS Status on mechanical prototypes construction @ Saclay Patrick PONSOT for the Saclay ATLAS-Micromegas group MM weekly meeting 3 rd of December 2013 Irfu.cea.fr Outline M4 construction

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SLIDE 1

Irfu.cea.fr

MM weekly meeting – 3rd of December 2013

ATLAS - NSW

(NEW SMALL WHEEL)

MICROMEGAS DETECTORS Status on mechanical prototypes construction @ Saclay

Patrick PONSOT for the Saclay ATLAS-Micromegas group

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SLIDE 2

Outline

MM Weekly meeting - 3rd of December 2013 | PAGE 2 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • M4 construction
  • General considerations
  • Status of the M4 construction

 Gluing of the panels with the stiffback  Tooling to integrate the 4 meshes during the assembly

  • Qualification of the sandwiches (material) and of their assembly

(density of pillars inside the drift gap)

  • Definition of the mechanical characteristics  Bending tests on a qualified

machine

  • Testing with a 3 panels assembly
  • Design and drawings of the spacer and supports for the assembly
  • f the prototypes (Spacer@Freiburg, M1@LMU, M2@Roma, M3@Pavia,

M4@Saclay)

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SLIDE 3

M4 construction @ Saclay

MM Weekly meeting - 3rd of December 2013 | PAGE 3 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • General considerations
  • The context inside our institute on 2013 is very critical  better conditions

are expected after the signing of the MoU

 Sharing of the technicians with other projects  In almost of the cases, impossible to machine the pieces inside our mechanical workshop  Companies are not reactive for small production (e.g. we lost 6 weeks by waiting the delivery of the M4-frames)

  • Infrastructures

 The existing cleaning rooms are completely busy until 2017  We decided to build a new one dedicated to the assembly of large detectors  Part of the time is dedicated to the definition of this new cleaning room ISO-7 (specifications to take in account the tooling that we need)  Delivery of the cleaning room is expected on 2015 for production  The module zero must be built in the same temporary room as for prototypes  Increasing of the work to reinforce the cleanliness and to adapt the tooling for this temporary room.

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SLIDE 4

M4 construction @ Saclay

MM Weekly meeting - 3rd of December 2013 | PAGE 4 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • General considerations
  • New cleaning room will be equipped with 2 granite tables  specifications

and general drawings are ongoing

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SLIDE 5

M4 construction @ Saclay

MM Weekly meeting - 3rd of December 2013 | PAGE 5 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • General considerations
  • Temporary room (used for the barrel alignment production) has been

equipped with laminar airflux system  cleanliness and tooling must be improved to build the M0

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SLIDE 6
  • Status of the construction
  • M4 assembly will not be finished before the end of the year

 Gluing of the panels has just been begun  +10 days  Waiting for the 4 meshes and associate tooling done in the industry  delivery expected on week 51 (last open week before Xmas vacation)  Gluing of the pillars, mesh assembly, assembly of the module by gluing of the panels  +10 days  Due to the very bad tolerances that we found on the thickness of our aluminum honeycombs (~200 microns to compensate with the glue), few days have been dedicated to test the gluing procedure with the stiffback  Bad result with the glue DP490  peeling is very easy and capillarity of the glue is very bad (not enough glue on the cells of the honeycombs)  We decided to use the glue 2011 for the M4

M4 construction @ Saclay

MM Weekly meeting - 3rd of December 2013 | PAGE 6 CEA-Saclay/DSM/Irfu - Patrick PONSOT

~200 m

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SLIDE 7

M4 construction @ Saclay

MM Weekly meeting - 3rd of December 2013 | PAGE 7 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • Status of the construction
  • Gluing of the panels is in progress

 First drift panel made with 2x4 FR4 skins and aluminum honeycombs (glue 2011) has been glued on this morning (second step with the stiffback) Preparation of the second gluing step Vacuum bag on the stiffback

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SLIDE 8

M4 construction @ Saclay

MM Weekly meeting - 3rd of December 2013 | PAGE 8 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • Drift panel assembly procedure
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SLIDE 9

M4 construction @ Saclay

MM Weekly meeting - 3rd of December 2013 | PAGE 9 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • Status of the construction / gluing of the mesh
  • Mesh fixation on the M4 prototype

 Simplified design just to be able to study the deformation of the panel with the tension of the mesh  Common frame to close the gas-gap and to glue the mesh  4 enlarge frames (with mesh glued on it) have been

  • rdered in the Marabu company

 Delivery expected on week 51

  • Transfer frame and mechanics to position it have been
  • rdered  machining is in progress

 Transfer frame is fixed on the mesh frame  Mechanical adjustment to be in contact with the mesh during the gluing  Cutting of the mesh  Fixation on the panel  Dismounting of the transfer frame and measurement of the deformation and of the tension

Source: Marabu

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SLIDE 10

M4 construction @ Saclay

MM Weekly meeting - 3rd of December 2013 | PAGE 10 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • Status of the construction / gluing of the mesh

Mesh frame fixed on the transfer frame Enlarged frame with the mesh glued on it (provided by the industry) Transfer of the mesh

  • n the M4 frame

Vertical adjustment system

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SLIDE 11

Qualification of the sandwiches and of their assembly

MM Weekly meeting - 3rd of December 2013 | PAGE 11 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • What is the goal ?
  • A lot of simulation of the deformation of the MM sectors were done for the TDR,

to evaluate the impact of the material on the layout

 The main deformation is coming from the thermal loading  2 parameters must be taken in account: the thermal behavior of the assembly of the panels and the stiffness of the panels

  • A minimal value for the equivalent Young modulus of the panels has been

estimated  17GPa but:

 The segmentation has been changed (2 MM modules)  The detail design was not taken in account (interconnections of the panel)  Margin was applied on the boundary conditions:  2°C temperature gradient between the inner and outer panels (for commissioning on surface and running in the cavern)  Don’t forget that we need to guaranty that we will have no failure during the assembly, storage and transportation

  • Now with prototype experience and detailed design, we can do the reverse way

 Qualification of the material and mechanical prototypes  Full simulation of the MM sectors  Identification of the margin to take the decision (Aluminum, Nomex or foam?)

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SLIDE 12

Qualification of the sandwiches and of their assembly

MM Weekly meeting - 3rd of December 2013 | PAGE 12 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • Qualification / equivalent mechanical characteristics (material)
  • A protocol for testing has been proposed by Saclay

 Bending test (3 points) on a qualified testing machine (2 Instron machines at Saclay)  Testing of 3 samples  Dimensions of the samples : 110mmx17mmx~10mm  Measurement of the displacement according to the loading until the destroying of the sample

  • Calculation of the Young modulus

 FEA method to take in account the shear modulus, the poisson coefficients and the anisotropy of the material  Glue film is not modeling but the level of the shear stress between honeycomb and the skins is relevant and must stay under the limit for the glue

  • As requested by Italian colleagues last week (see talks of

Francesco and Stefano), we need to validate together the final protocol to qualify the material (additional test with larger samples?)

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SLIDE 13

Qualification of the sandwiches and of their assembly

MM Weekly meeting - 3rd of December 2013 | PAGE 13 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • First results have been presented by Fabien during the MM workshop on 5-6th
  • f November, here is the summary:
  • 2 samples (Nomex) have been received from Roma and will be measured asap

Honeycombs material Aluminum 5056

  • Comp. Distribution

4.8mm/0.05m 130kg/m3 Nomex Dupont-Nemours 4.8mm/0.05mm 48kg/m3 Foam Rohacell

  • 52kg/m3

Equivalent Young modulus (Gpa) 24 8 ~5 Shear stress for the glue (Mpa) 27-48 20-32 11 Comment on destroying Breaking of the FR4 and of the gluing Breaking of the gluing Breaking of the FR4 and of the gluing

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SLIDE 14

Qualification of the sandwiches and of their assembly

MM Weekly meeting - 3rd of December 2013 | PAGE 14 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • Applying of the qualification of the material with the

testing of the 3 panels assembly (first result presented by Fabien during the MM workshop on 5-6th of Nov.)

  • This 3 panels assembly has been done to study the

transmission of the deformation of the outer panel to the inner panel through the interconnections (glued pillars in the drift gap, Nomex honeycomb)

Measurement with local loading in the middle of the panel Calculation with thermal loading

  • 8 pillars are distributed on a panel 1.2mx0.6m (300mm between pillars in X-Y

direction)

  • Measurements are done between the pillars, first with screwing assembly (sliding is

possible), second with gluing of all the components

+2°C on all the top side

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SLIDE 15

Qualification of the sandwiches and of their assembly

MM Weekly meeting - 3rd of December 2013 | PAGE 15 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • First result (measurement/simulation) for local loading (220N) in the

middle of the panel with sliding of the panels

  • Measurement and simulations are coherent
  • Partial transmission between the top and the middle -0.997/-0.597 due to the

local loading between pillars

  • Similar deformation of the middle and bottom -0.597/-0.595

Location of the pillars

Panels P1-M P1-S P2-M P2-S P6-M P6-S Top

  • 0.125
  • 0.960
  • 0.997

Middle

  • 0.109
  • 0,123
  • 0.694
  • 0.606
  • 0.597
  • 0.597

Bottom

  • 0,105
  • 0.598
  • 0.595
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SLIDE 16

Qualification of the sandwiches and of their assembly

MM Weekly meeting - 3rd of December 2013 | PAGE 16 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • Second result (measurement/simulation) for local loading (220N) in the middle
  • f the panel without sliding of the top panel
  • Again, measurements and simulations are coherent
  • Partial transmission between the top and the middle -0.533/-0.177 due to the local

loading between pillars

  • Similar deformation of the middle and bottom -0.177/-0.172
  • Same effect as for sliding panels but with decreasing of the range due to the

increasing of the stiffness by interconnection of 2 panels

Location of the pillars

Panels P1-M P1-S P2-M P2-S P6-M P6-S Top

  • 0.034
  • 0.570
  • 0.533

Middle

  • 0.039
  • 0,033
  • 0.287
  • 0.220
  • 0.184
  • 0.177

Bottom

  • 0,031
  • 0.213
  • 0.172
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SLIDE 17

Qualification of the sandwiches and of their assembly

MM Weekly meeting - 3rd of December 2013 | PAGE 17 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • Simulation for thermal loading without sliding of the panels (gluing of

the 3 panels)

  • Similar phenomenom as for local loading

Location of the pillars

Panels P1-S P2-S Middle point P6-S Top 0.008 0.013 0.026 0.017 Middle 0.005 0.007 0.012 0.011 Bottom 0.004 0.002 0.004 0.006 +2°C on all the top side

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SLIDE 18

Qualification of the sandwiches and of their assembly

MM Weekly meeting - 3rd of December 2013 | PAGE 18 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • Conclusion about the assembly of the panels
  • Simulation and measurements are coherent
  • Interconnections are very efficient to increase the stiffness of the modules
  • The density of the interconnections should be adjusted to optimize the

transmission of the deformation from the outer to the inner panels

  • Next step: Simulation with distribution of the pillars in staggered rows for

a complete module

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SLIDE 19

Design and drawings of the spacer and of the supports for the assembly

MM Weekly meeting - 3rd of December 2013 | PAGE 19 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • The design of the spacer have been completed with:
  • Additional adjustment pieces to be able to mount the kinematic support

(limited range of the bearings)

  • Rotating system to have access for measurement of the 2 sides with CMM

machine (3 external targets will be added to have a common reference plan for the 2 measurements  calculation is in progress

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SLIDE 20

Design and drawings of the spacer and supports for the assembly

MM Weekly meeting - 3rd of December 2013 | PAGE 20 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • All the drawings have been done. They are updated with the feedback
  • f our Freiburg colleagues (in progress)
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SLIDE 21

Summary

MM Weekly meeting - 3rd of December 2013 | PAGE 21 CEA-Saclay/DSM/Irfu - Patrick PONSOT

  • Specifications for the construction of the new cleaning room at Saclay are
  • ngoing
  • Reinforcement of the cleanliness of the temporary room to be able to build

the M0 before delivery of the new cleaning room

  • M4 panels construction is in progress
  • M4 assembly is expected on mid-January 2014 (waiting for the mesh)
  • Qualification protocol for material should be validated inside the

collaboration

  • Qualification of the assembly is ongoing (testing with a 3 panels assembly)
  • Drawings of the spacer and supports for testing of the mechanical

prototypes at Freiburg are available (validation is in progress  calculation and feedback)

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SLIDE 22

DSM Irfu SIS/LCAP (PC N°12, Bt 123) Patrick PONSOT Commissariat à l’énergie atomique et aux énergies alternatives Centre de Saclay | 91191 Gif-sur-Yvette Cedex

  • T. +33 (0)1 69 08 79 30 | F. +33 (0)1 69 08 89 47

Etablissement public à caractère industriel et commercial | RCS Paris B 775 685 019

MM Weekly meeting - 3rd of December 2013

Thank you for your attention !

CEA-Saclay/DSM/Irfu - Patrick PONSOT | PAGE 22