FBauer PDanielThomas EFerrerRibas ChFlouzat JGalan WGamache AGiganon PFGiraud PGraffin SHerlant SHervé FJeanneau HLeProvost OMeunier APeyaud PhSchune ATLASNSW FRASCATI MMM workshop ID: 377494
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Slide1
Patrick PONSOT for the CEA-Saclay-Irfu group:F.Bauer, P.Daniel-Thomas, E.Ferrer-Ribas, Ch.Flouzat, J.Galan, W.Gamache, A.Giganon, P-F.Giraud, P.Graffin, S.Herlant, S.Hervé, F.Jeanneau, H.LeProvost, O.Meunier, A.Peyaud, Ph.Schune
ATLAS-NSWFRASCATI MMM workshopSaclay plan
29-30th of November 2012Slide2
OUTLINE2012/11/29-30| 2Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTDesign ideasSaclay’s baseline / size of the wedges (quadruplets)Possible mechanical design of a quadrupletDedicated frame to fix the mesh and the drift electrodePositioning of the doubletsAlignable ?MaterialsProposal to build an operational quadrupletLearning about procedures (gluing, positioning,…etc.)
Checking all parameters (precision, in-plane alignment, electronics, RO mapping, services…etc.)
Assembly ideasAssembly procedure of the quadruplets (some remarks)
Assembly of the quadruplets to form a wedge, a station, a sector ?In-plane alignment ?Mechanical prototypes and task sharing
ObjectivesControl of the geometry (precision of the construction)Control of the deformation (in-plane alignment)Behavior of a doublet (with and without pillars) ?FEA - Thermo-mechanical simulations
Schedule and sharing of
workSlide3
OUTLINE2012/11/29-30| 3Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTDesign ideasSaclay’s baseline / size of the wedges (quadruplets)Possible mechanical design of a quadrupletDedicated frame to fix the mesh and the drift electrodePositioning of the doubletsAlignable ?Materials
Proposal to build an operational quadrupletLearning about procedures (gluing, positioning,…etc.)
Checking all parameters (precision, in-plane alignment, electronics, RO mapping, services…etc.)
Assembly ideasAssembly procedure of the quadruplets (some remarks)Assembly of the quadruplets to form a wedge, a station, a sector ?
In-plane alignment ?Mechanical prototypes and task sharingObjectivesControl of the geometry (precision of the construction)
Control of the deformation (in-plane alignment)
Behavior of a doublet (with and without pillars) ?
FEA - Thermo-mechanical simulations
Schedule and sharing of
workSlide4
Introduction2012/11/29-30| 4Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTA report has been written to describe the Saclay’s plan for the mechanical architecture of the micromegas wedges Slide5
DESIGN IDEAS2012/11/29-30| 5Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTSaclay’s baseline = 2 Wedges made of 4 Modules with maximum size ~2m2As reminder : MM Module = Quadruplet = 4 planes in Z directionWhy ?We think that it is not possible to reach the perpendicular required precision of the strips by assembly of 4 planes with a very large area (large sector ~6m2)
In spite of a lot work, we never reached this range of precision during the construction of the ALICE muon panels (carbon fibers panels)Using our experience on CTA mirror (very recent tests), we think that we can reach the precision for a 2m2
area
At
the end we need :sMM < 100 mm (micro-TPC mode)strip parallelism: ≤ 40
m
m
Mechanical precision perpendicular to
strip plane:
<150
m
m at 15° (inner quadruplets)
< 80
m
m at 30° (outer quadruplets)
Very complicated to realize the 2D read-out mapping and to connect the Y strips through the full length of the wedge (~3.7m)
Views on next slidesSlide6
DESIGN IDEAS2012/11/29-30| 6Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTSaclay’s baseline = 2 Wedges made of 4 Modules with maximum size ~2m2As reminder : MM Module = Quadruplet = 4 planes in Z directionWhy ?From our experience:
MM Compass
(G10)
Alice / Carbon panels
MM T2K
(G10)
CTA mirrors
(Carbon, G10, Al.)Slide7
DESIGN IDEAS
2012/11/29-30| 7
Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT
Possible mechanical design of a quadruplet (scheme)Central panel is the mechanical support (thickness at least 20mm to define by FEA, and to test with prototypes)
At least ~75mm
At least ~20mm
Fixation (and gluing?) of the mesh frame
Possible to put an interface to connect the supports
Assembly of the quadruplet after positioning of the 2 doublets
Mechanical reference system to position the 2 doublets (metallic inserts)
This part of the central panel can be local or all along the sector
If needed, pillars
Doublet
Doublet
(Not up to date)Slide8
DESIGN IDEAS2012/11/29-30|
8Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT
Possible mechanical design of a quadruplet (scheme)
Supporting of 2 quadruplets, in-plane alignment system → Local links (to confirm by FEA)
In plane alignment to connect the 2 quadruplets
Local supports
~75mm
At least ~225mm
The 2 MM wedges are linked by local supports
(kinematic links)
Bar support to link the 4 modules
(Not up to date)
(Not up to date)Slide9
DESIGN IDEAS2012/11/29-30|
9Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT
Possible mechanical design of a quadruplet (scheme)
Supporting of 2 quadruplets, in-plane alignment system → If local links are not enough, by using a spacer-frame
In plane alignment to connect the 2 quadruplets
T
he 3 kinematics supports can be fixed on the spacer-frame
At least ~225mm
The 2 MM wedges are linked by a spacer-frame
(kinematic links, holes to have access to the electronic)
~75mm
(Not up to date)
(Not up to date)Slide10
DESIGN IDEAS
2012/11/29-30|
10
Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTPossible mechanical design of a quadruplet (scheme)Dedicated frame to fix the drift cathode and the mesh ?
A transfer frame can be used for mounting
Fixation (and gluing?) of the mesh frame
Cathode made of kapton or mylar + Copper or al.
Mesh
Transfer frame to maintain the tension inside the mesh and cathode
(Not up to date)Slide11
DESIGN IDEAS
2012/11/29-30|
11
Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTPossible mechanical design of a quadruplet (scheme)Positioning of the 2 doublets
By using metallic inserts glued with high precision during the construction of the doubletsTargets reference on PCBs to glue the inserts and to check the alignment of the 2 doubletsZ positioning of the doublets is done also by using the inserts (on doublets and on central panel, precise thickness)Mechanical reference system to position the 2 doublets (metallic inserts)
Assembly of the quadruplet after positioning of the 2 doublets
(Not up to date)Slide12
DESIGN IDEAS2012/11/29-30| 12Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTPossible mechanical design of a quadruplet (scheme)Alignable (in-plane alignment is on the outside panel) ?How can we guaranty that the stiffness of the doublets is enough to control the Z position of the strips inside a quadruplet (// of the doublets after deformation due to thermo-mechanical loading) ?Testing is needed to know the relative deformation of each panel inside a quadruplet
If result is negative, pillars (or other spacer) should be glued in the drift gap (40 pillars diameter 5mm is less than 0.2% of the detection area)More difficult to glue the pillars with separate mesh (no bulk), and with separate drift cathode
If needed, pillars
5 mm
Gluing on few additional and larger pillars ?
5 mm
// strips
No bulk
Bulk
Deformation with thermal loading is not symmetric
(Not up to date)Slide13
DESIGN IDEAS2012/11/29-30| 13Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTPossible mechanical design of a quadruplet (scheme) → MaterialsHoneycomb should be perforated (or porous) to use the vacuum pumping for gluing MaterialsMass density (g/cm3)Young modulus(Gpa)CTE(ppm/°C)G10/FR4(Epoxy-glass)
1.9~1710-20Copper
8.9~120
16-17Honeycomb (6mm) - “paper”~0.032Honeycomb (6mm) - aluminum (50µm perforated)
~0.040~7623Pyralux PC1025 (photoimagable film)tbdtbd (global test of PCBs)
100-130
Tensile tests in 3 directions to evaluate the Young modulus of the PCBs has been done at Saclay
L (length direction) → 24 Gpa
l
(width direction) → 21 Gpa
p (45°) → 17 Gpa
Very important parameter : ageing of the material should be studied before to use them
(e.g. zebra connectors are made of silicon elastomer which has a bad withstand to radiation)Slide14
OUTLINE2012/11/29-30| 14Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTDesign ideasSaclay’s baseline / size of the wedges (quadruplets)Possible mechanical design of a quadrupletDedicated frame to fix the mesh and the drift electrodePositioning of the doubletsAlignable ?Materials
Proposal to build an operational quadrupletLearning about procedures (gluing, positioning,…etc.)
Checking all parameters (precision, in-plane alignment, electronics, RO mapping, services…etc.)
Assembly ideasAssembly procedure of the quadruplets (some remarks)Assembly of the quadruplets to form a wedge, a station, a sector ?
In-plane alignment ?Mechanical prototypes and task sharingObjectivesControl of the geometry (precision of the construction)
Control of the deformation (in-plane alignment)
Behavior of a doublet (with and without pillars) ?
FEA - Thermo-mechanical simulations
Schedule and sharing of
workSlide15
PROPOSAL to build a quadruplet2012/11/29-30| 15Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTBuilding an operational quadruplet (~1m x ~0.5m) within the collaborationNot a critical milestoneBut necessary part of the Saclay’s development plan to prove to the CEA-Saclay-Irfu management team that the assembly of 4 MM planes will be completely understood before the construction of a module zero (to get resources to prepare the production)ObjectivesLearning about procedures (gluing, positioning,…etc.)
Checking all parameters (precision, in-plane alignment, electronics, RO mapping, services…etc.)
Testing inside a precise cosmic benchSlide16
PROPOSAL to build a quadruplet2012/11/29-30| 16Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTBuilding an operational quadruplet (~1m x ~0,5m) within the collaborationNot a critical milestoneThis prototype will allow checking of the: design and manufacturing of the componentsassembly proceduremechanical precisionin-plane alignment method
2D read-out mappingelectronics implementationcosmic
testsservices (HV, gas,
…)… To be discussed within the collaboration: Tasks sharing within the collaborationParallel
testing ?Using of existing precise cosmic benchSlide17
OUTLINE2012/11/29-30| 17Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTDesign ideasSaclay’s baseline / size of the wedges (quadruplets)Possible mechanical design of a quadrupletDedicated frame to fix the mesh and the drift electrodePositioning of the doubletsAlignable ?Materials
Proposal to build an operational quadrupletLearning about procedures (gluing, positioning,…etc.)
Checking all parameters (precision, in-plane alignment, electronics, RO mapping, services…etc.)
Assembly ideasAssembly procedure of the quadruplets (some remarks)Assembly of the quadruplets to form a wedge, a station, a sector ?
In-plane alignment ?Mechanical prototypes and task sharingObjectivesControl of the geometry (precision of the construction)
Control of the deformation (in-plane alignment)
Behavior of a doublet (with and without pillars) ?
FEA - Thermo-mechanical simulations
Schedule and sharing of
workSlide18
ASSEMBLY IDEAS2012/11/29-30| 18Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTAssembly procedure of the quadruplets (some remarks)Due to experience of the institutes, we think that it is accessible to define precise tooling and procedures to build and to align the components but we will use a new material → large PCBs made of composite materials: G10, pyralux, copper…etc.Gluing procedure by using vacuum should be tested with real PCBs as soon as possible to answer to the following questions :What is the best choice for materials to control the geometry during the production (stability, reproducibility) ?
Will the PCBs follow the granite table flatness ?
Will the PCBs stay flat after gluing of the honeycomb (temperature and humidity inside the cleaning room to do the gluing) ?
Do we get the // for the doublets by using the stiffback ?Slide19
ASSEMBLY IDEAS2012/11/29-30| 19Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTAssembly procedure of the quadruplets or wedges (some remarks)A preliminary study has been done to evaluate the infrastructures and tooling that is needed to build quadrupletsThe building of the second ring of quadruplets has been used as main hypothesis to do this studyWe need a large cleaning room to do all the steps (2 gluing tables, 3 assembly tables)Unfortunately, the Saclay’s cleaning rooms are not available on 2013-2014. And we are not sure to get a new one. The construction of the operational quadruplet prototype will influence also the final decisionWe need one year to create a new cleaning roomIt is very important to take in account the infrastructures that we need to define the size of the modules that we can build (wedges ~6m
2 or quadruplets ~2m2)May be the assembly should be done at CERN in a large cleaning room with participation of institutes
Preliminary study to define a new infrastructureSlide20
ASSEMBLY IDEAS
2012/11/29-30
|
20
Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTAssembly of quadruplets to form a wedge, a station, a sector ?
MM Wedges vs MM quadruplets
sTGC wedges can be added with the same principle
3 kinematic supports to fixe the 2
wedges
3 kinematic supports to fixe the spacer-frame
~5.87m
2
~1.89 m
2
~1.85 m
2
~1.33 m
2
~
0.80 m
2Slide21
ASSEMBLY IDEAS
2012/11/29-30
|
21
Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTIn-plane alignment system
To be defined with specialists
In-plane with 2 functions (to follow the 2 wedges)
3 kinematic supports to fixe the 2
wedges
3 kinematic supports to fixe the spacer-frameSlide22
OUTLINE2012/11/29-30| 22Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTDesign ideasSaclay’s baseline / size of the wedges (quadruplets)Possible mechanical design of a quadrupletDedicated frame to fix the mesh and the drift electrodePositioning of the doubletsAlignable ?Materials
Proposal to build an operational quadrupletLearning about procedures (gluing, positioning,…etc.)
Checking all parameters (precision, in-plane alignment, electronics, RO mapping, services…etc.)
Assembly ideasAssembly procedure of the quadruplets (some remarks)Assembly of the quadruplets to form a wedge, a station, a sector ?
In-plane alignment ?Mechanical prototypes and task sharingObjectivesControl of the geometry (precision of the construction)
Control of the deformation (in-plane alignment)
Behavior of a doublet (with and without pillars) ?
FEA - Thermo-mechanical simulations
Schedule and sharing of workSlide23
MECHANICAL PROTOTYPES2012/11/29-30| 23Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTObjectivesControl of the geometry (precision of the construction)Control of the deformation (to define the in-plane alignment)Study of the geometry of a doubletStiffness of the composite panel (PCBs + honeycombs + frames)Gluing test of 2 PCBs on the honeycomb (vacuum)
Using of a composite stiffback
Saclay’s plan:
Gluing of honeycomb on standard PCBs to evaluate the stiffness of a support panelGluing of honeycomb on large MM PCBs (paper honeycomb, perforated aluminum honeycomb…etc.)
Options:Sharing of the tasks and parallel testing with real PCBs (bulk & no bulk ?)Slide24
MECHANICAL PROTOTYPES2012/11/29-30| 24Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTStudy of the deformation of a quadrupletFEA to predict the deformations: to choose the size of the mechanical prototypeMeasurement without and with pillarsMechanical and thermal loadingsSaclay’s plan:Construction of mechanical structure equivalent to a MM doublet (G10 + honeycomb)Dismountable to test without and with pillarsHoles in the external panels allow mechanical measurements on the central panel
Assembly with and without expandable pins to study the effect of the sliding of the frames
Options:
To build an equivalent quadruplet (5 panels)
To build an assembly of 2 doublets (2x3 panels)To use other materials (e.g. aluminum honeycomb, PCBs…etc.)Slide25
Study of the gluing of pillarsQualification of the gluingChoice of material for the pillars (Macor, peek…)Saclay’s plan:Tooling is under manufacturing200 pillars have been ordered (Macor, peek, different geometry to put the glue)Options:
Testing of other solutions and materials to guarantee a similar behavior of each MM plane after stacking
MECHANICAL PROTOTYPES
2012/11/29-30| 25
Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTSlide26
MECHANICAL PROTOTYPES2012/11/29-30| 26Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTStudy of the positioning inside a quadrupletAs described on slide 11 (positioning of the 2 doublets)Saclay’s plan:Building of a simplified quadruplet (e.g. with the doublets created during other tests)
Options:
Parallel testing
Other solution such as optical systems
sTGC proposalSlide27
Thermo-mechanical simulations2012/11/29-30| 27Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTFEA analysisPreliminary FEA analysis have been done to:provide arguments in order to make a decision concerning the layoutIdentify the main cause of irregular deformation → thermal loadingWe need engineering models to:Confirm that we can control the geometry with the alignment system according to the different options (quadruplets, wedges, stations, sectors…)
Thermal expansion MM+sTGC ~100µm
Temperature gradient 2°C ~50µmSlide28
Thermo-mechanical simulations2012/11/29-30| 28Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTFEA analysisPreliminary study of the behavior of a mixed sector (sTGC wedges + MM quadruplets fixed on a spacer frame) w.r.t. the position on the small wheelIn this case, MM deformation is around ~100µm
Vertical sector
Horizontal sector
Sector at 45°If we are not able to measure this type of deformation with the alignment system, we must guaranty that we will stay under these 100µmSlide29
Schedule and sharing of work2012/11/29-30| 29Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTPreliminary scheduleHelp from collaboration is needed and is welcome : Task and cost sharingTo participate to this program and/or to complete itSlide30
Conclusion2012/11/29-30| 30Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOTSharing of work and parallel testing within the collaboration are welcome to cover this plan as soon as possibleMechanical testsFEA analysisOperational quadrupletIn-plane alignmentAssembly of the quadruplets or wedgesThe largest cleaning rooms at Saclay will not be available on 2013-2014
The possibility to use a cleaning room at CERN should be evaluateSlide31
DSM IrfuSIS/LCAP (PC N°12, Bt 123)Patrick PONSOTCommissariat à l’énergie atomique et aux énergies alternativesCentre de Saclay | 91191 Gif-sur-Yvette CedexT. +33 (0)1 69 08 79 30 | F. +33 (0)1 69 08 89 47Etablissement public à caractère industriel et commercial | RCS Paris B 775 685 0192012/11/29-30Thank you for your attention !
Frascati MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT
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