Irfu.cea.fr ATLAS-NSW CERN MMM WORKSHOP MM WEDGES MADE OF 4 MODULES of February 2013 Patrick PONSOT for the CEA-Saclay-Irfu group: F.Bauer, P.Daniel-Thomas, E.Ferrer-Ribas, J.Galan, W.Gamache, A.Giganon, P-F.Giraud, P.Graffin, S.Hassani, S.Herlant, S.Hervé, F.Jeanneau, H.LeProvost, O.Meunier, A.Peyaud, Ph.Schune

OUTLINE 2013/02/21-22 | PAGE 2 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Layout with MM wedge made of 4 modules (quadruplets) Version C to take in account the envelope of the sector Version D in progress to simplify the layout (ATLAS layout drawing is available on CDD: ATUMHS___0004)  Design of the spacer-frame and of the module A composite architecture with in-plane corridors included Quadruplets are fixed with 4 kinematic mounts  sTGC wedge interface : 2 cases The weight of the sTGC wedge is directly transferred to the structure of the wheel The sTGC wedge is fix on the spacer-frame  Mechanical simulations The spacer frame is fixed on the wheel with 3 kinematic supports The spacer frame is fixed on the wheel with 4 kinematic supports  Thermal simulations A first approach with temperature gradient (electronic power deposition?)

LAYOUT OF THE MM MODULES 2013/02/21-22 | PAGE 3 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  The assembly drawing has been updated (version C) and provided to the MM community on the 13 th of February, but new modifications should be taken in account

LAYOUT OF THE MM MODULES 2013/02/21-22 | PAGE 4 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  From version B to version C The sectors have been enlarged to increase the azimuthal overlaps Inner radius has been reduced from 982 to 917mm, to increase the active area (eta=2.7) No change for outer radius (eta=1.3) to keep clearance w.r.t. the position of the EIL4 chamber

LAYOUT OF THE MM MODULES 2013/02/21-22 | PAGE 5 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  A reference drawing has been provided to define the NSW envelope in ATLAS environment (ATUMHS___0004 on CDD) Large and small MM modules must be modified according to their integration in the envelopes of the sectors

LAYOUT OF THE MM MODULES 2013/02/21-22 | PAGE 6 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Exchange of 3D models has been initialized to have more realistic dimensions to define the alignment system, the services and kinematic supports FE electronics and services should be defined asap to check if we have enough space inside the spacer-frame (~50mm) 100mm space has been required between the wheel structure and the envelope of the sectors to be able to fix the sectors on the structure In-plane alignment must be added (additional bars or using of the spacer-frame?)

CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT LAYOUT OF THE MM MODULES 2013/02/21-22 | PAGE 7  Next step: From version C to version D Optimization of the size of the MM modules to stay inside the envelopes without lost of the overlaps Simplification of the shape of the sectors, if simplification of the structure of the wheel is possible and if the “ears” are not necessary for overlaps Increasing of space for in-plane alignment system if we cannot add the new longer bars inside the spokes (if using spacer-frame instead of the bars is possible?)

DESIGN OF THE SPACER-FRAME 2013/02/21-22 | PAGE 8 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  A composite architecture with in-plane corridors included (~130kg) Spacer = Central plates = Rohacell 30mm (or honeycomb) + 2 FR4 laminates 0.5mm Discontinuous central plate to provide space for alignment corridors Frame = T profiles = aluminum profiles Holes for alignment corridors 2 aluminum T profiles 12 central plates (Rohacell +FR4) kinematic mount M4 M3 M2 M1

DESIGN OF THE MODULE 2013/02/21-22 | PAGE 9 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  The quadruplets are made of PCBs (0.5mm), G10 laminates (0.5mm) and honeycombs (~10mm) The weight of the 8 MM is ~440Kgs Services are not included M4 M3 M2 M1 Mass of quadruplets (Kg) M475 M365 M250 M130 M1 Each module is fixed on the frame with 4 kinematic mounts

sTGC WEDGES INTERFACE 2013/02/21-22 | PAGE 10 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Case 1: The weight of sTGC wedge is directly transferred to the structure of the wheel The kinematic mounts of the sTGC wedge can be installed on the spacer-frame but exactly at the same location of the kinematic mounts of the spacer-frame The handling of the full sector must be done with the same conditions Principle Kinematic mount of the sector Kinematic mount of the sTGC wedge Same location for the kinematic mounts

sTGC WEDGES INTERFACE 2013/02/21-22 | PAGE 11 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Case 2: The sTGC wedge is fixed on the spacer-frame The design of the spacer-frame should take in account the weight of the 2 sTGC wedges (local reinforcement of the T profiles) Fixation of sTGC directly on the spacer-frame

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 12 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  The goal is to have under control the absolute positioning of the MM modules and sTGC wedges The mechanical structure of the spacer-frame should limit the displacement of each module and wedge under microns (strips and wires must be parallel)  Loading conditions Self weight In all cases the tilt of the wheel at 0.7° is considered  Boundary conditions Degrees of freedoms are driven by the location of the different kinematic mounts 1 (or 2) fully sliding link 1 unidirectional sliding link (2 nd coordinate) 1 pivot link

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 13 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  A first set of simulations have been done With 3 kinematic mounts at optimized location (“bessel points”) Location of degrees of freedom (different kinematic mounts) has been changed according to the orientation of the sectors, for spacer-frame and also for modules Equivalent Young modulus has been used for the modules Case1: Without the sTGC weight MaterialAluminumFR4RohacellModule Density (Kg/m 3 ) Equivalent Young modulus (MPa)

MECHANICAL ANALYSIS 2013/02/08 | PAGE 14 CEA-Saclay/DSM/Irfu/SIS/LCAP - Patrick PONSOT  Vertical sector 05 with the optimization of the kinematic mounts Pivot link Unidirectional link (2 nd coordinate) Fully sliding link

MECHANICAL ANALYSIS 2013/02/08 | PAGE 15 CEA-Saclay/DSM/Irfu/SIS/LCAP - Patrick PONSOT  Vertical sector 05 with the optimization of the kinematic mounts Sector (spacer- frame + modules) Spacer-frame only Modules only (Quadruplets) Maximum displacement ~0.06mm Maximum displacement ~0.1mm

MECHANICAL ANALYSIS 2013/02/08 | PAGE 16 CEA-Saclay/DSM/Irfu/SIS/LCAP - Patrick PONSOT  Vertical sector with the optimization of the kinematic mounts: Displacement of modules on each direction X displacement 0 to Y displacement 0 to +0.06mm Z displacement to 0mm

MECHANICAL ANALYSIS 2013/02/08 | PAGE 17 CEA-Saclay/DSM/Irfu/SIS/LCAP - Patrick PONSOT  Horizontal sector with the optimization of the kinematic mounts Pivot link Unidirectional sliding link (2 nd coordinate) Fully sliding link

MECHANICAL ANALYSIS 2013/02/08 | PAGE 18 CEA-Saclay/DSM/Irfu/SIS/LCAP - Patrick PONSOT  Horizontal sector with optimization of the kinematic mounts Sector (spacer- frame + modules) Modules only (Quadruplets) Maximum displacement ~0.02mm Spacer-frame only Maximum displacement ~0.03mm

MECHANICAL ANALYSIS 2013/02/08 | PAGE 19 CEA-Saclay/DSM/Irfu/SIS/LCAP - Patrick PONSOT  Horizontal sector with the optimization of the kinematic mounts: Displacement of modules on each direction X displacement 0 to +0.01mm Z displacement to +0mm Y displacement -0.01to 0mm

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 20 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  A second set of simulations have been done With 4 kinematic mounts on the spacer-frame To use the same location as for sTGC supports To be far away from the center of the wheel (small space between spokes) The stiffness of each panel of the module has been considered Case1: Without sTGC weight MaterialAluminumFR4Rohacell G10 Density (Kg/m 3 ) Young modulus (MPa) kinematic mounts

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 21 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Vertical sector 05 with optimization of the kinematic mounts Sector (spacer- frame+modules) Spacer-frame only Modules only (Quadruplets) Maximum displacement ~0.05mm Maximum displacement ~0.06mm

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 22 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Vertical sector 13 at 180° Fully sliding links Unidirectional sliding link (2 nd coordinate) Pivot link Fully sliding links Pivot link Unidirectional sliding link (2 nd coordinate)

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 23 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Vertical sector 13 at 180° with optimization of the kinematic mounts Sector (spacer- frame+modules) Spacer-frame only Modules only (Quadruplets) Maximum displacement ~0.07mm Maximum displacement ~0.1mm

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 24 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Sector at 45° Fully sliding links Unidirectional sliding link (2 nd coordinate) Pivot link Fully sliding links Pivot link Unidirectional sliding link (2 nd coordinate)

Displacement of the modules will be reduced by changing of the location of the unidirectional sliding of the modules MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 25 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Sector at 45° without optimization of the kinematic mounts (worst case) Sector (spacer- frame+modules) Spacer-frame Modules (Quadruplets) Maximum displacement ~0.18mm Maximum displacement ~0.18mm

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 26 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Horizontal sector Fully sliding links Unidirectional sliding link (2 nd coordinate) Pivot link Fully sliding links Pivot link Unidirectional sliding link (2 nd coordinate)

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 27 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Horizontal sector with optimization of the kinematic mounts Sector (spacer- frame+modules) Modules only (Quadruplets) Maximum displacement ~0.03mm Spacer-frame only Maximum displacement ~0.04mm

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 28 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Statement (without thermal analysis) : With 4 kinematic mounts on the spacer-frame which are not at the optimized position (not at “Bessel point”), it should be possible to keep the displacement of the MM modules under 0.1mm (but services should be added, local deformation of the support must be studied)  Next slide: Just to estimate the impact of the fixation of the modules on the spacer-frame without kinematic mounts (Warning! The same exercise must be done with thermal analysis before to conclude)

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 29 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Vertical sector without kinematic mounts between the modules and the spacer-frame (without sTGC weight) Sector (spacer- frame+modules) Spacer-frame only Modules only (Quadruplets) Maximum displacement ~0.01mm Stiffness of the modules and of the spacer-frame are compatible but the worst case will come from thermal analysis Maximum displacement ~0.03mm

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 30 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Next slides : We consider that the sTGC wedges have been fixed directly on the spacer frame without kinematic mounts (only kinematic mounts outside the spacer frame) Fixation of sTGC directly on the spacer-frame without kinematic mounts (4 supports)

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 31 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Vertical sector with sTGC weight Sector (spacer- frame+modules) Spacer-frame only Modules only (Quadruplets) Maximum displacement ~0.07mm Maximum displacement ~0.15mm

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 32 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Horizontal sector with sTGC weight Sector (spacer- frame+modules) Modules only (Quadruplets) Maximum displacement ~0.02mm Spacer-frame only Maximum displacement ~0.7mm

MECHANICAL ANALYSIS 2013/02/21-22 | PAGE 33 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Statement 2: With the weight of the sTGC wedges applied on the spacer- frame (4 supports), we have a strong impact on the deformation of the spacer but not on the displacement of the MM modules. The kinematic mounts are needed to fix the sTGC on the spacer-frame to maintain the relative position of the sTGC w.r.t. the MM modules.  Statement 3: If the stiffness of the quadruplets (MM modules and sTGC wedges) is confirmed with mock-up (*), we can use a spacer-frame to do the assembly of them (Young modulus at least MPa)  But, we cannot conclude before thermal analysis (next step, we just begin the work)! * Measurement of the stiffness of the composite panel is planned at Saclay

THERMAL ANALYSIS 2013/02/21-22 | PAGE 34 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  The goal is to have under control the deformation mode of the modules with the alignment systems To define the kinematic mounts of the modules (Z displacements?) In this case we need a more precise description of the geometry of the module  Loading conditions Self weight In all cases the tilt of the wheel at 0.7° is considered Temperature gradient ΔT=2°C Today, the location of the electronic power deposition is not defined  Boundary conditions Same boundary conditions as for mechanical analysis

 A first approach With 4 kinematic mounts on the spacer-frame The stiffness of each panel of the module has been considered THERMAL ANALYSIS 2013/02/21-22 | PAGE 35 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT MaterialAluminumFR4Rohacell G10 Density (Kg/m 3 ) Young modulus (MPa) Coefficient of thermal expansion2,31,53,51,5 Thermal conductivity1480,00250,030,0025 Very preliminary

 Behavior of the modules With 4 kinematic mounts on the module The stiffness of each panel of the module has been considered THERMAL ANALYSIS 2013/02/21-22 | PAGE 36 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT Very preliminary

 Behavior of the module M4 With 4 kinematic mounts on the module The stiffness of each panel of the module has been considered THERMAL ANALYSIS 2013/02/21-22 | PAGE 37 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT Y displacement to 0mm Z displacement to +0.02mm X displacement ~0mm Very preliminary

THERMAL ANALYSIS 2013/02/21-22 | PAGE 38 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Horizontal sector Sector (spacer- frame+modules) Modules only (Quadruplets) Maximum displacement ~0.1mm Spacer-frame only Maximum displacement ~0.1mm Very preliminary

Displacement of the modules can be reduced by changing of the location of the unidirectional sliding kinematic support THERMAL ANALYSIS 2013/02/21-22 | PAGE 39 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Sector at 45° Sector (spacer- frame +modules) Spacer-frame only Modules only (Quadruplets) Maximum displacement ~0.2mm Maximum displacement ~0.2mm Very preliminary

THERMAL ANALYSIS 2013/02/21-22 | PAGE 40 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Statement for the first approach with temperature gradient: Not critical with 4 kinematic mounts on the spacer-frame which are not at the optimized position (not at “Bessel point”), it should be possible to keep the displacement of the MM modules under 0.1mm (but services should be added, local deformation of the support must be studied)  Next slide: Just to estimate the impact of the fixation of the modules on the spacer-frame without kinematic mounts Very preliminary

THERMAL ANALYSIS 2013/02/21-22 | PAGE 41 CERN MMM workshop - CEA-Saclay/DSM/Irfu - Patrick PONSOT  Vertical sector 05 without kinematic mounts on the modules Sector (spacer- frame+modules) Spacer-frame only Modules only (Quadruplets) Maximum displacement ~0.18mm Maximum displacement ~0.55mm Deformation mode is not under control, kinematic mount are needed Very preliminary

DSM Irfu SIS/LCAP (PC N°12, Bt 123) Patrick PONSOT Commissariat à l’énergie atomique et aux énergies alternatives Centre de Saclay | Gif-sur-Yvette Cedex T. +33 (0) | F. +33 (0) Etablissement public à caractère industriel et commercial | RCS Paris B /02/21-22 Thank you for your attention ! CERN MMM workshop - CEA- Saclay/DSM/Irfu - Patrick PONSOT | PAGE 42