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SVD Mechanics

SVD Mechanics. IDM. Current Ladder 6 Design. Sensor. Origami Modules. Mount Structure. Wedge Sensor. Hybrid Board. CF Ribs. Sensor without Origami. Origami Modules. Immanuel Gfall (HEPHY Vienna). The ladder is 645 mm long with a distance between the ribs of 16.5 mm

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SVD Mechanics

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  1. SVD Mechanics Immanuel Gfall (HEPHY Vienna) IDM

  2. Current Ladder 6 Design Sensor Origami Modules Mount Structure Wedge Sensor Hybrid Board CF Ribs Sensor without Origami Origami Modules Immanuel Gfall (HEPHY Vienna) Immanuel Gfall (HEPHY Vienna) The ladder is 645 mm long with a distance between the ribs of 16.5 mm Ribs are attached to end ring mounts End ring mounts also connect hybrid boards to cooling channels integrated in the end rings APV25 aligned in one line Slanted / wedge sensor in the forward region to minimize sensor count and material budget 2

  3. End Ring Ladder Link Hybrid Board Cooling Ribs Ladder Fixture Cable Connectors Precision Pins Mountblock Immanuel Gfall (HEPHY Vienna) Immanuel Gfall (HEPHY Vienna) 15 mm wide mount block supports CF ribs Alignment purpose and CTE compensation Mount point for hybrid boards Thermal control through conduction and cooling ribs Design will be overhauled! 3

  4. End Ring Design • Fix the ladders to the support structure • Offer space for cable and cooling tubes routing • Need to be cooled • Two available design scenarios: • Open end ring • Closed end ring Immanuel Gfall (HEPHY Vienna)

  5. Open End Ring • Interesting choice from service routing point of view • Cables and tubes can be installed “from top” • Overly complex shape • Can easily get damaged during machining • Heat sink too far away from source Cooling grooves Ladder Fixture Immanuel Gfall (HEPHY Vienna)

  6. Static Simulation Setup: Ladder equivalent mass has been applied to each mount point and gravitational sag has been simulated Maximum deformation under full load: 5 µm Immanuel Gfall (HEPHY Vienna)

  7. Closed End Ring • Similar to SVD 2 design but bigger • Cooling channel is implemented into the ring • Thermocompression bonding is used • End ring consists of four parts, two are bonded together Cooling inlet Cooling Channel Split Line Cooling outlet (not visible in picture) Immanuel Gfall (HEPHY Vienna)

  8. Static Pressure Simulation • 100 bar pressure • 60 g weight per fixture • Maximum deformation: 0.014 mm Immanuel Gfall (HEPHY Vienna)

  9. Forward Region “Old Solution” Beam Mask End Rings Immanuel Gfall (HEPHY Vienna)

  10. Service Ways • CAD study to show if service space is available • Almost straight cable paths are possible • Study shows that there is still space left Ribbon Cables Immanuel Gfall (HEPHY Vienna)

  11. Current Status • Added components that fix certain parameters • Interesting concept for end ring cooling • Estimation of beam mask shape / size • Updated isolation/support shell Hybrid Board Beam Mask Support Cone Immanuel Gfall (HEPHY Vienna)

  12. Support Assembly • Built around beam pipe • SVD support structure is split into halves • Beam mask needs to be split as well End Rings Patch Panel Space Support Cone Beam Mask Immanuel Gfall (HEPHY Vienna)

  13. Space Requirement SVD Immanuel Gfall (HEPHY Vienna)

  14. Barrel Support • SVD 2 had a carbon fiber shell to combine forward and backward support • Belle 2 SVD needs thermal insulation (Airex cover) • Carbon fiber-Airex sandwich • Adds stiffness that could be of use during installation • Does not add more material as is present in SVD 2 Carbon Fiber Sandwich Carbon Fiber Layer Airex Core Immanuel Gfall (HEPHY Vienna)

  15. Installation Support Proposal • SVD will be very heavy • Suitable support for installation required • “Sled” from SVD 2 not sufficient • Oil drill style sliding tube for installation support Flange Oil Drill Style Tube SVD Slide Support Immanuel Gfall (HEPHY Vienna)

  16. CO2 Cooling Status • Sophisticated open CO2 system under development • Goal is to learn a lot about controlling / running a cooling plant • Components are selected and bought • Current work: plant layout • Goal is to have a compact and transportable system • Annekathrin Frankenberger and I are working on this system CAD Model of Mass flow control valve Immanuel Gfall (HEPHY Vienna)

  17. Cooling: CO2 Blow System T= -20°CP=20bar T= -20°CP=20bar T> -20°CP=57bar T= 23°CP=57bar T= -20°CP=20bar Immanuel Gfall (HEPHY Vienna)

  18. Components already in Vienna Pressure Sensor Massflowmeter + Control Pressure Regulator Backpressure Regulator 50µm Wallthickness Coolingtube!!! Immanuel Gfall (HEPHY Vienna)

  19. Outlook • Complete overhaul of the ladder mount support • Refinement of end ring structure • Finding better manufacturing solution for ribs • Tweaking and tuning of CFRP support • Build and run the CO2 cooling system Immanuel Gfall (HEPHY Vienna)

  20. Backup Immanuel Gfall (HEPHY Vienna)

  21. Mechanical Feasibility of Slanted Design Knee is reinforced by Crossply Conclusion: Plausible but… Immanuel Gfall (HEPHY Vienna)

  22. … there are challenges • Production of ribs is difficult because of small applicable forces for clamping • Rib vibrates during routing • Water cutting could also lead to mechanical degradation • Better rib end ring link solution • Twist of sensor plane due to mechanical imperfection • There are even more! • Same problems for both options except for angle precision! Immanuel Gfall (HEPHY Vienna)

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