18 November 2010 Immanuel Gfall (HEPHY Vienna) SVD Mechanics IDM

SVD Mechanics 2Immanuel Gfall (HEPHY Vienna)4 November 2010 Current Ladder 6 Design 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 2Immanuel Gfall (HEPHY Vienna) Sensor CF Ribs Mount Structure Hybrid Board Origami Modules Origami Modules Sensor without Origami Wedge Sensor

SVD Mechanics 3Immanuel Gfall (HEPHY Vienna)10 September 2010 End Ring Ladder Link 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! 3Immanuel Gfall (HEPHY Vienna) Cable ConnectorsPrecision Pins Ladder Fixture Mountblock Hybrid BoardCooling Ribs

SVD Mechanics 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 4Immanuel Gfall (HEPHY Vienna)18 November 2010

SVD Mechanics 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 5Immanuel Gfall (HEPHY Vienna)18 November 2010 Cooling grooves Ladder Fixture

SVD Mechanics Static Simulation 6Immanuel Gfall (HEPHY Vienna)18 November 2010 Maximum deformation under full load: 5 µm Setup: Ladder equivalent mass has been applied to each mount point and gravitational sag has been simulated

SVD Mechanics 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 7Immanuel Gfall (HEPHY Vienna)18 November 2010 Cooling inlet Split Line Cooling outlet (not visible in picture) Cooling Channel

SVD Mechanics Static Pressure Simulation 100 bar pressure 60 g weight per fixture Maximum deformation: mm 8Immanuel Gfall (HEPHY Vienna)18 November 2010

SVD Mechanics Forward Region “Old Solution” 9Immanuel Gfall (HEPHY Vienna)18 November 2010 Beam Mask End Rings

SVD Mechanics Service Ways 10Immanuel Gfall (HEPHY Vienna)18 November 2010 Ribbon Cables CAD study to show if service space is available Almost straight cable paths are possible Study shows that there is still space left

SVD Mechanics Current Status Added components that fix certain parameters Interesting concept for end ring cooling Estimation of beam mask shape / size Updated isolation/support shell 11Immanuel Gfall (HEPHY Vienna)18 November 2010 Beam Mask Support Cone Hybrid Board

SVD Mechanics Support Assembly Built around beam pipe SVD support structure is split into halves Beam mask needs to be split as well 12Immanuel Gfall (HEPHY Vienna)18 November 2010 Beam Mask End Rings Support Cone Patch Panel Space

SVD Mechanics Space Requirement SVD 13Immanuel Gfall (HEPHY Vienna)18 November 2010

SVD Mechanics Barrel Support 14Immanuel Gfall (HEPHY Vienna)18 November 2010 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 SandwichCarbon Fiber Layer Airex Core

SVD Mechanics 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 15Immanuel Gfall (HEPHY Vienna)18 November 2010 Oil Drill Style Tube Slide Support Flange SVD

SVD Mechanics CO 2 Cooling Status Sophisticated open CO 2 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 16Immanuel Gfall (HEPHY Vienna)18 November 2010 CAD Model of Mass flow control valve

SVD Mechanics Cooling: CO 2 Blow System 17Immanuel Gfall (HEPHY Vienna)10 September 2010 T= 23°C P=57bar T> -20°C P=57bar T= -20°C P=20bar

SVD Mechanics Components already in Vienna 18Immanuel Gfall (HEPHY Vienna)18 November 2010 Massflowmeter + Control Pressure Regulator Backpressure Regulator Pressure Sensor 50µm Wallthickness Coolingtube!!!

SVD Mechanics 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 CO 2 cooling system 19Immanuel Gfall (HEPHY Vienna)18 November 2010

SVD Mechanics Backup 20Immanuel Gfall (HEPHY Vienna)18 November 2010

SVD Mechanics Mechanical Feasibility of Slanted Design 21Immanuel Gfall (HEPHY Vienna)18 November 2010 Angle is determined by 2D cutout precisionManageable Stiffness of rib around the angled sectionSufficient Slanted ribs are shorter and have to support less weightIdeal End ring design and space allocationNo concern Beam mask thickness and space with slanted optionSufficient Knee is reinforced by Crossply Conclusion: Plausible but…

SVD Mechanics … there are challenges 22Immanuel Gfall (HEPHY Vienna)18 November 2010 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!