APV25 & Origami Status M.Friedl, C.Irmler, M.Pernicka HEPHY Vienna.
18 November 2010 Immanuel Gfall (HEPHY Vienna) SVD Mechanics IDM.
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Transcript of 18 November 2010 Immanuel Gfall (HEPHY Vienna) SVD Mechanics IDM.
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 Connectors Precision Pins
Ladder Fixture
Mountblock
Hybrid Board Cooling 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 inletSplit Line
Cooling outlet (not visible in picture)
Cooling Channel
SVD Mechanics
Static Pressure Simulation• 100 bar pressure
• 60 g weight per fixture
• Maximum deformation: 0.014 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 Sandwich Carbon Fiber LayerAirex 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
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
16Immanuel Gfall (HEPHY Vienna)18 November 2010
CAD Model of Mass flow control valve
SVD Mechanics
Cooling: CO2 Blow System
17Immanuel Gfall (HEPHY Vienna)10 September 2010
T= 23°CP=57bar
T> -20°CP=57bar
T= -20°CP=20bar
T= -20°CP=20bar
T= -20°CP=20bar
SVD Mechanics
Components already in Vienna
18Immanuel Gfall (HEPHY Vienna)18 November 2010
Massflowmeter + Control
Pressure RegulatorBackpressure 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 CO2 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 precision Manageable
Stiffness of rib around the angled section Sufficient
Slanted ribs are shorter and have to support less weight Ideal
End ring design and space allocation No concern
Beam mask thickness and space with slanted option Sufficient
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!