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


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


Cooling grooves

Ladder Fixture

SVD Mechanics

Static Simulation


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


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


SVD Mechanics

Forward Region “Old Solution”


Beam Mask

End Rings

SVD Mechanics

Service Ways


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


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


Beam Mask

End Rings

Support Cone

Patch Panel Space

SVD Mechanics

Space Requirement SVD


SVD Mechanics

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 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


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


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


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


SVD Mechanics

Backup


SVD Mechanics

Mechanical Feasibility of Slanted Design


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


• 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!

18 november 2010 immanuel gfall (hephy vienna) svd mechanics idm

Documents

immanuel gfall hephy

immanuel gfall hephy

immanuel gfall hephy

open end ringclosed

ring mounts end ring

end ring ladder link15

end ringsapv25

usedend ring