Download Slides - Indico

Summary LBNL LSWG meeting
Richard Nickerson
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LSWG content
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All mechanical components
Cooling/connectors
Power tapes
Locking components for GS
Shipping containers
Text fixtures/boxes/equipment/DAQ/cooling plants
Survey equipment
Insertion tooling/Assembly equipment
Assembly of LS, including attaching modules
Quality control of components and materials
Test of assembled local supports
Survey of LS
Shipping of LS
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Cost estimation (Richard Nickerson + Andrea Catinaccio)
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Atlas Web>Atlas>Upgrade>UpgradeITKLocalSupports
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Preliminar agenda: Upgrade week
Tuesday – pm LSWG
Weds IWG, Strips
Thurs all day – Cooling
Assembly: mon/fri
Neal David Hartman
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Pixel upgrade layout proposal: Phase 2 pixel layout “NEWPIX” - 2018
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All proposed layouts include a staging option to arrive at the best of both
worlds
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Assume the utopia medium barrel layout, as it’s the most balanced and
buildable option available
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Including more disks: infinite variations
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Look at services routing and implications in different layouts, material
comparison…
Nigel Hessey
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Compares Short-barrel, Utopia and Long-barrel options (services not included)
– Short barrel: lower cost/work/best pattern recognition
– Utopia: is not so different
– Long barrel: is worse!
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Compares Short-barrel, Utopia and Long-barrel options (services included)
– Long-barrel small improvement in the barrel-only region
– Long- barrel + pixel produces a wall of services in front of the end-cap strips
– Pixel services routing: what if we go directly forwards, not through the strip
barrel/end-cap gap?
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Compares Utopia, NewPix and layout with variable pixel barrel lengths
– NewPix: more services in barrel-endcap gap
George Viehhauser
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Cooling; not formal decision about coolant
– Issue 1: scale the CO2 cooling system to 200kW?
– Issue 2: location?
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Re-usability of type II/III (SCT) or type III/IV (TRT) outside services
– Current SCT services (calorimeter endplate or PP2) need to be cut and re-connected
– Current TRT cables > connect to distribution at PP2
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Strip services
– Current SCT or TRT cables> enough Cu for serial and DC/DC (grounding? aging?)
– Not enough HV lines to connect every individual sensor (TRT+SCT 5k for 17k
sensors) need to consider some kind of multiplexing
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New optical fibres
Still need to look into DCS and all pixel services
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Positioning requirements
– Placement accuracy not important, present system very stable <10um globally with
no external perturbation
– Track-based alignment can do everything but “weak modes” are hard to compensate
by software
W. Miller, R. Bates
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Allcomp: Berkeley spin off (Wei Shih and Bill Miller)
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Thermal and mechanical test for carbon foam…
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Carbon foam strength and thermal properties increase with density (0.22g/cc)
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Foam conductivity is weak function of cell size
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130ppi foam processing at 0.2g/cc and above produces higher conductivity
than 100ppi foam
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Current foam core material for LBNL stave prototypes with embedded cable.
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The thermal and mechanical performance is highly determined by components
interfaces and assembly/manufacturing processes.
W. Miller, R. Bates
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Laminate thermal conductivity
– In-plane; micromechanics code “Helius – composites pro”
– Transverse; best to measure it!
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Recommend new FEA model of co-cured laminate with embedded cable
suggested to compare with test results.
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Laser diffusivity measurements and comparisons with micromechanics…
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Tensile test results influenced by thickness measurement…
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Results of predicted and measured conductivities…
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Fibre mechanical properties
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Sandwich 50x50mm tensile test: face sheet fails – irradiated samples?
– K13D2U (0-90-0) + UCF-126-3/8-2.0 + Hysol9396
Marco Oriunno
Tim Jones
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Stave thermal cycling
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2m long chamber, Liquid N2 cooling – 50ºC, electrical heater +50ºC; 1 hour cycle time
Overall plan: 50 cycles (visually inspect every 10 cycles)
No sign of delamination after 10 cycles
C channel – face sheet delamination in evidence after 20 cycles
Mass reduction program
– Co-cured face sheets sucked onto vacuum jig, although residual curvature difficult
to control along the edge
– Nearly glueless stavelet (pre-preg to attach face sheet to core components)
– Glue film investigations (CNC cuter)
– No core stave; CFRP tubes running the full length
– Corrugated cores
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Radiation length
– 2.65% stave
– 2.37% supermodule
(no bus cable but insertion mechanism included)
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William Emmet
Experimental set-up
Franziska Hegner
Nigel Hessey
Eric Anderssen