1. Summary LBNL LSWG meeting

2. Richard Nickerson LSWG content
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
Cost estimation (Richard Nickerson + Andrea Catinaccio)
Atlas Web>Atlas>Upgrade>UpgradeITKLocalSupports
Preliminar agenda: Upgrade week

3. Tuesday – pm LSWG
Weds IWG, Strips
Thurs all day – Cooling
Assembly: mon/fri

4. Neal David Hartman
Pixel upgrade layout proposal: Phase 2 pixel layout “NEWPIX”
All proposed layouts include a staging option to arrive at the best of both worlds
Assume the utopia medium barrel layout, as it’s the most balanced and buildable option available
Including more disks: infinite variations
Look at services routing and implications in different layouts, material comparison…

5. Nigel Hessey
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!
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?
Compares Utopia, NewPix and layout with variable pixel barrel lengths
NewPix: more services in barrel-endcap gap

6. George Viehhauser Cooling; not formal decision about coolant
Issue 1: scale the CO2 cooling system to 200kW?
Issue 2: location?
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
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
New optical fibres
Still need to look into DCS and all pixel services
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

7. W. Miller, R. Bates
Allcomp: Berkeley spin off (Wei Shih and Bill Miller)
Thermal and mechanical test for carbon foam…
Carbon foam strength and thermal properties increase with density (0.22g/cc)
Foam conductivity is weak function of cell size
130ppi foam processing at 0.2g/cc and above produces higher conductivity than 100ppi foam
Current foam core material for LBNL stave prototypes with embedded cable.
The thermal and mechanical performance is highly determined by components interfaces and assembly/manufacturing processes.

8. W. Miller, R. Bates Laminate thermal conductivity
In-plane; micromechanics code “Helius – composites pro”
Transverse; best to measure it!
Recommend new FEA model of co-cured laminate with embedded cable suggested to compare with test results.
Laser diffusivity measurements and comparisons with micromechanics…
Tensile test results influenced by thickness measurement…
Results of predicted and measured conductivities…
Fibre mechanical properties
Sandwich 50x50mm tensile test: face sheet fails – irradiated samples?
K13D2U (0-90-0) + UCF-126-3/ Hysol9396

9. Marco Oriunno

10. Tim Jones Stave thermal cycling Mass reduction program
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
Radiation length
2.65% stave
2.37% supermodule
(no bus cable but insertion mechanism included)

11. William Emmet
Experimental set-up

12. Franziska Hegner

13. Nigel Hessey

14. Eric Anderssen