Mechanical Program

1
Mechanical Program

• Eric Anderssen, LBNL engineer working on ATLAS
  pixels is phasing into our pixel program full
  time in January 2008 (carbon composite expert)
• Contracted ARES company for analysis on cooling,
  precision mount design and refinement of ladder
  stability.
• Phone meetings weekly
• First results
• we will need a sub ambient cooling system
• simplified precision mount
• First stage report due in January
• Addressing two items
• Cylinder modifications for integration of GEMS,
  IST and Pixels
• Pixel mechanical design

2
Cut Apart Current Cones August 2009
Send to Berkeley
Keep at Brookhaven

• Old East Cone and most of Beams to be reused to
  support New West Cone
• Old West cone refurbished into New East Cone in
  Berkeley
• Cut Carbon Elliptical Beams avoiding Al Insert

Eric Anderssen
2
3
Modified East Cone and Install with New West
Cylinder
1.5m
Some Tooling Required

• View as Temporary FixShould be ACAP (as cheap as
  possible)
• Supports end of New West Cone/FGT
• Replicates Old Beam Pipe Interfaces
• Includes SSD if required
• Only for summer 09 to 10
• Wholly Machined/Bonded Solution
• Tooling to locate Buck Plate while bonding is
  required

Buck Plate aimed for Easy Swap of replacement
Eric Anderssen
4
GoalSwap-in Replacement and Install pixels
summer 2010
New East Cone with Cylindrical Shell made from
Old West Cone Swap in by matching Bolted
Interface to New West Cone
Include SSD interface On Shell
Modification Will Take Up Length
Should Be Same Length
Eric Anderssen
5
Inner Support Cylinder (ISC)
ISC fits inside and is supported by the cone
ISC supports IST on outside
ISC supports pixel and beam pipe inside
ISC
6
Pixel support structure current development
End view
8 cm radius
2.5 cm radius
Inner layer Outer layer
ALICE style carbon support beams (green)
7
Sector/ladder design
carbon composite support beam
thinned MAPS chips 2 cm by 2 cm, 50 µm thick
multilayer aluminum kapton flex circuit cable for
signal and power
thin carbon composite substrate
8
Conceptual mechanical design
9
Pixel placement concept

• Detector assembly slides in on rails
• Parallelogram hinges support the two detector
  halves while sliding
• Cam and follower controls the opening of the
  hinges during insertion and extraction
• Detector support transfers to kinematic dock when
  positioned at the operating location

pixel support hinges
kinematic dock
sliding carriage
cam followers and linear cam
slide rails
10
Cam guided insertion operation
Closed
Open
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Hinge analysis
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Two sector patch installation summer 2010
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cable bundle
connection type number of pairs allocated pair diameter
Analog power 1 6mm
Digital power 1 6mm
signal 40 .64mm
sync 1 .64mm
clk 1 .64mm
marker 1 .64mm
Jtage (5 conductors) 3 .64mm