Integrated Stave Electrical/Mechanics/Cooling Update

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Integrated StaveElectrical/Mechanics/Cooling
Update

• February 6, 2008

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Prototypes and Designs
60 cm, 9 cm strip, 6 segments/side
Stave-06
1 meter, 3 cm strip, 30 segments/side 192 Watts
(ABCD chip), 2.4 Xo support structure
6 x 3 cm, 6 chips wide
Stave-07
Build and test
Study
1 meter, 2.5 cm strip, 40 segments/side 200-250
Watts (_at_0.25 W/chip) 1.9 2.2 Xo support
10 x 10 cm, 10 chips wide
Stave-08
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Issues From Valencia

• Progress on testing and fabrication of Stave-07
• Irradiation of hybrids glued directly on silicon
  surface
• Thermal performance of bridged hybrid
• Planning for Spring 2008 module review

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Progress on Testing/Fab of Stave-07

• Have operated 5 hybrids in a serial chain with
  good performance
• Have built and are studying 3 modules with hybrid
  on the silicon and 1 reference module with
  hybrid off the silicon
• Effort on gluing and alignment procedures
  implicit in module building
• Bus cable has been submitted for fabrication, due
  in 1-2 weeks
• Extra clock lines have been added to allow
  options for clock distribution included 1 clock
  for 30 module or 1 clock for 10 modules

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Module Assembly and Test Fixture
Evolve a single fixture for assembly, bonding,
inspection, and test.
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Bus Cable
Data Readout 1/hybrid
Serial current return
Clock Command lines
Serial current link
HV distribution
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Irradiation plans

• Irradiations are in planning phase both at BNL
  and LBNL
• BNL is looking at Boston and Los Alamos sites
• LBNL would use on-site 55 MeV protons
• Hope to have first runs in the next few months

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FEA Models of Bridged Hybrid - I

• Since the Valencia meeting we have completed FEA
  analysis of basic thermal performance with
  bridged hybrid
• Multiple models to achieve reliability and
  understanding
• ¼ simple model, similar to ANSYS model by others,
  air treated as solid under bridge
• ½ model with air box to allow for 3D air effects
  (not just under bridge), no air flow

Air box for 1/2
¼ model
½ model
Air gap
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FEA Models of Bridged Hybrid -II

• Multi-hybrid model, with air flow included(so far
  0.01 m/sec)
• For simplicity, all studies so far done with tube
  wall temperature fixed at -28C, 0.25 W/IC and no
  detector heating.
• Goal is to compare first with glued hybrid under
  same conditions
• More details are here and here

Multi-hybrid model
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Short Summary

• Good agreement among models
• Modest effect of gas flow
• Reduced K means lower than nominal K in
  structure. No optimization of structure yet
• For comparison, nominal design (hybrids glued on
  silicon) for comparable assumptions yields max
  sensor temperature of about -22.5C

Model IC Peak Temp(C) Bridge Gradient(C) Sensor T Max(C)
¼ model -5.8 6.6 -20
½ model -6.3 6.8 -20.2
With air flow -15C gas -5.9 7.6 -18.7
¼ model Reduced K 3.4 5 -16.7