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PIXEL Mechanical
H. Wiemanface to face Integration15-May-2008
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topics
Introduction – mechanical design Pixel specifications and parameters Review insertion mechanics
Kinematic mounts air flow analysis
cooling air requirements
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Pixel geometry
2.5 cm radius
8 cm radius
Inner layer
Outer layer
End view
One of two half cylinders
20 cm
coverage +-1
total 40 ladders
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Some pixel features and specifications
Pointing resolution (13 19GeV/pc) m
Layers Layer 1 at 2.5 cm radiusLayer 2 at 8 cm radius
Pixel size 18.4 m X 18.4 m
Hit resolution 10 m rms
Position stability 6 m (20 m envelope)
Radiation thickness per layer
X/X0 = 0.28%
Number of pixels 436 M
Integration time (affects pileup) 0.2 ms
Radiation tolerance 300 kRad
Rapid installation and replacement to cover rad damage and other detector failure
Installation and reproducible positioning in a shift
criticalanddifficult
(ATLAS Pixels 1.2%)
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New details on kinematic mounts
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Pixel kinematic mounts
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Pixel kinematic mounts
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Pixel kinematic mounts
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Pixel kinematic mounts
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Pixel kinematic mounts
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preliminary air flow study
ANSYS CFX FEE Flow analysis simplified geometry to limit
mesh input velocity 8 m/s down
module support tube ISC blank off to force return
flow over silicon surfaces Result:
good flow velocity over both inner and outer silicon
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Pixel air cooling system
Internal duct 2 in diameter X 5 ft
Internal duct 2 in diameter X 5 ft
external duct 6 in diameter X 50 ft
external duct 6 in diameter X 50 ft
chiller
pump
Wide angle hall ISC
Air flow: 400 SCFM
Total pressure drop: 22 inches water
Temperature: 75 deg F/34 deg C or maybe -10 deg C
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Pixel heat load break down
Heat source Power (watts)
detector silicon 160
on ladder signal drivers 80
voltage regulators in ISC 24
heat influx through ducting and ISC if 35 deg C below ambient
600 - 2000
pumping 1000
Total load on chiller 1900 - 3300