VG VG 1 W.O. Miller i T i i T i Bridge Thermal Model Bridge Thermal Model • Salient Features Salient Features – High conductivity (700W/mK, 0.5mm thick) CC bridge material High conductivity (700W/mK, 0.5mm thick) CC bridge material support for 0.28mm thick hybrid(1W/mK) support for 0.28mm thick hybrid(1W/mK) – 40 chips @ 0.25W/chip 40 chips @ 0.25W/chip – Detector 0.28mm thick, 148W/mK Detector 0.28mm thick, 148W/mK – Allcomp carbon foam for bridge support (isotropic 45W/mK) Allcomp carbon foam for bridge support (isotropic 45W/mK) – Carbon Foam for tube support (45/45/45 W/mK) Carbon Foam for tube support (45/45/45 W/mK) • Reduced density over POCO foam (0.2g/cc versus 0.5 g/cc) Reduced density over POCO foam (0.2g/cc versus 0.5 g/cc) – Sandwich foam Sandwich foam • Allcomp foam option, ~0.1g/cc @ 3W/mK Allcomp foam option, ~0.1g/cc @ 3W/mK • Comparison with Hybrid on 10cm Detector Comparison with Hybrid on 10cm Detector – Thermal solution with both with inner tube wall at -28 Thermal solution with both with inner tube wall at -28 ºC ºC • Simulates -30 Simulates -30 ºC with 8000W/m ºC with 8000W/m 2 K • No change made to material properties in 10cm detector No change made to material properties in 10cm detector with integrated hybrid with integrated hybrid
Bridge Thermal Model. Salient Features High conductivity (700W/mK, 0.5mm thick) CC bridge material support for 0.28mm thick hybrid(1W/mK) 40 chips @ 0.25W/chip Detector 0.28mm thick, 148W/mK Allcomp carbon foam for bridge support (isotropic 45W/mK) - PowerPoint PPT Presentation
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VG VG 11W.O. Miller
i T ii T i
Bridge Thermal ModelBridge Thermal Model
• Salient FeaturesSalient Features– High conductivity (700W/mK, 0.5mm thick) CC bridge material support High conductivity (700W/mK, 0.5mm thick) CC bridge material support
for 0.28mm thick hybrid(1W/mK)for 0.28mm thick hybrid(1W/mK)– 40 chips @ 0.25W/chip40 chips @ 0.25W/chip– Detector 0.28mm thick, 148W/mKDetector 0.28mm thick, 148W/mK– Allcomp carbon foam for bridge support (isotropic 45W/mK)Allcomp carbon foam for bridge support (isotropic 45W/mK)– Carbon Foam for tube support (45/45/45 W/mK)Carbon Foam for tube support (45/45/45 W/mK)
• Reduced density over POCO foam (0.2g/cc versus 0.5 g/cc)Reduced density over POCO foam (0.2g/cc versus 0.5 g/cc)– Sandwich foamSandwich foam
• Comparison with Hybrid on 10cm DetectorComparison with Hybrid on 10cm Detector– Thermal solution with both with inner tube wall at -28Thermal solution with both with inner tube wall at -28ºCºC
• Simulates -30Simulates -30ºC with 8000W/mºC with 8000W/m22KK
• No change made to material properties in 10cm detector No change made to material properties in 10cm detector with integrated hybrid with integrated hybrid
VG VG 22W.O. Miller
i T ii T i
10cm Detector-No Bridge10cm Detector-No Bridge
Old model parameters
VG VG 33W.O. Miller
i T ii T i
10cm Detector-No Bridge10cm Detector-No Bridge
• Material PropertiesMaterial Properties– See previous slide (#2)See previous slide (#2)
• 40 chips per detector, 80 40 chips per detector, 80 totaltotal– 0.25W/chip Q (Si)=0W0.25W/chip Q (Si)=0W– Tube inner surface -28Tube inner surface -28ºC, no ºC, no
convection coefficientconvection coefficient
• Interest in Interest in ΔΔT from chip T from chip and detector surface to and detector surface to tube surfacetube surface
core with Allcomp carbon core with Allcomp carbon foam (<0.2g/cmfoam (<0.2g/cm33: : 45W/mK)45W/mK)
– Also, replaced POCO Also, replaced POCO foam tube support with foam tube support with same foamsame foam
• Peak Chip Temp: -Peak Chip Temp: -22.722.7ºCºC
• Peak Detector: -24ºCPeak Detector: -24ºC– ΔΔT (referenced to tube T (referenced to tube
wall)wall)
• 4ºC4ºC
VG VG 55W.O. Miller
i T ii T i
10 CM Wide Stave-No Bridge10 CM Wide Stave-No Bridge
• Solution: Simulate “outer” Solution: Simulate “outer” long strip detectorlong strip detector– One upper and power hybrid for One upper and power hybrid for