Susanne Kyre UCSB 1

Thermal Analysis of Outer Tracker Modules and Rod

Susanne KyreUCSB

2/8/2010

Susanne Kyre UCSB 2

TK Module design parametersfrom Nov 2009 TUPO presentation by Hans Postema

• 2.5 cm strip length• Sensor glued on 2 TPG strips• TPG strips on the backplane

side• TPG strips connected to

cooling block on cooling pipe• Hybrid with apv’s glued on

sensor, strip side, above the TPG strip

• DC-DC converter glued on the TPG strip of the sensor.

• One DC-DC converter powers 2 hybrids

2/8/2010

Susanne Kyre UCSB 3

Dimensions and MaterialsPart Material Area [mm2] Thickness [mm]

thermal conductivity [W/mK] Power [mW]

Sensor Silicon 84.5 x 100.3 0.2 148 310

Chip Silicon 10 x 12 0.2 148 125

DC-DC coil Silicon 12 x 12 9 148 225

Hybrid G10 and copper85 x 14

107 x 30 (ears) 0.830.8 in plane;

0.37 out of plane

Support strip TPG 116 x 14 11500 in plane; 20 out of plane

Epoxythermally conductive

epoxy all glue joints .05 1.5

Cooling Block Beryllium Oxide13.5 x 14

1.7mm cooling tube dia. 4 248

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Susanne Kyre UCSB 4

Module FEA

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Susanne Kyre UCSB 5

Result of steady state thermal analysisMaximum Temperature: -27.0°C (at center readout chips on hybrid #2)

2/8/2010

Susanne Kyre UCSB 6

Result of steady state thermal analysisMaximum Sensor temperature: -28.3°C

2/8/2010

Susanne Kyre UCSB 7

TK Rod design parameters• 12 Modules per rod (6 facing up, 6 facing down)• One cooling loop per rod• Cooling block temperature at inlet: -30°C• Cooling block temperature at outlet: -25°C• Sensor, DC-DC and Readout chip power as in Module analysis

2/8/2010

8

Cooling block temperatures• From Module analysis: Heat flux through cooling block-pipe

interface differs with cooling block location• • Assume: ΔT between cooling blocks is proportional to

difference in heat flux between cooling blocks

2/8/2010 Susanne Kyre UCSB

mmmW 9.9

231 mmmW9.12

22 mmmW

24 1.11

Susanne Kyre UCSB 9

Rod FEA

2/8/2010

Susanne Kyre UCSB 10

Result of steady state thermal analysisMaximum Temperature: -24.0°C at hybrid #2 on module closet to inlet/outlet

2/8/2010

Max. Temp

Susanne Kyre UCSB 11

Result of steady state thermal analysisMaximum Sensor temperature:-25.1°C at sensor closest to inlet/outletThis sensor also has the largest temperature gradient: 3.0°C across the sensor

2/8/2010