3/02/2004 ab,az,tsProto Front End Thermal Test Results 1EFNI HK

PACKAGED FRONT END COOLING TEST

The Front Ends of the Outer Tracker are closely packed, heat must be extracted with cooling wateralong the Aluminium cooling extension plate. For the test we use a cooling block with forced airSeveral sensors monitor heatup of components.

3/02/2004 ab,az,tsProto Front End Thermal Test Results 2EFNI HK

Good heat transport possible

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Frame sideview

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ASDBLR COOLING CONSTRUCTION

3/02/2004 ab,az,tsProto Front End Thermal Test Results 5EFNI HK

ASDBLR AS TEMPERATURE SENSOR

~750mV~1.8mV/C

We use a dummy inputdiode as temperature sensor(Not callibrated yet)

3/02/2004 ab,az,tsProto Front End Thermal Test Results 6EFNI HK

NTC 5K on Copper Surface Close to ASDBLR

Each oard has a sensorConnection point

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OTIS NTC

NTC UNDER OTIS ON OPOSITE SIDE

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NTC GRAPH

3/02/2004 ab,az,tsProto Front End Thermal Test Results 9EFNI HK Proto Outer Tracker Front-End Tests

9EFNI HK

35 C

Otis52 C

ASDBLR NTC on copper 42C

ASDBLRInput Diode43C

RESULTS AFTER SETTLING

3/02/2004 ab,az,tsProto Front End Thermal Test Results 10EFNI HK

25

50

30

35

40

45

12 Hours

COOLING BASE

6321

RED ASDBLR NTC ON Copper Board SURFACE 42C

BASEPLATE THERMOMETER 35C

t=0 >power on

REMARKS:1.forced air cooling base with regulators, shifts 10C2.ASDBLR steps up 5C in 2 minutes, then settles to 7C above plate3. OTIS settles 17C above cooling flap part of baseplate

OTIS Copper NTC 52C

BLUE ASDBLR DIODE ~43CASDBLR

17C

8C

FIRST IMPRESSION FROM PAPER RECORDERS AFTER POWER SWITCH ON

3/02/2004 ab,az,tsProto Front End Thermal Test Results 11EFNI HK

FIRST CONCLUSIONS

The ASDBLR has low temperature rise thanks to strong thermal coupling trough PCB Delta T=7 degrees C

The maximum delta T is 17 degrees C for the Otis chip

The regulators are mounted directly on the cooling plate , no internal sensor available, but adequate cooling is ok.