Dogleg Thermal Tests : Configuration

7

6

AiN plate side

Jan 4 2002. SM+LB

8

Dogleg side

Heater (0.4W)

2 1

34

5

6 7

8

flow2

Temperature sensors located at positions 1-8.

Cooling Block

Alumina dummy module

Clip

Coolant pipeCeramic heater

Cooling block, Dogleg, and dummy module assembly

Orientation of dT1, dT2 and dT3 on the Dogleg

dT1

dT2

(Cooling block)

dT3

Upper face

Lower face

Test setup, left and right: resevoir (-14° nominally), test chamber (-7° nominally)

dT1 0.4dT2 3.3dT3 6.7

Summary of Dogleg dTs and considerations in future tests

•Convection contributes to these measurements.

•How will convection affect cooling in the operational barrel environment?

•Repeating these tests on the sector prototype will provide better understanding of this behaviour.

•Tests will be repeated using a block with a shunt shield.

-1

1

3

5

7

9

11

13

-20 -15 -10 -5 0

Environment temp

dT

dT1-Through dogleg

dT2-along heat spreader

dT3-AlN to cooling block

dT0-Module heater andcoolant fluid

dTs vs environment temperature

Time dependence of Freezer environment temperature vs dTs

-1012345678

0 50 100 150

time/min

Tem

per

atu

re

dT1

dT2

dT3

dT0

Chamber temp(offset + 9degrees)