Collimator Test-Bench Heating Test

01.07.2004 Collimator rev01.07.2004 Collimator revueue

A. Bertarelli - S. Calatroni - M. Mayer - R. PA. Bertarelli - S. Calatroni - M. Mayer - R. Perret TS/MMEerret TS/MME

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Collimator Test-Bench Collimator Test-Bench Heating TestHeating Test

Primary GoalsPrimary Goals– To measure the thermal impedance between To measure the thermal impedance between

graphite and the cooling plate as a function of graphite and the cooling plate as a function of the applied pressurethe applied pressure

– To verify the temperature distribution in the To verify the temperature distribution in the collimator jaw baseline design (graphite, copper collimator jaw baseline design (graphite, copper cooling plate, s.steel support structure) and cooling plate, s.steel support structure) and compare to simulationscompare to simulations

– To identify whether graphite dust is produced To identify whether graphite dust is produced after several bakeout cycles at 250 ºCafter several bakeout cycles at 250 ºC

Secondary GoalSecondary Goal– To measure outgassing of graphite in the real To measure outgassing of graphite in the real

configurationconfiguration



22

Experimental set-upExperimental set-up



33

Heating resistanc

e

Cooling channels

Springs

AC150 C-C

composite

Experimental set-upExperimental set-up



44

2 x 5 lt/min, 6 Kg/m2 x 5 lt/min, 6 Kg/m22 spring spring loadload

Measured temperature Measured temperature increaseincrease84±1 ºC

~13 ºC

2.9±0.3 ºC

5.3±0.3 ºC

6.7±0.3 ºC

10.1±0.3 ºC 200±0.4 ºC

~51 ºC

9.7±0.3 ºC

16.9±0.3 ºC

21.4±0.3 ºC

30.4±0.4 ºC

1500 W 4000 W



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Estimation of thermal Estimation of thermal impedanceimpedance

2

3

4

5

6

7

8

9

1000 1500 2000 2500 3000 3500 4000 4500 5000

T

Gra

ph

ite

- C

op

per

[K

]

Applied Power [W]

Global thermal Global thermal impedance impedance Cu/AC150 C-CCu/AC150 C-C~ 8800 W m~ 8800 W m-2-2KK-1-1



66

Thermal impedanceCu / Carbon-Carbon

Spring loadSpring load

2.4 Kg/cm2.4 Kg/cm22

Spring loadSpring load

6 Kg/cm6 Kg/cm22

Experiment Experiment (approximate (approximate global value)global value)

~ 5400 W m~ 5400 W m-2-2KK--

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~ 8800 W m~ 8800 W m-2-2KK--

11

Estimation of thermal Estimation of thermal impedanceimpedance



77

Temperature distribution Temperature distribution Comparison experiment - Comparison experiment -

modelmodel

31.1º

24.9º

21.9º

17.8º

30.8º

24.0º

21.3º

17.4º

Absolute temperatures with water inlet at 11 ºC, 2x5 lt/min, 2500W* E. Marotta, S. Mazzuca, J. Norley, Electronics Cooling August 2002* E. Marotta, S. Mazzuca, J. Norley, Electronics Cooling August 2002

Experiment Model *



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2000 W , 6 Kg/m2000 W , 6 Kg/m22 spring load spring load Change of water flowChange of water flow

109±2 ºC

~26 ºC

9±1.1 ºC

12.6±1.1 ºC

14.8±1.1 ºC

19.6±1.1 ºC104±2 ºC

~20 ºC

4.7±1.1 ºC

8.3±1.1 ºC

10.6±1.1 ºC

15.3±1.1 ºC

2 x 3 lt/min, Twater=5.6±0.4 ºC

2 x 5 lt/min, Twater=2.6±0.4 ºC



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Switch-on 0 -> 2500 WSwitch-on 0 -> 2500 W

Documents

Collimator Test-Bench Heating Test