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8 th International Workshop on DEPFET Detectors and applications. Thermo-mechanical activities at Valencia. V. Castillo, C. Lacasta, A. Oyanguren, P. Ruiz. (IFIC - Valencia). 21/9/2011. Outline. M ock-up status at VLC. Studies of air flow cooling: - PowerPoint PPT Presentation
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Thermo-mechanical activities at Valencia
V. Castillo, C. Lacasta, A. Oyanguren, P. Ruiz
8th International Workshop on DEPFET Detectors and applications
(IFIC - Valencia)
21/9/2011
Arantza Oyanguren 2
Outline
8th International Workshop on DEPFET Detectors and Applications
Mock-up status at VLC
Studies of air flow cooling:- Effect of CO2 cooling + air flow at several temperatures on the ladders
Conclusions Plans at VLC
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Mock-up
COCO22 open open systemsystem NitrogenNitrogen
liquid Dewarliquid Dewar(cooled air)(cooled air)
Thermally Thermally isolated boxisolated boxwith dry atmospherewith dry atmosphere
chillerchiller
IR cameraIR camera
Mock-upMock-up
8th International Workshop on DEPFET Detectors and Applications
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Mock-up
Mock-up status:
- Mechanical dummy temporarily fixed in the CrCo sample: (plastic nut + screw ended with a wire embedded in the hole)- Thermal grease for the thermal contact- One resistor sample in the outer layer
- Set voltages: Sensor: 12 V P ~ 1W Switchers: 3V P ~ 0.25 W DCDs/DHPs: 20V P ~2.5 W
It works!(appart from the left switchers)
8th International Workshop on DEPFET Detectors and Applications
Mock-up
Calibration tool for the IR camera: ( depends on the material)
KaptonCu
Al
sensor
DCD/DHP DCD/
DHP
switcher
(broken) mechanical dummy
Tipp-ex
greaseTape 2
Tape 1
Marker
Al box filled with coolant: cooled down with chiller, heated with heaters. Study material
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~ 0.65
~ 0.35
~ 0.18
T= 90ºC
T= -10ºC
8th International Workshop on DEPFET Detectors and Applications
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Air flow studies
- Effect of blowing air at room temperature:
-The air flow (at room T) decreases and homogenizes the temperature along the detector. Decreases T ~ 15 C Max T along the ladder 18C 8C
Camera position
DCD/DHP
DCD/DHP
(corrected emmisivity)DCD/DHP
DCD/DHP
8th International Workshop on DEPFET Detectors and Applications
(vair (inlet) ~ 2m/s)
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Air flow studies
- Cooling down the end flanges with CO2
- Blowing air/N2 at different temperatures (cooled down with N2 liquid atmosphere)
Camera position
T (
ºC)
(corrected emmisivity)
25 ºC
- Bumps ?? (crab legs)- With CO2 + air flow T along the ladder ~ 20ºC (!?)
- Detector on: T ~ 45ºC- Effect of CO2 + air flow : T ~ 20ºC (or below)
Looking at the central region of the sensor:
Looking at the edges:
8th International Workshop on DEPFET Detectors and Applications
(vair (inlet) ~ 2m/s)
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Air flow studies
- Problems of IR transparence due to the thickness of the detector:
left switchers off
(corrected emmisivity)
sensor
switchers
- sensor- switchers
- Tipp-ex marks behind in the Cu inner ladder
Present setup
Previous setup
Tipp-ex marks behind
End flanges
Camera position
T(º
C)
Detector on, CO2 in the end flanges, no air flow
End flanges
Sensor and switchers: expected about same and behaviour
8th International Workshop on DEPFET Detectors and Applications
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Air flow studies
- sensor- switchers
(corrected emmisivity)
- Detector on, CO2 in the endflanges, cooled air flow
Effect of a polycarbonate sheet (IR opaque) behind the mechanical dummy (i.e. between the inner and outer ladders:
A few degrees (~3) difference, not observed for the switchers region, due to the reflexion in the inner ladder, seen by the IR camera through the thick sensor.
Effect of IR transparence due to the thickness of the sensor (?)
T~10ºC
8th International Workshop on DEPFET Detectors and Applications
Camera position
T(º
C)
Arantza Oyanguren 108th International Workshop on DEPFET Detectors and Applications
- More realistic conditions for the detector, set voltages so: Sensor: P ~ 0.5W Switchers: P ~ 0.5W DCDs/DHPs: P ~ 8W
- Inner cupper ladder covered with a polycarbonate dummy, opaque to IR
Camera positionT
(ºC
)(corrected emmisivity)
Sensor
Detector onBackground (room T)
End flanges cooled with CO2
Air flow at room T
Air/N2 flow cooled [-8,-15]C
C. Mariñas simulationAir flow studies
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- Sensor region (P~0.5W):
8th International Workshop on DEPFET Detectors and Applications
- Temperature for the sensor when switching on the detector: ~ 60 C- Cooling the endflanges (CO2): T sensor< 25 C (~ room T to check colder environment)- Blowing air at room T T sensor < 20 C and homogenus - Blowing cooled air (-8,-15) C T sensor < 15 C and homogeneus - Tmax along the sensor ~ 10 C (contact + remaining transparence)- For a proper T estimation from the enflanges one should have all detectors on (but should be ok following the Karlsruhe test
(see next page))
Camera position
T (
ºC)
Sensor Detector onBackground (room T)
End flanges cooled with CO2
Air flow at room T
Air/N2 flow cooled [-8,-15]C
Air flow studies
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From Karlsruhe (S. Heindl, Feb 2011) :
Silicon pieces with resistors (20W each) 120W + CO2 Cooling: Endflange at < -10 C (most probes)
PT1000s
8th International Workshop on DEPFET Detectors and Applications
Air flow studies
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- Switchers region (P~0.5W):
8th International Workshop on DEPFET Detectors and Applications
- Only right switcher was operating - Temperature for the switchers when the detector is switched on ~ 40 C- Cooling the endflanges (CO2): T sensor ~ 20-30 C (room T to check colder environm.)- Blowing air at room T T sensor < 25 C and homogenus - Blowing cooled air (-8,-15) C T sensor < 25 C and homogeneus - Small Tmax along the detector < 10 C
Camera position
T (
ºC)
Detector onBackground (room T)
End flanges cooled with CO2
Air flow at room T
Air/N2 flow cooled [-8,-15]C
Switchers
(corrected emmisivity)
Air flow studies
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Conclusions
- Valencia mockup set up and understood.
- At present, all tests show:
Cooled air flow decreases the ladder temperature below ~20C
Tmax along the ladder less or around 10C
- Valencia activity on thermo-mechanical issues will smoothly decrease in the
next year, but at present this setup may be used for any envisaged thermal test
In particular:
8th International Workshop on DEPFET Detectors and Applications
1.5m pipe coil at the CO2 return to cool down the air:Air flow temperature in the outlet ~ -5 - 0 C
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Mock-up
Until now, air or N2 gaseous cooled by the atmosphere inside the liquid N2 Dewar (-80C) New CO2 exchanged system to cool down the air flow:
8th International Workshop on DEPFET Detectors and Applications
- Test air flow cooling with the CO2 return
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Plans
Al samples
Carbon fibers
8th International Workshop on DEPFET Detectors and Applications
- Test air flow effect in the inner ladders (mainly for the switchers) through carbon fibers
- Set up the new endflanges of aluminium and/or stainless steel (ladders better screwed, better fixed and better thermal contact)
Arantza Oyanguren 8th International Workshop on DEPFET Detectors and Applications
Capacitive Non-Contact Displacement detectors:
ATLAS setup
- Test possible vibrations in the detectors due to the air flow
Plans
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Dummy ladders:
Heaters
Polycarbonate
Al
Cu
Backup
Resistor samples
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Backup
Air flow
20
22
24
26
28
30
32
34
36
0 0,5 1 1,5 2 2,5 3 3,5
Air v (m/s)
T (
ºC)
Inne ladder
Outer ladder
Cooling block
Effect of air velocity
- It is enough to have a very low speed flow air to achieve a proper heat dissipation in the ladder (1WT~ 6-7ºC),
(Expected behaviour from Carlos simulations)
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Inner ladder:
Backup
heaters (3W)
CO2, No air flow
Air flow T~0C*
* entering in the box; T in the CB?
Air flow T~-20C *
Camera positionT
(C
)