Transcript OPTICON JRA2 Board Gent April 2004

THERMAL MODELING OF THE
WIDE-FIELD INFRARED
CAMERA FOR THE CFHT
Philippe Feautrier a, Eric Stadler a, and Pascal Puget b
Laboratoire d'AstrOphysique de Grenoble, 414 rue de la Piscine,
38041 Grenoble, France
b LESIA, 5, place Jules Janssen 92195 MEUDON Cedex, France
a
[email protected]
19–24 June 2005
Scientific detector workshop 2005
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What is WIRCam ?
WIRCam is the next wide field IR camera for the CFH.
4 Hawaii 2RG IR detectors, 100 kg to be cooled using a CT1050 cryohead.
A complete thermal model of the instrument (permanent and transient analysis)
was used to assist the cryogenic design. The thermal model was done using the
I-deas/TMG thermal module with FEA.
The poster highlights the advantages of such a method for cryogenic cameras
design and integration.
19–24 June 2005
Scientific detector workshop 2005
2
Thermal modeling: transient analysis of the
WIRCam cold finger cooling down.
One image
every 2 hrs
19–24 June 2005
Scientific detector workshop 2005
3
Conclusions about thermal modeling
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The use of integrated software tools like I-deas
helps to the mechanical and thermal design of
cryogenic instruments. No translations.
Iterations model/measurements during system
integration. Thermal model easy to modify and to
adapt to un-complete systems, in order to fit the
simulations with partial temperature measurements
and to predict with more accuracy the system
behavior on the telescope.
Results from thermal simulations with Ideas/TMG in
good agreement with measurements
Thermal design avoided surprises during the
instrument integration .
WIRCam first light with the science grade
detectors: June/July 2005.
19–24 June 2005
Scientific detector workshop 2005
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