I hope this answers your question:
What's a bakeout?
In order to (i) keep read noise down (suppress the "snow") and (ii) prevent cosmic ray hits from permanently raising the read noise level by
damaging the detector, the EIT CCD is usually operated at a temperature of about -67 C. This temperature is achieved by passive cooling: the CCD chip
is thermally contacted to a titanium "cold finger" (at far left in the image above) that is attached to a radiator plate that is pointed at a piece
of sky perpendicular to the earth-Sun line.
umbra.nascom.nasa.gov...
EDIT: Ah, Amantine, you got to it before I did. :-D
[Edited on 6-17-2004 by EmbryonicEssence]
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