CCD-world: Pleas help TASS

[Willie Koorts]

The following was posted to CCD-world:


On Tue, 9 May 2000, Willie Koorts wrote:

> I have seen (Peltier cooled systems, I think) where both charcoal and
> Zeolite was used for this very reason.  The charcoal was attached to the
> cold surface while the Zeolite container was kept at room temperature and
> made detachable (a simple pipe-thread screw fitting) to enable easy
> removal and re-generation.

I forgot to explain the reasoning behind this setup and also checked on
the cooling type - these were actually LN2 & closed cycle cooled systems
but might even have some merit with TE cooling.  The charcoal acts as the
getter and when warmed up, releases its cryopumped water.  The room
temperature Zeolite is only used as a desiccant, taking care of this
released water.

Regards
Willie

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