Closed Cycle coolers?

[Paul Jorden]

Hi everyone,

We're just considering the use of closed-cycle coolers for CCD use.
Does anyone have experience of using any instead of LN2?
Any comments on them versus LN2?
Any comments or specific experiences of different sorts of coolers?
We're about to try an APD Cryotiger in the lab. (#8k for system)- anyone tried 
it?
All comments welcome.

Regards, Paul Jorden
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