[time-nuts] Maser (oil diffusion rough pumps)

J. Forster jfor at quik.com
Thu Sep 2 19:34:38 UTC 2010

Hi Corby,

I don't doubt it for an instant. Oil pumps just don't hack it for UHV.

If you are going to use oil pumps for almost anything serious you must use
an LN2 trap.

In a He Leak Detector, for example, an oil system is often used. BTW,
Varian specifically say not to use Silicone oils as they permanently
destroy the mass specs.

Do you have an RGA on your MASER?




> John F.
> Google Maser contamination and you will find a Russian blurb describing
> what I'm talking about. Even with LN2 traps they had problems.
> Corby Dawson
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