[time-nuts] Fwd: Re: homebrew H maser

[J. Forster]

Metal diaphragm rough, sorbtion, then Ion is the way to go, IMO.

You only need LN2 to run the sorbtion until you get into the Ion range,
then you valve the sorbtion off.

Cryopumps are a PITA, IMO.

FWIW,

-John

==============


> Bob Camp wrote:
>> Hi
>>
>> My guess is that you either need a cryo pump or ion pumps and a very
>> good seal.
>>
>> Bob
>>
>
> You know.. a cryo/sorption pump might be the way to go.  Easy to use
> (just get some LN2) and they can pump down pretty fast. If you only need
> one or two pumpdown cycles, that might be the ticket.  "theBellJar" had
> a whole thing on homemade cryo pumps using stuff like pickle jars..
>
>
>
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