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

Robert Darlington rdarlington at gmail.com
Wed Sep 1 21:15:10 UTC 2010

You can pickup oil diffusion pumps pretty inexpensively.   They're not quite
ion pumps but they get you way down there and they're fast.  With proper
traps you don't really have to worry about coating your experimental physics
package with oil.  They're cheap to run and easy to maintain.  Ion pumps are
about as simple as things get and could probably be made very easily by some
of us "vacuum-nuts" but I never had the need.  Turbo pumps probably won't do
the job and they're expensive and unforgiving.  Not only did one of mine
crash, it crashed when a sputtering gun melted through.  80,000 RPM spinning
foil blades don't like hitting the gun cooling water very much!

Good luck!


On Wed, Sep 1, 2010 at 2:30 PM, Chris Howard <chris at elfpen.com> wrote:

>   Given the quality of vacuum the manual seems to imply, I'm guessing this
>>  wont cut it.   I'll bet that even low impurity Teflon has a long bakeout
>>  period.
> Too bad they don't have some kind of "getter" to allow lower vacuum specs.
> I expect they thought of that.
> The thing does sound like a giant hydrogenated vacuum tube.
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