[time-nuts] Fwd: Re: homebrew H maser
J. Forster
jfor at quik.com
Wed Sep 1 23:37:36 UTC 2010
Yup. If you do use oil, you need an LN2 trap.
-John
===============
> Hi
>
> My guess is that you either need a cryo pump or ion pumps and a very good
> seal.
>
> Bob
>
>
>
> On Sep 1, 2010, at 5:15 PM, Robert Darlington <rdarlington at gmail.com>
> wrote:
>
>> 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!
>>
>> -Bob
>>
>> 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.
>>>
>>>
>>>
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>
More information about the time-nuts
mailing list