[time-nuts] homebrew H maser

[J. Forster]

Questions like yours are what makes a good experimental physicist.

As to vacuum tight, you use bellows or put the inchworm inside the vacuum.

As to RF leakage, a waveguide below cutoff is one way. Another is to
design a choke seal, a 1/4 wave stub with a high Q cavity as the open end.

-Jhn

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> On Sun, 29 Aug 2010 10:03:02 -0700 (PDT)
> "J. Forster" <jfor at quik.com> wrote:
>
>>
>> [snip]
>> >> complicating aspect is the self-tuning stuff for which several
>> >> strategies may be chosen.
>> >
>> > I'd start here at getting a cavity that is resonant at the frequency
>> > at all. Getting sub-milimeter precision in tooling is quite easy
>> > (given you have the tools and knowledge, or can pay someone to do it
>> for
>> > you),
>> > but if the cavity has to be resonant within a couple of Hz of the
>> > 1.4xxxGHz, then you have to get a precission in the range of 10^-9
>> > which basically impossible mechanically. So the cavity would need to
>> have
>> > a mechanical tuning system too, but one that doesn't lower the
>> cavity's
>> > Q or add any additional resonant modes.
>>
>> A tuning plunger driven with a Burleigh Inchworm, either through a
>> bellows
>> or with a vacuum Inchworm.
>
> Yes, but that's only half of the story. How do you make it vacuum tight?
> And how do you design the end in the cavity so that you do not create
> unwanted resonant modi?
>
>
> 				Attila Kinali
> --
> If you want to walk fast, walk alone.
> If you want to walk far, walk together.
> 		-- African proverb
>
>