[time-nuts] homebrew H maser

Bob Camp lists at rtty.us
Wed Sep 1 23:31:00 UTC 2010


Hi

You can get epoxies with very low outgassing numbers. Also you will be using very little of it.

Bob



On Sep 1, 2010, at 3:28 PM, Oz-in-DFW <lists at ozindfw.net> wrote:

> 
> 
> On 9/1/2010 12:18 PM, Bob Camp wrote:
>> Hi
>> 
>> My guess is that you put the adjuster entirely inside the vacuum enclosure.
>> Pump the gizmo down, stabilize it, measure where it's at. Do some math, pop
>> it open move the adjuster x.xx turns. Step and repeat. Possibly have a fine
>> and a coarse mechanical adjust screw. 
> How about getting really evil.  Why not just deform the cavity for
> coarse adjustment and rely on elastic deformation for fine?
>> It's a one time only sort of thing. You can afford to do it the hard way. 
> or the dirty evil way  ;-)
>> Another option would be to allow the screws to come through the envelope and
>> leak a little bit during the adjust process. Once you were done with
>> adjustment, seal them up with a low out gassing epoxy. 
> 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.
>> My guess is that
>> would be a problem thermally. If you need 0.001C gradients, you can't have
>> more than one thermal path to the cavity.
>> 
>> That's all getting complicated, and we're only talking about the easy to
>> understand and address stuff...
>> 
>> My understanding is that the guys at Kvarz spent years poking at their
>> design in the secret back room before it worked as well as it does today.
> I've been told that this is business is still highly empirical, so that
> tracks.
>> Bob
> Oz (in DFW - Rich Osman)
> 
> -- 
> mailto:oz at ozindfw.net    
> Oz
> POB 93167 
> Southlake, TX 76092 (Near DFW Airport) 
> 
> 
> 
> 
> 
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