J. Forster wrote:
Boy I have to go back and check. I thought fountains used lasers and such
to slow the atoms down.
That's a trap. "Optical molasses".
A fountain essentially makes a beam and probes it orthogonal to the beam,
where the Dopplar shifts are low. The beam basically makes all the atoms
go in a single direction w/ no cross track velocities.
Caesium fountains actually use lasers to cool a "ball" of atoms and toss
it upwards through the RF cavities etc.
Detection is by interrrogation of the ball, usually after it falls back
down through the detector.
No continuous beam is involved. Using a relatively small number of atoms
that have been laser cooled reduces the interactions between them.
Are we speaking to some gas fountain without optics
much like a traditional CS standard?
Paul
WB8TSL
As to making one, I'd use stainless Conflat parts from eBay, used
commercial pumps, feedthroughs, fittings, etc. You can spend a lot of
time trying to leak check home brew stuff.
Astenetic stainless has the problem of being slightly ferromagnetic.
FWIW,
-John
================
Bruce
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