[time-nuts] You can build a fountain from the things you find at home...
EWKehren at aol.com
EWKehren at aol.com
Tue Sep 27 20:55:29 UTC 2011
Having only been on the list little over two years I may revisit a subject
covered extensively in the past. With all the know how and dead HP Cs
tubes, would it not make more sense to explore rejuvenating Cs tubes and look at
ways to improve its performance. I have the innards of two tubes on my
window sill and I could envisioning cutting one or both end caps off to access
oven and Ion pump for rework. I do not think it will screw up the
remaining alignment. Compared to Fountain or Maser it would make a lot more members
happy, and meet my objective of KISS (keep it simple stupid). For the
record all my Cs tubes are FTS so I would not benefit from it.
Bert Kehren
In a message dated 9/27/2011 4:40:15 P.M. Eastern Daylight Time,
magnus at rubidium.dyndns.org writes:
On 27/09/11 22:23, Poul-Henning Kamp wrote:
> In
message<CAD2JfAgqBOEG-iyb5z2_RbJuLdj7SbVC5bofPnTK45RjeSrBvQ at mail.gmail.com>
> , paul swed writes:
>
>> Boy I have to go back and check. I thought fountains used lasers and
such to
>> slow the atoms down.
>
> They do. And a microwave field.
>
> But I still think it is easier to make work than the state selection
magnets
> in a CS.
>
> Of course, there's also the laser-based cesium to consider.
>
I agree fully. The state selection magnets (Stern-Gerlach experiment)
needs to provide a strong gradient field which may be hard to build for
the amateur. Building working RF section, vacuum assembly, oven I rate
as simpler. Still lot of work to do.
Laser based state-selection and state-detection would indeed be
possible, and move the challenges to the optical bench.
One possible aspect to the laser based state-selection and
state-detection is that the target could be another oven, such that
alternating direction cycling can be used. This addresses the
phase-shift issue between the arms in the RF assembly, assuming
sufficient stability otherwise. The same issue would not be as dominant
in the fountain.
Cheers,
Magnus
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