[time-nuts] You can build a fountain from the things you find at home...

paul swed paulswedb at gmail.com
Tue Sep 27 20:08:28 UTC 2011


Boy I have to go back and check. I thought fountains used lasers and such to
slow the atoms down. Are we speaking to some gas fountain without optics
much like a traditional CS standard?
Paul
WB8TSL

On Tue, Sep 27, 2011 at 3:46 PM, Poul-Henning Kamp <phk at phk.freebsd.dk>wrote:

> In message <CAP6i9MmntLTia=XXUafbyrp+e3=koc1TRSEvL=
> g05emepQ4v-w at mail.gmail.com>
> , brent evers writes:
>
> >So at its most basic, I'm wondering what type of clock would make the
> >most sense to consider - cesium fountain, or hydrogen maser?
>
> Based on what I can gather, a fountain is probably easier to make work
> than any of the other, from a pure _mechanical_ point of view.
>
> The important detail to remember here, is that the people who have
> built fountains so far, have all tried to get better performance
> than very mature hydrogen masers and high performance cesiums.
>
> If your goal is simply to make "something that works" you probably don't
> need 4 separate shields, niobium surface etc.
>
> That said, it's probably not a one weekend task.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>
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