[time-nuts] Re: Project Great

[Lux, Jim]

On 11/28/21 1:06 PM, Marek Doršic wrote:
> Hi,
>
>      I'm also one of those fascinated by Project Great and this was The project inspired me to start with time related stuf.
>
> Can Cs clock be avoided by prolonged period at high altitudes? Assume you can spend a month at the summit. Is e.g. the Rb drift stable enought to compensate and obtain viable results?
>
>    .marek


Sadly, no...  That's what the Allan Deviation tells you.  It says 
"here's the best you can do, at this averaging time".  And a lot of 
sources may have a low flat spot in the curve, but it eventually trends 
up. Except for primary standards like Cs beam.

So if a Rb plateaus at, say, 1E-12, that's the best you're going to do.


Speaking of which, does anyone have a link to a "current state of the 
art" graph.

Kind of like this one from Vig, but with specific new technologies like 
CSAC etc

-------------- next part --------------
A non-text attachment was scrubbed...
Name: adev.png
Type: image/png
Size: 390900 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20211128/bf089d9d/attachment.png>