[time-nuts] Re: Project Great

[Michael Wouters]

Hello Jim

Here is a relatively up to date plot that I made for the T&F course we give.
Labels are a bit misaligned courtesy of PowerPoint,
No CSAC, but there is an SDI cold Rb and a UAdelaide CSO.
Slightly different perspective to the Schmittberger et al plots that
Tom B referenced,

Cheers
Michael

On Mon, Nov 29, 2021 at 9:07 AM Lux, Jim <jim at luxfamily.com> wrote:
>
> 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
>
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