[time-nuts] PTTI 2012, part 2

[Poul-Henning Kamp]

--------
In message <CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92Hgjo8A at mail.gmail.com>
, Bill Dailey writes:

>If you look at the papers on portable rubidium fountains
>they are significantly bigger than a shoebox (65 cm).

Diameter is controlled by dispersion of the launched atoms (=recovery rate)
and the layers of shielding.

65cm looked like close to a minimum for USNO grade, amateurs could probably
make do with less shielding.

-- 
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.