[time-nuts] Cold Rubidium?

[Dana Whitlow]

I can only answer one of your questions with any confidence, but I'd
suspect that the
chamber walls are cooled a fair bit in addition to being highly
reflective.  Your other
questions age very good ones, too, and I'm looking forward to *somebody*
answering
them.  I'd also love to hear the details of how they go about interrogating
that cloud of
cold Rb atoms in such a short time (< 100 msec).

Dana


On Sat, Oct 26, 2019 at 3:01 PM Richard (Rick) Karlquist <
richard at karlquist.com> wrote:

> The proverbial "dumb questions":
>
> Is there an actual refrigerator somewhere
> in this gadget, or are the Rb atoms in a
> room temperature vacuum and the laser cools
> just the atoms.  It appears to be the latter.
>
> So the enclosure has low emissivity so it
> doesn't transfer too much heat to the atoms
> by radiation?
>
> And is it correct that the atoms are not ionized
> to trap them because the laser does that?
>
> Rick N6RK
>
> On 10/26/2019 1:39 AM, Anders Wallin wrote:
> > ptti2018:
> >
> https://www.researchgate.net/publication/322920519_Long_term_frequency_instability_of_a_portable_cold_87Rb_atomic_clock
> > ifcs2018:
> >
> https://www.researchgate.net/publication/325499937_A_portable_cold_87_Rb_atomic_clock_with_frequency_instability_at_one_day_in_the_10-15_range
> >
> > this one is apparently a darpa/spectradynamics/nist effort, and there's a
> > similar story with muquans and syrte in france, see:
> > https://www.muquans.com/product/muclock/
> >
> >
> > On Fri, Oct 25, 2019 at 11:09 PM AC0XU (Jim) <James.Schatzman at ac0xu.com>
> > wrote:
> >
> >> Does anyone have any experience/first hand knowledge of this Cold
> Rubidium
> >> standard?
> >>
> >> <https://spectradynamics.com/products/crb-clock/>
> >> https://spectradynamics.com/products/crb-clock/
> >>
> >> The specs look very good. The mfr claims that, unlike traditional
> rubidium
> >> oscillators, it has no long-term drift.
> >> Thanks!
> >> Jim
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