[time-nuts] Cold Rubidium?

[Bob kb8tq]

Hi

If you look at the ADEV plot, there is some sort of bump out in the 1 to 2 days region.
That would suggest it’s not 100% immune to the local environment….

The box is big enough that you *might* fit a chiller in it. If so, heat would need to be vented.
I see no (obvious) vents or heatsinks. 

Bob

> On Oct 26, 2019, at 3:04 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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