Hi
Taking the “questions” topic in a bit different direction …..
If the FA-2 is like the other projects from the same people, there is active
work being done
on the project. That is likely to create updated code for the device as issues
are spotted. Is
anybody on the list linked into that side
In message
, Dana Whitlow writes:
>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.
Why would you need to cool them any more than you need to cool them
in a cesium
The atoms are laser cooled and held in a magneto-optical trap. It’s
basically a short, one-way fountain.
Cooling the microwave cavity would be useful for reducing the black body
radiation shift, but without checking the numbers, this would not be so
useful at the relatively low accuracy claimed
Observed on 3 R XSR, on 10 5065A decommissioned together after 10...20 years
of service (blue ones with Patek clock, green, black and green...with 10811A
and digital clock...) --they were replaced by a GPS based synchronisation
network--. plus some 5065A got here and there. The lamp assy I
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.
Corby, I have a question to add regarding the HP units: is the tip
temperature hot
enough to melt Rb in addition to providing vapor? If so, doesn't the
orientation of
the physics package in earth's gravity have to be about correct in order to
keep
the excess Rb in the tip?
Thanks,
Dana
On
JF, Reference your statement:
"Sorry, but I don't agree with your first statement about the 5065A :
after long use, the rubidium plates on the inner envelope of the lamp
(like silver on a mirror) and years after years the Rb light and photo I
decreases."
After working on the 5065A for over 40
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
In message
, Anders Wallin writes:
So sort of a "one-way/drop" fountain really ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be
Hi
In our case it was *Symmetricom* that was unaware of the exception. They
absolutely refused to accept the incoming shipment unless it was Hazmat.
The stock shipping box they supplied each time had great big Hazmat labels
on it.
Bob
> On Oct 25, 2019, at 11:22 PM, Tom Knox wrote:
>
>
>
>
Well I can't figure out how to attach the link but if you search for "hp
5071a shipping exemption" in google you will find :
"PDF] Shipping Instruction - Cesium & Rubidium ... - Microsemi how to"
Click on it and it will open a PDF of the form.
You will see that it exempts most requirements, the
Sorry, but I don't agree with your first statement about the 5065A : after
long use, the rubidium plates on the inner enveloppe of the lamp (like silver
on a mirror) and years after years the Rb light and photo I decreases. Finaly,
adjustement becomes imossible. The solution (as described a
a short writeup of our phase-meter/digital-DMTD tests with an Ettus B210 is
now on researchgate:
https://www.researchgate.net/publication/336825605_Software_Defined_Radio_Based_Phase_Meter_for_Frequency_Metrology
an ADEV of 2e-14 at 1s in 0.5 Hz bandwidth is fairly straightforward to
achieve, for
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
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