[time-nuts] Ultra Stable Rb

[Poul-Henning Kamp]

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In message <CA+oSWyWA2-bnGvfpMyDWPTxKU8OANiVkgQViJa5BrAenocmzhA at mail.gmail.com>, Skip Withrow writes:

>I did not want to  drive the EFC (to remove a many variables as
>possible).  The C-field was set to get the unit about on frequency at
>around 20Torr, then the supply voltage was tweaked to put it exactly
>on frequency.

>For the 238 day period ending 3Nov19 the aging was -3.76x10E-14 /day.
>Not bad as far as Rb goes, but I can certainly do better.

Keep in mind here is that you are not only dealing with the Rb's
aging, you are also dealing with outgassing from the "normal"
components and with a different mix of thermal transport mechanisms.

There is no reason to think that multi-variable equation has only
one flat spot.


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