On 2/18/21 7:40 AM, Poul-Henning Kamp wrote:
--------
Bob kb8tq writes:
Even if you went with a different material, moving any of the specs listed
above by 10X would be pretty amazing.
That was the answer I expected :-)
What about geometry ?
Would things like whispering gallery improve things if we found a reasonable
way to produce them ?
I think that hits the key... a 10 X improvement is unlikely. That's why
everyone is looking at tiny atomic standards (like the CSAC or the 1
liter Hg-ion aka DSAC). Those get you (potentially) orders of magnitude
improvement.
The DSAC is an interesting beast - today, it's pretty expensive
(probably more than the notional $1M for a space USO), but potentially
that could come down, because you're not trying to make the perfect
crystal, in the perfect holder, in the perfect double dewar, with
fraction of a gnat's eyelash temperature control.
There is *enormous* interest (and there has been for 100 years or more)
in timekeeping (or other measurements) that are not affected by
"manufacturing precision" or "assembly and calibration skill".
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