On 05/06/2013 02:29 AM, Mike S wrote:
On 5/4/2013 2:40 PM, Attila Kinali wrote:
Can anyone shed some light on why the GPS Cs beams have a worse stability
than the Rb vapor clocks?
I don't know, but it makes me wonder about things like
1) How sensitive is each to C-field tuning - i.e. for the same change in
C-field, by how much does each type change in relative frequency? (or
maybe it's exactly the same, I know nothing about the Zeeman effect) I'd
think there would be orbital changes in frequency, after all, it's
orbiting a big magnet.
Rubidium is more sensitive to C-field than Caesium.
2) How tight a lock can be obtained on each? i.e. might the physical
realizations of Rb clocks have a higher Q-factor?
The Q-value depends on the observation time, and for a Cs-beam this
translates into beam-length assuming constant speed. Foutains has much
better Q since they have longer observation time. H-masers started as a
beam with a "bounce-box" to prolong the observation time.
Cheers,
Magnus
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