A joke I think :-) referring to dihydrogen monoxide fountains Sent from my iPhone
On May 7, 2013, at 12:49 AM, Magnus Danielson <[email protected]> wrote: > Rather the opposit. They will be really compact and can have long > observationtime. > Cheers > Magnus > > -------- Originalmeddelande -------- > Från: Bob Camp <[email protected]> > Datum: > Till: Discussion of precise time and frequency measurement > <[email protected]> > Rubrik: Re: [time-nuts] GSP clock stabilitiy, Rb vs Cs > > Hi > > Fountain's don't work very well in zero G….:) > > Bob > > On May 6, 2013, at 12:23 AM, Magnus Danielson <[email protected]> > wrote: > >> 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 >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
