Having only been on the list little over two years I may revisit a subject covered extensively in the past. With all the know how and dead HP Cs tubes, would it not make more sense to explore rejuvenating Cs tubes and look at ways to improve its performance. I have the innards of two tubes on my window sill and I could envisioning cutting one or both end caps off to access oven and Ion pump for rework. I do not think it will screw up the remaining alignment. Compared to Fountain or Maser it would make a lot more members happy, and meet my objective of KISS (keep it simple stupid). For the record all my Cs tubes are FTS so I would not benefit from it. Bert Kehren In a message dated 9/27/2011 4:40:15 P.M. Eastern Daylight Time, mag...@rubidium.dyndns.org writes:
On 27/09/11 22:23, Poul-Henning Kamp wrote: > In message<cad2jfagqboeg-iyb5z2_rbjuldj7sbvc5bofpntk45rjesr...@mail.gmail.com> > , paul swed writes: > >> Boy I have to go back and check. I thought fountains used lasers and such to >> slow the atoms down. > > They do. And a microwave field. > > But I still think it is easier to make work than the state selection magnets > in a CS. > > Of course, there's also the laser-based cesium to consider. > I agree fully. The state selection magnets (Stern-Gerlach experiment) needs to provide a strong gradient field which may be hard to build for the amateur. Building working RF section, vacuum assembly, oven I rate as simpler. Still lot of work to do. Laser based state-selection and state-detection would indeed be possible, and move the challenges to the optical bench. One possible aspect to the laser based state-selection and state-detection is that the target could be another oven, such that alternating direction cycling can be used. This addresses the phase-shift issue between the arms in the RF assembly, assuming sufficient stability otherwise. The same issue would not be as dominant in the fountain. Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.