The Hahvahd physics dept. has all number of interesting papers. For example there's Humphrey's dissertation:www.physics.harvard.edu/Thesespdfs/humphrey.pdf
If you've ever wanted to make your own Rb cell, how about this one?cfa-www.harvard.edu/~dphil/work/coat.pdf <http://cfa-www.harvard.edu/%7Edphil/work/coat.pdf%20> On Sun, Aug 29, 2010 at 11:07 AM, Attila Kinali <att...@kinali.ch> wrote: > On Sun, 29 Aug 2010 16:13:21 +0200 > Magnus Danielson <mag...@rubidium.dyndns.org> wrote: > > > On 08/29/2010 03:55 PM, Attila Kinali wrote: > > > Does anyone know whether any of those people collected their results > > > somewhere? And if, where i could find them? > > > > The physical package is definitely where most of the effort goes in. > > I know, that's why i'm asking. > The papers i've read sofar all suggest that the difficult part is to > compensate for cavity detuning, wall shift and second order doppler > effect. Somehow all these papers seem to assume that getting an > oscillation at all is so easy that everyone could do it (yes, i know that > this is normal with scientific papers). > > I thought, that if someone build a homebrew H maser, he'd write about > the difficulties getting there. Which would be a very interesting reading > and teach a lot about the physics (and tool making, mechanics, etc) > of these devices. > > > A > > complicating aspect is the self-tuning stuff for which several > > strategies may be chosen. > > I'd start here at getting a cavity that is resonant at the frequency > at all. Getting sub-milimeter precision in tooling is quite easy > (given you have the tools and knowledge, or can pay someone to do it for > you), > but if the cavity has to be resonant within a couple of Hz of the > 1.4xxxGHz, then you have to get a precission in the range of 10^-9 > which basically impossible mechanically. So the cavity would need to have > a mechanical tuning system too, but one that doesn't lower the cavity's > Q or add any additional resonant modes. > > > You need to balance the rate of the atoms, as both too few and too many > > kills the oscillation. > > Or get to the basic requirement of getting a pure H2 source to feed > the beam source. The beam source itself, including the dissociator, > would be a formidable project to do at home by itself. > > > The size of the glass-bulb is not a fixed thing, during research and > > development different sizes glass-bulbs is used to establish the > > wall-shift aspects in order to adjust for it, which is needed in order > > to make absolute measurements on the "free" atom resonance or compensate > > into that regard. > > Interestingly, i think that the bulb would be the easiest part > these days. At least around here, there are a few glas blowers > for the chemical/pharmaceutical industry that also do single pieces. > Getting it coated would only involve finding a company that does > teflon coating (there do seem enough of them). From what i gather > it's shape doesnt have to be exactly spherical down to the > sub-milimeter range. > > > As for reference, there is about one set of books and papers from a > > handful of journals and a bunch of patents which needs to the read in > > order to build up the knowledge-base for attempting something like it. > > Which papers/books would you recommend reading? > > And no, i don't think i'd attempt to build a H maser. > I'm quite confident i could do the electronics part, but i know that > i don't know anything when it comes to mechanics. Much less about > handling high vacuum and atomic gas beams. > > > It's a complicated field and several traps to fall into on the way. It > > is a fairly sizeable project to attempt. > > Yes, but it's fun to read about it :-) > > Attila Kinali > > -- > The trouble with you, Shev, is you don't say anything until you've saved > up a whole truckload of damned heavy brick arguments and then you dump > them all out and never look at the bleeding body mangled beneath the heap > -- Tirin, The Dispossessed, U. Le Guin > > _______________________________________________ > 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.