Attila Kinali

On Tue, 21 Nov 2017 14:50:48 +0100 Attila Kinali <attila@kinali.ch> wrote: > The source for the Hydrogen atoms is usually a heated platinum > valve (a heated plate of platinum that is thin enough that the > Hydrogen will leak through). Several people pointed out that the valve is made of paladium and not of platinum. Sorry about that. And thanks to everyone who corrected me. Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson

Hi, Dana. > What does 'EFOS' mean? I hadn't heard the term before. EFOS was a series of masers made by Oscilloquartz in Switzerland, there is a little information on my website www.efos3.com under «about». The manuals for those masers are also available, lots of good info for the interested: http://www.leapsecond.com/museum/efos/ > I do hear mixed reports about where the conversion to atomic H > occurs, and consider the jury to still be out on that question. Well, I think that jury is in.. :) plenty of information in old papers on that part. Ole > I had thought that the volume of the storage bulb was much > smaller in out maser, perhaps in the pint to quart range. For a > frequency of ~1420 MHz, I guess it would take a cavity that is > operating in a somewhat higher than fundamental mode if the > volume is in the gallon regime as you suggest. But with the > narrow gain profile width of this transition, I supposed there'd > be no risk of the thing running in the wrong mode. > > Dana > > > On Tue, Nov 21, 2017 at 8:14 AM, Ole Petter Ronningen <opronningen@gmail.com >> wrote: > >>> On Tue, Nov 21, 2017 at 2:50 PM, Attila Kinali <attila@kinali.ch> wrote: >>> >>> [...] The advantage of the platinum valve >>> system is that it "generates" single atom Hydrogen, as required >>> by the maser. >> >> >> Picking nits here.. It was my understanding that the splitting of molecular >> hydrogen into atomic hydrogen happens using RF in the dissociator - not in >> the platinum leak valve. Is my understanding incorrect? >> >> >>> Within the cavity there is a small glass bulb that keeps the atoms >>> in the right position of the cavity field. >> >> >> 4.5 liters in EFOS type masers - so not *that* small. I believe other >> masers are the same order of magnitude. >> >> >>> Yes, IIRC normal numbers are several 10s to 100s of wall collisions >>> before the atom loses its state due to wall colisions and without >>> contributing to the signal. >>> >> >> Lifetime ~1 second I think >> >> >>>> I've long wondered what causes the slow frequency drift, typically >>> amounting >>>> to about 3E-14 over a time span of several months. >>> >>> Mostly changes in the wall coating leading to a different wall collision >>> shift and mechanical changes of the cavity dimension (think air pressure >>> and creep) leading to a different cavity pulling. To a lesser extend >>> it's the changes in the quality of the vacuum and number of Hydrogen >> atoms >>> in the cavity. >> >> >> Also aging of electronic components - coarse tuning of the cavity is done >> by temperature, and any drift if the temperature-sensor/amplifiers etc will >> result in drift. At least for EFOS type masers. >> >> Ole >> _______________________________________________ >> 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.