Hi Ed,
On 04/29/2012 05:46 PM, Ed Palmer wrote:
Hi Magnus,
Second, pictures. If anyone is interested, check out
http://s701.photobucket.com/albums/ww18/edpalmer42/Tracor%20304-B/ .
Nice photos. Thanks. GAS building up.
What does GAS mean?
Gear Acquisition Syndrome.
GAS is a diagnose which I think no time-nut would admit to. ;-)
that talks about cavities in general, but the calculations don't work.
I'm guessing that the Rb cell is changing the resonant frequency of the
cavity.
The glass pulls the cavity resonance somewhat, yes. A TE111 resonance
mode is typically used, allowing light to enter and leave at the ends
of the cylinder.
TE011 was used before, but it much larger.
Todays modern cells use a "loaded" cell (dielectrum added) to move the
resonance frequency down, which allows much smaller physical cells.
This unit is TE011 No dielectric, plain brass - not silver-plated, 2.495
inch diameter @ room temperature, length tunable from ~0.9 to 1.07 inches.
Not surprising, and actually I think I've read that during the day.
W.J.Riley "Rubidium Frequency Standard Primer" is a good
starting-point, but following the references should help.
I think just searching for "TE111 mode rubidium" cranks out a few
interesting things, such as:
http://dspace.thapar.edu:8080/dspace/bitstream/10266/968/1/Satyendr_Thesis.pdf
Thanks for that link. I have been searching, but it's like panning for
gold - lots of sand and dirt and a very few nuggets of gold.
Indeed. I have a few more hints on where it can be worth panning, as I
have gathered a few books on the subject.
Reading Riley's book (as I mentioned above) today has given much more
body to the subject. Learning things quickly. While his book isn't heavy
on the deep stuff, he summarize it so you get an overview and then gives
several hundreds of references.
Cheers,
Magnus
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