Sent: Tuesday, December 04, 2012 9:19 AM
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92hgj...@mail.gmail.com
, Bill Dailey writes
On 12/05/2012 03:26 PM, Mark Kahrs wrote:
I couldn't resist and did a little reading.
So, the MIT Flea has MOT cells? That would seem to be the deal breaker to
me. The rest is just plumbing. And smoke and mirrors.
While participating at the NIST TF seminars, one of the tours was in
fact a
Hi
I went through a similar process quite a while ago. The dimensions of the
actual fountain can be quite small. One could make one the size of a shoe box
and still have it perform quite well.
Bob
On Dec 3, 2012, at 2:07 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message
OK now that I am setting out to build one. Would the challenge for a
amateur be that the components you build with are basically dirty. Some how
on the copper pipe it would need to be clean and then brazed I might guess.
All of that makes for a dirty element.
To the vacuum. I used to make vaccuum
I used to work on oxygen clean systems... that cleaning is done primarily
with liquid freon (R-113 and ultrasound - may be hard to get now). The
Vacuum stuff is expensive but off the shelf. The complicated part to me is
the lasers and microwave... in addition to the super-stable oscillator you
In message CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92hgj...@mail.gmail.com
, Bill Dailey writes:
If you look at the papers on portable rubidium fountains
they are significantly bigger than a shoebox (65 cm).
Diameter is controlled by dispersion of the launched atoms (=recovery rate)
-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Tuesday, December 04, 2012 9:19 AM
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
CAMPhiorJihW9z6-q0+Qfd
AM
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92hgj...@mail.gmail.com
, Bill Dailey writes:
If you look at the papers on portable rubidium fountains
...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Tuesday, December 04, 2012 9:19 AM
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV
[mailto:time-nuts-boun...@febo.com] On
Behalf Of paul swed
Sent: Tuesday, December 04, 2012 9:49 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] PTTI 2012, part 2
Basements the key. So for me bigger is better. Heck if its a rack thats ok.
It gets interesting
; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92hgj...@mail.gmail.com
, Bill Dailey writes:
If you look at the papers on portable rubidium fountains
they are significantly bigger than a shoebox (65 cm).
Diameter
...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Tuesday, December 04, 2012 9:19 AM
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV
Sent: Tuesday, December 04, 2012 9:19 AM
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92hgj...@mail.gmail.com
, Bill Dailey writes:
If you look at the papers
In message 50be4f1d.7020...@xtra.co.nz, Bruce Griffiths writes:
The lasers arent that difficult to make or expensive if one adopts a
modified Littrow ECDL configuration.
Laser diodes without AR coatings have been used successfully in such lasers.
Low noise current sources and close
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92hgj...@mail.gmail.com
, Bill Dailey writes:
If you look at the papers on portable rubidium fountains
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Tuesday, December 04, 2012 9:19 AM
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
Hi
A few kilometers of optical fiber should do the trick. Servo the fiber
temperature to keep things locked up.
Bob
On Dec 4, 2012, at 4:17 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 50be4f1d.7020...@xtra.co.nz, Bruce Griffiths writes:
The lasers arent that
and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92hgj...@mail.gmail.com
, Bill Dailey writes:
If you look at the papers on portable rubidium fountains
they are significantly bigger than
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Tuesday, December 04, 2012 9:19 AM
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
: Tuesday, December 04, 2012 9:19 AM
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
In message
CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92hgj...@mail.gmail.com
, Bill Dailey writes:
If you look
Continuing from previous posting...
Still, there are always a number of talks of more general interest to us time
nuts.
In the next few postings I'll give more details on a couple of topics:
- Neutrino time-of-flight update
Last years' faster-than-light neutrino fiasco is now old news, but
In message AB5B0278225B4BD483382A39E6834203@pc52, Tom Van Baak writes:
- USNO rubidium fountains
While many national labs have developed cesium fountains (for
accuracy), USNO has been gradually building rubidium fountain clocks
(for stability) and 4 of them are now fully operational.
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