[time-nuts] Re: The Newest Second: NIST-F2

[Tom Van Baak]

That NIST news is from 2014; is your clock running a bit slow ;-) Still, 
thanks for posting, because it's timeless. A pair of comments:

 > https://www.nist.gov/si-redefinition/second/second-present

There are two short videos on that page. The first is only 5 minutes 
long where Steve Jefferts [1] gives an introduction to laser cooling and 
cesium fountains, plus views of the F2 clock. The second video is just 1 
minute long and features Andrew Ludlow. Whether newbie or seasoned time 
nut it's totally worth 6 minutes of your time. Even if you already know 
the physics cold, the videos are a good example how to communicate time 
metrology concepts succinctly.

 > First accuracy evaluation of NIST-F2 (behind paywall)

When this happens with US gov't work, head over to the superb open 
access archive of all NIST papers:

"NIST Time and Frequency Publication Database"
https://tf.nist.gov/general/publications.htm

The paper you refer to is:

"First Accuracy Evaluation of NIST-F2"
https://tf.nist.gov/general/pdf/2704.pdf

For those of you new to cesium standards the paper is a great example 
why a modern laboratory cesium clock is far more complex than just 9 192 
631 770 "vibrations" of a cesium atom.

/tvb

[1] More links:

https://www.nist.gov/news-events/news/2014/04/nist-launches-new-us-time-standard-nist-f2-atomic-clock
https://www.nist.gov/speech-testimony/nist-f2-atomic-clock-news-briefing-statement-steve-jefferts
https://www.nist.gov/about-us/nist-awards/2019-rabi-award-steven-jefferts


On 4/26/2022 10:16 AM, Brooke Clarke via time-nuts wrote:
> Hi:
>
> https://www.nist.gov/si-redefinition/second/second-present
>
> NIST Launches a New U.S. Time Standard: NIST-F2 Atomic Clock
> https://www.nist.gov/news-events/news/2014/04/nist-launches-new-us-time-standard-nist-f2-atomic-clock 
>
>
> First accuracy evaluation of NIST-F2 (behind paywall)
> https://iopscience.iop.org/article/10.1088/0026-1394/51/3/174
>