NIST-F1 is a caesium fountain atomic clock that serves as the United States' primary time and frequency standard. As of the summer of 2005, it is so accurate that it will neither gain nor lose one second in more than 60 million years. The clock took less than four years to test and build, and was developed by Steve Jefferts and Dawn Meekhof of the National Institute of Standards and Technology (NIST) physics lab in Boulder, Colorado.
A similar, one-of-a-kind atomic fountain clock with comparable accuracy is operated at the French Laboratoire Primaire du Temps et des Fréquences (LPTF).
Further improvements to NIST-F1. (News Briefs).(National Institute of Standards and Technology)(Brief Article)
Mar 01, 2002; NIST scientists have made several improvements to NISTs primary frequency standard, the cesium-fountain clock NIST-F1. The result...