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NIST-F1 is a caesium
Caesium

Caesium or cesium is the chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of , which makes it one of only liquid metal that are liquid at or near room temperature....
 fountain atomic clock
Atomic clock

An atomic clock is a type of clock that uses an atomic resonance frequency standard as its timekeeping element. They are the most accurate time and frequency standards known, and are used as primary standards for international Time dissemination, and to control the frequency of television broadcasts and GPS satellite signals....
 that serves as the United States
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
' primary time
Time

Time is a component of the measurement used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects....
 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
National Institute of Standards and Technology

The National Institute of Standards and Technology , known between 1901 and 1988 as the National Bureau of Standards , is a measurement standards laboratory which is a non-regulatory agency of the United States Department of Commerce....
 (NIST) physics lab in Boulder, Colorado
Boulder, Colorado

Boulder is a Colorado municipalities#Home_Rule_Municipality that is the county seat and most populous city of Boulder County, Colorado, Colorado, in the United States....
.

The clock replaces NIST-7
NIST-7

NIST-7 was the atomic clock used by the United States from 1993 to 1999. The caesium beam clock served as the nation's primary time and frequency standard during that time period, but it has since been replaced with the more accurate NIST-F1, a caesium fountain atomic clock that neither gains nor loses one second in 60 million years....
, a caesium beam atomic clock used from 1993 to 1999.






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Nistf1ph
NIST-F1 is a caesium
Caesium

Caesium or cesium is the chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of , which makes it one of only liquid metal that are liquid at or near room temperature....
 fountain atomic clock
Atomic clock

An atomic clock is a type of clock that uses an atomic resonance frequency standard as its timekeeping element. They are the most accurate time and frequency standards known, and are used as primary standards for international Time dissemination, and to control the frequency of television broadcasts and GPS satellite signals....
 that serves as the United States
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
' primary time
Time

Time is a component of the measurement used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects....
 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
National Institute of Standards and Technology

The National Institute of Standards and Technology , known between 1901 and 1988 as the National Bureau of Standards , is a measurement standards laboratory which is a non-regulatory agency of the United States Department of Commerce....
 (NIST) physics lab in Boulder, Colorado
Boulder, Colorado

Boulder is a Colorado municipalities#Home_Rule_Municipality that is the county seat and most populous city of Boulder County, Colorado, Colorado, in the United States....
.

The clock replaces NIST-7
NIST-7

NIST-7 was the atomic clock used by the United States from 1993 to 1999. The caesium beam clock served as the nation's primary time and frequency standard during that time period, but it has since been replaced with the more accurate NIST-F1, a caesium fountain atomic clock that neither gains nor loses one second in 60 million years....
, a caesium beam atomic clock used from 1993 to 1999. NIST-F1 is approximately 10 times more accurate than NIST-7. NIST-F1 will eventually be replaced by the NIST-F2
NIST-F2

NIST-F2 is a caesium fountain atomic clock under construction that will serve as the United States' primary time and frequency standard. The clock will replace NIST-F1, a caesium fountain atomic clock used since 1999....
.

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).

External links and references

  • (National Institute of Standards and Technology)