NIST-F2

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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. NIST-F1 has a fractional inaccuracy of less than δf/f < 5 × 10^-16, the planned performance of NIST-F2 is δf/f < 1 × 10^-16.[1]

[edit] External links and references

• NIST Time and Frequency Div. - 2004: Strategic Focus 1 (National Institute of Standards and Technology)
• Wired.com How Super-Precise Atomic Clocks Will Change the World in a Decade
• NIST Caesium Fountains - Current Status and Future Prospects