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. 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]

External links and references

1. ^ NIST Cesium Fountains — Current Status and Future Prospects (PDF)

• 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