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- W2069382022 abstract "Abstract : The National Institute of Standards and Technology operates a cesium fountain primary frequency standard, NIST-F1, which has been contributing to International Atomic Time (TAI) since 1999. During the intervening 11 years, we have improved NIST-F1 so that the uncertainty is currently delta integral/integral(sub 0) approximately 3x10(exp -16), dominated by uncertainty in the blackbody-radiation-induced frequency shift. In order to circumvent the uncertainty associated with the blackbody shift, we have built a new fountain, NIST-F2, in which the microwave interrogation region is cryogenic (80 K), reducing the blackbody shift to negligible levels. We briefly describe here the series of improvements to NIST-F1 that have allowed its uncertainty to reach the low 10-16 level and present early results from NIST-F2." @default.
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- W2069382022 date "2010-11-18" @default.
- W2069382022 modified "2023-09-23" @default.
- W2069382022 title "NIST F1 and F2" @default.
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