- Tytuł:
- NIST Cesium Fountains - Current Status and Future Prospects
- Autorzy:
-
Jefferts, S.
Heavner, T.
Parker, T.
Shirley, J. - Powiązania:
- https://bibliotekanauki.pl/articles/1814049.pdf
- Data publikacji:
- 2007-11
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
06.20.Fn
32.30.Bv
32.30.-r
32.10.Fn
32.80.Pj - Opis:
- We review the current status of the U.S. Primary Frequency Standard, NIST-F1. NIST-F1 is a laser-cooled cesium fountain based frequency standard with an inaccuracy of less thanδ f/f<5×$10^{-16}$; limited mainly by the radiation field in the room-temperature fountain (blackbody shift). NIST-F1 is one of the best cesium fountains currently contributing to international atomic time, but has reached a point that it is impractical to improve its accuracy substantially. Therefore we are building a new fountain, imaginatively named NIST-F2, with a cryogenic (77 K) Ramsey interrogation zone that lowers the blackbody shift by several orders of magnitude. NIST-F2 is currently undergoing final assembly, and we will discuss our planned (hoped for) performance, which includes frequency inaccuracy ofδ f/f<1×$10^{-16}$.
- Źródło:
-
Acta Physica Polonica A; 2007, 112, 5; 759-767
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł