This paper describes the new twin laser-cooled Cs fountain primary frequency standards NIST-F2 and IT-CsF2, and presents some of their design features. Most significant is a cryogenic microwave interrogation region which dramatically reduces the blackbody radiation shift. We also present a preliminary accuracy evaluation of IT-CsF2.
Cryogenic Fountain Development at NIST and INRIM: Preliminary Characterization / Levi, Filippo; Calosso, CLAUDIO ELIGIO; Calonico, Davide; Lorini, Luca; Bertacco, Ek; Godone, A; Costanzo, Ga; Mongino, B; Jefferts, Sr; Heavner, Tp; Donley, Ea. - In: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL. - ISSN 0885-3010. - 57:3(2010), pp. 600-605. [10.1109/TUFFC.2010.1453]
Cryogenic Fountain Development at NIST and INRIM: Preliminary Characterization
LEVI, FILIPPO;CALOSSO, CLAUDIO ELIGIO;CALONICO, DAVIDE;LORINI, LUCA;
2010
Abstract
This paper describes the new twin laser-cooled Cs fountain primary frequency standards NIST-F2 and IT-CsF2, and presents some of their design features. Most significant is a cryogenic microwave interrogation region which dramatically reduces the blackbody radiation shift. We also present a preliminary accuracy evaluation of IT-CsF2.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
