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Cryogenic fountain development at NIST and INRIM: preliminary characterization

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11 Author(s)
Levi, F. ; Ist. Naz. di Ricerca Metrologica, Torino, Italy ; Calosso, C. ; Calonico, D. ; Lorini, L.
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This paper describes the new twin laser-cooled Cs fountain primary frequency standards NIST-F2 and ITCsF2, 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.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:57 ,  Issue: 3 )