Cryogenic fountain development at NIST and INRIM: preliminary characterization.
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.
Levi
Filippo
F
Istituto Nazionale di Ricerca Metrologica, Torino, Italy. f.levi@inrim.it
Calosso
Claudio
C
Calonico
Davide
D
Lorini
Luca
L
Bertacco
Elio K
EK
Godone
Aldo
A
Costanzo
Giovanni A
GA
Mongino
Barbara
B
Jefferts
Steven R
SR
Heavner
Thomas P
TP
Donley
Elizabeth A
EA