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