Title :
Cryogenic fountain development at NIST and INRIM: preliminary characterization
Author :
Levi, Filippo ; Calosso, Claudio ; Calonico, Davide ; Lorini, Luca ; Bertacco, Elio K. ; Godone, Aldo ; Costanzo, Giovanni A. ; Mongino, Barbara ; Jefferts, Steven R. ; Heavner, Thomas P. ; Donley, Elizabeth A.
Author_Institution :
Ist. Naz. di Ricerca Metrologica, Torino, Italy
fDate :
3/1/2010 12:00:00 AM
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.
Keywords :
blackbody radiation; cryogenics; frequency standards; laser cooling; microwave technology; INRIM; IT- CsF2; NIST-F2; blackbody radiation shift; cryogenic microwave interrogation region; primary frequency standards; twin laser-cooled Cs fountain; Cryogenics; Electromagnetic heating; Frequency; Laboratories; NIST; Nitrogen; Physics; Temperature dependence; Testing; Uncertainty;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2010.1453
