Title :
Comparing room temperature and cryogenic cesium fountains
Author :
Heavner, T.P. ; Parker, T.E. ; Shirley, J.H. ; Donley, L. ; Jefferts, S.R. ; Levi, F. ; Calonico, D. ; Calosso, C. ; Costanzo, G. ; Mongino, B.
Author_Institution :
Time & Freq. Div., NIST, Boulder, CO, USA
Abstract :
We have compared the frequency of a room-temperature cesium-fountain primary frequency standard with that of a cryogenic (~80K) cesium fountain. This comparison yields a measurement of the blackbody frequency shift of the room-temperature fountain.
Keywords :
caesium; cryogenics; frequency standards; Cs; blackbody frequency shift measurement; cesium fountain; cryogenic temperature; primary frequency standard; temperature -80 K; temperature 293 K to 298 K; Cryogenics; Electromagnetic heating; Frequency measurement; Microwave measurements; NIST; Systematics; Uncertainty;
Conference_Titel :
Frequency Control and the European Frequency and Time Forum (FCS), 2011 Joint Conference of the IEEE International
Conference_Location :
San Fransisco, CA
Print_ISBN :
978-1-61284-111-3
DOI :
10.1109/FCS.2011.5977845
