Abstract Hydrogen masers are used extensively in time scale ensembles, but the frequency drift must be accurately known. NIST-F1, the cesium fountain primary frequency standard at the National Institute of Standards and Technology, now operates nearly every month and has provided an unprecedented opportunity to characterize the medium-term frequency stability (tau = 30 to 90 days) of six hydrogen masers. An unexpected observation was a moderate level of correlation in the frequency fluctuations of all the masers.
Proceedings Title: Proc. 2010 IEEE Intl. Freq. Cont. Symp.
Conference Dates: June 1-4, 2010
Conference Location: Newport Beach, CA
Pub Type: Conferences
atomic frequency standards, cesium fountain, hydrogen maser