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Publication Citation: Medium-Term Frequency Stability of Hydrogen Masers as Measured by a Cesium Fountain

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Author(s): Thomas E. Parker; Steven R. Jefferts; Thomas P. Heavner;
Title: Medium-Term Frequency Stability of Hydrogen Masers as Measured by a Cesium Fountain
Published: June 02, 2010
Abstract: 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: Proc. 2010 IEEE Intl. Freq. Cont. Symp.
Pages: pp. 318 - 323
Location: Newport Beach, CA
Dates: June 1-4, 2010
Keywords: atomic frequency standards;cesium fountain;hydrogen maser
Research Areas: Physics, Time and Frequency
PDF version: PDF Document Click here to retrieve PDF version of paper (469KB)