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improvements and new evaluation of nim4 cesium fountain clock and construction of nim5 clock in 2006
Author(s): 
Pages: 124-128
Year: Issue:  2
Journal: Engineering Sciences

Keyword:  GetLinkList(KeywordFilter('metrology time and frequency standards cesium fountain clock')'kw''CJFQ');
Abstract: The NIM4 cesium fountain clock has been operating stably and sub-continually since Aug. 2003. In this paper we present improvements on NIM4 in 2005-2006 and the most recent evaluation for its frequency shifts with an uncertainty of 5E-15. A 220 days comparison between NIM4 and GPS showed an agreement of 2E-14. Finally the construction of a NIM5 transportable cesium fountain clock is briefly reported.
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