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Accuracy Evaluation of NIM5 Cesium Fountain Clock |
| LIU Nian-Feng**, FANG Fang, CHEN Wei-Liang, LIN Ping-Wei, WANG Ping, LIU Kun, SUO Rui, LI Tian-Chu |
National Institute of Metrology, Beijing 100013
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| Cite this article: |
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LIU Nian-Feng, FANG Fang, CHEN Wei-Liang et al 2013 Chin. Phys. Lett. 30 010601 |
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Abstract The NIM5 fountain clock is the second fountain clock built at NIM (National Institute of Metrology, China), and has been operating stably and sub-continually since 2008. The fountain operates with a simple one-stage optical molasses to collect cold atoms, which reduces the collisional frequency shift dramatically. The fractional frequency uncertainty is estimated to be 2×10?15. The typical frequency instability of 2.5×10?14 is obtained at 10 s. Comparisons with other fountain frequency standards worldwide demonstrate agreement within the stated uncertainties.
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Received: 01 August 2012
Published: 04 March 2013
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| PACS: |
06.30.Ft
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(Time and frequency)
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43.58.Hp
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(Tuning forks, frequency standards; frequency measuring and recording instruments; time standards and chronographs)
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95.55.Sh
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(Auxiliary and recording instruments; clocks and frequency standards)
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