M Kumagai et al 2008 Metrologia 45 139 doi:10.1088/0026-1394/45/2/003
M Kumagai, H Ito, M Kajita and M Hosokawa
Show affiliationsIn this paper, we describe the first caesium atomic fountain primary frequency standard NICT-CsF1 of National Institute of Information Communications Technology (NICT) in Tokyo, Japan. The structure of the NICT-CsF1 system and evaluation procedure of the systematic frequency shifts and their uncertainties are presented. Typically, NICT-CsF1 has a frequency stability of 4 × 10−13/τ1/2 and a frequency uncertainty of 1.9 × 10−15.
Issue 2 (April 2008)
Received 24 May 2007
Published 18 February 2008
M Kumagai et al 2008 Metrologia 45 139
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