Preliminary evaluation of the Cs atomic fountain frequency standard at NMIJ/AIST

Kurosu, Takayuki; Fukuyama, Yasuhiro; Koga, Y.; Abe, Kaori

doi:10.1109/cpem.2002.1034923

Cited by 3 publications

(2 citation statements)

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“…The frequency correction for the gravitational shift is evaluated to be (−1.6 ± 0.1) × 10 −15 similar to NMIJ-F1 [3]. In contrast, the microwave power dependence shift has not yet been investigated.…”

Section: Other Effects and The Error Budgetmentioning

confidence: 99%

“…In National Metrology Institute of Japan (NMIJ), the first atomic fountain PFS, NMIJ-F1, was built and contributed to the calibration of TAI with an uncertainty of 4 × 10 −15 during the period 2005-2011 [3], [17], [18]. In 2007 we started to develop the second fountain, NMIJ-F2, aiming for an uncertainty of <1 × 10 −15 as an immediate goal.…”

Section: Introductionmentioning

confidence: 99%

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Preliminary Evaluation of the Cesium Fountain Primary Frequency Standard NMIJ-F2

Takamizawa

Yanagimachi

Tanabe

et al. 2015

IEEE Trans. Instrum. Meas.

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We describe the preliminary evaluation of the frequency corrections and their uncertainty in the cesium fountain primary frequency standard (PFS) NMIJ-F2 under development at National Metrology Institute of Japan (NMIJ). In NMIJ-F2, cold atoms generated from a vapor-loaded optical molasses in the (001) configuration are optically pumped to the Zeeman sublevels of m F = 0 to increase the number of atoms involved in the Ramsey interrogation. Moreover, a cryocooled sapphire oscillator with ultralow phase noise is employed as the local oscillator to avoid degradation of the frequency stability due to the Dick effect. As a result, we have obtained a very high fractional frequency stability of 9.7 × 10 −14 τ −1/2 . As for systematic frequency shifts, the fractional correction for the second-order Zeeman shift is experimentally estimated to be (−165.5 ± 0.5) × 10 −15 from the first-order Zeeman shift of atoms in m F = +1 launched to various heights. The fractional frequency correction for cold-atom collisions is estimated to be (+3.3 ± 0.4) × 10 −15 by extrapolating the frequency to zero density from the frequencies measured for various nonzero atom numbers. We will soon be able to make a comparison with other atomic fountain PFSs at the 1 × 10 −15 level.Index Terms-Atomic fountain clock, primary frequency standard (PFS), uncertainty evaluation.

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Section: Other Effects and The Error Budgetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%