Status and prospect of the Swiss continuous Cs fountain FoCS-2

Jallageas, Antoine; Devenoges, Laurent; Petersen, Michael; Morel, Jacques; Bernier, Laurent-Guy; Thomann, P.; Südmeyer, Thomas

doi:10.1088/1742-6596/723/1/012010

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…The comparison data are reported to the BIPM every day and contribute to the 5 d-grid computation of TAI. The frequency deviation of TAI from TT (the SI second on the geoid) is determined by the data of primary and secondary frequency standards (PSFS) worldwide reported in circular T. During the 14 months-long measurement in this research, 13 primary frequency standards reported data to the BIPM including the Cs fountain clocks (IT-CsF2 [60], METAS-FOC2 [61], NIM5 [62], NPL-CsF2 [63], NRC-FCs2 [4], PTB-CSF1, PTB-CSF2 [2], SU-CsFO2 [64], SYRTE-FO1, SYRTE-FO2, SYRTE-FOM [65]) and two thermal beam Cs clocks (PTB-CS1 and PTB-CS2 [66]). A Rb fountain clock (SYRTYE-FORb [67]) also contributed to…”

Section: Utc(kris) Satellite Link Tai and Ttmentioning

confidence: 99%

Absolute frequency measurement of the ¹⁷¹Yb optical lattice clock at KRISS using TAI for over a year

et al. 2021

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We report a measurement of the absolute frequency of the 1S0–3P0 transition in the 171Yb optical lattice clock at KRISS (KRISS-Yb1) for 14 months, which was referenced to the SI second by primary and secondary standards worldwide via International Atomic Time. The determined absolute frequency is 518 295 836 590 863.75(14) Hz with the relative frequency uncertainty of 2.6 × 10−16, which agrees well with other reports. This result is expected to contribute to the future update of the CIPM recommendation frequency of the secondary frequency standards.

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Section: Utc(kris) Satellite Link Tai and Ttmentioning

confidence: 99%

Absolute frequency measurement of the ¹⁷¹Yb optical lattice clock at KRISS using TAI for over a year

et al. 2021

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“…Besides making the intermodulation effect negligible [5][6][7], a continuous beam is also interesting from the metrological point of view. Indeed, the relative importance of the contributions to the error budget is different [8,9], in particular for density related effects (collisional shift and cavity pulling) and furthermore the evaluation methods differ notably. In this context, the evaluation of the second order Zeeman shift which requires a precise knowledge of the magnetic field between the two microwave interactions, in the free evolution zone, is a case in point.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the magnetic field profile in the atomic fountain clock FoCS-2 using Zeeman spectroscopy

et al. 2017

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Abstract. We report the evaluation of the second order Zeeman shift in the continuous atomic fountain clock FoCS-2. Because of the continuous operation and of its geometrical constraints, the methods used in pulsed fountains are not applicable. We use here time-resolved Zeeman spectroscopy to probe the magnetic field profile in the clock. The pulses of ac magnetic excitation allow us to spatially resolve the Zeeman frequency and to evaluate the Zeeman shift with a relative uncertainty smaller than 1 × 10 −16 .

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“…It is also convenient to observe the atomic cloud from all directions. The velocity-tunable property of the cold atomic beam is very useful for the applications of atom interferometry [2] , atomic clocks [5,14,15] , cold atomic collision [16] , and ultra-high-vacuum MOT loading [17,18] . We also demonstrated that the mean axial velocity of the cold cesium beam can be tuned from 4.5 to 8.0 m/s, while its flux remains above 10 10 atoms∕s.…”

mentioning

confidence: 99%

Velocity-tunable cold Cs atomic beam from a magneto-optical trap

Yan¹,

Wu²,

Huang³

et al. 2017

Chin. Opt. Lett.

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The construction of a two-dimensional magneto-optical trap with hollow cooling and pushing (2D-HP MOT) is reported in detail, and a velocity-tunable cold atomic beam produced by this 2D-HP MOT is demonstrated. The magneto-optical trap system, which is constructed by a transparent quartz tube, is low in price, easy to fabricate and assemble, and convenient for atomic trapping and detection. The mean axial velocity of the cold atomic beam can be tuned from 4.5 to 8 m/s, while the atomic flux remains at a level of 10 10 atoms∕s. This cold atomic beam source can be applied in the areas of high-precision measurements based on cold atoms.

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Status and prospect of the Swiss continuous Cs fountain FoCS-2

Cited by 5 publications

References 11 publications

Absolute frequency measurement of the ¹⁷¹Yb optical lattice clock at KRISS using TAI for over a year

Absolute frequency measurement of the ¹⁷¹Yb optical lattice clock at KRISS using TAI for over a year

Measurement of the magnetic field profile in the atomic fountain clock FoCS-2 using Zeeman spectroscopy

Velocity-tunable cold Cs atomic beam from a magneto-optical trap

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Status and prospect of the Swiss continuous Cs fountain FoCS-2

Cited by 5 publications

References 11 publications

Absolute frequency measurement of the 171Yb optical lattice clock at KRISS using TAI for over a year

Absolute frequency measurement of the 171Yb optical lattice clock at KRISS using TAI for over a year

Measurement of the magnetic field profile in the atomic fountain clock FoCS-2 using Zeeman spectroscopy

Velocity-tunable cold Cs atomic beam from a magneto-optical trap

Contact Info

Product

Resources

About

Absolute frequency measurement of the ¹⁷¹Yb optical lattice clock at KRISS using TAI for over a year

Absolute frequency measurement of the ¹⁷¹Yb optical lattice clock at KRISS using TAI for over a year