Design of the new NIM6 fountain with collecting atoms from a 3D MOT loading optical molasses

We report the design of a new cesium fountain clock NIM6, which is under construction in NIM. Besides some improvements on the vacuum system, Ramsey cavity and microwave synthesizer to reduce the Type B uncertainty. Another major improvement on NIM6 is to collect more atoms from a MOT loading optica...

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Bibliographic Details
Published in2015 Joint Conference of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum pp. 492 - 494
Main Authors Fang Fang, Weiliang Chen, Kun Liu, Nianfeng Liu, Rui Suo, Tianchu Li
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.04.2015
Subjects
Atom optics
Atomic clocks
Atomic fountain clock
Cavity resonators
frequency measurement
Laser beams
Optical pumping
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Summary:We report the design of a new cesium fountain clock NIM6, which is under construction in NIM. Besides some improvements on the vacuum system, Ramsey cavity and microwave synthesizer to reduce the Type B uncertainty. Another major improvement on NIM6 is to collect more atoms from a MOT loading optical molasses and optical pumping to get a better signal to noise ratio at the detection. The atom distribution will be more uniform compared with a 2D MOT loading optical molasses, and the diameter of the cloud can be adjusted by the intensity and detuning of lights during the post cooling to keep the collisional-induced frequency shift low. The atom numbers can be further increased by a new de-pumping - optical pumping procedure to pump atoms to the |F=3, m F =0> clock state directly. With a new cryogenic sapphire oscillator (CSO) based frequency synthesizer, NIM6 is aiming to reach the quantum projection noise, thus leading to a reduced Type A uncertainty compared with NIM5.
ISSN:2327-1914
DOI:10.1109/FCS.2015.7138891