NIM has designed and constructed a cesium fountain as a new generation primary frequency standard. A series of performance measurements of the components and assemblies have been finished. A cold atomic cloud with diameter 1.5mm and temperature≤150μK has been observed in MOT set up. It is going to get the optical molasses designed for the fountain clock.%中国计量科学研究院设计与建造了作为新一代频率基准的铯原子喷泉,并已完成一系列元、部件的性能测量.在磁光阱中观测到冷原子云,其直径为1.5mm,原子温度≤150μK.下一步将获得为喷泉钟设计的光学粘团.
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