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| Measurement and Calculation of C Field of Cesium Fountain Clock |
| LIU Hong-kang1,LIU Kun2,HAN Lei1,FANG Fang2,CHEN Wei-liang2,ZHENG Fa-song2,DAI Shao-yang2,ZUO Ya-ni2,LI Tian-chu1,2 |
1. School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
2. National Institute of Metrology, Beijing 100029, China |
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Abstract In the cesium fountain clock experiment, the magnetic uniformity of C field determines the uncertainty evaluation of the second order Zeeman frequency shift. Microwave excitation method can be used to measure the average value of the time-weighted magnetic induction intensity at each height of the C field. In order to obtain the actual magnetic field distribution of C field, the measurement results of microwave excitation method need to be de-weighted. To introduces two de-time-weighted algorithms and verifies them with simulation data. Finally, the C field of NIM6 cesium fountain clock is measured and calculated by microwave excitation method and two de-time-weighted algorithms combined with Monte Carlo uncertainty evaluation method.
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Received: 15 March 2022
Published: 21 February 2023
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2023, Vol. 44 
