This paper demonstrates the evaluation of the radial inhomogeneity of the magnetic field of an atomic fountain clock, which affects the Ramsey interference fringe visibility. Based on the simplified inhomogeneous magnetic field model, the relationship between the fringe visibility and the inhomogeneity of the magnetic field is obtained; a magnetic field broadening limit of 70 pT for the ${^{87}{\rm Rb}}$ fountain clock is observed when the interference fringes disappear. Magnetic field broadening of 100 pT in the local interaction region of the ${^{87}{\rm Rb}}$ atomic fountain clock is measured by a special magnetic-sensitive Ramsey interference method. It is verified that the non-uniform widening of the magnetic field is the cause of the absence of interference fringes of adjacent lines.

中文翻译：

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在⁸⁷ Rb原子喷泉时钟下通过磁敏Ramsey干涉条纹评估磁场的径向不均匀性

本文演示了对原子喷泉时钟磁场的径向不均匀性的评估，这会影响Ramsey干涉条纹的可见性。基于简化的非均匀磁场模型，得到了条纹可见度与磁场非均匀性之间的关系。当干扰条纹消失时，观察到$ {^ {87} {\ rm Rb}} $喷泉时钟的70 pT磁场扩展极限。在$ {^ {87} {\ rm Rb}} $的局部相互作用区域中，磁场扩展100 pT原子喷泉时钟是通过特殊的磁敏拉姆西干涉法测量的。证实了磁场的不均匀扩展是没有相邻线的干涉条纹的原因。