Laser-cooled gases offer an alternative to tip-based methods for generating high-brightness ion beams for focused ion beam applications. These sources produce ions by photoionization of ultracold neutral atoms, where the narrow velocity distribution associated with microkelvin-level temperatures results in a very low emittance, high-brightness ion beam. In a magneto-optical trap-based ion source, the brightness is ultimately limited by the transport of cold neutral atoms, which restricts the current that can be extracted from the ion-generating volume. We explore the dynamics of this transport in a 7Li magneto-optical trap ion source by performing time-dependent measurements of the depletion and refilling of the ionization volume in a pulsed source. An analytic microscopic model for the transport is developed, and this model shows excellent agreement with the measured results.

中文翻译：

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高亮度磁光阱锂离子源中的输运动力学

激光冷却气体提供了一种替代基于尖端的方法，用于为聚焦离子束应用生成高亮度离子束。这些源通过超冷中性原子的光电离产生离子，其中与微开尔文级温度相关的窄速度分布导致非常低的发射率、高亮度的离子束。在基于磁光阱的离子源中，亮度最终受到冷中性原子传输的限制，这限制了可以从离子生成体积中提取的电流。我们通过对脉冲源中电离体积的消耗和再填充进行时间相关测量，探索 7Li 磁光阱离子源中这种传输的动力学。开发了传输的分析微观模型，