Coulomb expansion of a cold non-neutral rubidium plasma
Coulomb expansion of a cold non-neutral rubidium plasma
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DOI：
10.1103/physreva.102.033303
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发表时间：
2020-05
影响因子：
2.9
通讯作者：
M. Viray;Stephanie A. Miller;G. Raithel
中科院分区：
文献类型：
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作者：
M. Viray;Stephanie A. Miller;G. Raithel
我们研究强耦合、非中性、圆柱形排列的离子等离子体向真空中的膨胀。等离子体由磁光陷阱 (MOT) 中的冷铷原子制成，并通过紫外光电离形成。研究高密度和低密度等离子体以表现出表明强耦合的不同方面。在较高密度的情况下，我们报告了等离子体激波前沿的形成和持续性，以及外场引起的等离子体聚焦效应。在较低密度区域，条件非常适合观察最近邻离子相关性的发展和演变，以及成对相关函数中几何引起的不对称性。轨迹模型和流体模型的模拟结果与测量结果非常吻合。
We study the expansion of a strongly coupled, non-neutral, and cylindrically arranged ion plasma into the vacuum. The plasma is made from cold rubidium atoms in a magneto-optical trap (MOT) and is formed via ultraviolet photoionization. Higher-density and lower-density plasmas are studied to exhibit different aspects indicative of strong coupling. In a higher-density regime, we report on the formation and persistence of plasma shock fronts, as well as external-field-induced plasma focusing effects. In the lower-density regime, conditions are ideal to observe the development and evolution of nearest-neighbor ion correlations, as well as geometry-induced asymmetries in the pair correlation function. Simulated results from a trajectory model and a fluid model are in good agreement with the measurements.