Results of numerical modeling of the interaction of an electron beam propagating across relativistic plasma waves indicate that electron beam filamentation and focusing may occur under certain conditions. The model is based on solving the relativistic equation of motion in three dimensions for the individual electrons in a tenuous Gaussian beam, as they pass through a relativistic plasma wave. Several electron beam and plasma wave parameters were varied, and the results are summarized. One of the results is that the spacing of the electron beam filaments correlates with the wavelength of the plasma wave. The electron beam filaments appear as vertical slabs after the beam exits the plasma waves. The electron beam also compresses to a focus after it exits the plasma, and the focal distance depends on several parameters including the electron beam energy and phase velocity of the relativistic plasma wave. It is suggested that these focusing and filamentation phenomena may be the basis for diagnostics schemes for laser plasma interactions. The parameters used in the model were electron beam energies in the 5–50 keV range and plasma wave properties typical for the beat-wave produced by CO₂ lasers, which correspond to the facilities available in our laboratory. The limitations of these results to lower energy density beam and plasma regimes and to higher energy density regimes will be discussed.

中文翻译：

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由于与等离子体波的相互作用，电子束的成丝和聚焦

穿过相对论等离子体波传播的电子束相互作用的数值模拟结果表明，在某些条件下可能会发生电子束成丝和聚焦。该模型基于对细弱的高斯束中的单个电子在三个维度上求解相对论运动方程，因为它们通过相对论等离子体波。改变了几个电子束和等离子体波参数，并总结了结果。结果之一是电子束灯丝的间距与等离子体波的波长相关。在电子束离开等离子波后，电子束灯丝显示为垂直板。电子束在离开等离子体后也会压缩到一个焦点上，焦距取决于几个参数，包括电子束能量和相对论等离子体波的相速度。建议这些聚焦和成丝现象可能是激光等离子体相互作用诊断方案的基础。模型中使用的参数是 5-50 keV 范围内的电子束能量和 CO 产生的拍波的典型等离子波特性_{2 台}激光器，对应于我们实验室可用的设施。将讨论这些结果对较低能量密度束和等离子体状态以及较高能量密度状态的限制。