The bubble regime of the laser wakefield acceleration is one of the most recent and promising mechanisms for generating quasi-monoenergetic electron beams. In this work, we propose to study the dynamics of bubble (a wake structure devoid of electrons created in underdense plasma by a highly-intense ultrashort laser pulse) in a petawatt regime. The dependence of the electron beam energy and the quality of the electron beam on the shape of the bubble is the main motivation behind this work. The bubble length as well as bubble shape have been investigated using two-dimensional particle-in-cell simulations. The evolution of the bubble with time, and the correlation of bubble length (longitudinal and transverse radius) with the intensity of laser pulse have been revealed in this study. The change of bubble dimensions can be estimated by various determining factors such as the laser pulse focusing, the beam loading, the residual electrons, and the bubble velocity. It has also been con...

中文翻译：

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兆瓦状态下激光尾波加速中的等离子体气泡演化

激光尾波加速的气泡状态是产生准单能电子束的最新机制之一。在这项工作中，我们建议研究在帕特瓦状态下的气泡动力学（气泡结构（在高密度超短激光脉冲下在密集等离子体中没有电子产生的唤醒结构））。电子束能量和电子束质量对气泡形状的依赖性是这项工作的主要动机。气泡长度和气泡形状已使用二维单元格模拟进行了研究。这项研究揭示了气泡随时间的演变，以及气泡长度（纵向和横向半径）与激光脉冲强度之间的关系。气泡尺寸的变化可以通过各种确定因素来估算，例如激光脉冲聚焦，束负载，残余电子和气泡速度。它也一直在...