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首页> 外文期刊>Bulletin of the American Physical Society >APS -59th Annual Meeting of the APS Division of Plasma Physics - Event - Fluid Simulation of relativistic electron beam driven wakefield in the blowout regime
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APS -59th Annual Meeting of the APS Division of Plasma Physics - Event - Fluid Simulation of relativistic electron beam driven wakefield in the blowout regime

机译：APS-等离子体物理APS部门第59届年会-事件-井喷条件下相对论电子束驱动尾流的流体模拟

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Two-dimensional Fluid simulations are employed to study the Wakefield driven by an electron beam in a plasma medium. The 1-D results (Phys. of Plasmas, 22, 073109 (2015)) are recovered when the transverse extent of the beam is chosen to be much longer than its longitudinal extent. Furthermore, it is shown that the blowout structure matches closely with the PIC observations, before the phase mixing. A close comparison of the fluid observations with the analytical modeling made by Lu et al. (Phys. Rev. Lett., 96, 165002 (2006)) to PIC observations, have been provided. It is thus interesting to note that a simplified fluid simulation adequately represents the form of the wake potential obtained by sophisticated PIC studies. We also address issues related to particle acceleration in such a potential structure by studying the evolution of injected test particles. A maximum energy gain of $sim 2.8 GeV$ by the electrons from the back of the driver beam of energy $sim 28.5 GeV$ in a 10 cm long plasma is shown to be achieved. This is in conformity withthe experimental result of ref. (Phys. Rev. Lett, 95, 054802 (2005)). We observe that maximum energy gain can get doubled to $sim 5.7 GeV$ when the bunch of test particles was placed near the axial edge of the first blowout structure.
机译：二维流体模拟用于研究等离子体介质中电子束驱动的Wakefield。当梁的横向范围选择得比其纵向范围长得多时，可以恢复一维结果（Phys。of Plasmas，22，073109（2015））。此外，还表明，相混合之前，井喷结构与PIC观测值非常匹配。 Lu等人的分析模型将流体观测结果进行了比较。 （Phys。Rev. Lett。，96，165002（2006））提供给PIC观察。因此，有趣的是，简化的流体模拟足以代表通过复杂的PIC研究获得的尾流形式。我们还通过研究注入的测试粒子的演变来解决与这种潜在结构中的粒子加速有关的问题。在10厘米长的等离子体中，来自驱动器能量束$ sim 28.5 GeV $的电子实现了$ sim 2.8 GeV $的最大能量增益。这与参考文献的实验结果一致。 （Phys.Rev.Lett，95，054802（2005））。我们观察到，当将一堆测试粒子放在第一个井喷结构的轴向边缘附近时，最大能量增益可以增加一倍，达到sim 5.7 GeV $。

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