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arXiv 1708.01099physics.plasm-ph
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破波后低频等离子体波的产生

Generation of Low Frequency Plasma Waves After Wave-Breaking

Prabal Singh Verma

摘要:

采用一维粒子模拟方法研究了冷等离子体中非相对论静电波在破碎区的时空演化。结果表明,在热等离子体中,波破碎后等离子体被加热,但仍有一小部分初始能量以BGK模的形式保留在馀波中。这项工作的一个有趣的发现是,所得到的BGK波的频率被发现是低于电子等离子体频率,随着初始振幅的增加而降低。此外,破波后的加速机制也被发现不同于以前的工作。为了解释在数值实验中观察到的结果,构造了一个简化的理论模型,该模型与模拟结果吻合得很好。这些调查有直接相关的尾场加速实验。

英文摘要:

Spatio-temporal evolution of a non-relativistic electrostatic waves in a cold plasma has been studied in the wave-breaking regime using a 1D particle-in-cell simulation. It is found that plasma gets heated after the wave-breaking but a fraction of initial energy always remains with the remnant wave in the form of BGK mode in warm plasma. An interesting finding of this work is that the frequency of the resultant BGK wave is found be below electron plasma frequency which decreases with increasing initial amplitude. Moreover, the acceleration mechanism after the wave-breaking is also found to be different from the previous work. In order to explain the results observed in the numerical experiments, a simplified theoretical model is constructed which exhibits a good agreement with the simulation. These investigations have direct relevance in wake-field acceleration experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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