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arXiv 1507.08019physics.plasm-ph
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非均匀等离子体中相对论电子束等离子体不稳定性的二维研究

2-D studies of Relativistic electron beam plasma instabilities in an inhomogeneous plasma

Chandrashekhar Shukla, Amita Das, Kartik Patel

摘要:

相对论电子束在等离子体中的传输存在双流、双折射等微观不稳定性,在血浆中。这导致通过等离子体介质的电子输运受到严重限制。然而,最近,已经有实验证明了在碳纳米管结构的固体靶中改善兆安培电子电流(由强激光与固体靶的相互作用产生)的传输[Phys. Rev Lenness. 108,235005(2012)]。这表明非均匀等离子体(由碳纳米管结构靶的电离产生)有助于抑制束等离子体不稳定性的增长。这份手稿解决了这个问题的帮助下,详细的分析研究和模拟的帮助下,2-D粒子在细胞的代码。研究结论表明,当等离子体密度选择为非均匀时,只要非均匀等离子体的尺度长度1/ks小于典型等离子体趋肤深度(c/ωp0)尺度,二维几何结构中主要不稳定性的增长率减小。在这样小的尺度长度通道化的电流也观察到在模拟中。

英文摘要:

Relativistic electron beam propagation in plasma is fraught with several micro instabilities like two stream, filamentation etc., in plasma. This results in severe limitation of the electron transport through a plasma medium. Recently, however, there has been an experimental demonstration of improved transport of Mega Ampere of electron currents (generated by the interaction of intense laser with solid target) in a carbon nanotube structured solid target [Phys. Rev Letts. 108, 235005 (2012)]. This then suggests that the inhomogeneous plasma (created by the ionization of carbon nano tube structured target) helps in containing the growth of the beam plasma instabilities. This manuscript addresses this issue with the help of a detailed analytical study and simulations with the help of 2-D Particle - In - Cell code. The study conclusively demonstrates that the growth rate of the dominant instability in the 2-D geometry decreases when the plasma density is chosen to be inhomogeneous, provided the scale length 1/ks of the inhomogeneous plasma is less than the typical plasma skin depth (c/ωp0 ) scale. At such small scale lengths channelization of currents are also observed in simulation.

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