Nonlinear evolution of the Weibel instability with relativistic laser pulses
Nonlinear evolution of the Weibel instability with relativistic laser pulses
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DOI：
10.1063/5.0138855
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发表时间：
2023-03
影响因子：
2.2
通讯作者：
Y. Kuramitsu;Y. Matsumoto;T. Amano
中科院分区：
文献类型：
--
作者：
Y. Kuramitsu;Y. Matsumoto;T. Amano
利用相对论强激光脉冲研究了韦伯不稳定性。相对论短脉冲激光可以产生亚相对论高密度无碰撞等离子体。用两束相对论激光脉冲辐照平行双平面靶，产生了亚相对论无碰撞逆流等离子体。由于韦伯不稳定性的增长率与等离子体密度和速度成正比，因此韦伯不稳定性的空间和时间尺度可以比纳秒大型激光装置小得多。最近的理论和数值研究表明，在有无环境磁场的情况下，亚相对论区域中的天体物理无碰撞激波在宇宙射线加速中起着至关重要的作用。考虑到实验验证，我们讨论了可能的实验模型的韦伯不稳定性与强烈的短激光脉冲。为了证明实验的可行性，我们进行了2D粒子在细胞中的模拟作为第一步，在没有外部磁场的情况下，并讨论了在实验室中实现的非线性演化的韦伯不稳定性的最佳条件。
The Weibel instability is investigated using relativistic intense short laser pulses. A relativistic short laser pulse can generate a sub-relativistic high-density collisionless plasma. By irradiating double parallel planar targets with two relativistic laser pulses, sub-relativistic collisionless counterstreaming plasmas are created. Since the growth rate of the Weibel instability is proportional to the plasma density and velocity, the spatial and temporal scales of the Weibel instability can be much smaller than that from nanosecond large laser facilities. Recent theoretical and numerical studies have revealed that astrophysical collisionless shocks in sub-relativistic regimes in the absence and presence of an ambient magnetic field play essential roles in cosmic ray acceleration. With experimental verification in mind, we discuss the possible experimental models on the Weibel instability with intense short laser pulses. In order to show the experimental feasibility, we perform 2D particle-in-cell simulations in the absence of an external magnetic field as the first step and discuss the optimum conditions to realize the nonlinear evolutions of the Weibel instability in laboratories.