Excitation and control of large amplitude standing ion acoustic waves
Excitation and control of large amplitude standing ion acoustic waves
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DOI：
10.1063/1.5122300
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发表时间：
2019-09
影响因子：
2.2
通讯作者：
L. Friedland;G. Marcus;J. Wurtele;P. Michel
中科院分区：
文献类型：
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作者：
L. Friedland;G. Marcus;J. Wurtele;P. Michel
我们研究了大振幅驻离子声波（SIAWs）的形成与弱的，啁啾频率驻定有质动力驱动器的非线性锁相（自共振）。这些波包括非线性两相解，其中每个相位锁定到包括驱动的两个行波中的一个。当激励幅值超过阈值时，保证了系统的自谐振。通过在非线性离子流体模型中的水袋模拟来说明这种现象，并使用Whitham的平均变分原理进行分析。在自共振SIAWs的局部离子和电子密度可能会显着超过初始未扰动的等离子体密度，只有有限的动力学wave-breaking.We研究了形成大振幅驻波离子声波（SIAWs）的非线性锁相（自共振）与弱，啁啾频率的有质动力驱动。这些波包括非线性两相解，其中每个相位锁定到包括驱动的两个行波中的一个。当激励幅值超过阈值时，保证了系统的自谐振。通过在非线性离子流体模型中的水袋模拟来说明这种现象，并使用Whitham的平均变分原理进行分析。在自共振SIAWs的局部离子和电子密度可能会显着超过初始未扰动的等离子体密度，并仅限于动力学波破碎。
We study the formation of large-amplitude standing ion acoustic waves (SIAWs) by nonlinear phase-locking (autoresonance) with a weak, chirped frequency standing ponderomotive drive. These waves comprise a nonlinear two-phase solution, with each phase locked to one of the two traveling waves comprising the drive. The autoresonance in the system is guaranteed provided that the driving amplitude exceeds a threshold. The phenomenon is illustrated via water bag simulations within a nonlinear ion fluid model and analyzed using Whitham's averaged variational principle. The local ion and electron densities in the autoresonant SIAWs may significantly exceed the initial unperturbed plasma density and are only limited by kinetic wave-breaking.We study the formation of large-amplitude standing ion acoustic waves (SIAWs) by nonlinear phase-locking (autoresonance) with a weak, chirped frequency standing ponderomotive drive. These waves comprise a nonlinear two-phase solution, with each phase locked to one of the two traveling waves comprising the drive. The autoresonance in the system is guaranteed provided that the driving amplitude exceeds a threshold. The phenomenon is illustrated via water bag simulations within a nonlinear ion fluid model and analyzed using Whitham's averaged variational principle. The local ion and electron densities in the autoresonant SIAWs may significantly exceed the initial unperturbed plasma density and are only limited by kinetic wave-breaking.