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首页> 外文期刊>Physics of plasmas >Particle-in-cell simulations of density peak formation and ion heating from short pulse laser-driven ponderomotive steepening
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Particle-in-cell simulations of density peak formation and ion heating from short pulse laser-driven ponderomotive steepening

机译：短脉冲激光驱动的锚固沉降密度峰形成和离子加热的粒子细胞仿真

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We use two-dimensional particle-in-cell (PIC) simulations and simple analytic models to investigate the laser-plasma interaction known as ponderomotive steepening. When normally incident laser light reflects at the critical surface of a plasma, the resulting standing electromagnetic wave modifies the electron density profile via the ponderomotive force, which creates peaks in the electron density separated by approximately half of the laser wavelength. What is less well studied is how this charge imbalance accelerates ions toward the electron density peaks, modifying the ion density profile of the plasma. Idealized PIC simulations with an extended underdense plasma shelf are used to isolate the dynamics of ion density peak growth for a 42 fs pulse from an 800nm laser with an intensity of 10(18) W cm(-2). These simulations exhibit sustained longitudinal electric fields of 200GV m(-1), which produce countersteaming populations of ions reaching a few kilo-electron-volt in energy. We compare these simulations to theoretical models, and we explore how ion energy depends on factors such as the plasma density and the laser wavelength, pulse duration, and intensity. We also provide relations for the strength of longitudinal electric fields and an approximate time scale for the density peaks to develop. These conclusions may be useful for investigating the phenomenon of ponderomotive steepening as advances in laser technology allow shorter and more intense pulses to be produced at various wavelengths. We also discuss the parallels with other work studying the interference from two counterpropagating laser pulses. (C) 2019 Author(s).
机译：我们使用二维粒子粒细胞（PIC）模拟和简单的分析模型来研究称为抗叉瘤沉降的激光等离子体相互作用。当正常入射的激光反射等离子体的临界表面时，所得到的驻使电磁波通过锚组力改变电子密度曲线，其在分离的电光密度中产生峰值的激光波长的峰值。研究得较少的是该电荷不平衡如何将离子加速到电子密度峰值，改变等离子体的离子密度曲线。具有延长的低强度等离子体架的理想化照片模拟用于将离子密度峰值生长的动态与强度为10（18）W（-2）的强度分离为42 fs脉冲的离子密度峰值生长的动态。这些模拟具有200gv M（-1）的持续纵向电场，其产生了达到少数千元电压的离子的占据群体。我们将这些模拟与理论模型进行比较，我们探讨了离子能量如何取决于等离子体密度和激光波长，脉冲持续时间和强度等因素。我们还提供了纵向电场强度的关系和密度峰的近似时间尺度。这些结论可用于调查锚击沉降的现象，因为激光技术的进步允许在各种波长下产生短且更强烈的脉冲。我们还讨论了与其他工作中的其他作品的平行区，研究了两个反向激光脉冲的干扰。 （c）2019年作者。

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