Instability of a thin conducting foil accelerated by a finite wavelength intense laser
Instability of a thin conducting foil accelerated by a finite wavelength intense laser
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DOI：
10.1088/1367-2630/17/3/033026
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发表时间：
2014-08
影响因子：
3.3
通讯作者：
Bengt Eliasson
中科院分区：
文献类型：
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作者：
Bengt Eliasson
考虑激光波场中的有限波长效应，推导了强激光加速薄箔的类瑞利-泰勒（RT）不稳定性的理论模型.这些有限波长效应导致电磁波从箔片的不稳定性引起的周期性结构的衍射，当箔片上的扰动具有与激光波数相当或大于激光波数时，这显著地修改了RT样不稳定性的增长速率。特别地，增长率在扰动波数近似等于激光波数处具有局部最大值。标准RT不稳定性，所产生的压力差的两侧之间的箔，近似恢复的扰动波数小于激光波数。指出了激光圆偏振和线偏振结果的差异。该模型具有重要意义的辐射压力加速薄箔，RT类不稳定性是显着的障碍。
We derive a theoretical model for the Rayleigh–Taylor (RT)‐like instability for a thin foil accelerated by an intense laser, taking into account finite-wavelength effects in the laser wave field. These finite-wavelength effects lead to the diffraction of the electromagnetic wave off the periodic structures arising from the instability of the foil, which significantly modifies the growth rate of the RT-like instability when the perturbations on the foil have wavenumbers comparable to or larger than the laser wavenumber. In particular, the growth rate has a local maximum at a perturbation wavenumber approximately equal to the laser wavenumber. The standard RT instability, arising from a pressure difference between the two sides of a foil, is approximately recovered for perturbation wavenumbers smaller than the laser wavenumber. Differences in the results for circular and linear polarization of the laser light are pointed out. The model has significance for radiation pressure acceleration of thin foils, where RT-like instabilities are significant obstacles.