High-energy electrons produced in subpicosecond laser-plasma interactions from subrelativistic laser intensities to relativistic intensities.
High-energy electrons produced in subpicosecond laser-plasma interactions from subrelativistic laser intensities to relativistic intensities.
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DOI：
10.1103/physreve.69.036405
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发表时间：
2004-03
期刊：
影响因子：
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通讯作者：
Y. Li;J. Zhang;Z. Sheng;J. Zheng;Z. Chen;R. Kodama;T. Matsuoka;M. Tampo;K. Tanaka;T. Tsutsumi;T. Yabuuchi
中科院分区：
文献类型：
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作者：
Y. Li;J. Zhang;Z. Sheng;J. Zheng;Z. Chen;R. Kodama;T. Matsuoka;M. Tampo;K. Tanaka;T. Tsutsumi;T. Yabuuchi
研究了亚皮秒激光与等离子体相互作用产生的正向超热电子在从亚相对论到相对论激光强度下不同激光偏振条件下的特性。当激光强度达到相对论时，p偏振激光产生的超热电子束的峰值从靶法向向激光传输方向移动。对于S偏振激光脉冲，超热电子主要指向激光轴向。超热电子的温度和最大能量远高于经验标度定律的预期。在相对论激光强度下，超热电子的能谱由亚相对论强度下的双温结构演化为单温结构。对于相对论激光强度，在激光条件下，正向超热电子对激光偏振的依赖性较小。激光放大自发辐射基座形成的预等离子体的存在在相互作用中起着重要的作用。一维细胞内粒子模拟重现了实验中观察到的大多数特征。
The characteristics of the forward hot electrons produced by subpicosecond laser-plasma interactions are studied for different laser polarizations at laser intensities from subrelativistic to relativistic. The peak of the hot electron beam produced by p-polarized laser beam shifts to the laser propagation direction from the target normal direction as the laser intensity reaches the relativistic. For s-polarized laser pulse, hot electrons are mainly directed to the laser axis direction. The temperature and the maximum energy of hot electrons are much higher than that expected by the empirical scaling law. The energy spectra of the hot electrons evolve to be a single-temperature structure at relativistic laser intensities from the two-temperature structure at subrelativistic intensities. For relativistic laser intensities, the forward hot electrons are less dependent on the laser polarization under the laser conditions. The existing of a preplasma formed by the laser amplified spontaneous emission pedestal plays an important role in the interaction. One-dimensional particle-in-cell simulations reproduce the most characteristics observed in the experiment.