Azimuthal asymmetry in collective electron dynamics in relativistically transparent laser-foil interactions
Azimuthal asymmetry in collective electron dynamics in relativistically transparent laser-foil interactions
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DOI：
10.1088/1367-2630/16/9/093027
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发表时间：
2014-09-23
影响因子：
3.3
通讯作者：
McKenna, P.
中科院分区：
文献类型：
--
作者：
Gray, R. J.;MacLellan, D. A.;McKenna, P.
实验证明了在超强激光脉冲与相对透明目标的相互作用中，重动力驱动电子的集体动力学的不对称性。在有限透明度的情况下，加速电子束的二维轮廓从沿激光偏振方向排列的椭圆变为垂直于它的双瓣结构，当激光脉冲的很大一部分与电子共传播时。通过粒子胞内模拟研究了相互作用的时间分辨动力学。该结果为带电粒子对强激光场在扩展相互作用体积上的集体响应提供了新的见解，这对于广泛的应用非常重要，特别是对于涉及超薄目标箔的有前途的新型超强激光驱动离子加速机制的开发。
Asymmetry in the collective dynamics of ponderomotively-driven electrons in the interaction of an ultraintense laser pulse with a relativistically transparent target is demonstrated experimentally. The 2D profile of the beam of accelerated electrons is shown to change from an ellipse aligned along the laser polarization direction in the case of limited transparency, to a double-lobe structure aligned perpendicular to it when a significant fraction of the laser pulse co-propagates with the electrons. The temporally-resolved dynamics of the interaction are investigated via particle-in-cell simulations. The results provide new insight into the collective response of charged particles to intense laser fields over an extended interaction volume, which is important for a wide range of applications, and in particular for the development of promising new ultraintense laser-driven ion acceleration mechanisms involving ultrathin target foils.