Channeling of relativistic laser pulses, surface waves, and electron acceleration.
Channeling of relativistic laser pulses, surface waves, and electron acceleration.
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DOI：
10.1103/physrevlett.108.105001
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发表时间：
2012-03
影响因子：
8.6
通讯作者：
N. Naseri;D. Pesme;W. Rozmus;K. Popov
中科院分区：
文献类型：
--
作者：
N. Naseri;D. Pesme;W. Rozmus;K. Popov
采用三维粒子模拟和理论分析的方法，研究了高能相对论激光脉冲与欠密等离子体的相互作用。对于高于沟道阈值的功率，激光脉冲在1皮秒量级的时间期间在无电子沟道中作为单模传播。陡峭的激光前沿引起表面波的激发，沿着离子通道的尖锐边界沿着。表面波首先将电子捕获在通道壁上，并将它们预加速到相对论能量。然后，这些粒子具有足够的能量以在第二阶段中通过由电子感应加速器谐振引起的加速度与由表面波电场的纵向部分引起的加速度之间的相互作用而被进一步加速。有必要引入这两个阶段的过程来解释在模拟中观察到的大量高能电子。
The interaction of a high-energy relativistic laser pulse with an underdense plasma is studied by means of 3-dimensional particle in cell simulations and theoretical analysis. For powers above the threshold for channeling, the laser pulse propagates as a single mode in an electron-free channel during a time of the order of 1 picosecond. The steep laser front gives rise to the excitation of a surface wave along the sharp boundaries of the ion channel. The surface wave first traps electrons at the channel wall and preaccelerates them to relativistic energies. These particles then have enough energy to be further accelerated in a second stage through an interplay between the acceleration due to the betatron resonance and the acceleration caused by the longitudinal part of the surface wave electric field. It is necessary to introduce this two-stage process to explain the large number of high-energy electrons observed in the simulations.