Zhidkov Alexei, Nemoto Koshichi, Nayuki Takuya, Oishi Yuji, Fuji Takashi
Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka-shi, Kanagawa-Ken 240-0196, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2007 Jul;76(1 Pt 2):016401. doi: 10.1103/PhysRevE.76.016401. Epub 2007 Jul 5.
Very efficient generation of monoenergetic, about 1MeV , electrons from underdense plasma with its electron density close to the critical, when irradiated by an intense femtosecond laser pulse, is found via two dimensional particle-in-cell simulation. The stimulated Raman scattering of a laser pulse with frequency omega< or =2omega(pl max) gives rise to a giant electromagnetic vortex. In contrast to electron acceleration by the well-known laser pulse wake, injected plasma electrons are accelerated up to vortex ponderomotive potential forming a quite monoenergetic distribution. A relatively high charge of such an electron source makes very efficient generation of soft gamma rays with homega>300 keV .
通过二维粒子模拟发现，当用强飞秒激光脉冲照射时，在电子密度接近临界值的低密度等离子体中能非常高效地产生单能的、能量约为1兆电子伏特的电子。频率ω≤2ω(pl max)的激光脉冲的受激拉曼散射会产生一个巨大的电磁涡旋。与通过著名的激光脉冲尾波加速电子不同，注入的等离子体电子被加速到涡旋有质动力势，形成相当单能的分布。这种电子源相对较高的电荷量使得能非常高效地产生能量大于300千电子伏特的软伽马射线。
