Electron Acceleration and Bunch Generation by Intense Femtosecond Laser Pulse in Preplasma of a Target

• 来源期刊: 理论物理通讯(英文版)
• 学科: 工学
• 关键词: 强激光脉冲 飞秒激光脉冲 电子加速 高能电子束 束团 低密度 能量传递 电子能量
• 年，卷（期）: 2010,（8）
• 所属期刊栏目: Physics of Gases, Plasmas, and Electric Discharges
• 页码范围: 359-364
• 页数: 6页
• 分类号: TN241 TN24
• 语种: 英文

摘要

We present analytical studies of electron acceleration in the low-density preplasma of a thin solid target byan intense femtosecond laser pulse.Electrons in the preplasma are trapped and accelerated by the ponderomotive forceas well as the wake field.Two-dimensional particle-in-cell simulations show that when the laser pulse is stopped by thetarget,electrons trapped in the laser pules can be extracted and move forward inertially.The energetic electron bunchin the bubble is unaffected by the reflected pulse and passes through the target with small energy spread and emittance.There is an optimal preplasma density for the generation of the monoenergetic electron bunch if a laser pulse is given.The maximum electron energy is inverse proportion to the preplasma density.