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采用三维测试粒子模拟(test-padicle simulation)的方法,研究了聚焦的飞秒脉冲强激光与超短电子束进行有质动力的散射过程.详细讨论了超短电子束经过不同激光延迟下有质动力散射的空间分布特征和能谱特征.提出了通过测量电子束的空间分布和能谱分布实现对超短脉冲电子束的脉冲宽度测量的方法.
A three-dimensional test-padicle simulation method was used to study the scattering process of focused femtosecond pulsed laser and ultrashort electron beams, and the effects of different laser delays The spatial distribution and energy spectrum of dynamic scattering are discussed.The method of measuring the pulse width of ultrashort pulse electron beam by measuring the spatial distribution and energy spectrum of the electron beam is proposed.