Three dimensional pondermotive scattering of ultrashort electron beam in the field of focused ultraintense laser pulse
超短电子脉冲在聚焦强激光场中的三维有质动力散射

Using a three-dimensional test particle simulation code, we study the pondermotive scattering of an ultrashort electron beam subject to a focused ultraintense femtosecond laser pulse. The dependence of the spatial distribution of electron beam and electron energy spectrum on the time delay between laser pulse and electron pulse is discussed in detail. Through the measurement of the spatial distribution of electron beam or electron spectrum, we present a method to measure the duration of an ultrashort electron pulse.