【摘要】 对工作于扫描状态下的飞秒电子衍射系统电子枪偏转量的计算方法作了理论研究,讨论了超快电子脉冲的测量方法,比较了相对论效应对电子束的偏转量及对电子束脉冲宽度的计算结果的影响,并做了相应的数值计算。计算结果显示,在忽略了电场的边缘效应等因素后,电子束轴向速度的相对论修正与否对偏转距离和电子束脉冲宽度的影响分别达到61.4mm和65fs。研究结果对超快电子枪偏转扫描系统的设计、对超短电子脉冲宽度的测量方法,尤其是对超短电子脉冲宽度的测量过程中的同步实验具有一定的指导意义。更多还原

【Abstract】 The deflection-scan subsystem of the femtosecond electron diffraction system was theoretically studied and an exact solution of the deflection distance was got.The numerical calculations under relativistic correction and non-relativistic correction show that the difference of the deflection distances is about 61.4 mm,and the difference of the electron pulse widths is about 65 fs.The result can be useful for the design of the subsystem and the test of the time resolution of the ultra-fast electron diffraction system,especially for the synchronization process of the test.更多还原