电子脉冲在飞秒电子衍射系统中的传输特性  

Transfer property of electron pulse in a femto-second electron diffraction system

作　　者：田进寿[1] 赵宝升[1] 吴建军[1] 赵卫[1] 侯洵[1] 刘运全[2] 张杰[2] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子学国家重点实验室,西安710068 [2]中国科学院物理研究所,北京100080

出　　处：《物理学报》2007年第1期123-128,共6页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:10527002)资助的课题~~

摘　　要：优化设计了一套超快电子衍射系统.用轨迹追踪法讨论了光电子在阴极上有150fs的时间弥散量,及其静态、动态特性(电子束斑、时间弥散、方位角、倾角)在超快电子衍射系统中的传输情况.用MonteCarlo方法对光电子的初始状态进行抽样、用有限差分法计算二维、三维空间电场分布,用有限元法计算磁场分布.An ultra-fast electron diffraction system has been designed. The static and dynamic characters of an electron pulse with 150 fs temporal dispersion are studied during its transmission in the whole ultra-fast electron diffraction system, including the size of the electron spot, temporal dispersion, distribution of azimuths and elevation angles. The initial status of the photoelectrons are put down by Monte Carlo method, both the two dimensional and three dimensional electric fields are calculated by finite difference method and the magnetic flux are calculated by finite element method.

关 键 词：时间弥散 空间弥散 偏转板 

分 类 号：O562[理学—原子与分子物理]