激光-电子康普顿散射物理特性研究  

Physical properties of laser-electron Compton scattering

作　　者：葛愉成[1] 

机构地区：[1]北京大学物理学院和核物理与核技术国家重点实验室,北京100871

出　　处：《物理学报》2009年第5期3094-3103,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10675014)资助的课题~~

摘　　要：对激光-电子康普顿散射物理特性即能量特性和微分截面角分布进行了仔细的研究.计算结果显示出光子能量和微分截面角分布的简单结构.康普顿散射X射线光源具有散射光子的能量易调节、方向性好等特点.在入射电子束能量很高时,X射线近乎单向出射.光源色散度较大,但实验上可以获得色散(带宽)小的X射线.对于各种波长的激光,在很宽的电子束能量范围(1MeV—10GeV)内,散射X射线光子的总截面和前向发射圆锥内(半圆锥角1/γ,其中γ=E/m0c2是以电子静止能量(m0c2)为单位的总能量(E))的总截面几乎不变,分别为0.067mb和0.033mb.可见光波长区域的散射光子总截面非常小.这些结果对于建设新一代康普顿散射飞秒X射线光源具有参考意义.The energy properties and the differential cross-sections of laser-electron-Compton scattering are quantitatively investigated. The calculations show simple structures of the scattered photon energy and the angular distribution of the differential cross- section. At high incident electron energy, Compton scattering X-ray source has features of easily tunable photon energy and small forward emission angle. Although the dispersion of Compton scattering X-ray source is large, narrow bandwidth X-ray emission can be obtained experimentally by using specific monochromatic filter. The total cross-section and the cross-section within the forward emission angle （ 〈 1/γ, where γ = E/ m0 c^2 is the total electron energy （E） in the unit of its static energy （ m0 c^2 ） ） change slightly for different laser wave lengths and different incident electron energies in a broad range from 1 MeV to 10 GeV. They have values of 0.067 mb and 0.033 rob, respectively. The total cross-section of the visible lights is very small. These results may be useful for building new generation ultra-short X-ray source based on Compton scattering technique.

关 键 词：康普顿散射 能量特性 微分截面 角分布 

分 类 号：O434.1[机械工程—光学工程]