电子磁矩对同步辐射频谱的修正  

Modification from the spin to the synchrotron radiation from a relativistic electron

作　　者：李一丁[1] 张鹏飞[2] 张辉[1] 徐宏亮[1] 

机构地区：[1]中国科学技术大学国家同步辐射实验室,合肥230029 [2]中国科学技术大学近代物理系中国科学院基础等离子体物理重点实验室,合肥230026

出　　处：《物理学报》2013年第9期145-151,共7页Acta Physica Sinica

基　　金：国家基础研究重大项目前期预研专项基金(批准号:2001CCB01000);科技部ITER-CN项目(批准号:2010GB107001)资助的课题~~

摘　　要：本文从偶极子辐射场的Heaviside-Feynman表达式出发,用经典的电动力学方法推导了考虑内禀磁矩影响后的相对论电子辐射频谱分布的表达式,并对做匀速圆周运动的极端相对论性电子的同步辐射,计算了两个偏振方向上的考虑磁矩修正后的辐射谱.计算结果表明对于特征频率为ωc的同步辐射,如果hˉωc10keV,内禀磁矩对辐射的修正是可观的.通过同步辐射的内禀磁矩修正,本文讨论了电子束极化度与辐射场偏振度的依赖关系,并基于此关系提出一种测量电子束极化度的新方法.An explicit expression for the spectral distribution of the radiation energy from a relativistic electron with a magnetic moment is derived. Consequentially for an extreme relativistic electron moving along a planar circular orbit, the spectral distributions of synchrotron radiation in σ - and π- polarization are calculated including the modification from electron’s magnetic moment. It is shown that for the synchrotron radiation with high critical frequency ω c with hˉω c 10 keV, the modification may be considerable. The relationship between the polarization of synchronous electrons and radiation fields is obtained, and thus the information about spin polarization of electron beam from measuring the polarization of radiation fields is provided.

关 键 词：同步辐射 电子内禀磁矩 同步辐射偏振度 束流极化度 

分 类 号：TL501[核科学技术—核技术及应用]