弯轨erenkov辐射计算中的稳相法  

Stationary phase method of calculating erenkov radiation spectrum of a charged particle moving in curved path

作　　者：李一丁[1] 张鹏飞[2] 张辉[1] 于淼[2] 

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10期121-125,共5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：从介质中沿弯曲轨道运动的带电粒子辐射的频谱角分布公式出发,分析了粒子速度大于介质中的光速时,稳相点在erenkov效应中所起的关键作用,并给出了通过在稳相点附近做渐近展开来计算弯轨erenkov辐射的稳相法.运用稳相法,计算了同步erenkov辐射在粒子轨道平面附近以及在临界角附近的频谱角分布.计算结果表明,同步erenkov辐射频谱的特征依赖于观测方向附近对应的稳相点性状,特别是在较大的临界角附近的频谱与小角度近似时很不相同.Based on the general expression for spectral-angular distribution of the radiation emitted by a charged particle moving in exterior medium,the essential role of stationary phase points in erenkov effect is investigated.And the stationary phase method of calculating spectral-angular distribution of erenkov radiation from a charged particle moving in curved path is proposed.By the stationary phase method,the asymptotic form of spectral-angular distribution of synchrotron-erenkov radiation is calculated,and the result indicates that the spectrum of synchrotron-erenkov radiation near critical angle θc is quite different from that near the plane of particle＇s orbit.

关 键 词：cerenkov效应 稳相点 稳相法 同步cerenkov辐射 

分 类 号：O571.33[理学—粒子物理与原子核物理]