场极化方向对强激光加速电子效应的影响  

EFFECT OF FIELD POLARIZATION DIRECTION ON ACCELERATING ELECTRON WITH EXTRA-INTENSE STATIONARY LASER BEAM

作　　者：邵磊[1] 霍裕昆[1] 王平晓[1] 孔青[1] 袁祥群[1] 冯量 

机构地区：[1]复旦大学现代物理研究所,上海200433

出　　处：《物理学报》2001年第7期1284-1289,共6页Acta Physica Sinica

基　　金：国家自然科学基金! (批准号 :199840 0 1和 10 6840 0 1);国家高科技惯性约束聚变(ICF)基金;中国工程物理研究院基金;国家重点基

摘　　要：模拟研究了光场极化方向对自由电子与线偏振强激光束间发生净能量交换 (非弹性散射及加速效应 )的影响 .研究结果表明 ,当光场强度 0 .1 a0 1时 (a0 =eE0 mecω) ,电子在激光束上的散射呈现弱的非弹性效应 ,且与场的线偏振极化方向无关 ,表现为空间各向同性 ,与有质动力势模型的结果定性一致 .而当a0 10时 ,电子与光场间的净能量交换不仅变得明显 ,而且依赖于电子入射方向与场极化面之间的夹角 .当电子沿电场极化面入射时 ,净能量交换效应最显著 ,随着这一夹角的增大 ,这一效应逐渐减弱乃至消失 .此时电子在强光束上的散射表现出明显的空间各向异性 ,有质动力势模型已完全不再适用 .This article studies the effect of laser-field polarization direction on accelerating electrons with extra-intense stationary linear-polarization laser beam with 3D simulation of the relativistic Newton-Lorentz equation of motion.It is shown that there will exhibit remarkable inelastic effect of the electron scattering on the laser beam when the laser intensity a 0=eE 0/m ecω～102.But this effect is dependent on the angle between the incident direction of the electron and the field polarization direction plane of the laser.When the electron is injected along the electric field polarization plane, the inelastic effect of scattering becomes maximum.However,with increasing angle,this effect will come down gradually,even disappears.This means the electron cannot be captured or accelerated violently.Thus,as for the scattering of electrons the strong laser beam field displays anisotropic feature,and we cannot describe it by the conventional ponderomotive potential model.This study is of significance in experimentally testing the laser acceleration effect, as well as designing laser accelerators in the future.

关 键 词：强激光场 激光 电子 相互作用 场极化方向 强激光加速电子 净能量交换 激光加速器 

分 类 号：TN241[电子电信—物理电子学] TL501[核科学技术—核技术及应用]