Effects of polarization parameters on the motion and radiation characteristics of high-energy electrons
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摘要: 为了探究超强激光偏振参数的梯度变化对场内高能电子运动及辐射特性的影响, 首先以电磁学基本方程为基础, 推导并建立了初始动量为0的相对论性单电子加速模型, 其次编写无近似的数值模拟仿真程序进行迭代计算与理论分析, 取得了不同偏振参数的超强激光作用下单电子的运动以及空间辐射可视化数据。结果表明, 随着偏振参数δ由0到1逐渐增大, 电子的运动轨迹由2维平面振荡逐渐过渡为3维螺旋状前进, 绕旋幅度逐渐增大且轨迹投影逐渐趋向于正圆; 电子的功率辐射空间分布也从平面线性逐渐变为3维涡旋状, 由上下针状分叉逐渐变为平滑连接, 总体变化趋势可按形态划分为δ=0, δ∈(0, 0.6], δ∈(0.6, 0.99]以及δ=1共4个阶段。该结果为高能电子辐射研究提供了多视角的理论及数值依据, 对实际应用中精确探测超强激光各项参数是有帮助的。Abstract: In order to explore the gradient changes of super laser polarization parameters based on the high energy electron motion and the influence of radiation characteristics, based on the basic equation of electromagnetism, a relativistic electron acceleration model was derived and set up with the initial momentum of 0. Then a numerical simulation program of no approximation was developed for iterative calculation and theoretical analysis. Visualized data of single electron motion and space radiation under different polarization parameters were obtained. The results show that with the increase of the polarization parameter δ from 0 to 1, the trajectory of the electron gradually changes from 2-D plane oscillation to 3-D spiral, and the amplitude of rotation increases gradually, and the trajectory projection tends to be positive circle. The spatial distribution of electron power radiation gradually changed from planar linear to 3-D vortex, and gradually changed from up-down needle-like bifurcation to smooth connection. The general change trend can be divided into four stages according to morphology: δ=0, δ∈(0, 0.6], δ∈(0.6, 0.99] and δ=1. The results provide a theoretical and numerical basis for the study of high-energy electron radiation from multiple perspectives, and are helpful for the accurate detection of super-strong laser parameters in practical applications.
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Keywords:
- laser optics /
- electronic radiation /
- numerical simulation /
- polarization parameters
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图 1 静止电子与激光脉冲相互作用的示意图
Figure 1. Schematic diagram of static electron interaction with laser pulse
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图 2 偏振参数分别为0, 0.5, 0.93和1时单电子运动轨迹图
Figure 2. Single electron trajectories when polarization parameters are 0, 0.5, 0.93 and 1, respectively
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