A new field solver for modeling of relativistic particle-laser interactions using the particle-in-cell algorithm
A new field solver for modeling of relativistic particle-laser interactions using the particle-in-cell algorithm
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DOI：
10.1016/j.cpc.2020.107580
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发表时间：
2021-01-01
影响因子：
6.3
通讯作者：
Mori, Warren B.
中科院分区：
文献类型：
--
作者：
Li, Fei;Miller, Kyle G.;Mori, Warren B.
粒子网格（PIC）中的一种定制的有限差分场求解器提出了一种在强电磁波中提供更高保真度的波粒相互作用的算法。在许多感兴趣的问题中，具有相对论能量的粒子与相速度接近光速的强电磁场相互作用。由于（1）波的相速度中的色散误差，（2）电场和磁场之间以及粒子速度和位置之间的时间交错，以及（3）动量推进中的时间导数误差，可能会出现数值误差。对前两类误差进行了详细的分析。结果表明，对于主要沿特定方向运动的电磁波，采用法拉第和安培定律中不同k空间算子的场解算器，可以同时消除粒子推进器中的色散误差和磁场时间交错误差.通过自定义高阶有限差分算子，将新算法实现到OSIRIS中。通过PIC模拟，使用所提出的求解器与不同的粒子推进器相结合的方案进行了比较。结果表明，使用新的算法，与解析粒子推进器（假设恒定的字段在一个时间步长），可以导致一个单一的电子在强激光场的运动的精确建模与归一化矢量势，eA/mc（2），超过10（4）的典型细胞大小和时间步长。(C)2020爱思唯尔B. V.保留所有权利。
A customized finite-difference field solver for the particle-in-cell (PIC) A algorithm that provides higher fidelity for wave-particle interactions in intense electromagnetic waves is presented. In many problems of interest, particles with relativistic energies interact with intense electromagnetic fields that have phase velocities near the speed of light. Numerical errors can arise due to (1) dispersion errors in the phase velocity of the wave, (2) the staggering in time between the electric and magnetic fields and between particle velocity and position and (3) errors in the time derivative in the momentum advance. Errors of the first two kinds are analyzed in detail. It is shown that by using field solvers with different k-space operators in Faraday's and Ampere's law, the dispersion errors and magnetic field time-staggering errors in the particle pusher can be simultaneously removed for electromagnetic waves moving primarily in a specific direction. The new algorithm was implemented into OSIRIS by using customized higher-order finite-difference operators. Schemes using the proposed solver in combination with different particle pushers are compared through PIC simulation. It is shown that the use of the new algorithm, together with an analytic particle pusher (assuming constant fields over a time step), can lead to accurate modeling of the motion of a single electron in an intense laser field with normalized vector potentials, eA/mc(2), exceeding 10(4) for typical cell sizes and time steps. (C) 2020 Elsevier B.V. All rights reserved.