Explicit symplectic methods for solving charged particle trajectories

Explicit symplectic methods for solving charged particle trajectories
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求解带电粒子轨迹的显式辛方法

DOI:
10.1063/1.4982743
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发表时间:
2017-05
期刊:
影响因子:
2.2
通讯作者:
Qin Hong
Qin Hong
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhou Zhaoqi;He Yang;Sun Yajuan;Liu Jian;Qin Hong

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在本文中,我们考虑洛伦兹力系统的基础上,它的哈密顿公式。我们将洛仑兹力系统分解为四个子系统,这些子系统可以借助坐标变换来求解。通过坐标变换,建立了三种显式辛数值方法来模拟带电粒子在不含时电磁场中的运动。我们将我们的方法推广到具有含时外电磁场的系统,以及具有相对论效应的系统。数值实验表明,新方法在较长时间内具有较高的计算效率和精度。此外,逃逸电子的动力学的长期模拟进行。
In this paper, we consider the Lorentz force system based on its Hamiltonian formulation. We decompose the Lorentz force system into four subsystems which can be solved with the help of coordinate transformations. Via the coordinate transformations, three kinds of explicit symplectic numerical methods have been established for simulating the motion of charged particles under the time-independent electromagnetic field. We generalize our methods to solve the system with time-dependent external electromagnetic fields, and also the system with a relativistic effect. In numerical experiments, the computing efficiency and accuracy over a long time for the newly derived methods are demonstrated. Also, the long-term simulation for the dynamics of runaway electrons is performed.
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