A δ f particle method for gyrokinetic simulations with kinetic electrons and electromagnetic perturbations
A δ f particle method for gyrokinetic simulations with kinetic electrons and electromagnetic perturbations
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DOI：
10.1016/s0021-9991(03)00228-6
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发表时间：
2003-08
影响因子：
4.1
通讯作者：
Yang Chen;S. Parker
中科院分区：
文献类型：
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作者：
Yang Chen;S. Parker
本文发展了一种δf粒子模拟方法，用于求解描述环形约束等离子体中湍流和反常输运的回旋动力学-麦克斯韦方程组。一个广义的分裂重量计划被用来克服由于快速的电子平行运动的时间步长的约束。高等离子体β下的不准确性问题通过使用与用于δf的相同的标记物粒子分布来解决，以评估安培方程中的βmi/meA项，其被迭代地求解。该算法是在三维环形几何使用场线以下的坐标。还讨论了电子-离子碰撞效应，这是很重要的，当动力学电子物理的实施。对于中等β，即β 1，但βmi/me 1，给出了环形几何中的线性基准。文中还给出了具有中等β的非线性模拟结果。
A δf particle simulation method is developed for solving the gyrokinetic-Maxwell system of equations that describes turbulence and anomalous transport in toroidally confined plasmas. A generalized split-weight scheme is used to overcome the constraint on the time step due to fast parallel motion of the electrons. The inaccuracy problem at high plasma β is solved by using the same marker particle distribution as is used for δf to evaluate the βmi/meA∥term in Ampere’s equation, which is solved iteratively. The algorithm is implemented in three-dimensional toroidal geometry using field-line-following coordinates. Also discussed is the implementation of electron–ion collisional effects which are important when kinetic electron physics is included. Linear benchmarks in toroidal geometry are presented for moderate β, that is, β≪1, but βmi/me≫1. Nonlinear simulation results with moderate β are also presented.