基于粒子模拟方法，对三维空间电荷力的计算采用全三维塑性宏粒子模型。
Super particle model is used to compute the 3-d space charge forces based on PIC.
在一维模拟中，采用混合模型研究离子噪声，用包络方程描述电子束的，用离散的宏粒子模型描述离子。
In one-dimension simulation, the approach taken is a hybrid model where the ions are treated as distinct particles in one-dimension while the electron beam is treated using the beam envelope equation.
在该程序设计中，宏粒子采用环宏粒子模型，用体积加权模型将每一个宏粒子电量分配到格点上，相对于面积加权模型更加精确。
Ring structure macro particle is distributed on grid by the volume-weighted model method and can be more accurate than face-weighted method.
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