无网格准静态模型用于高效模拟基于等离子体的加速器
Gridless Quasistatic Model for Efficient Simulation of Plasma-based Accelerators
AI总结：
本文提出一种无网格准静态算法，用于高效模拟基于等离子体的加速器，通过轴对称等离子体波浪的建模，减少计算成本，适用于未来纳米米发射度束的等离子体对撞机设计。
摘要：
基于等离子体的加速器的精确建模依赖于昂贵的数值模拟，因为激光-等离子体和束流-等离子体相互作用的复杂性。几种策略可以显著降低计算成本，例如利用许多实际情况下等离子体波浪的近轴对称性和准静态性质。本文提出了一种准静态算法，能够无需数值网格地建模轴对称等离子体波浪。无网格方法允许极细特征的解析，而不会显著增加计算成本。这在例如未来具有纳米米发射度束的等离子体对撞机设计中至关重要。所提出的模型已在Wake-T代码中实现，其中它与激光包络求解器和粒子束推动器耦合，以实现激光和束流驱动等离子体加速器的高效模拟。
英文摘要：
The accurate modeling of plasma-based accelerators relies on costly numerical simulations due to the complexity of laser-plasma and beam-plasma interactions. Several strategies can highly reduce the computational cost compared to 3D first-principles particle-in-cell simulations, such as exploiting the near axial symmetry and quasistatic nature of plasma wakefields in many practical cases. Here, we propose a quasistatic algorithm that enables the modeling of axially symmetric plasma wakes without the need of a numerical grid. The gridless approach allows extremely fine features to be resolved without a dramatic increase in computational cost. This is critical, e.g., for the design of future plasma-based colliders with nanometer emittance beams. The proposed model has been implemented in the Wake-T code, where it is coupled to a laser envelope solver and a particle beam pusher to enable the efficient simulation of laser- and beam-driven plasma accelerators.
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