论文标题

等离子体韦克菲尔德加速的晶格玻尔兹曼模拟

Lattice Boltzmann simulations of Plasma Wakefield Acceleration

论文作者

Parise, Gianmarco, Cianchi, Alessandro, Del Dotto, Alessio, Guglietta, Fabio, Rossi, Andrea Renato, Sbragaglia, Mauro

论文摘要

我们通过使用称为晶格Boltzmann方法(LBM)的计算方法来探索血浆Wakefield加速度(PWFA)的新型模拟途径。 LBM基于连续动力学理论的离散化,同时确保对粗粒磁场的流体动力学(即密度,速度等)的收敛性。 LBM是计算流体动力学中建立的数值分析工具,能够在动力学理论和流体动力学之间有效桥接,但是到目前为止,它在PWFA的背景下的应用从未进行过研究。本文旨在填补这一空白。讨论了PWFA的LBM模拟结果,并将其与代码(架构师)实现冷流体(CF)模型的结果进行了比较。在流体动力框架中,我们讨论了与LBM固有的扩散特性相关的正则化效应的重要性,从而超越了传统的CF近似值。还解决了计算效率的问题。

We explore a novel simulation route for Plasma Wakefield Acceleration (PWFA) by using the computational method known as the Lattice Boltzmann Method (LBM). LBM is based on a discretization of the continuum kinetic theory while assuring the convergence towards hydrodynamics for coarse-grained fields (i.e., density, velocity, etc.). LBM is an established numerical analysis tool in computational fluid dynamics, able to efficiently bridge between kinetic theory and hydrodynamics, but its application in the context of PWFA has never been investigated so far. This paper aims at filling this gap. Results of LBM simulations for PWFA are discussed and compared with those of a code (Architect) implementing a Cold Fluid (CF) model for the plasma. In the hydrodynamic framework, we discuss the importance of regularization effects related to diffusion properties intrinsic of the LBM, allowing to go beyond the traditional CF approximations. Issues on computational efficiency are also addressed.

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