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arXiv 2201.05473physics.plasm-phphysics.comp-ph
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等离子体尾场加速的格子Boltzmann模拟

Lattice Boltzmann simulations of Plasma Wakefield Acceleration

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

摘要:

本文采用格子玻尔兹曼方法(LBM)对等离子体尾场加速(PWFA)进行了数值模拟。LBM基于连续体动力学理论的离散化,同时确保粗粒度场(即,密度、速度等)。LBM是计算流体动力学中成熟的数值分析工具,能够有效地在动力学理论和流体力学之间架起桥梁,但其在PWFA背景下的应用迄今为止从未被研究过。本文旨在填补这一空白。LBM模拟PWFA的结果进行了讨论,并与代码(建筑师)实现冷流体(CF)模型的等离子体。在流体动力学框架中,我们讨论了正则化效应的重要性相关的扩散性质内在的LBM,允许超越传统的CF近似。计算效率的问题也得到了解决。

英文摘要:

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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