G. Le Bars , J. Loizu , S. Guinchard , J.-Ph. Hogge , A. Cerfon , S. Alberti , F. Romano , J. Genoud , P. Kamiński
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引用次数: 0
摘要
本文介绍了为研究具有方位对称性的几何结构中磁化非中性等离子体的形成而开发的新型二维静电粒子池内代码 FENNECS。该代码是在陀螺仪电子枪设计领域开发的,但可求解一般方程,并可应用于等离子体物理的其他领域。FENNECS 能够使用蒙特卡罗方法模拟电子-中性碰撞,并考虑弹性和非弹性(电离)过程。它还能在具有任意几何形状的域上求解泊松方程,并采用迪里希勒或自然边界条件。泊松求解器基于一种无网格有限元方法,称为网状样条,基于任意阶的 b 样条,首次用于等离子体物理领域。此外,代码中还实现了快速离子与电极碰撞并在电极表面引起离子诱导电子发射的效应。本文介绍了 FENNECS 所求解的支配方程以及用于求解这些方程的数值方法。然后报告了一些验证案例。最后,介绍了 FENNECS 中使用的并行化方案及其并行可扩展性。
FENNECS: A novel particle-in-cell code for simulating the formation of magnetized non-neutral plasmas trapped by electrodes of complex geometries
This paper presents the new 2D electrostatic particle-in-cell code FENNECS developed to study the formation of magnetized non-neutral plasmas in geometries with azimuthal symmetry. This code has been developed in the domain of gyrotron electron gun design, but solves general equations and can be applied in other domains of plasma physics. FENNECS is capable of simulating electron-neutral collisions using a Monte Carlo approach and considers both elastic and inelastic (ionization) processes. It is also capable of solving the Poisson equation on domains with arbitrary geometries with either Dirichlet or natural boundary conditions. The Poisson solver is based on a meshless Finite Element Method, called web-splines, based on b-splines of any order, and used for the first time in the domain of plasma physics. In addition, the effect of fast ions colliding with the electrodes and causing ion induced electron emission at the electrode surfaces has been implemented in the code. In this paper, the governing equations solved by FENNECS and the numerical methods used to solve them are presented. A number of verification cases are then reported. Finally, the parallelization scheme used in FENNECS and its parallel scalability are presented.
期刊介绍:
The focus of CPC is on contemporary computational methods and techniques and their implementation, the effectiveness of which will normally be evidenced by the author(s) within the context of a substantive problem in physics. Within this setting CPC publishes two types of paper.
Computer Programs in Physics (CPiP)
These papers describe significant computer programs to be archived in the CPC Program Library which is held in the Mendeley Data repository. The submitted software must be covered by an approved open source licence. Papers and associated computer programs that address a problem of contemporary interest in physics that cannot be solved by current software are particularly encouraged.
Computational Physics Papers (CP)
These are research papers in, but are not limited to, the following themes across computational physics and related disciplines.
mathematical and numerical methods and algorithms;
computational models including those associated with the design, control and analysis of experiments; and
algebraic computation.
Each will normally include software implementation and performance details. The software implementation should, ideally, be available via GitHub, Zenodo or an institutional repository.In addition, research papers on the impact of advanced computer architecture and special purpose computers on computing in the physical sciences and software topics related to, and of importance in, the physical sciences may be considered.