自由电子激光与电磁场模式相互作用中粒子跟踪的自洽数值方法

A. Fisher, P. Musumeci, S. B. van der Geer
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引用次数: 5

摘要

本文提出了一种基于电磁场在有限辐射模式下的分解的FEL模拟新方法。每个模态振幅的演化简单地由能量守恒决定。该代码是作为一般粒子示踪框架的扩展而开发的,并为FEL社区已经可用的完善的数值模拟套件增加了重要的功能。该方法不是基于周期平均近似,可以处理长波长波导的FELs,因为它可能包括边界的色散效应。此外,它正确地模拟了低电荷系统,其中横向和纵向空间电荷力仍然在动力学中起重要作用。对于自由空间FEL相互作用,源依赖的扩展近似可以用来限制模拟场剖面所需的横向模式的数量,并加快系统演化的计算。详细研究了单通FEL放大器、高效率TESSA266场景和工作在零滑移状态下的太赫兹波导FEL三个例子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Self-consistent numerical approach to track particles in free electron laser interaction with electromagnetic field modes
In this paper we present a novel approach to FEL simulations based on the decomposition of the electromagnetic field in a finite number of radiation modes. The evolution of each mode amplitude is simply determined by energy conservation. The code is developed as an expansion of the General Particle Tracer framework and adds important capabilities to the suite of well-established numerical simulations already available to the FEL community. The approach is not based on the period average approximation and can handle long-wavelength waveguide FELs as it is possible to include the dispersion effects of the boundaries. Futhermore, it correctly simulates lower charge systems where both transverse and longitudinal space charge forces still play a significant role in the dynamics. For free-space FEL interactions, a source dependent expansion approximation can be used to limit the number of transverse modes required to model the field profile and speed up the calculation of the system evolution. Three examples are studied in detail including a single pass FEL amplifier, the high efficiency TESSA266 scenario and a THz waveguide FEL operating in the zero-slippage regime.
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