陈再高,唐泽华. 复杂结构共形全电磁粒子模拟技术研究进展[J]. 电波科学学报,xxxx,x(x): x-xx. DOI: 10.12265/j.cjors.2024085
      引用本文: 陈再高,唐泽华. 复杂结构共形全电磁粒子模拟技术研究进展[J]. 电波科学学报,xxxx,x(x): x-xx. DOI: 10.12265/j.cjors.2024085
      CHEN Z G, TANG Z H. Conformal electromagnetic particle-in-cell technology for complex structures[J]. Chinese journal of radio science,xxxx,x(x): x-xx. (in Chinese). DOI: 10.12265/j.cjors.2024085
      Citation: CHEN Z G, TANG Z H. Conformal electromagnetic particle-in-cell technology for complex structures[J]. Chinese journal of radio science,xxxx,x(x): x-xx. (in Chinese). DOI: 10.12265/j.cjors.2024085

      复杂结构共形全电磁粒子模拟技术研究进展

      Conformal electromagnetic particle-in-cell technology for complex structures

      • 摘要: 全电磁粒子模拟方法可准确模拟强电磁场与电子束之间的非线性相互作用,被广泛应用于真空电子器件的数值模拟研究及参数的优化设计。传统全电磁粒子模拟采用电磁场时域有限差分(finite-difference time-domain, FDTD)方法计算器件内电磁场随时间的变化,FDTD方法采用正六面体单元的结构网格,会带来阶梯误差;电磁场有限元方法采用非结构网格能准确描述复杂模型,可用于复杂结构的电磁场数值模拟,但需求解大型逆矩阵,无法适用于电大尺寸结构的数值模拟。为准确模拟复杂真空电子器件内电磁场与电子束之间的非线性相互作用,国内外学者针对复杂结构共形全电磁粒子模拟技术方面取得了突破性研究进展,实现了基于共形FDTD方法的全电磁粒子模拟技术,开展了基于时域有限元的全电磁粒子模拟技术研究,并研制了数值模拟软件。为促进国内复杂结构共形全电磁粒子模拟技术研究及应用,本文对复杂结构共形全电磁粒子模拟技术研究中的关键技术进行了详细介绍,包括共形结构网格生成技术、电磁场共形FDTD技术、共形电子束发射技术和基于时域有限元的全电磁粒子模拟技术中发展的电磁场求解,计算过程中满足电荷守恒定律以及电场、电荷满足高斯定律等数值模拟技术。

         

        Abstract: The fully-electromagnetic particle-in-cell method can accurately simulate the nonlinear interaction between strong electromagnetic field and electron beam, this method is widely adopted in the design and parameter optimization in the vacuum electronic devices (VEDs). Traditional fully electromagnetic particle-in-cell method uses the finite-difference time-domain (FDTD) method to simulate electromagnetic wave in the device. The classical FDTD method uses the structured grid, which will bring the stair-cased error. The finite element method adopts the unstructured grid to accurately describe the complex model and can be used to simulate the electromagnetic field in complex structure, since this method needs to solve large inverse matrix, it is very difficult to employ this method to simulate large-scale structures. In order to accurately simulate the nonlinear interaction between electromagnetic field and electron beam in complex VEDs, researchers have made breakthrough in the field of conformal electromagnetic particle-in-cell (CEMPIC) method. The fully electromagnetic particle-in-cell method based on conformal FDTD method is realized, meantime, the electromagnetic particle-in-cell method based on finite-element time-domain (FETD) method is also proposed, and the numerical simulation codes are developed. To promote the research and application of CEMPIC for complex structures in China, the key techniques in the study of CEMPIC for complex structures are introduced in this paper in detail, including conformal structured grid generation, conformal FDTD method, conformal electron beam emission. The particle-in-cell method based on time-domain finite element method is also presented, the key technology including numerical solution of FETD, charge conservation and divergence-cleaning algorithms developed in the finite-element particle-in-cell (FEMPIC) is also unveiled .

         

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