计算物理 ›› 2011, Vol. 28 ›› Issue (2): 243-249.

• 论文 • 上一篇    下一篇

粒子模拟中的一种高频噪声抑制算法

刘大刚, 周俊, 杨超, 蒙林   

  1. 电子科技大学物理电子学院, 四川 成都 610054
  • 收稿日期:2010-03-05 修回日期:2010-08-05 出版日期:2011-03-25 发布日期:2011-03-25
  • 作者简介:刘大刚(1973-),男,贵州遵义,主要从事电磁粒子模拟软件算法方面的研究工作.
  • 基金资助:
    国家自然科学基金(10676110)资助项目

An Arithmetic for Filtrating High-frequency Noise in Particle-in-cell Simulation

LIU Dagang, ZHOU Jun, YANG Chao, MENG Lin   

  1. School of Physical Electronics, University of Electronics Science and Technology of China, Chengdu 610054, China
  • Received:2010-03-05 Revised:2010-08-05 Online:2011-03-25 Published:2011-03-25

摘要: 对粒子模拟中的高频噪声的产生机理进行分析,并给出一种既能对高频数值噪声进行过滤又能满足Q值较高的相对论型微波器件计算要求的时域有限差分(FDTD)算法——High_Q FDTD算法.在中心差分FDTD算法和时偏FDTD算法的基础上,给出High_Q算法的计算公式,并着重分析算法的稳定性与收敛性.通过对相对论返波管(RBWO)的计算,将计算结果与中心差分和时偏FDTD算法的计算结果比较,验证算法有较好的滤波特性和计算精度.

关键词: 粒子模拟, FDTD算法, 高频噪声, 相对论粒子

Abstract: Mechanism of high-frequency noise in particle-in-cell(PIC) simulation is analysed.An effective finite-difference time-domain(FDTD) method called High_Q FDTD method is developed in which high-frequency noise is filtrated and high quality factor device is calculated with PIC simulation.Formulation of the method is derived on the basis of time-biased and centered-difference FDTD method.Stability and convergence of this method are well analysed.Filter efficiency and calculation precion of this method are compared with those of the time-biased and centered-difference FDTD method in computation of a relativistic backward wave oscillator(RBWO).

Key words: PIC simulation, FDTD method, high-frequency noise, relativistic particles

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