太赫兹回旋脉塞的粒子模拟方法研究  

Research of Terahertz Cyclotron Oscillator Particle Simulation

作　　者：刘大刚[1] 王重阳[1] 廖树清[2] LIU Da-gang WANG Chong-yang LIAO Shu-qing(School of Physical Electronics, University of Electronic Science and Technology of China Chengdu 610054 Institute of Fluid Physics, China Academy of Engineering Physics Mianyang Sichuan 621900)

机构地区：[1]电子科技大学物理电子学院,成都610054 [2]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《电子科技大学学报》2017年第2期369-374,共6页Journal of University of Electronic Science and Technology of China

基　　金：中国工程物理研究院科学技术发展基金(2014B0402057)

摘　　要：分析了粒子模拟方法在模拟共形边界,特别是带此类边界的太赫兹回脉塞时引入计算误差的原因。给出了传统的共形网格差分算法的稳定性条件及两种通用的共形处理方法,并对两种方法的稳定性及准确性进行了分析。提出了一种新型的自适应共形网格剖分方法,该方法解决了共形网格的局限性问题。在有自主知识产权的全电磁粒子模拟软件CHIPIC上实现了该方法,并以一个圆柱波导验证了该方法的正确性。采用该方法模拟了工作于TE26模式的频率为0.42 THz的回旋脉塞及HE06模式0.22 THz准光腔回旋脉塞。The calculation errors of particle-in-cell（PIC） method at the conformal boundary are analyzed, especially for the conformal boundary at the THz cyclotron oscillator. The condition of stability and two general treatment methods for the conformal grid are put forward. And the stability and accuracy of these two conformal treatment methods are analyzed. Based on these analysis, an adaptive conformal cell subdivision method is developed. With this method, the problems of the limitation of the conformal grid are solved. The method is implemented on the electromagnetic particle simulation software CHIPIC and is verified by simulating a cylindrical waveguide. Finally, using this method, the THz cyclotron maser with TE26 and the quasi optical cavity cyclotron oscillator with HE06 are simulated successfully.

关 键 词：共性网格 截止频率 回旋脉塞 粒子模拟 太赫兹波 

分 类 号：TN12[电子电信—物理电子学]