强激光与粒子束, 2018, 30 (8): 083203, 网络出版: 2018-08-21  

超短超强激光实验伴生电磁脉冲的模拟研究

Simulation study of ultrashort intense laser experiment associated with electromagnetic pulse
作者单位
中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621900
摘要
靶室腔体谐振产生的电磁辐射是超短超强激光与靶相互作用实验中生成的电磁脉冲(EMP)来源之一。基于有限元分析方法,对靶室腔谐振产生电磁脉冲和电磁脉冲通过窗口向外传播这两个过程进行仿真模拟。前者模拟获得空腔和含结构模型谐振时特征磁场,结果显示内部结构对电磁场强度分布和谐振频率有显著影响;后者模拟结果显示,窗口外侧电场强度比窗口内侧高约40%,而且电磁脉冲传播到靶室外后呈球面波形式扩散并衰减。对电磁脉冲的强度衰减规律进行了分析,得到该衰减曲线的拟合函数。
Abstract
The electromagnetic radiation produced by the resonance of the target chamber is one of the sources of electromagnetic pulse generated in the experiment of ultra-short intense laser and target interaction. Based on the finite element analysis method, we simulated the two processes of the electromagnetic pulse produced by the resonance of cavity and electromagnetic pulse propagating outward through windows. The former results show that the internal structure has a significant influence on the intensity distribution and resonance frequency of the electromagnetic field. The latter simulation results show that the electric field intensity outside the window is about 40% higher than that inside the window, and the electromagnetic pulse propagates to the target outside and then spreads and attenuates in the form of spherical wave form. The intensity attenuation rule is analyzed and the fitting function of the attenuation curve is obtained.

张露杭, 刘红杰, 谷渝秋, 曹磊峰, 周维民. 超短超强激光实验伴生电磁脉冲的模拟研究[J]. 强激光与粒子束, 2018, 30(8): 083203. Zhang Luhang, Liu Hongjie, Gu Yuqiu, Cao Leifeng, Zhou Weimin. Simulation study of ultrashort intense laser experiment associated with electromagnetic pulse[J]. High Power Laser and Particle Beams, 2018, 30(8): 083203.

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