【作者】 赵成伟； 李小平； 魏延年； 魏强； 高靖茹； 刘东林； 孙超； 刘彦明；

【Author】 ZHAO Chengwei;LI Xiaoping;WEI Yannian;WEI Qiang;GAO Jingru;LIU Donglin;SUN Chao;LIU Yanming;School of Aerospace Science and Technology, Xidian University;Key Laboratory of Information and Structure Efficiency in Extreme Environment, the Ministry of Education of China;Guangzhou Institute of Technology, Xidian University;

【机构】 西安电子科技大学空间科学与技术学院； 极端环境下装备效能教育部重点实验室； 西安电子科技大学广州研究院；

【摘要】 本文基于电磁波在圆柱等离子体中的多路径传播相位偏移,提出了一种获得非均匀圆柱等离子体径向电子密度分布的方法.多路径透射的实现采用聚焦透镜天线,透镜天线在等离子体中传播区域近似于焦斑尺寸,从而可忽略绕射影响.根据电磁波在不同层的传播长度及相位偏移与电子密度的关系,从最外层开始,可逐层获得不同层的电子密度.为验证该方法,在CST中仿真了多路径透射传播相移,采用该方法获得了电子密度分布,与预设的电子密度分布具有很好的吻合度.除最外层外,其余位置的诊断误差小于10%.多路径透射的诊断方法,比传统诊断方法具有更高的空间分辨率,可获得更精细的电子密度.更多还原

【Abstract】 Based on the multi-path propagation phase shift of electromagnetic wave in cylindrical plasma, a method to obtain the radial electron density distribution of non-uniform cylindrical plasma is proposed in this paper. The implementation of multipath transmission adopts a focusing lens antenna, which propagates in the plasma in a region approximately equal to the size of the focal spot, thus ignoring the diffraction effect. Based on the propagation thickness of electromagnetic waves in different layers and the relationship between phase shift and electron density, the electron density of different layers can be obtained layer by layer starting from the outermost layer. In order to verify this method, multi-path transmission propagation phase shift is simulated in CST, and the electron density distribution is obtained according to this method, which has a good fit with the preset electron density distribution. Except for the outermost layer, the diagnostic error is less than 10%. The diagnostic method of multipath transmission has higher spatial resolution and can obtain more precise electron density results than the propagation transmission diagnostic method.更多还原