基于ISMM方法的非均匀磁化等离子体湍流中电磁波传播特性研究

      Study on electromagnetic wave propagation characteristics of inhomogeneous magnetized plasma with different incidence angles based on ISMM

      • 摘要: 由于传统散射矩阵法(scattering matrix method, SMM)在计算过程中会产生奇异矩阵,本文基于改进的SMM (improved SMM, ISMM)结合一维磁化等离子体湍流模型,计算了等离子体湍流介质对电磁波在不同入射角下的反射系数和透射系数,同时分析了电磁波在非均匀磁化等离子体中的传播特性。结果表明,湍流的出现极大地影响了等离子体鞘套中电子的运动规律,使其运动过程中能量衰减增多,因此其在0~35 GHz的透射系数增大;另一方面外部磁场的增大,对左旋圆极化波与右旋圆极化波的传播特性影响相反,这是因为在左旋情况下,左旋圆极化波的旋转方向正好与电子的旋转方向相同,右旋圆极化波相反;随着入射角度的增大,相当于电磁波在等离子体湍流中的传播距离增大,导致更多的电磁波能量被吸收;此外,考虑非均匀磁化情况后,电磁波在0~35 GHz频段内的右旋圆极化的透射系数更大。这些结果为研究电磁波在非均匀磁化等离子体湍流介质的传播特性提供了理论依据。

         

        Abstract: Since the traditional scattering matrix method (SMM) generates singular matrix in the calculation process, this paper calculates the reflection coefficient and transmission coefficient of electromagnetic wave in plasma turbulent medium at different incident angles based on the improved SMM (ISMM) and one-dimensional magnetized plasma turbulence model, and analyzes the propagation characteristics of electromagnetic wave in inhomogeneous magnetized plasma. The results show that the turbulent flow greatly affects the motion of electrons in the plasma sheath, and the energy attenuation increases during the motion, so the transmission coefficient of the 0−35 GHz increases. On the other hand, the increase of the external magnetic field has opposite effects on the propagation characteristics of the left-circularly polarized wave and the right-circularly polarized wave, because in the left-circularly polarized wave, the rotation direction of the left-circularly polarized wave is exactly the same as the rotation direction of the electron, and the right-circularly polarized wave is opposite. With the increase of incidence angle, the propagation distance of electromagnetic wave in plasma turbulence increases, resulting in more electromagnetic wave energy being absorbed. In addition, considering the inhomogeneous magnetization, the transmission coefficient of right-handed circular polarization of electromagnetic waves in the 0−35 GHz band is larger. These results provide a theoretical basis for studying the propagation characteristics of electromagnetic waves in turbulent media of inhomogeneous magnetized plasma.

         

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