NSTX旋光模拟中法拉第旋转与Cotton-Mouton效应的相互作用
Interaction between Faraday rotation and Cotton-Mouton effects in polarimetry modeling for NSTX
摘要：
在美国国家球形圆环实验（NSTX）中，对真空室中心堆回射的电磁波极化演化进行了模拟。该模型说明，棉花-木桐效应-椭圆化由于垂直于传播方向的磁场-被示出为强烈加权的等离子体的高场区域。法拉第旋转和Cotton-Mouton效应之间的相互作用也清楚地确定。当波的偏振方向既不平行于也不垂直于局部横向磁场时，就会发生椭圆化。由于法拉第旋转在传播过程中改变了偏振方向，因此它也必然会影响所得的椭圆化。Cotton-Mouton效应本质上也导致极化方向的旋转，但这种效应在建模的等离子体条件下不太显著。在较长的波长下，相互作用增加，并且使偏振测量的解释复杂化。
英文摘要：
The evolution of electromagnetic wave polarization is modeled for propagation in the major radial direction in the National Spherical Torus Experiment (NSTX) with retroreflection from the center stack of the vacuum vessel. This modeling illustrates that the Cotton-Mouton effect-elliptization due to the magnetic field perpendicular to the propagation direction-is shown to be strongly weighted to the high-field region of the plasma. An interaction between the Faraday rotation and Cotton-Mouton effects is also clearly identified. Elliptization occurs when the wave polarization direction is neither parallel nor perpendicular to the local transverse magnetic field. Since Faraday rotation modifies the polarization direction during propagation, it must also affect the resultant elliptization. The Cotton-Mouton effect also intrinsically results in rotation of the polarization direction, but this effect is less significant in the plasma conditions modeled. The interaction increases at longer wavelength, and complicates interpretation of polarimetry measurements.
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