利用FDTD方法研究毫米波涡旋在磁化等离子体中的传播特性
The study of propagation characteristics of millimeter-wave vortex in magnetized plasma by using FDTD Method
AI总结：
本文针对毫米波频段L-G模式涡旋难以稳定产生的问题，采用FDTD三维数值模拟，研究了圆柱波纹波导混合模式涡旋在磁化等离子体中的传播特性，为高效等离子体加热提供新途径。
摘要：
研究指出，毫米波涡旋可能有助于实现高效的等离子体加热，因为人们发现毫米波涡旋能够在磁化等离子体中传播，即使此时普通平面波处于截止状态。此前的研究假设涡旋场为自由空间解中的拉盖尔-高斯（L-G）模式，但在毫米波频段内，L-G模式涡旋的产生和稳定传播并不容易。另一方面，已知圆柱波纹波导的毫米波混合模式也具有涡旋特性。本文利用三维数值模拟，采用时域有限差分（FDTD）方法，研究了圆柱波纹波导混合模式的毫米波涡旋在磁化等离子体中的传播特性。
英文摘要：
It is pointed out that millimeter-wave vortex may contribute an efficient plasma heating since it was found that the millimeter-wave vortex can propagate in magnetized plasma even in which the normal plane wave is in cut-off condition. Then, it was assumed that the vortex field was the Laguerre-Gaussian (L-G) mode which is free-space solution, but the generation and stable propagation of the L-G mode vortex are not easy in the millimeter frequency range. On the other hand, it is known that millimeter-wave hybrid mode of cylindrical corrugated waveguide has also vortex property. In this paper, we investigate propagation characteristics of millimeter-wave vortex of a hybrid mode of cylindrical corrugated waveguide in the magnetized plasma by using three dimensional numerical simulations with finite-difference time-domain (FDTD) method.
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