The study of propagation characteristics of the millimeter-wave vortex in magnetized plasma by using the FDTD method

IF 1.5 4区物理与天体物理 Q3 PHYSICS, APPLIED Japanese Journal of Applied Physics Pub Date : 2024-09-16 DOI:10.35848/1347-4065/ad6e94

Chenxu Wang, Hideki Kawaguchi, Hiroaki Nakamura and Shin Kubo

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Abstract

It is pointed out that the millimeter-wave vortex may contribute to an efficient method of 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 a 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 the millimeter-wave hybrid mode of the cylindrical corrugated waveguide also has vortex properties. In this paper, we investigate the propagation characteristics of a millimeter-wave vortex of a hybrid mode of a cylindrical corrugated waveguide in the magnetized plasma by using three-dimensional numerical simulations with the finite-difference time-domain (FDTD) method. It is found that the millimeter-wave vortex of hybrid mode also can propagate in the magnetized plasma even in a condition in which the normal plane wave is in cut-off condition, and the propagation power in the plasma is highly dependent on the topological charge l.

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利用 FDTD 方法研究磁化等离子体中毫米波涡旋的传播特性

研究指出，毫米波漩涡可能有助于一种有效的等离子体加热方法，因为研究发现，即使正常平面波处于截止状态，毫米波漩涡也能在磁化等离子体中传播。然后，假设涡旋场是拉盖尔-高斯（L-G）模式，这是一种自由空间解，但在毫米波频率范围内，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漩涡特性。本文采用有限差分时域（FDTD）方法进行三维数值模拟，研究了磁化等离子体中圆柱波纹波导混合模式毫米波涡旋的传播特性。研究发现，即使在法向平面波处于截止状态的条件下，混合模式的毫米波涡旋也能在磁化等离子体中传播，而且等离子体中的传播功率与拓扑电荷 l 高度相关。

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来源期刊

Japanese Journal of Applied Physics 物理-物理：应用

CiteScore

3.00

自引率

26.70%

发文量

818

审稿时长

3.5 months

期刊介绍： The Japanese Journal of Applied Physics (JJAP) is an international journal for the advancement and dissemination of knowledge in all fields of applied physics. JJAP is a sister journal of the Applied Physics Express (APEX) and is published by IOP Publishing Ltd on behalf of the Japan Society of Applied Physics (JSAP). JJAP publishes articles that significantly contribute to the advancements in the applications of physical principles as well as in the understanding of physics in view of particular applications in mind. Subjects covered by JJAP include the following fields: • Semiconductors, dielectrics, and organic materials • Photonics, quantum electronics, optics, and spectroscopy • Spintronics, superconductivity, and strongly correlated materials • Device physics including quantum information processing • Physics-based circuits and systems • Nanoscale science and technology • Crystal growth, surfaces, interfaces, thin films, and bulk materials • Plasmas, applied atomic and molecular physics, and applied nuclear physics • Device processing, fabrication and measurement technologies, and instrumentation • Cross-disciplinary areas such as bioelectronics/photonics, biosensing, environmental/energy technologies, and MEMS