FDTD Simulation of O-X Mode Conversion Process in Non-uniform Magnetized Plasma
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914434341928960 |
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| author | Wang, Chenxu Usui, Ryota Nakamura, Hiroaki Kawaguchi, Hideki Shin, Kubo |
| author_facet | Wang, Chenxu Usui, Ryota Nakamura, Hiroaki Kawaguchi, Hideki Shin, Kubo |
| contents | Electron Bernstein Waves (EBWs) are electrostatic waves than can propagate in overdense plasmas without density cutoff, making them suitable for high density plasma heating. Since EBWs cannot be directly launched from vacuum, mode conversion processes such as O-X-B conversion are required. In this study, the O-X mode conversion process is investigated using the finite difference time-domain (FDTD) method in a magnetized plasma with non-uniform density. In particular, the dependence of mode conversion characteristics on the incident angle of the injected wave is studied. The results show that an optimal incident angle exists at which the wave propagates without significant attenuation and strong electric field enhancement is observed near the upper hybrid resonance (UHR) layer. When the incident angle deviates from this optimal angle, an evanescent region appears, resulting in attenuation of the wave. These results demonstrate that angular optimization is essential for efficient wave propagation toward the UHR region and EBW excitation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_29513 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | FDTD Simulation of O-X Mode Conversion Process in Non-uniform Magnetized Plasma Wang, Chenxu Usui, Ryota Nakamura, Hiroaki Kawaguchi, Hideki Shin, Kubo Plasma Physics Electron Bernstein Waves (EBWs) are electrostatic waves than can propagate in overdense plasmas without density cutoff, making them suitable for high density plasma heating. Since EBWs cannot be directly launched from vacuum, mode conversion processes such as O-X-B conversion are required. In this study, the O-X mode conversion process is investigated using the finite difference time-domain (FDTD) method in a magnetized plasma with non-uniform density. In particular, the dependence of mode conversion characteristics on the incident angle of the injected wave is studied. The results show that an optimal incident angle exists at which the wave propagates without significant attenuation and strong electric field enhancement is observed near the upper hybrid resonance (UHR) layer. When the incident angle deviates from this optimal angle, an evanescent region appears, resulting in attenuation of the wave. These results demonstrate that angular optimization is essential for efficient wave propagation toward the UHR region and EBW excitation. |
| title | FDTD Simulation of O-X Mode Conversion Process in Non-uniform Magnetized Plasma |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2603.29513 |