2022 Fiscal Year Final Research Report
Effects of electron cyclotron wave propagation with orbital angular momentum on plasma heating
| Project/Area Number |
19K14687
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 14020:Nuclear fusion-related
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| Research Institution | Chubu University (2022)
National Institute for Fusion Science (2019-2021) |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 電子サイクロトロン波 / 磁化プラズマ / 光渦 / 軌道角運動量 / プラズマ加熱 / Berry曲率 / スパイラル位相ミラー / ミリ波伝送系 |
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| Outline of Final Research Achievements |
The purpose of this study was to elucidate how the orbital angular momentum of electromagnetic wave affects its propagation in an anisotropic medium, magnetized plasma, in electron cyclotron (EC) heating. The results obtained are as follows: (1) The Berry curvature increases divergently when the wavenumber goes to zero, so that in the case of the X-mode, the effect of transverse shift appears when the wave is reflected at the right-handed cutoff layer. (2) The effect of the spiral wavefront on the wavefield was found to be more pronounced when the vorticity of the EC waves on the spiral wavefront was larger and closer to the optical axis. (3) A spiral phase mirror was developed to generate EC waves with orbital angular momentum. (4) We constructed an optical vortex transmission system and demonstrated plasma generation, heating, and sustainment by vortex EC waves for the first time in the world.
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| Free Research Field |
核融合プラズマ
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| Academic Significance and Societal Importance of the Research Achievements |
学術的意義は、従来無視されてきた光の軌道角運動量がEC波の偏波と相互作用することで、異方的な誘電媒質である磁化プラズマ中の伝搬に与える影響が明らかにされてきたということである。
社会的意義は、高密度領域に伝搬可能と示唆される渦EC波によるプラズマ加熱の高効率化を理論的・実験的に検証していくことが核融合炉実現へ向けて貢献することである。
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