2023 Fiscal Year Final Research Report
Coupling of neutral sound waves and electrostatic plasma waves in partially ionized plasma
| Project/Area Number |
21K03501
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 14010:Fundamental plasma-related
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| Research Institution | Sojo University (2023)
Kyushu University (2021-2022) |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 部分電離プラズマ / 中性粒子 / 静電イオンサイクロトロン波 / レーザー誘起蛍光ドップラー分光法 / ECRプラズマ |
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| Outline of Final Research Achievements |
The effect of the dynamics of neutral particles in a partially ionized plasma on the characteristics of wave propagation was studied. A dispersion relation of electrostatic ion cyclotron (EIC) waves was derived, and the propagation properties were numerically investigated. It was revealed that EIC waves can propagate below the ion cyclotron frequency due to the motion of neutral particles in the wave field. Experiments were conducted using the HYPER-II device to clarify the neutral gas effect on the EIC waves. Electrostatic waves propagating perpendicular to the magnetic field in a weakly ionized plasma were observed. A time-resolved laser-induced fluorescence spectroscopy system was constructed to measure the velocity distribution function of neutral particles. Furthermore, we proposed a new method that will contribute to developing laser spectroscopy techniques.
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| Free Research Field |
プラズマ科学
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| Academic Significance and Societal Importance of the Research Achievements |
部分電離プラズマは産業応用や地球磁気圏など我々の生活圏において非常に身近なものである．本研究は波動現象を中心とした部分電離プラズマの物理的性質を理解することに焦点を当てているが，本研究で得られた知見は広い分野にとって有益な情報を提供するものであると考えられる．また，本研究の一環として開発した高精度なレーザー分光システムは，プラズマを乱さず高精度に中性粒子やイオンの速度分布関数が計測できるため，産業応用分野への応用が期待される．
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