2023 Fiscal Year Final Research Report
Interaction between high-energy electron and whistler wave in tokamak plasma
| Project/Area Number |
21K03511
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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 14020:Nuclear fusion-related
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| Research Institution | Kyushu University |
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Principal Investigator |
Ikezoe Ryuya 九州大学, 応用力学研究所, 准教授 (70582849)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 高エネルギー電子 / 硬X線 / 荷電粒子計測 / 高周波モード / 波動粒子相互作用 / 電子サイクロトロン加熱 / ピッチ角散乱 / 位相空間 |
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| Outline of Final Research Achievements |
An excellent high-frequency wave measurement environment has been constructed on the QUEST spherical tokamak, where abundant high-energy electrons are generated through electron cyclotron heating, and the conditions and characteristics of high-frequency waves in the MHz band driven by high-energy electrons were investigated in detail. In addition, by developing a challenging high-energy particle probe, we succeeded in extracting phase-space information of high-energy electrons, which is important in plasma current start-up and runaway electron beam formation processes during disruption. Furthermore, as a by-product of ultra-high-speed measurement of high-intensity hard X-rays, it was discovered that the high-energy electron flux itself that emits hard X-rays fluctuates with the high-frequency waves, providing evidence for the existence of interactions between high-energy electrons and the waves they excite.
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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 |
トカマクプラズマにおける高エネルギー電子の位相空間情報を高精度に取得する手法が初めて開拓された．これにより磁気圏プラズマ研究とも課題を共有する波動粒子相互作用の非線形発展等の未解明物理に対し，今後実験室プラズマでの精緻な研究展開が期待できる．また，フュージョンエネルギー開発で注目される球状トカマク型コンパクト炉の実現に向けて，高エネルギー電子を活用した超高効率プラズマ電流立ち上げは非常に魅力的であり，その制御手法としての波動活用およびディスラプション対策として波動応用に向けた知見が得られた．
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