| Project/Area Number |
15K06645
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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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| Research Field |
Nuclear fusion studies
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| Research Institution | Kyoto University |
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Principal Investigator |
Kobayashi Shinji 京都大学, エネルギー理工学研究所, 助教 (70346055)
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| Co-Investigator(Renkei-kenkyūsha) |
Kado Shin-ichiro 京都大学, エネルギー理工学研究所, 准教授 (10300732)
Oishi Tetsutaro 核融合科学研究所, 高密度プラズマ物理研究系, 助教 (80442523)
Ohshima Shinsuke 京都大学, エネルギー理工学研究所, 助教 (00469610)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | ビーム放射分光 / 密度揺動 / ヘリカルプラズマ / H-mode遷移 / 前駆振動 / ビーム放射分光法 / 2次元密度揺動分布 / 乱流揺動 / アバランシェフォトダイオード |
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| Outline of Final Research Achievements |
In this research, 2-dimensional (2D) density fluctuation measurement system using beam emission spectroscopy (BES) has been prepared to obtain MHD and high-frequency turbulent fluctuations. Especially, target of this research is to clarify the oscillations obtained before H-mode transition triggered by high-intensity gas puffing in Heliotron J. The frequency-wavenumber vector has been obtained by the preparation of the 2D-BES system. By applying envelope analysis to the high-frequency density fluctuation observed before the H-mode transition, a clear correlation between the high-frequency fluctuation and the low frequency density fluctuation corresponding to the particle exhaust phenomena has been found. One candidate to explain the phenomena is non-linear coupling between the two fluctuations.
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