Investigation of ion confinement and its loss mechanism by the microwave collective Thomson scattering
| Project/Area Number |
16H04620
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
Tanaka Kenji 核融合科学研究所, ヘリカル研究部, 教授 (50260047)
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| Co-Investigator(Kenkyū-buntansha) |
西浦 正樹 東京大学, 大学院新領域創成科学研究科, 准教授 (60360616)
武村 勇輝 核融合科学研究所, ヘリカル研究部, 助教 (60705606)
久保 伸 核融合科学研究所, ヘリカル研究部, 教授 (80170025)
下妻 隆 核融合科学研究所, ヘリカル研究部, 教授 (80270487)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000)
Fiscal Year 2018: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2017: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 高速イオン / トムソン散乱 / 協同トムソン散乱 / 核融合反応 / ヘリカル / 磁気リップル / 中性粒子ビーム / 乱流揺動 / 乱流 / マイクロ波 / プラズマ / 核融合 / CO2レーザー / プラズマ・核融合 |
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| Outline of Final Research Achievements |
We have developed microwave collective Thomson scattering (CTS) and CO2 laser diagnostics for the understanding of fast ion confinement and its loss mechanism. For CTS, we tried 154GHz gyrotron, which is suitable for high density operation due to the weak refraction effects. We obtained fast ion signal at 1.375T but we could not obtain at 2.75T due to the strong electron cyclotron emission. For the investigation, higher field is preferable for the better fast ion confinement. Then we succeeded to get fast ion signal using 77GHz gyrotron CTS at 2.75T. We made comparison experiments at different magnetic configuration. Then, 77GHz CTS showed clear difference of fast ion signal. Stronger (weaker) fast ion signal was obtained at smaller (larger) magnetic ripple configuration. CO2 laser diagnostics were also prepared. The rapid reduction of the turbulence signal was found. This is due to transient formation of radial electric sharer due to the loss of fast ion.
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| Academic Significance and Societal Importance of the Research Achievements |
核融合反応で生成される高速イオンの閉じ込めの評価と、その損失機構の解明は核融合研究において重要である。核融合炉でも適用できる直接的な高速イオンの計測手法はマイクロ波を用いた協同散乱しかない。77GHzと154GHzの両者を用いることによりそれぞれの周波数における適用可能領域が明らかになった。高い周波数（154GHz）では信号強度が減少するとともに基本、または第二電子共鳴放射光が存在する場合、非常に強いノイズ源となり計測が困難になることが分かった。精度の良い高速イオン計測のためには、できるだけ低い周波数を用いて、屈折の効果を最小化する実験を行うのが適切であることが分かった。
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Report
(4 results)
Research Products
(50 results)
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[Journal Article] Collisionality dependence and ion species effects on heat transport in He and H plasma, and the role of ion scale turbulence in LHD2017
Author(s)
K. Tanaka, K. Nagaoka, S. Murakami, H. Takahashi1, M. Osakabe, M. Yokoyama, R. Seki, C.A. Michael, H. Yamaguchi, C. Suzuki, A. Shimizu, T. Tokuzawa, M. Yoshinuma, T. Akiyama, K. Ida, I. Yamada, R. Yasuhara, H. Funaba, T. Kobayashi, H. Yamada, LHD experimental group
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Journal Title
Nuclear Fusion
Volume: 57
Issue: 11
Pages: 116005-116005
DOI
NAID
Related Report
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[Journal Article] Role of Helium Hydrogen ratio on energetic interchange mode behaviour and its effect2017
Author(s)
C.A. Michael, K. Tanaka, T. Akiyama, T. Ozaki, M. Osakabe, S. Sakakibara, H. Yamaguchi, S. Murakami, M. Yokoyama, M. Shoji, L.N. Vyacheslavov, LHD
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Journal Title
Nuclear Fusion
Volume: 58
Issue: 4
Pages: 046013-046013
DOI
Related Report
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[Journal Article] Suppression of Trapped Energetic Ions driven Resistive Interchange Modes with Electron-Cyclotron-Heating in a Helical Plasm2017
Author(s)
X. D. Du, K. Toi, S. Ohdachi, K. Y. Watanabe, H. Takahashi, Y. Yoshimura, M. Osakabe, R. Seki, T. Nicolas, H. Tsuchiya, K. Nagaoka, K. Ogawa, K. Tanaka, M. Isobe, M. Yokoyama, M. Yoshinuma, S. Kubo, S. Sakakibara, T. Bando, T. Ido, T. Ozaki, Y. Suzuki, Y. Takemura, and LHD experiment Group
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Journal Title
Physical Review Letters
Volume: 118
Issue: 12
Pages: 125001-125001
DOI
Related Report
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[Presentation] Isotope effects on transport and turbulence in LHD2017
Author(s)
K. Tanaka, T. Ii. Tsujimura, S. Kubo, M. Nakata, Y. Ohtani, K. Nagaoka, M. Yokoyama, H. Takahashi, S. Murakami, R. Seki, S. Kamio, T. Tokuzawa, T. Akiyama, I. Yamada, R. Yasuhara, M. Yoshinuma, K. Ida, H. Yamada, M. Goto, A. Ishizawa, M. Nunami, H. Sugama, M. Osakabe, T. Morisaki1 and the LHD Experimental Group
Organizer
21st International Stellarator-Heliotron Workshop
Related Report
Int'l Joint Research
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[Presentation] Improvement of Millimeter-Wave Transmission Efficiency Using Beam Profile Monitors in an ECRH Transmission Lin2017
Author(s)
Takashi Shimozuma, Sakuji Kobayashi, Satoshi Ito, Yasuhiko Ito, Kohta Okada, Yasuo Yoshimura, Hiroe Igami, Hiromi Takahashi, Toru Tsujimura, Yoshinori Mizuno, Shin Kubo
Organizer
26th International Toki Conference
Related Report
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[Presentation] Current Status of the LHD ECRH System and Development of Dual-Frequency Gyrotrons2017
Author(s)
T. Shimozuma, S. Kubo, Y. Yoshimura, H. Igami, H. Takahashi, T. Tsujimura, R. Makino, S. Ito, Y. Mizuno, H. Takubo, S.
Organizer
2017 US-EU-JPN Workshop on RF Heating Technology & 2017 US-JPN Workshop on RF Physics
Related Report
Int'l Joint Research
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