| Project/Area Number |
17K06992
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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 |
MAEKAWA Takashi 京都大学, エネルギー科学研究科, 名誉教授 (20127137)
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| Co-Investigator(Kenkyū-buntansha) |
田中 仁 京都大学, エネルギー科学研究科, 教授 (90183863)
打田 正樹 京都大学, エネルギー科学研究科, 准教授 (90322164)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
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| Keywords | ECH/ECCD / トカマク / 非誘導立ち上げ / 電子サイクロトロン加熱・電流駆動 / トカマク炉 / 非誘導起動 |
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| Outline of Final Research Achievements |
Non-inductive buildup of a hot plasma using Electron Cyclotron Heating and Current Drive is theoretically proposed. There are two wave injection methods. The first is oblique X-wave injection referred to as DX method. For the low density start-up plasma, the wave damps away via cyclotron resonance absorption before encountering the cyclotron cutoff layer when the electron temperature is Te>100eV and realize an efficiency ECCD. Another is oblique O-wave injection, referred to as OX method. The waves pass through the EC resonance layer and are mode-converted into oblique X-waves upon reflection on the inboard wall. Then the X-waves propagate toward the ECR layer and cyclotron-damp away even when Te is very low. The OX method is appropriate for the initial stage of the build-up discharge where Te is low, while the DX method is appropriate for latter half of the discharge where Te >100eV. The analyses show that the plasma with130kA and 1keV is realized by 4MW of wave power.
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| Academic Significance and Societal Importance of the Research Achievements |
トカマク炉においてはプラズマ電流Ipの起動と立ち上げが不可欠である。電子サイクロトロン(EC)加熱・電流駆動により非誘導的にIp～100kAまで立ち上げ、1千万度（～1keV）の電子温度を得れば、抵抗が大幅に下がり、その後、低い一周誘導電圧VLでIpを燃焼プラズマ保持に必要な値まで立ち上げ得る。すなわち、VLをIpの起動のために高める必要が無くなり、中心ソレノイド（CS）を取り巻く炉中心部の設計、およびCS駆動電源の諸条件を緩和できる。本研究成果はトカマク炉の性能を高め（学術的意義）、加えて、トカマク炉の初期建設経費の低減に資する（社会的意義）。
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