Optimum injection of electron cyclotron heating
| Project/Area Number |
16K18338
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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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 |
Tsujimura Toru 核融合科学研究所, ヘリカル研究部, 助教 (00732744)
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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 |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 核融合プラズマ / 電子サイクロトロン加熱 / プラズマ加熱 / 大型ヘリカル装置 / リアルタイム制御 / 偏波 / デポジション位置 / ミリ波 / プラズマ・核融合 |
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| Outline of Final Research Achievements |
Optimum injection of electron cyclotron heating (ECH) was conducted in LHD (Large Helical Device) plasmas. Maximizing the single-pass absorption power is a key for localized heating and improving its controllability. We found that peripheral plasmas outside the last closed flux surface of the LHD affect optimization of ECH, then developed the ray-tracing code which includes those effects, and finally improved the heating efficiency. The real-time control system of the ECH injection settings was developed with FPGA (Field Programmable Gate Array), based on the dependence of the optimum ECH settings on peripheral plasmas. We demonstrated to improve the single-pass absorption efficiency by controlling the incident polarization and the deposition locations of the EC waves in real time.
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| Academic Significance and Societal Importance of the Research Achievements |
学術的意義は、電磁波と電子との相互作用を評価する数値計算モデルを基にしたECH入射系のリアルタイム制御により、ECHの一回通過吸収効率を向上することが可能となったことである。これにより核融合プラズマの高性能化だけでなく、高パワー加熱による炉内機器の損傷防止にもつながる結果となった。社会的意義は、核融合炉の早期実現に向けて、プラズマの加熱性能に優れたECHの炉への適用の妥当性・実現性の向上につながることである。
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Report
(4 results)
Research Products
(15 results)
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[Presentation] Real-time control of ECRH polarization in LHD2018
Author(s)
T. I. Tsujimura, Y. Mizuno, T. Tokuzawa, Y. Ito, S. Kubo, T. Shimozuma, Y. Yoshimura, H. Igami, H. Takahashi, A. Ejiri
Organizer
2018 US-EU-Japan RF Heating Technology Workshop / US-Japan Workshop on RF Heating Physics
Related Report
Int'l Joint Research
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[Presentation] Real-time control of EC wave polarization in the LHD2018
Author(s)
T. I. Tsujimura, Y. Mizuno, T. Tokuzawa, Y. Ito, S. Kubo, T. Shimozuma, Y. Yoshimura, H. Igami, H. Takahashi, A. Ejiri, the LHD Experiment Group
Organizer
Japan-Korea Workshop on "Physics and Technology of Heating and Current Drive in Fusion Plasmas"
Related Report
Int'l Joint Research
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[Presentation] Impact of the LHD Peripheral Region and the Magnetic Axis Shift on Optimal On-Axis ECRH Injection for High-Electron-Temperature Plasmas2016
Author(s)
T. I. Tsujimura, S. Kubo, H. Igami, R. Makino, H. Takahashi, T. Shimozuma, Y. Yoshimura, R. Seki, M. Yokoyama, M. Osakabe, T. Mutoh
Organizer
26th IAEA Fusion Energy Conference
Place of Presentation
国立京都国際会館（京都府京都市）
Year and Date
2016-10-17
Related Report
Int'l Joint Research
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