Study on the instability of the high-performance plasma with strong reversed shear
| Project/Area Number |
17K07003
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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 | National Institutes for Quantum Science and Technology |
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Principal Investigator |
Takechi Manabu 国立研究開発法人量子科学技術研究開発機構, 那珂研究所 トカマクシステム技術開発部, 上席研究員 (40370423)
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| Co-Investigator(Kenkyū-buntansha) |
井上 静雄 国立研究開発法人量子科学技術研究開発機構, 那珂研究所 先進プラズマ研究部, 主任研究員 (80757956)
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| Project Period (FY) |
2017-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | 核融合プラズマ / 磁気流体不安定性 / 負磁気シアプラズマ / ディスラプション / 内部輸送障壁 / トカマク / 炉心プラズマ / MHD不安定性 |
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| Outline of Final Research Achievements |
The high-performance plasma with strong reversed shear has a very high confinement and achieved a world record value of equivalent fusion multiplication factor. It also has large advantage to steady-state plasma operation because it has large self-generated current fraction. It contributes to the size reduction of the device and can accel the realization of a fusion power plant. However it isn’t consider as the main scenario of the future fusion DEMO and the plant because, even in the low beta regime, it has a frequent small disruption and finally terminated by major disruption. In this research, the cause of these low-beta disruptions were studied and some of them were identified.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究により、負磁気シアプラズマの多くの崩壊の原因となる不安定性の同定が可能となった。強負磁気シアプラズマが将来の炉において適用可能となることは炉設計に対して大きなインパクトを与える。喫緊ではHモードのELMによるダイバータへの過大な熱負荷が最大の問題となっているが、負磁気シアプラズマによる運転が可能であれば、ELMの無いLモードで炉が成立する可能性がある。また、自発電流が多い自己加熱プラズマが安定解をどこで持つのかは自明ではなく、電流ホールを持つような強負磁気シアプラズマになる可能性も否定できないが、この場合においても安定な放電が可能となることが期待される。
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Report
(7 results)
Research Products
(11 results)
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[Presentation] The physics of locked tearing mode stabilization by rotating 3D fields in the presence of static error fields2019
Author(s)
S. Inoue, M. Okabayashi, Z. Taylor, E.J. Strait, J. Shiraishi, G. Matsunaga, M. Takechi, A. Isayama, N. Hayashi, S. Ide
Organizer
61st Annual Meeting of the APS Division of Plasma Physics, FL, USA, Oct. (2019)
Related Report
Int'l Joint Research / Invited
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[Presentation] Critical Physical Process of Locked-Tearing Mode Control by 3D Magnetic Field Entrainment with Static Error Fields2019
Author(s)
M. Okabayashi, 井上 静雄, E. Strait, Z. Taylor, C. Paz-Soldan, J. de Grassie, N. Ferraro, J. Hanson, S. Jardin, R. La Haye, N. Logan
Organizer
27th IAEA Fusion Energy Conference
Related Report
Int'l Joint Research
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