2022 Fiscal Year Final Research Report
Compatibility between stable divertor detachment and core plasma performance with 3D edge magnetic field structure change
Project/Area Number |
19H01878
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 14020:Nuclear fusion-related
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Research Institution | National Institute for Fusion Science |
Principal Investigator |
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Project Period (FY) |
2019-04-01 – 2023-03-31
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Keywords | 3次元磁場効果 / 熱的不安定性 / プラズマ放射冷却 / 乱流伝播 / 輸送障壁 |
Outline of Final Research Achievements |
In a toroidal plasma confinement system for a fusion reactor, it has been found that a magnetic field structure called a "magnetic island" at the periphery enhances radiative cooling with the multi-charged ions in the plasma and reduces the heat load on the device wall, and that a transport barrier is formed at the boundary between the magnetic island and the confinement region, which improves the performance of plasma confinement. This phenomenon is more pronounced in deuterium plasmas than in hydrogen plasmas. In addition, significant progress has been made in the physical understanding of the impact of magnetic islands on the formation of radiating edge plasmas in terms of thermal instability. Furthermore, it was newly discovered that the turbulence excited at the transport barrier spreads and contributes to the reduction of the heat load on the device wall.
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Free Research Field |
プラズマ物理学
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Academic Significance and Societal Importance of the Research Achievements |
核融合発電を目指した環状プラズマ閉じ込め装置において、装置壁への過大な熱負荷の軽減と、閉じ込めプラズマ性能の両立は最重要課題の一つである。本研究の成果により、周辺磁場構造を最適化することによって、装置壁への熱負荷を軽減しつつ、高閉じ込め性能を維持できる可能性が見出された。さらに、乱流伝播による装置壁熱負荷軽減の発見は、従来の多荷イオンからの放射に替わる新たな熱負荷軽減手法として期待できる。 熱的不安定性の成長における磁場構造・トポロジーの役割に関する理解が進展した。本成果は、同様な不安定性を有する他の物理学分野(星間プラズマなど)の進展にも大きく寄与する。
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