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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Project Status |
Completed (Fiscal Year 2022)
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Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2019: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
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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 / 3次元磁場構造 / 3次元磁場トポロジー / ダイバータ / デタッチメント / コアプラズマ / ヘリカル型装置 / トカマク型装置 / ダイバータ熱負荷 / 放射冷却 / コアプラズマ性能 |
Outline of Research at the Start |
核融合炉におけるダイバータ熱負荷軽減とコアプラズマの閉じ込め性能の両立は極めて重要な研究課題である。一方、さらなるダイバータ熱負荷軽減を目指して提案されている摂動磁場(RMP)を用いた先進的ダイバータ配位においては、この点に着目した研究がまだほとんどなされていない。申請者らはこれまで、RMPを印加することによりデタッチメント運転が安定に維持できることを示してきた。その中で、RMPの印加によってコアの閉じ込め特性が変化することを見出した。これらの新たな発見を足掛かりにして、核融合炉における周辺部の3次元磁場形状がデタッチメント時のコアプラズマ閉じ込め性能に及ぼす影響について明らかにする。
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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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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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Report
(5 results)
Research Products
(67 results)
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[Journal Article] Confinement improvement during detached phase with RMP application in deuterium plasmas of LHD2022
Author(s)
M. Kobayashi, R. Seki, Y. Hayashi, T. Oishi, K. Tanaka, Y. Takemura, K. Ida, T. Kinoshita, K. Mukai, S. Morita, S. Masuzaki
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Journal Title
Nuclear Fusion
Volume: 62
Issue: 5
Pages: 056006-056006
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Recent results from deuterium experiments on the large helical device and their contribution to fusion reactor development2022
Author(s)
Masaki Osakabe, Hiromi Takahashi, Hiroshi Yamada, Kenji Tanaka, Tatsuya Kobayashi, Katsumi Ida, Satoshi Ohdachi, Jacobo Varela, Kunihiro Ogawa, Masahiro Kobayashi, Katsuyoshi Tsumori, Katsunori Ikeda, Suguru Masuzaki, et al
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Journal Title
Nuclear Fusion
Volume: 62
Issue: 4
Pages: 042019-042019
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Detachment control with feedback impurity seeding and ECRH injection in LHD2022
Author(s)
M. Kobayashi, Y. Mizuno, K. Nagahara, T. Tsujimura, K. Mukai, Y. Yoshimura, Y. Hayashi, T. Oishi, C. Suzuki, N. Kenmochi, S. Masuzaki, B.J. Peterson
Organizer
48th EPS Conference on Plasma Physics
Related Report
Int'l Joint Research
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[Presentation] High radiation fraction detachment with Ne seeding and an edge magnetic island in a new magnetic configuration in LHD2022
Author(s)
M. Kobayashi, T. Oishi, Y. Hayashi, K. Mukai, H. Takahashi, K. Tanaka, T. Kinoshita, M.Z. Tokar, B.J. Peterson, S. Masuzaki, H. Nakamura
Organizer
第39回プラズマ・核融合学会年会
Related Report
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[Presentation] Compatibility of core plasma performance and radiating edge plasma with 3D edge magnetic field structure change induced by RMP application in LHD2021
Author(s)
M. Kobayashi, K. Tanaka, K. Ida, R. Seki, T. Oishi, Y. Hayashi, Y. Takemura, M.Z. Tokar, S. Morita, M. Osakabe, K. Mukai, S. Masuzaki, Y. Narushima
Organizer
47th European Conference on Plasma Physics
Related Report
Int'l Joint Research / Invited
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[Presentation] Divertor detachment and core plasma transport with RMP application in LHD2021
Author(s)
M. Kobayashi, K. Tanaka, K. Ida, R. Seki, T. Oishi, Y. Hayashi, Y. Takemura, M.Z. Tokar, S. Morita, M. Osakabe, K. Mukai, S. Masuzaki, Y. Narushima
Organizer
5th Asia-Pacific Conference on Plasma Physics
Related Report
Int'l Joint Research / Invited
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[Presentation] Impact of 3D edge magnetic field structure/topology on thermal instability and core plasma confinement in toroidal magnetic confinement system2021
Author(s)
M. Kobayashi, R. Seki, Y. Hayashi, T. Oishi, K. Tanaka, Y. Takemura, M.Z. Tokar, K. Ida, T. Kinoshita, K. Mukai, S. Morita, S. Masuzaki
Organizer
第38回プラズマ・核融合学会年会
Related Report
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[Presentation] Divertor operation scenarios in helical devices2021
Author(s)
R. Koenig, S. Masuzaki, M. Kobayashi, K. Mukai, G. Motojima, T. Oishi, Y. Hayashi, G. Kawamura, T. Morisaki, S. Brezinsek, F. Effenberg, Y. Feng, M. Jakubowski, T. Kremeyer, M. Krychowiak, V. Perseo, F. Reimold, M. Otte, O. Schmitz, T Sunn Pedersen, T. Wauters, U. Wenzel, V. Winters and the W7-X and LHD teams
Organizer
International Conference on Plasma Surface Interaction
Related Report
Int'l Joint Research / Invited
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[Presentation] Ro-vibrational Population Distribution in the Ground State of Hydrogen Molecule Isotope in LHD Peripheral Plasmas Deduced from Emission Spectroscopy2020
Author(s)
Arseniy KUZMIN, Hiroki ISHIHARA, Masahiro KOBAYASHI1, Taiichi SHIKAMA, Keiji SAWADA, Seiki,SAITO, Hiroaki NAKAMURA, Keisuke FUJII, Masahiro HASUO, and the LHD Experiment Group
Organizer
International Toki Conference 29
Related Report
Int'l Joint Research
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[Presentation] FUEL SPECIES EFFECTS ON IMPURITY RADIATION AND ENERGY CONFINEMENT TIME IN DETACHMENT DISCHARGES WITH RMP APPLICATION IN LHD2019
Author(s)
M. Kobayashi, S. Morita, T. Oishi, Y. Takemura, Y. Hayashi, I. Yamada, S. Masuzaki, Y. Narushima, K. Mukai, R. Seki, T. Tokuzawa, K. Tanaka, and the LHD experimental group
Organizer
22nd International Stellarator and Heliotron workshop
Related Report
Int'l Joint Research
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[Presentation] Advantage and disadvantage of LHD heliotron divertor2019
Author(s)
M. Kobayashi, T. Goto, Y. Hayashi, G. Kawamura, G. Motojima, S. Morita, K. Mukai, S. Masuzaki, T. Oishi, C. Suzuki, T. Morisaki, and the LHD experimental group
Organizer
Third Technical Meeting on Divertor Concepts
Related Report
Int'l Joint Research / Invited
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[Presentation] Radiative divertor experiments with Ne, N, and Kr seeding in LHD2019
Author(s)
Kiyofumi Mukai, Suguru Masuzaki, Yuki Hayashi, Chihiro Suzuki, Tetsutaro Oishi, Masahiro Kobayashi, Hirohiko Tanaka, Byron J. Peterson, and the LHD Experiment Group
Organizer
Third Technical Meeting on Divertor Concepts
Related Report
Int'l Joint Research
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