Theoretical Research in Formation Mechanisms of Fuzzy Nano-structures by Comparison among Noble Gases and Metals
| Project/Area Number |
15H05563
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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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 |
Ito Atsushi M. 核融合科学研究所, ヘリカル研究部, 准教授 (10581051)
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥20,670,000 (Direct Cost: ¥15,900,000、Indirect Cost: ¥4,770,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2016: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2015: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
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| Keywords | プラズマ壁相互作用 / ヘリウムプラズマ / タングステン / 分子動力学 / ハイブリッドシミュレーション / 動的モンテカルロ法 / 二体衝突近似 / ナノ構造 / プラズマ・核融合 / ナノ材料 / プラズマ加工 / 計算物理 / 物性理論 / プラズマー壁相互作用 / Fuzz構造 / ダイバータ / シミュレーション / 数理物理 / プラズマ－壁相互作用 / ヘリウム / プラズマ－物質相互作用 |
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| Outline of Final Research Achievements |
We investigated the formation mechanism for "fuzz" which is a fuzzy nanostructure induced on the tungsten surface by helium plasma irradiation. We developed the BCA-MD-KMC triple hybrid method, the method to find automatically path of the impurity atom in material, the meta-compiler to generation the simulation code for potential model in molecular dynamics from mathematical expressions. Using these, we succeeded in reproducing the growth of fuzz by simulation. As a growth mechanism, it has come to discover an unexpected mechanism in which repeated sputtering and re-deposition phenomena cause transport of tungsten atoms after burst of helium bubbles.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究を通じて開発されたBCA-MD-KMCハイブリッド法は、原子レベルの計算のまま100秒までの照射現象をシミュレート可能にした画期的な手法であり、プラズマと固体物質の界面現象（プラズマ物質相互作用）に対して広く応用可能な手法である。産業界では半導体プロセスや薄膜コーティングに展開可能で、成功すれば飛躍的な製品開発の向上に繋がる可能性があり、現在は産学連携研究を展開中である。また、動的モンテカルロの経路探索法やメタコンパイラも、プラズマ・核融合分野以外での物質材料シミュレーションに広く展開可能なもので、今後の分野融合的発展が期待できる。
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Report
(5 results)
Research Products
(55 results)
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[Journal Article] Molecular dynamics and Monte Carlo hybrid simulation for fuzzy tungsten nanostructure formation2015
Author(s)
A.M. Ito, A. Takamyama, Y. Oda, T. Tamura, R. Kobayashi, T. Hattori, S. Ogata, N. Ohno, S. Kajita, M. Yajima, Y. Nojiri, Y. Yoshimoto, S. Saito, S. Takamura, T. Murashima, M. Miyamoto, H. Nakamura
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Journal Title
Nuclear Fusion
Volume: 55
Issue: 7
Pages: 073013-073013
DOI
Related Report
Peer Reviewed
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[Presentation] Fusion material simulation2015
Author(s)
A. M. Ito, T. Murashima, T. Tamura, R. Kobayashi, A. Takayama, S. Kajita, S. Takamura, N. Ohno, M. Yajima, Y. Yoshimoto, S. Ogata, S.Kato, and H. Nakamura
Organizer
Innovations and co-designs of fusion simulations towards extreme scale computing
Place of Presentation
Nagoya University, Nagoya, Japan
Year and Date
2015-08-20
Related Report
Int'l Joint Research
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[Presentation] Plasma-Material Interaction: Fuzzy Nanostructure Formation by Helium Plasma Irradiation2015
Author(s)
Atsushi M. Ito, Takahiro Murashima, Arimichi Takayama, Tomoyuki Tamura, Ryo Kobayashi, Shin Kajita, Shuichi Takamura, Noriyasu Ohno, Miyuki Yajima, Yoshihide Yoshimoto, Shuji Ogata, and Hiroaki Nakamura
Organizer
International workshop on Warm Dense Matter
Place of Presentation
Kurashiki, Japan
Year and Date
2015-06-08
Related Report
Int'l Joint Research / Invited
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[Presentation] Tungsten Fuzzy Nanostructure Growth by Molecular Dynamics and Monte-Carlo Hybrid Simulation2015
Author(s)
A. M. Ito, T. Murashima, T. Tamura, R. Kobayashi, A. Takayama, S. Kajita, s. Takamura, N. Ohno, M. Yajima, Y. Yoshimoto, S. Ogata, and H. Nakamura
Organizer
International Workshop on Models and Data for Plasma-Material Interaction in Fusion Devices 2015(MoD-PMI2015)
Place of Presentation
Marseille, France
Year and Date
2015-05-25
Related Report
Int'l Joint Research / Invited
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