Research on formation and sustainment mechanism of turbulent structures by using integrated turbulence diagnostic system in torus

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K03905
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 14020:Nuclear fusion-related
• Research Institution: Kyushu University
• Principal Investigator: Kasuya Naohiro 九州大学, 応用力学研究所, 教授 (20390635)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 乱流構造 / 磁場閉じ込め / トーラス / 数値診断 / 統合シミュレーション / プラズマ / 非線形相互作用

Outline of Final Research Achievements

Integrated turbulence diagnostic simulator has been developed for quantitative evaluation of plasma turbulence phenomena, because the 3-D spatial competition and multi-scale nonlinear mechanism of turbulent structures play important roles in magnetic confinement fusion plasmas. The system uses 3-D plasma simulation data to analyze physical mechanisms by simulating turbulence diagnostics in actual experimental devices. The system has been extended to support various types of fluctuation diagnostics in laboratory and large fusion device plasmas through object-oriented programming. Nonlinear processes are clarified by analyzing competition of 3-D torus plasma instabilities and particle transport induced by turbulence.

Free Research Field

プラズマ科学

Academic Significance and Societal Importance of the Research Achievements

磁場閉じ込め核融合プラズマは乱流状態にあり、その理解が高温・高密度プラズマの性能向上につながる。局所的な揺らぎだけでなく、装置サイズに及ぶ大域的な揺らぎも存在し役割解明が望まれている。本研究では乱流の局所・大域を含む全体構造をシミュレーションで提示し、解析するシステムを構築したもので、物理機構の解明に貢献する。さらに、シミュレーション空間内で実空間を再現したデジタルツイン上の解析ツールとして、実際のプラズマ現象理解への橋渡しの役割を果たす。