Development of plasma response simulation code against three-dimensional magnetic field in tokamaks

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K14696
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 14020:Nuclear fusion-related
• Research Institution: National Institutes for Quantum Science and Technology
• Principal Investigator: Inoue Shizuo 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)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 誤差磁場 / 磁気島

Outline of Final Research Achievements

This research objective is to explore locked modes, which is a major cause of plasma disruption in the tokamak devices and is caused by error fields that stem from the errors of the installation and construction of devices. The AEOLUS-IT code predict the plasma response against the error field, which is validated by the experiment in the DIII-D in US. The key result is the multi-hierarchy response between the external field and the internal magnetic island, which was reported in the IAEA Fusion Energy conference and is published in Nuclear Fusion Journal. Furthermore, we found the new stabilization scheme of the magnetic island by the external magnetic field by exiting the resonant oscillation of the magnetic island, which can be considered as energy cascade and was reported in the American Physics Conference.

Free Research Field

核融合学

Academic Significance and Societal Importance of the Research Achievements

プラズマはそれ自身の回転により誤差磁場を遮蔽するが、誤差磁場は装置壁に流れる渦電流やコイルの非軸対称により生じ、その遮へいはプラズマの非線形的な振る舞いにより生じる。本研究では遮蔽・浸透の多階層的な物理を明らかにするとともにトカマク型装置における誤差磁場の許容値緩和により原型炉の建設コスト削減に貢献しうる、新しいロックトモード回避手法を提案した。