Study on dynamic behavior of recombination front and its control in detached plasma

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K14686
• 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 Institute for Fusion Science
• Principal Investigator: HAYASHI Yuki 核融合科学研究所, ヘリカル研究部, 助教 (00823387)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 非接触プラズマ / 再結合フロント / 熱パルス / 直線型装置 / リサイクリング / 流体コード / 体積再結合

Outline of Final Research Achievements

The interaction between a detached plasma, which is considered to be a promising method to reduce the heat load into the plasma facing wall in a fusion reactor, and a transient pulsed plasma due to instabilities has been studied through experiments using the linear plasma device Magnum-PSI and the modeling using 2D plasma fluid simulation. It was concluded that last-part of the pulsed plama was suppressed by the enhancement of the recycled neutral particle flux generated at the target because the first half of the pulse was observed as the target current.

Free Research Field

核融合学

Academic Significance and Societal Importance of the Research Achievements

熱核融合発電の実現に向けて、炉心からの過渡的な熱粒子放出現象に伴う炉壁への熱負荷を低減することが必須である。本研究では、パルスプラズマ自身が発生させるリサイクリング粒子束が後続のパルスを減衰させる現象を見出した。この現象を利用・発展させることで、非接触プラズマを用いた過渡的熱負荷の緩和手法を確立させ、熱核融合発電の早期実現に貢献できると考えられる。