Development of a new method for edge plasma control using scrape-off-laier in a toroidal plasma

2016 Fiscal Year Final Research Report

• Project/Area Number: 26630476
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Toi Kazuo 核融合科学研究所, その他部局等, 名誉教授 (20093057)
• Co-Investigator(Renkei-kenkyūsha): ZUSHI Hideki 九州大学, 応用力学研究所, 特命教授 (20127096) ; YAMAMOTO Satoshi 京都大学, エネルギー科学研究所, 助教 (70397529)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ダイバータ / スクレイプ・オフ層(SOL) / 周辺プラズマ / 電気的バイアス法 / SOL電流 / 共鳴ヘリカル磁場摂動

Outline of Final Research Achievements

Electric biasing of toroidally segmented divertor plates with adjusted phasing was applied to a small tokamak for active control of plasma in the scrape-off-layer(SOL) surrounding a confined core-plasma. Fourier decomposition of the observed SOL currents driven by the biasing indicates generation of resonant magnetic perturbations with specified toroidal mode number. Positive biasing is most effective for generation of RMPs because high SOL currents and the long length of the current paths are realized. This biasing also showed the radial expansion of particle flux to the divertor, reducing the local peak value. In conclusion, this new biasing method has high potentiality for effective control of divertor heat load.

Free Research Field

核融合プラズマ理工学