Study of propagation mechanisms of external resonant magnetic perturbations by measurement of plasma flow profile in the small tokamak device.

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K03796
• 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: Ishikawa National College of Technology
• Principal Investigator: Okamoto Masaaki 石川工業高等専門学校, 電気工学科, 准教授 (60508290)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: トカマク / MHD / RMP / プローブ計測 / プラズマ流

Outline of Final Research Achievements

In tokamak fusion reactors, various studies have been conducted with the expectation that the resonant magnetic perturbation (RMP) field will maintain plasma stability. The purpose of this study is to quantitatively evaluate the effect of plasma flow on RMP propagation by comparing the results with theoretical calculations. Experimental results confirm RMP penetration when plasma and RMP rotation directions are the same, and comparison of discharge data with similar electron temperature and poloidal rotation velocity distributions shows that RMP penetration depends on RMP rotation velocity, with similar results obtained from theoretical calculations.

Free Research Field

核融合プラズマ

Academic Significance and Societal Importance of the Research Achievements

小型装置を用いることでプラズマ内部に計測器を挿入し、各種物理量の直接計測ができるため、RMP伝搬のキーパラメータである磁場揺動分布とプラズマ流速、温度、密度を計測し、その応答と理論モデルに基づく因果関係を直接比較できる点が学術的意義として挙げられる。理論モデルの検証を通して、汎用的なモデルの確立まで期待されるので、ITERや原型炉でのRMPを用いたELMやMHD制御の有用性を検証し、実用炉への実現に貢献できることが社会的意義として挙げられる