本研究では核融合周辺プラズマを対象として新しい運動論的数値シミュレーションモデルの構築を試みた。とくにELM(Edge Localized Mode)時の電子エネルギー分布関数の非平衡性・非定常性を考慮し, デタッチメントプラズマおよび水素原子・分子反応過程の動的モデリングを行った。ELM時には, 分子活性化再結合(MAR)に重要な振動励起分子の生成が効果的に行われ, その結果, ELM通過後, MARの反応レート増大の可能性が示された。また, ELM前後ではコアプラズマ周辺部に急峻な密度・温度勾配が存在し, 新古典輸送効果が重要となる。この効果を考慮した新しい運動論的不純物輸送モデルの開発にも成功した。
The final goal of this study is to develop a new kinetic simulation tool of plasmas, neutrals, and impurities in fusion edge plasmas. Taking into account the non-equilibrium and non-steady characteristics of electron energy distribution function (EEDF), we have done a dynamic simulation of the ELM (Edge Localized Mode). The effect of the ELM on the plasma detachment has been studied. Especially. the effects of the ELM on the MAR (Molecular Activated Recombination) has been analyzed. The results show that the vibrational excited molecules, which play a key for MAR, are effectively produced during the ELM heat pulse. Due to this enhancement, MAR rate is possibly enhanced after the ELM pulse. In addition, a new kinetic impurity transport model has been successfully developed. The model includes neo-classical transport effects of impurities, which becomes important under the steep density/temperature gradient in the core pedestal region before and after the ELM pulse.

研究種目 : 基盤研究(B)(一般)
研究期間 : 2015～2017
課題番号 : 15H04232
研究分野 : プラズマ物理