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Theoretical studies and simulations of mode structure symmetry breaking in tokamak plasmas in the presence of energetic particles

Z X Lu, X Wang, Ph Lauber, E Fable, A Bottino, W Hornsby, T Hayward-Schneider, F Zonca, C Angioni2019年Plasma Physics and Controlled FusionIF 2.2出版社

The mode structure symmetry breaking is important for the understanding of the momentum transport induced by micro turbulence and the experimental observation of Alfvénic mode structures driven by energetic particles (EPs) as well as the burning plasma behavior. In this work, the theoretical approach for the analyzes of the global mode structure in the presence of EPs is introduced with various applications. As a brief review of our previous work, the calculation of strongly coupled poloidal harmonics, with a complex 'tilting angle' applied, and the calculation of weakly coupled poloidal harmonics, with EPs' non-perturbative effects taken into account, are introduced. By making use of the theoretical approach, several applications related to the mode structure symmetry breaking are demonstrated. The anisotropic EP impact on the zonal flow residual is calculated. The mode structure symmetry breaking of the EP induced geodesic acoustic mode is studied. The momentum transport related to the mode structure symmetry breaking is estimated. The particle and energy transport is also analyzed and its comparison with the turbulence induced transport is discussed.

日本語訳

モード構造対称性の破れは、微視的乱流によって誘起される運動量輸送と、高エネルギー粒子(EPs)によって駆動されるアルヴェン性モード構造の実験的観測、ならびに燃焼プラズマ挙動の理解にとって重要である。本稿では、EPsの存在下でのグローバルモード構造の解析に対する理論的アプローチを、様々な応用とともに紹介する。我々の先行研究の簡潔なレビューとして、複素「傾斜角」を適用した強結合ポロイダル高調波の計算と、EPsの非摂動効果を考慮した弱結合ポロイダル高調波の計算を紹介する。この理論的アプローチを利用して、モード構造対称性の破れに関連するいくつかの応用を実証する。帯状流残差に対する異方性EPの影響を計算する。EP誘起測地線音響モードのモード構造対称性の破れを研究する。モード構造対称性の破れに関連する運動量輸送を評価する。粒子輸送およびエネルギー輸送も解析し、乱流誘起輸送との比較について議論する。

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Energetic particles
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