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Turbulence and flows in the plasma boundary of snowflake magnetic configurations

M. Giacomin, L.N. Stenger, P. Ricci2020年被引用 24Nuclear FusionIF 3出版社

Results of 3D, flux-driven, global, two-fluid turbulence simulations are presented for the first time in snowflake (SF) configurations, including the ideal SF, SF plus and SF minus configurations. The analysis is focused on the distribution of the heat flux along the four divertor legs in the sheath-limited regime and on the mechanisms that activate the four strike points. A steady equilibrium flow in the X-point region is found to play an important role for the activation of the four strike points, especially in the ideal SF case. Turbulent transport, observed in the region between the two separatrices for the SF minus configuration when the secondary X-point is on the low-field side, contributes to the redistribution of heat flux among the strike points.

日本語訳

3次元・フラックス駆動・二流体乱流シミュレーションの結果を、スノーフレーク(SF)配位において初めて提示する。これには、理想SF、SFプラス、SFマイナスの各配位が含まれる。解析は、シース制限領域における4つのダイバータ脚に沿った熱流束の分布と、4つのストライク点を活性化するメカニズムに焦点を当てている。X点領域における定常平衡流が、特に理想SF配位において、4つのストライク点の活性化に重要な役割を果たすことが見出された。SFマイナス配位において、二次X点が低磁場側にある場合、2つのセパラトリクス間の領域で観測される乱流輸送が、ストライク点間の熱流束の再分配に寄与することが示された。

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