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Effects of a coherent mode on the redistribution of divertor particle flux in HL-2A H-mode plasmas

N Wu, J Cheng, L W Yan, Z H Huang, J Q Xu, W C Wang, R Ke, Z C Yang, X Q Ji, L Liu2021年Plasma Physics and Controlled FusionIF 2.2出版社

The effects of a coherent mode (CM) at a frequency of f = 13–16 kHz on the redistribution of divertor particle flux have been studied in HL-2A H-mode plasmas using multiple diagnostics. The experimental results demonstrate that a CM localized at the middle of the pedestal results in outward particle transport, limiting the growth of the pedestal density gradient in the recovery phase of the pedestal, leading to a substantial increase in the localized particle flux striking the outer divertor target, which clearly deviates from the primary peak at the strike point. These observations indicate that the CM might play a crucial role in redistributing the divertor particle flux, which is important for understanding and controlling the divertor heat flux in future fusion-relevant devices.

日本語訳

周波数f = 13–16 kHzのコヒーレントモード(CM)がダイバータ粒子束の再分布に及ぼす影響が、複数の診断装置を用いてHL-2A Hモードプラズマにおいて研究された。実験結果は、ペデスタル中央部に局在するCMが外向きの粒子輸送をもたらし、ペデスタル回復期におけるペデスタル密度勾配の成長を抑制し、その結果、外側ダイバータターゲットに到達する局所粒子束が大幅に増加し、これはストライク点における主要なピークから明確に逸脱することを実証している。これらの観測結果は、CMがダイバータ粒子束の再分布において重要な役割を果たす可能性を示唆しており、これは将来の核融合関連装置におけるダイバータ熱流束の理解と制御にとって重要である。

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