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Impurity transport in the pedestal of H-mode plasmas with resonant magnetic perturbations

B S Victor, T Odstrcil, C A Paz-Soldan, B A Grierson, E Hinson, A Jarvinen, E M Hollmann, C Chrystal, C S Collins, K E Thome2020年Plasma Physics and Controlled FusionIF 2.2出版社

Experiments on DIII-D show that resonant magnetic perturbations (RMPs) reduce the impurity confinement time in the H-mode pedestal below that of naturally ELMy plasmas. STRAHL modeling of discharges with aluminum laser blow off (LBO) injection show increased diffusion in the pedestal of H-mode discharges with RMPs. The increased diffusion from the RMPs provides improved impurity control compared to the naturally ELMy discharges and prevents the buildup of impurities near the edge of the plasma. Tungsten LBO injection into discharges with and without RMPs led to striking differences in the evolution of the discharge. The naturally ELMy discharge became ELM free and showed an increase in edge radiation, leading to the eventual radiative collapse of the plasma. Injecting a similar number of W particles into discharges with RMPs, either with or without ELMs, led to a measurable accumulation of core W but did not significantly impact the evolution of the discharge. These results indicate that RMPs are beneficial for controlling the buildup of impurities in the pedestal region of the plasma.

日本語訳

DIII-Dでの実験により、共鳴磁場摂動(RMP)は、自然ELMプラズマのそれよりも低いHモードペデスタルでの不純物閉じ込め時間を低減することが示された。アルミニウムレーザーブローオフ(LBO)注入を用いたSTRAHLモデリングは、RMPを伴うHモード放電のペデスタルにおける拡散の増加を示している。RMPによる拡散の増加は、自然ELM放電と比較して不純物制御の改善をもたらし、プラズマの端部近傍での不純物の蓄積を防ぐ。RMPの有無にかかわらず放電へのタングステンLBO注入は、放電の時間発展に顕著な違いをもたらした。自然ELM放電はELMフリーとなり、端部放射の増加を示し、最終的にプラズマの放射崩壊に至った。同様の数のW粒子をRMPを伴う放電(ELMの有無にかかわらず)に注入した場合、コアWの蓄積は測定可能であったが、放電の時間発展には有意な影響を及ぼさなかった。これらの結果は、RMPがプラズマのペデスタル領域における不純物の蓄積を制御するのに有益であることを示している。

装置

diii-d中精度(概要文一致)

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ImpurityH-modePedestalMagnetic perturbationResonant magnetic perturbationImpurity transport
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