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Results from an improved flowing liquid lithium limiter with increased flow uniformity in high power plasmas in EAST

G.Z. Zuo, J.S. Hu, R. Maingi, Z. Sun, Q.X. Yang, M. Huang, X.C. Meng, W. Xu, Y.Z. Qian, C.L. Li2019年被引用 35Nuclear FusionIF 3出版社

Significant engineering and physic progress was made by the upgrade of a flowing liquid lithium limiter (FLiLi) inserted into EAST H-mode discharges in 2016. The progress includes an improvement of liquid Li coverage uniformity, no macroscopic surface erosion by plasma materials interaction, effective removal of 55% of the discharge heat flux using high pressure He cooling during ohmic discharges, and the demonstrated ability to restart Li flow for a second experiment performed a week after the first. With increasing Li flow rate, fuel particle recycling and Fe impurity radiation gradually decreased, and plasma performance slightly improved, but there was no impact on the edge tungsten influx. No obvious Li bursts appeared during operation with up to about 4.5 MW auxiliary heating power with peak heat flux reaching ~4 MW m−2 on FLiLi. In addition, a gradual mitigation of edge localized mode (ELM) activity was observed with FLiLi operation. Finally, short-lived ELM-free phases were observed for the first time in EAST during FLiLi insertion, with increasing τE and transient H98(y, 2)  <  2.

日本語訳

リチウム液体リミター(FLiLi)の改良により、2016年のEAST Hモード放電において大きな工学的・物理的進展が達成された。この進展には、リチウム被覆の均一性の向上、プラズマ・材料相互作用による巨視的損耗の不在、ヘリウム冷却によるオーミック放電中の熱流束の55%の効果的な除去、そして初回実験の1週間後に実施された2回目の実験でのリチウム流動再開の実証が含まれる。リチウム流量の増加に伴い、燃料粒子リサイクリングと鉄不純物放射は徐々に減少し、プラズマ性能はわずかに向上したが、周辺タングステン流入には影響が見られなかった。約4.5 MWの追加加热電力、FLiLi上のピーク熱流束が約4 MW m−2に達する条件下でも、リチウムのバーストは観測されなかった。さらに、FLiLi運転中に周辺局在モード(ELM)活動の緩やかな抑制が観測された。最後に、FLiLi挿入中に、エネルギー閉じ込め時間τの増加とともに、短寿命のELMフリー位相がEASTで初めて観測され、過渡H98(y,2) < 2が達成された。

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east高精度(タイトル一致)

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EASTLithiumLimiterLiquid lithium
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