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

Zuo, G. Z.; Hu, J. S.; Maingi, R.; Sun, Z.; Yang, Q. X.; Huang, M.; Meng, X. C.; Xu, W.; Qian, Y. Z.; Li, C. L.; Bi, H. L.; Chen, Y.; Yuan, X. L.; Han, X. F.; Zhu, X.; Wang, Y. F.; Zhang, L.; Liu, H. Q.; Wang, L.; Gong, X. Z.; Tritz, K.; Diallo, A.; Lunsford, R.; Ni, M. J.; Li, J. G.

doi:10.1088/1741-4326/aaedcb

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

Journal Article · 26 November 2018 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/aaedcb · OSTI ID:1512785

Zuo, G. Z. ^[1]; Hu, J. S. ^[2]; Maingi, R. ^[3];

^[4]; Yang, Q. X. ^[1]; Huang, M. ^[1]; Meng, X. C. ^[5]; Xu, W. ^[5]; Qian, Y. Z. ^[1]; Li, C. L. ^[1]; Bi, H. L. ^[6]; Chen, Y. ^[1]; Yuan, X. L. ^[1]; Han, X. F. ^[1]; Zhu, X. ^[1];

^[1]; Zhang, L. ^[1]; Liu, H. Q. ^[1]; Wang, L. ^[1]; Gong, X. Z. ^[1] more »

Chinese Academy of Sciences, Anhui (China)
Chinese Academy of Sciences, Anhui (China); CAS key Laboratory of Photovoltaic and Energy Conservation Materials, Hefei (China)
Princeton Univ., Princeton, NJ (United States)
Chinese Academy of Sciences, Anhui (China); Princeton Univ., Princeton, NJ (United States)
Chinese Academy of Sciences, Anhui (China); Shenzhen Univ., Shenzhen (China)
Hefei Univ. of Technology, Hefei (China)
Johns Hopkins Univ., Baltimore, MD (United States)
Univ. of Chinese Academy of Sciences, Beijing (China)

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. Lastly, short-lived ELM-free phases were observed for the first time in EAST during FLiLi insertion, with increasing τ E and transient H_{98(y, 2)} < 2.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: EAST team

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1512785

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 1 Vol. 59; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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