ELM elimination with Li powder injection in EAST discharges using the tungsten upper divertor

Maingi, R.; Hu, J. S.; Sun, Z.; Tritz, K.; Zuo, G. Z.; Xu, W.; Huang, M.; Meng, X. C.; Canik, J. M.; Diallo, A.; Lunsford, R.; Mansfield, D. K.; Osborne, T. H.; Gong, X. Z.; Wang, Y. F.; Li, Y. Y.

doi:10.1088/1741-4326/aa9e3f

Title: ELM elimination with Li powder injection in EAST discharges using the tungsten upper divertor

Journal Article · Fri Jan 05 00:00:00 EST 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa9e3f· OSTI ID:1419788

^[1]; Hu, J. S. ^[2]; Sun, Z. ^[2]; Tritz, K. ^[3]; Zuo, G. Z. ^[2]; Xu, W. ^[2]; Huang, M. ^[2]; Meng, X. C. ^[4]; Canik, J. M. ^[5]; Diallo, A. ^[1]; Lunsford, R. ^[1]; Mansfield, D. K. ^[1]; Osborne, T. H. ^[6]; Gong, X. Z. ^[2];

^[2]; Li, Y. Y. ^[2]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Chinese Academy of Sciences, Anhui (People's Republic of China)
Johns Hopkins Univ., Baltimore, MD (United States)
Hunan Univ., Changsha (People's Republic of China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)

Here, we report the first successful use of lithium (Li) to eliminate edge-localized modes (ELMs) with tungsten divertor plasma-facing components in the EAST device. Li powder injected into the scrape-off layer of the tungsten upper divertor successfully eliminated ELMs for 3–5 s in EAST. The ELM elimination became progressively more effective in consecutive discharges at constant lithium delivery rates, and the divertor D _α baseline emission was reduced, both signatures of improved wall conditioning. A modest decrease in stored energy and normalized energy confinement was also observed, but the confinement relative to H98 remained well above 1, extending the previous ELM elimination results via Li injection into the lower carbon divertor in EAST. These results can be compared with recent observations with lithium pellets in ASDEX-Upgrade that failed to mitigate ELMs, highlighting one comparative advantage of continuous powder injection for real-time ELM elimination.

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

Sponsoring Organization:: USDOE

Contributing Organization:: EAST team

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; FG02-09ER55012; 2013GB114004; 2017YFA0402500; 11405210; 11605246; 11625524

OSTI ID:: 1419788

Journal Information:: Nuclear Fusion, Vol. 58, Issue 2; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 41 works

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Simultaneous measurement of C VI, Ne X, and Li III charge exchange lines on EAST Li, Y. Y.; Zhou, Y. X.; Jiang, D. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5036835	journal	October 2018
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Investigation of edge impurity transport and divertor fluxes by toroidally localized lithium injection on EAST with EMC3-EIRENE Xie, T.; Dai, S. Y.; Sun, Z. Plasma Physics and Controlled Fusion, Vol. 61, Issue 11 https://doi.org/10.1088/1361-6587/ab434a	journal	October 2019
EMC3-EIRENE modelling of edge plasma and impurity emissions compared with the liquid lithium limiter experiment on EAST Xie, T.; Dai, S. Y.; Zuo, G. Z. Nuclear Fusion, Vol. 58, Issue 10 https://doi.org/10.1088/1741-4326/aad42f	journal	August 2018
ELM frequency enhancement and discharge modification through lithium granule injection into EAST H-modes Lunsford, R.; Hu, J. S.; Sun, Z. Nuclear Fusion, Vol. 58, Issue 12 https://doi.org/10.1088/1741-4326/aae2c1	journal	October 2018
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. Nuclear Fusion, Vol. 59, Issue 1 https://doi.org/10.1088/1741-4326/aaedcb	journal	November 2018
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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
edge localized modes
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