ELM elimination with Li powder injection in EAST discharges using the tungsten upper divertor
- 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.
- 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
Web of Science
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