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This content will become publicly available on January 5, 2019

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

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.
Authors:
ORCiD logo [1] ;  [2] ;  [2] ;  [3] ;  [2] ;  [2] ;  [2] ;  [4] ;  [5] ;  [1] ;  [1] ;  [1] ;  [6] ;  [2] ; ORCiD logo [2] ;  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Chinese Academy of Sciences, Anhui (People's Republic of China)
  3. Johns Hopkins Univ., Baltimore, MD (United States)
  4. Hunan Univ., Changsha (People's Republic of China)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. General Atomics, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-09CH11466; FC02-04ER54698; FG02-09ER55012; 2013GB114004; 2017YFA0402500; 11405210; 11605246; 11625524
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 2; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
EAST team
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; edge localized modes; plasma wall interactions; lithium seeding; edge stability
OSTI Identifier:
1419788