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

R Maingi, J Hu, Z Sun, K Tritz, G Zuo, W Xu, M Huang, X Meng, J Canik, A Diallo, R Lunsford, D Mansfield, T Osborne, X Gong, Y Wang & Y Li
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 sec in EAST. The ELM elimination became progressively more effective in consecutive discharges at constant lithium delivery rates, and the divertor D-alpha baseline emission was reduced, both signatures of improved wall conditioning. A modest decrease...
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