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

Abstract

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 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 [J.S. Hu et al., Phys. Rev. Lett. 114 (2015) 055001]. These results can be compared with recent observations with lithium pellets in ASDEX-Upgrade that failed to mitigate ELMs [P.T. Lang et al., Nucl. Fusion 57 (2017) 016030], highlighting one comparative advantage of continuous powder injection for real-time ELM elimination.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
DOE Contract Number:  
AC02-09CH11466
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
U. S. Department of Energy
Keywords:
Recycling
OSTI Identifier:
1562064
DOI:
10.11578/1562064

Citation Formats

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, and Li, Y Y. ELM elimination with Li powder injection in EAST discharges using the tungsten upper divertor. United States: N. p., 2017. Web. doi:10.11578/1562064.
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. ELM elimination with Li powder injection in EAST discharges using the tungsten upper divertor. United States. doi:10.11578/1562064.
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, and Li, Y Y. 2017. "ELM elimination with Li powder injection in EAST discharges using the tungsten upper divertor". United States. doi:10.11578/1562064. https://www.osti.gov/servlets/purl/1562064. Pub date:Fri Dec 01 00:00:00 EST 2017
@article{osti_1562064,
title = {ELM elimination with Li powder injection in EAST discharges using the tungsten upper divertor},
author = {Maingi, R and Hu, J S and Sun, Z and Tritz, K and Zuo, G Z and Xu, W and Huang, M and Meng, X C and Canik, J M and Diallo, A and Lunsford, R and Mansfield, D K and Osborne, T H and Gong, X Z and Wang, Y F and Li, Y Y},
abstractNote = {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 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 [J.S. Hu et al., Phys. Rev. Lett. 114 (2015) 055001]. These results can be compared with recent observations with lithium pellets in ASDEX-Upgrade that failed to mitigate ELMs [P.T. Lang et al., Nucl. Fusion 57 (2017) 016030], highlighting one comparative advantage of continuous powder injection for real-time ELM elimination.},
doi = {10.11578/1562064},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {12}
}

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