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Title: Mitigation of plasma–material interactions via passive Li efflux from the surface of a flowing liquid lithium limiter in EAST

Here, a new flowing liquid Li limiter (FLiLi) based on the concept of a thin flowing film has been successfully designed and tested in the EAST device in 2014. A bright Li radiative mantle at the plasma edge was observed during discharges using FLiLi, resulting from passive Li injection and transport in the scrape-off layer (SOL) plasma. Li particle efflux from the FLiLi surface into the plasma was estimated at >5 × 10 20 atom s –1, due to surface evaporation and sputtering, and accompanied with a few small Li droplets ~1 mm diameter that were ejected from FLiLi. The Li efflux from FLiLi was ionized by the SOL plasma and formed a Li radiation band that originated from the FLiLi surface, and then spread toroidally by SOL plasma flow. The Li radiative mantle appeared to partly isolate the plasma from the wall, reducing impurity release from the wall materials, and possibly leading to a modest improvement in confinement. In addition, strong Li radiation reduced the particle and heat fluxes impacting onto the divertor plate, with certain similarities to heat flux reduction and detachment onset via low-Z impurity injection.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [4] ;  [2] ;  [5] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Chinese Academy of Sciences, Anhui (People's Republic of China)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Johns Hopkins Univ., Baltimore, MD (United States)
  4. LiWallFusion, Princeton, NJ (United States)
  5. Chinese Academy of Sciences, Anhui (People's Republic of China); Hunan Univ., Changsha (People's Republic of China)
Publication Date:
Grant/Contract Number:
AC02-09CH11466; 11261140328; 11321092; 11625524; 11405210; 2013GB114004
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 4; 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; flowing liquid Li; Li radiative mantle; plasma–material interactions; EAST
OSTI Identifier:
1373686

Zuo, G. Z., Hu, J. S., Maingi, R., Ren, J., Sun, Z., Yang, Q. X., Chen, Z. X., Xu, H., Tritz, K., Zakharov, L. E., Gentile, C., Meng, X. C., Huang, M., Xu, W., Chen, Y., Wang, L., Yan, N., Mao, S. T., Yang, Z. D., and Li, J. G.. Mitigation of plasma–material interactions via passive Li efflux from the surface of a flowing liquid lithium limiter in EAST. United States: N. p., Web. doi:10.1088/1741-4326/aa5ea0.
Zuo, G. Z., Hu, J. S., Maingi, R., Ren, J., Sun, Z., Yang, Q. X., Chen, Z. X., Xu, H., Tritz, K., Zakharov, L. E., Gentile, C., Meng, X. C., Huang, M., Xu, W., Chen, Y., Wang, L., Yan, N., Mao, S. T., Yang, Z. D., & Li, J. G.. Mitigation of plasma–material interactions via passive Li efflux from the surface of a flowing liquid lithium limiter in EAST. United States. doi:10.1088/1741-4326/aa5ea0.
Zuo, G. Z., Hu, J. S., Maingi, R., Ren, J., Sun, Z., Yang, Q. X., Chen, Z. X., Xu, H., Tritz, K., Zakharov, L. E., Gentile, C., Meng, X. C., Huang, M., Xu, W., Chen, Y., Wang, L., Yan, N., Mao, S. T., Yang, Z. D., and Li, J. G.. 2017. "Mitigation of plasma–material interactions via passive Li efflux from the surface of a flowing liquid lithium limiter in EAST". United States. doi:10.1088/1741-4326/aa5ea0. https://www.osti.gov/servlets/purl/1373686.
@article{osti_1373686,
title = {Mitigation of plasma–material interactions via passive Li efflux from the surface of a flowing liquid lithium limiter in EAST},
author = {Zuo, G. Z. and Hu, J. S. and Maingi, R. and Ren, J. and Sun, Z. and Yang, Q. X. and Chen, Z. X. and Xu, H. and Tritz, K. and Zakharov, L. E. and Gentile, C. and Meng, X. C. and Huang, M. and Xu, W. and Chen, Y. and Wang, L. and Yan, N. and Mao, S. T. and Yang, Z. D. and Li, J. G.},
abstractNote = {Here, a new flowing liquid Li limiter (FLiLi) based on the concept of a thin flowing film has been successfully designed and tested in the EAST device in 2014. A bright Li radiative mantle at the plasma edge was observed during discharges using FLiLi, resulting from passive Li injection and transport in the scrape-off layer (SOL) plasma. Li particle efflux from the FLiLi surface into the plasma was estimated at >5 × 1020 atom s–1, due to surface evaporation and sputtering, and accompanied with a few small Li droplets ~1 mm diameter that were ejected from FLiLi. The Li efflux from FLiLi was ionized by the SOL plasma and formed a Li radiation band that originated from the FLiLi surface, and then spread toroidally by SOL plasma flow. The Li radiative mantle appeared to partly isolate the plasma from the wall, reducing impurity release from the wall materials, and possibly leading to a modest improvement in confinement. In addition, strong Li radiation reduced the particle and heat fluxes impacting onto the divertor plate, with certain similarities to heat flux reduction and detachment onset via low-Z impurity injection.},
doi = {10.1088/1741-4326/aa5ea0},
journal = {Nuclear Fusion},
number = 4,
volume = 57,
place = {United States},
year = {2017},
month = {3}
}