Real time wall conditioning with lithium powder injection in long pulse H-mode plasmas in EAST with tungsten divertor

EAST Team

doi:10.1016/j.nme.2019.02.029

Real time wall conditioning with lithium powder injection in long pulse H-mode plasmas in EAST with tungsten divertor

EAST Team

Fusion Energy Division

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Real-time lithium powder injection has been applied to long-pulse (>30 s) H-mode plasmas in EAST. This replenishes the active lithium surface that is routinely consumed by plasma-wall interactions. The real-time injection of Li powder into long H-mode discharges effectively suppresses impurity influx and controls recycling on EAST, with an ITER-like tungsten upper divertor. With lithium powder injection, the concentrations W, Mo, and C were reduced by 50% compared to ELMy H-mode discharges. During lithium injection, two effects play a role in the suppression of impurities influx: a reduced divertor temperature and heat flux and hence reduced erosion, and impurity trapping via deposition of a Li film onto plasma-facing surfaces. The ‘fresh’ injected lithium replenishes the film deposited during daily morning evaporation, restoring the wall's pumping capability. Thus, a measurable reduction in the global recycling coefficient was observed.

Original language	English
Pages (from-to)	124-130
Number of pages	7
Journal	Nuclear Materials and Energy
Volume	19
DOIs	https://doi.org/10.1016/j.nme.2019.02.029
State	Published - May 2019

Funding

This research was funded in part by the US Department of Energy contracts DE-AC02-09CH11466 and DE-AC05-00OR22725 , and the National Key Research and Development Program of China ( 2017YFA0402500 ), National Nature Science Foundation of China ( 11625524 , 11775261 , 11605246 , 11075185 and 11021565 ). This research was funded in part by the US Department of Energy contracts DE-AC02-09CH11466 and DE-AC05-00OR22725, and the National Key Research and Development Program of China (2017YFA0402500), National Nature Science Foundation of China (11625524, 11775261, 11605246, 11075185 and 11021565).

Funders	Funder number
National Nature Science Foundation of China
US Department of Energy
U.S. Department of Energy	DE-AC05-00OR22725, DE-AC02-09CH11466
National Natural Science Foundation of China	11075185, 11605246, 11625524, 11775261, 11021565
National Basic Research Program of China (973 Program)	2017YFA0402500

Keywords

Impurity
Lithium
Long pulse plasma
Recycling

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nme.2019.02.029

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title = "Real time wall conditioning with lithium powder injection in long pulse H-mode plasmas in EAST with tungsten divertor",

abstract = "Real-time lithium powder injection has been applied to long-pulse (>30 s) H-mode plasmas in EAST. This replenishes the active lithium surface that is routinely consumed by plasma-wall interactions. The real-time injection of Li powder into long H-mode discharges effectively suppresses impurity influx and controls recycling on EAST, with an ITER-like tungsten upper divertor. With lithium powder injection, the concentrations W, Mo, and C were reduced by 50% compared to ELMy H-mode discharges. During lithium injection, two effects play a role in the suppression of impurities influx: a reduced divertor temperature and heat flux and hence reduced erosion, and impurity trapping via deposition of a Li film onto plasma-facing surfaces. The {\textquoteleft}fresh{\textquoteright} injected lithium replenishes the film deposited during daily morning evaporation, restoring the wall's pumping capability. Thus, a measurable reduction in the global recycling coefficient was observed.",

keywords = "Impurity, Lithium, Long pulse plasma, Recycling",

author = "{EAST Team} and Z. Sun and R. Maingi and Hu, {J. S.} and W. Xu and Zuo, {G. Z.} and Yu, {Y. W.} and Wu, {C. R.} and M. Huang and Meng, {X. C.} and L. Zhang and L. Wang and Mao, {S. T.} and F. Ding and Mansfield, {D. K.} and J. Canik and R. Lunsford and A. Bortolon and Gong, {X. Z.}",

note = "Publisher Copyright: {\textcopyright} 2019",

year = "2019",

month = may,

doi = "10.1016/j.nme.2019.02.029",

language = "English",

volume = "19",

pages = "124--130",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

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TY - JOUR

T1 - Real time wall conditioning with lithium powder injection in long pulse H-mode plasmas in EAST with tungsten divertor

AU - EAST Team

AU - Sun, Z.

AU - Maingi, R.

AU - Hu, J. S.

AU - Xu, W.

AU - Zuo, G. Z.

AU - Yu, Y. W.

AU - Wu, C. R.

AU - Huang, M.

AU - Meng, X. C.

AU - Zhang, L.

AU - Wang, L.

AU - Mao, S. T.

AU - Ding, F.

AU - Mansfield, D. K.

AU - Canik, J.

AU - Lunsford, R.

AU - Bortolon, A.

AU - Gong, X. Z.

PY - 2019/5

Y1 - 2019/5

N2 - Real-time lithium powder injection has been applied to long-pulse (>30 s) H-mode plasmas in EAST. This replenishes the active lithium surface that is routinely consumed by plasma-wall interactions. The real-time injection of Li powder into long H-mode discharges effectively suppresses impurity influx and controls recycling on EAST, with an ITER-like tungsten upper divertor. With lithium powder injection, the concentrations W, Mo, and C were reduced by 50% compared to ELMy H-mode discharges. During lithium injection, two effects play a role in the suppression of impurities influx: a reduced divertor temperature and heat flux and hence reduced erosion, and impurity trapping via deposition of a Li film onto plasma-facing surfaces. The ‘fresh’ injected lithium replenishes the film deposited during daily morning evaporation, restoring the wall's pumping capability. Thus, a measurable reduction in the global recycling coefficient was observed.

AB - Real-time lithium powder injection has been applied to long-pulse (>30 s) H-mode plasmas in EAST. This replenishes the active lithium surface that is routinely consumed by plasma-wall interactions. The real-time injection of Li powder into long H-mode discharges effectively suppresses impurity influx and controls recycling on EAST, with an ITER-like tungsten upper divertor. With lithium powder injection, the concentrations W, Mo, and C were reduced by 50% compared to ELMy H-mode discharges. During lithium injection, two effects play a role in the suppression of impurities influx: a reduced divertor temperature and heat flux and hence reduced erosion, and impurity trapping via deposition of a Li film onto plasma-facing surfaces. The ‘fresh’ injected lithium replenishes the film deposited during daily morning evaporation, restoring the wall's pumping capability. Thus, a measurable reduction in the global recycling coefficient was observed.

KW - Impurity

KW - Lithium

KW - Long pulse plasma

KW - Recycling

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DO - 10.1016/j.nme.2019.02.029

M3 - Article

AN - SCOPUS:85062023660

SN - 2352-1791

VL - 19

SP - 124

EP - 130

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

ER -

Real time wall conditioning with lithium powder injection in long pulse H-mode plasmas in EAST with tungsten divertor

Abstract

Funding

Keywords

UN SDGs

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