| Autor: |
Z. Sun, R. Maingi, J.S. Hu, W. Xu, G.Z. Zuo, Y.W. Yu, C.R. Wu, M. Huang, X.C. Meng, L. Zhang, L. Wang, S.T. Mao, F. Ding, D.K. Mansfield, J. Canik, R. Lunsford, A. Bortolon, X.Z. Gong |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Nuclear Materials and Energy, Vol 19, Iss , Pp 124-130 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2352-1791 |
| DOI: |
10.1016/j.nme.2019.02.029 |
| Popis: |
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. Keyword: Long pulse plasma, Lithium, Impurity, Recycling |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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