Plasma spectroscopy and diagnosis lab
Paper
Characterization of multi-element impurity deposited on EAST divertor tile using laser-induced breakdown spectroscopy
Release Time:2020-06-02
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First Author:
Imran, Muhammad
Correspondence Author:
Hai, R; Ding, HB (reprint author), Dalian Univ Technol, Sch Phys, Key Lab Mat Modificat Laser Ion & Electron Beams, Chinese Minist Educ, Dalian 116024, Peoples R China.
Co-author:
Hu, Zhen-Hua,He, Zhong-Lin,Wu, Ding,Li, Cong,Wang, Wan-Jing,Luo, Guang-Nan,Ding, Hongbin,Hai, Ran,Sun, Li-Ying,Sattar, Harse
Date of Publication:
2019-12-01
Journal:
JOURNAL OF NUCLEAR MATERIALS
Included Journals:
SCIE、EI
Document Type:
J
Volume:
526
ISSN:
0022-3115
Key Words:
EAST; Plasma facing components; Impurity deposition; LIBS; Depth
profile; EDX; Graphite tile
Abstract:
Laser-induced breakdown spectroscopy (LIBS) has been applied for the depth-resolved identification of impurity deposited on EAST divertor tile. LIBS spectra show the presence of impurity elements (W, Mo, Li, Na, Ca, Cr) and tile material (C, Si, Ti) in the layer deposited on the graphite tile surface. The analysis of impurity deposition was performed in different positions on tile surface. The results indicate that the interaction of high heat plasma with plasma facing components (PFCs) leads to erosion of Mo from first wall and W from upper divertor. Depth profiling measurements show decay of impurity signals with successive laser shots and non-uniform impurity deposition in the different positions on tile surface. The impurity deposition was also measured at the different depths in the tile. The measurements show a non-uniform deposition at various depths in the deposition layer. Surface morphology and composition of tile were verified by SEM and EDX techniques. The study indicates that LIBS has potential to monitor the erosion and deposition of PFCs in fusion devices. The results obtained from LIBS technique are important for long pulse of H-mode plasma operation in EAST. (C) 2019 Elsevier B.V. All rights reserved.
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