Preliminary results of in situ laser-induced breakdown spectroscopy for the first wall diagnostics on EAST

Zhenhua HU (胡振华); Cong LI (李聪); Qingmei XIAO (肖青梅); Ping LIU (刘平); Fang DING (丁芳); Hongmin MAO (毛红敏); Jing WU (吴婧); Dongye ZHAO (赵栋烨); Hongbin DING (丁洪斌); Guang-Nan LUO (罗广南); EAST team

doi:10.1088/2058-6272/19/2/025502

Plasma Science and Technology > 2017 > 19(2): 25502-025502. > DOI: 10.1088/2058-6272/19/2/025502

Zhenhua HU (胡振华), Cong LI (李聪), Qingmei XIAO (肖青梅), Ping LIU (刘平), Fang DING (丁芳), Hongmin MAO (毛红敏), Jing WU (吴婧), Dongye ZHAO (赵栋烨), Hongbin DING (丁洪斌), Guang-Nan LUO (罗广南), EAST team. Preliminary results of in situ laser-induced breakdown spectroscopy for the first wall diagnostics on EAST[J]. Plasma Science and Technology, 2017, 19(2): 25502-025502. DOI: 10.1088/2058-6272/19/2/025502

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Preliminary results of in situ laser-induced breakdown spectroscopy for the first wall diagnostics on EAST

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China 2 Key Laboratory of Materials Modi?cation by Laser, Ion and Electron Beams, Chinese Ministry of Education, School of Physics and Optical Electronic Technology, Dalian University of Technology, Dalian 116024, People’s Republic of China

Funds: Supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2013GB105002, 2015GB109001, and 2013GB109005), National Natural Science Foundation of China (Nos. 11575243, 11605238, 11605023), Chinesisch-Deutsches Forschungs Project (GZ765), and Korea Research Council of Fundamental Science and Technology (KRCF) under the international collaboration & research in Asian countries (PG1314).

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Received Date: June 20, 2016

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Abstract

Abstract

Post-mortem methods cannot fulfill the requirement of monitoring the lifetime of the plasma facing components (PFC) and measuring the tritium inventory for the safety evaluation. Laser-induced breakdown spectroscopy (LIBS) is proposed as a promising method for the in situ study of fuel retention and impurity deposition in a tokamak. In this study, an in situ LIBS system was successfully established on EAST to investigate fuel retention and impurity deposition on the first wall without the need of removal tiles between plasma discharges. Spectral lines of D, H and impurities (Mo, Li, Si, K ) in laser-induced plasma were observed and identified within the wavelength range of 500–700 nm. Qualitative measurements such as thickness of the deposition layers, element depth profile and fuel retention on the wall are obtained by means of in situ LIBS. The results demonstrated the potential applications of LIBS for in situ characterization of fuel retention and co-deposition on the first wall of EAST.
- tokamak,
- laser-induced breakdown spectroscopy,
- impurity deposition,
- fuel retention,
- plasma wall interaction

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References (22)

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