Temporal and spatial evolution measurement of laser-induced breakdown spectroscopy on hydrogen retention in tantalum

Cong LI (李聪); Jiajia YOU (游加加); Huace WU (武华策); Ding WU (吴鼎); Liying SUN (孙立影); Jiamin LIU (刘佳敏); Qianhui LI (李千惠); Ran HAI (海然); Xingwei WU (吴兴伟); Hongbin DING (丁洪斌)

doi:10.1088/2058-6272/ab823d

Plasma Science and Technology > 2020 > 22(7): 74008-074008. > DOI: 10.1088/2058-6272/ab823d

Cong LI (李聪), Jiajia YOU (游加加), Huace WU (武华策), Ding WU (吴鼎), Liying SUN (孙立影), Jiamin LIU (刘佳敏), Qianhui LI (李千惠), Ran HAI (海然), Xingwei WU (吴兴伟), Hongbin DING (丁洪斌). Temporal and spatial evolution measurement of laser-induced breakdown spectroscopy on hydrogen retention in tantalum[J]. Plasma Science and Technology, 2020, 22(7): 74008-074008. DOI: 10.1088/2058-6272/ab823d

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Temporal and spatial evolution measurement of laser-induced breakdown spectroscopy on hydrogen retention in tantalum

Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, People’' Republic of China

Funds: This work was supported by National Key R&D Program of China (No. 2017TFE0301300), the National Natural Science Foundation of China (Nos. 11605023, 11805028, 11861131010), and the China Postdoctoral Science Founda- tion (Nos. 2017T100172, 2016M591423).

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Received Date: December 30, 2019
Revised Date: March 18, 2020
Accepted Date: March 22, 2020

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Abstract

Abstract

Fuel retention measurement on plasma-facing components is an active field of study in magnetic confinement nuclear fusion devices. The laser-induced breakdown spectroscopy (LIBS) diagnostic method has been well demonstrated to detect the elemental distribution in PFCs. In this work, an upgraded co-axis LIBS system based on a linear fiber bundle collection system has been developed to measure the hydrogen (H) retention on a tantalum (Ta) sample under a vacuum condition. The spatial resolution measurement of the different positions of the LIBS plasma can be achieved simultaneously with varying delay times. The temporal and spatial evolution results of LIBS plasma emission show that the H plasma observably expands from the delay times of 0–200ns. The diameter of Ta plasma is about 6mm which is much less than the size of H plasma after 200ns. The difference in the temporal and spatial evolution behaviors between H plasma and Ta plasma is due to the great difference in the atomic mass of H and Ta. The depth profile result shows that H retention mainly exists on the surface of the sample. The temporal and spatial evolution behaviors of the electron excited temperature are consistent with that of the Ta emission. The result will further improve the understanding of the evolution of the dynamics of LIBS plasma and optimize the current collection system of in situ LIBS in fusion devices.
- temporal and spatial evolution,
- fuel retention,
- tokamak,
- laser-induced breakdownspectroscopy

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Temporal and spatial evolution measurement of laser-induced breakdown spectroscopy on hydrogen retention in tantalum