The Enhanced Effect of Optical Emission from Laser Induced Breakdown Spectroscopy of an Al-Li Alloy in the Presence of Magnetic Field Confinement

LIU Ping (刘平); HAI Ran (海然); WU Ding (吴鼎); XIAO Qingmei (肖青梅); SUN Liying (孙丽影); DING Hongbin (丁洪斌)

doi:10.1088/1009-0630/17/8/13

Plasma Science and Technology > 2015 > 17(8): 687-692. > DOI: 10.1088/1009-0630/17/8/13

LIU Ping (刘平), HAI Ran (海然), WU Ding (吴鼎), XIAO Qingmei (肖青梅), SUN Liying (孙丽影), DING Hongbin (丁洪斌). The Enhanced Effect of Optical Emission from Laser Induced Breakdown Spectroscopy of an Al-Li Alloy in the Presence of Magnetic Field Confinement[J]. Plasma Science and Technology, 2015, 17(8): 687-692. DOI: 10.1088/1009-0630/17/8/13

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The Enhanced Effect of Optical Emission from Laser Induced Breakdown Spectroscopy of an Al-Li Alloy in the Presence of Magnetic Field Confinement

Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Chinese Ministry of Education, School of Physics and Optical Electronic Technology, Dalian University of Technology, Dalian 116024, China

Funds: supported by the National Magnetic Confinement Fusion Science Program of China (No. 2013GB109005) and National Natural Science Foundation of China (No. 11175035), Chinesisch-Deutsches Forschungs Project (GZ768), the Fundamental Research Funds for the Central Universities, China (Nos. DUT12ZD(G)01, (DUT14ZD(G)04), MMLab Research Project (DP1051208)

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Received Date: February 07, 2015

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Abstract

Abstract

In this paper, the influence of magnetic field strength on laser-induced breakdown spectroscopy (LIBS) has been investigated for various pressures. The plasma plume was produced by employing Q-switch Nd:YAG laser ablation of an Al-Li alloy operating at a 1064 nm wavelength. The results indicated that the LIBS intensity of the Al and Li emission lines is boosted with an increase of magnetic strength. Typically, the intensity of the Al I and Li I spectral emissions can be magnified by 1.5-3 times in a steady magnetic field of 1.1 T compared with the field-free case. Also, in this investigation we recorded time-resolved images of the laser-produced plume by employing a fast ICCD camera. The results show that the luminance of the plasma is enhanced and the time of persistence is increased signi?cantly, and the plasma plume splits into two lobes in the presence of a magnetic field. The probable reason for the enhancement is the magnetic con?nement effect which increases the number density of excited atoms and the population of species in a high energy state. In addition, the electron temperature and density are also augmented by the magnetic field compared to the field-free case.
- LIBS,
- Al-Li alloy,
- magnetic con?nement,
- EAST device

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References

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