Ran Hai
Associate Professor Supervisor of Doctorate Candidates Supervisor of Master's Candidates
Gender:Male
Alma Mater:大连理工大学
Degree:Doctoral Degree
School/Department:物理学院
Discipline:Plasma physics
E-Mail:rhai@dlut.edu.cn
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Indexed by:Journal Papers
Date of Publication:2015-08-01
Journal:PLASMA SCIENCE & TECHNOLOGY
Included Journals:EI、SCIE、Scopus
Volume:17
Issue:8
Page Number:687-692
ISSN No.:1009-0630
Key Words:LIBS; Al-Li alloy; magnetic confinement; EAST device
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 significantly, and the plasma plume splits into two lobes in the presence of a magnetic field. The probable reason for the enhancement is the magnetic confinement 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.
海然,副教授,博士生导师,国家重点研发计划-青年项目负责人,大连市高端人才,大连市青年科技之星。博士毕业于大连理工大学等离子体物理专业。2014-2016年公派美国加州大学伯克利分校-劳伦斯伯克利国家实验室进行博士联合培养。
主要从事等离子体诊断、等离子体与材料相互作用,和工业、环境领域先进激光光谱技术开发及应用研究。近年来,重点针对磁约束核聚变装置运行极端环境,发展了壁材料元素、结构、服役性能的激光光谱诊断新技术,实现了远程、在线、定量化分析的目标。在Optics express, Journal of Analytical Atomic Spectrometry, Spectrochimica Acta Part B:Atomic Spectroscopy等国外核心杂志发表SCI论文60余篇,一作一区封面论文3篇,已授权发明专利12项;承担国家及省部级科研项目4项,参与重大科研项目多项,是我校牵头的国家重大ITER专项的研究骨干成员。