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
Hits:
Indexed by:Journal Papers
Date of Publication:2017-11-01
Journal:Spectrochimica Acta - Part B Atomic Spectroscopy
Included Journals:Scopus、SCIE、EI、CPCI-S
Volume:137
Page Number:70-76
ISSN No.:05848547
Key Words:Time-of-flight mass spectroscopy; Laser induced breakdown spectroscopy; Tungsten plasma; Multi-charged ions; Dynamic plasma sheath
Abstract:In this work, the plasma was produced by irradiating a tungsten target with an 8 ns pulsed Nd:YAG (λ = 1064 nm) laser in a vacuum chamber under the pressure of 4 × 10 ?4Pa. The optical and particle emissions were systematically investigated using laser induced breakdown spectroscopy and time-of-flight mass spectroscopy respectively. The results showed that not only there were neutral and single ionized atoms in the laser induced plasma, but also quite a number of multi-charged ions were observed. The ion charge state was even up to 6 at the laser power density of ~ 11 GW/cm2. Time and space resolved optical spectroscopy was investigated by using a bundle of lined fibers. Meanwhile, the time-resolved mass spectrometric study of laser produced tungsten plasma was carried out. The variation in intensities of the different species with time showed that higher charged ions reached their peak intensities earlier. This demonstrated that the higher charged ions had higher velocities and the different charged ions were separated during the expansion process. The kinetic energy corresponding to the velocity of the ions was found to increase exponentially with ionic charge state which was related to the acceleration of the dynamic plasma sheath. © 2017 Elsevier B.V.
海然,副教授,博士生导师,国家重点研发项目负责人,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年9月至2016年10月公派赴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。
主要从事基于激光光谱技术托卡马克装置内壁状态原位诊断、等离子体与壁材料相互作用研究,同时,包括环境污染、工业样品中多元素成分的远程、实时、定量化激光光谱分析、有机物快速分类等研究工作。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30余篇,SCI-Q1分区封面论文3篇,已授权发明专利10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。