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个人信息Personal Information
教授
博士生导师
硕士生导师
主要任职：Professor Dr. Hongbin Ding
其他任职：物理学院学术委员会主任，等离子体联合研究中心主任,中国光学工程学会LIBS专委会副主任, 中国核学会核聚变等离子体分会常务理事，辽宁省物理学会副理事长，国际ITER-ITPA 委员
性别：男
毕业院校：巴塞尔大学
学位：博士
所在单位：物理学院
学科：等离子体物理. 光学工程
联系方式：hding@dlut.edu.cn
电子邮箱：hding@dlut.edu.cn
Characterization and removal of co-deposition on the first mirror of HL-2A by excimer laser cleaning
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论文类型：期刊论文
发表时间：2013-05-01
发表刊物：JOURNAL OF NUCLEAR MATERIALS
收录刊物：SCIE、EI
卷号：436
期号：1-3
页面范围：118-122
ISSN号：0022-3115
摘要：In this study, an excimer laser ablation has was proposed for the first time for removing the co-deposition layer of the first mirrors of HL-2A tokamak. It was found that this approach to be much more effective and homogeneous in the removal of the impurity, layer than using Nd:YAG lasers at 532 nm and 355 nm wavelengths. Time-of-flight mass spectrometry has been used for characterization of the released impurities during laser cleaning. X-ray photoelectron spectroscopy and secondary ion mass-spectrometry was used to evaluate the depth profile and chemical state of the compositions in the deposited layer. The results indicated that the ablation process can be characterized by two well-defined threshold fluences: (a) ablation threshold approximate to 0.01 J/cm(2) and (b) a damage threshold approximate to 0.55 J/cm(2). SEM has been used to characterize the ablation spot after cleaning at the different laser fluences. The results showed that the deposited layer was almost completely removed after multiple pulses and the repeated spatial scans at 0.3-0.55 J/cm(2). After the cleaning, the reflectivity of the first mirror was restored to 80% of full capacity in the wavelength range of 600-1100 nm. (c) 2013 Elsevier B.V. All rights reserved.