Use of dual-pulse laser-induced breakdown spectroscopy for characterization of the laser cleaning of a first mirror exposed in HL-2A

被引：23
作者：
Hai, Ran [1 ]
Wu, Xingwei [1 ]
Xin, Yu [1 ]
Liu, Ping [1 ]
Wu, Ding [1 ]
Ding, Hongbin [1 ]
Zhou, Yan [2 ]
Cai, Laizhong [2 ]
Yan, Longwen [2 ]
机构：
[1] Dalian Univ Technol, Sch Phys & Opt Elect Technol, Chinese Minist Educ, Key Lab Mat Modificat Laser Ion & Electron Beams, Dalian 116024, Peoples R China
[2] Southwestern Inst Phys, Chengdu 610041, Sichuan, Peoples R China
来源：
JOURNAL OF NUCLEAR MATERIALS | 2014年 / 447卷 / 1-3期
基金：
美国国家科学基金会;
关键词：
DIAGNOSTIC-TOOL; LIBS; PERFORMANCE; DEPOSITION; TOKAMAK; ALLOYS; PLASMA; WALL;
D O I：
10.1016/j.jnucmat.2013.12.019
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Our recent investigations have indicated that dual-pulse laser-induced breakdown spectroscopy (DP-LIBS) has great potential in the online measurement of the laser ablation process of the ultrathin co-deposition layer on the first mirrors of HL-2A tokamak during the cleaning. The spectroscopic study of the plasma emission can be used to determine the elemental composition of the ablated materials. The co-deposition layer (approximately 0.8 mu m) was completely removed after multiple pulses at 0.76 J/cm(2), but the plasma initiated by the cleaning laser pulse was too weak to produce LIBS signals. Notable enhancement of the signal emission was observed using DP-LIBS. The real-time monitoring and accurate identification the interface boundary can provide important information regarding the cleaned mirror surface in order to avoid under-cleaning. This could help us to develop more effective automatic control of the laser cleaning processes for fusion devices. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：9 / 14
页数：6
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