基于LIBS技术的托卡马克装置壁表面成分在线诊断研究

In situ diagnosis of the co-deposition compositions onthe first wall of Tokamak using LIBS

托卡马克装置是环形的等离子体约束系统,被认为是最有可能实现受控热核聚变的方式.等离子体与壁材料相互作用(Plasma wall interaction,PWI)过程所产生的杂质会严重威胁托卡马克装置的高参量稳态运行,因而发展有效的壁杂质监测方法十分关键.激光诱导击穿光谱(Laser-induced breakdown spectroscopy,LIBS)技术被视为极具潜力的壁表面元素分析技术,相关研究有助于PWI各种物理过程和机理的深入理解,以及发展PWI的控制方法.本文对国内外LIBS壁诊断相关研究现状进行评述,并阐述LIBS壁诊断技术的发展趋势和亟待解决的关键问题.

Tokamak devices are toroidal plasma confinement systems,which are considered as the feasible methods to harness the energy of the controlled nuclear fusion.The plasma wall interaction(PWI)will produce impurities which will obstruct the high-parameter steady-state operation of Tokamak devices.The effective test method for the wall purities becomes crucial.Laser-induced breakdown spectroscopy(LIBS)is a versatile elemental analysis technique,which has been regarded as an effective diagnostic methods of monitoring elemental impurity deposition.The LIBS relevant researches are helpful for the understanding of physical processes and mechanisms of PWI and the development of PWI control methods.In this paper,the overseas and domestic research status of the LIBS analysis for the PFM diagnostics were reviewed and the development trend and the key problems of LIBS application in fusion were discussed.