| Description |
The study deals with the applications of laser-induced breakdown spectroscopy (LIBS) for the analysis of different nuclear material of interest for nuclear fusion device including plasma facing components like optical window, flange, limiter, plasma dust present within the tokamak chamber and different part of tokamak wall. On the basis of LIBS technique qualitative, quantitative, depth profile and spatial analysis have been performed. Plasma parameters like electron number density and temperature, measurement of hardness and presence of different matrices at different part of the sample etc. have been described. The quantitative analysis of the samples using calibration free LIBS (CF-LIBS) method has been illustrated. Statistical analysis such as principal component analysis (PCA) has also been applied to LIBS data for rapid identification/classification of different sample and its different parts. An experimental setup for on-line LIBS analysis of impurity layers deposited on plasma-facing components (PFCs) of a tokamak has also been designed. The applicability of the setup have also been checked by recording the LIBS spectra a tokamak wall material like a stainless steel sample (SS304) through contaminated and cleaned optical windows. A new approach known as “back collection method” to record LIBS spectra of impurities deposited on the inner surface of optical window is presented. Results clearly demonstrate the capability of LIBS technique for in-situ and on-line analysis of plasma facing components of the tokamak.
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