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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:44 |
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Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Optimization and calibration of non-destructive analysis methods applied on fusion relevant samples
Authors:
Mihail LUNGU(1,2), Cosmin DOBREA(1), Ion TISEANU(1)
*
Affiliation:
1) National Institute for Laser, Plasma and Radiation Physics, 077125 Bucharest, Romania;
2) University of Bucharest, Faculty of Physics, Atomistilor Str. 405, 077125, Magurele, Romania;
E-mail
mihail.lungu@inflpr.ro
Keywords:
structural integrity inspection, X-ray fluorescence, fusion, erosion, material deposition;
Abstract:
From the latest experiments conducted in the science society it is well known that tungsten will be used as primary material for the plasma facing components in the future fusion reactors. In the tokamak type fusion reactor, plasma-wall interactions determine irreversible modifications on the plasma facing components. Chemical, physical erosion and redeposition phenomena are of great interest in order to understand and predict the plasma-wall interactions. Taking into account the importance of the physical process, it is of great interest to optimize a non-invasive technique. In the current work we conduct our investigations on exposed and non exposed fusion relevant samples, using X-ray fluorescence based methods (XRF). Therefore, eroded or redeposit zones of the analyzed tiles are of interest. The optimization process starts from the fact that the XRF based methods need to be calibrated in order to provide quantitative results, regarding deposition thickness and composition. It was observed in our past laboratory experiments, the need for correcting the matrix coefficients which are responsible for amplification or attenuation of the analyzed elemental characteristic energetic line. A solution is the Monte Carlo simulation algorithms for the realistic experimental configuration. In consequence, matrix coefficients were determined in order to correct the fluorescence spectrum. An accurate quantitative interpretation of the resulted acquired spectrum was possible by simulating the fluorescence spectrum for different fusion related elements in order to determine thickness related calibration curves. Proper calibrated results on fusion relevant materials are reported in this paper.
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