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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:53 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
CALIBRATION OF X-RAY FLUORECENCE METHODS USED FOR SURFACE ANALYSIS OF PLASMA FACING COMPONENTS
Authors:
Mihail LUNGU (1,2), Ion TISEANU (1), Cosmin DOBREA (1), Corneliu POROSNICU (1)
Affiliation:
1)National Institute for Laser, Plasma and Radiation Physics (INFLPR), Magurele, 077125, Romania
2)Faculty of Physics, University of Bucharest, Magurele, Romania
E-mail
mihail.lungu@inflpr.ro
Keywords:
XRF, TVA, plasma fusion, Monte Carlo
Abstract:
The constant development of our society is dependent on the efficiency in energy production. Green energy production is required to be obtained with minimal environmental damage, meaning reduced emission of CO2 in the atmosphere. Despite the fact that in the past years massive investments were directed toward new methods of using green energy resources, these, such as wind power or solar radiation are not exploited at their full capacity [1, 2].
A satisfying progress in the nuclear fusion research and development (R&D) was achieved in the last decades. This type of energy presents interest due to the reaction type that reduces significantly the gaseous emissions in the atmosphere and does not produce radioactive waste that is the case for the fission reactions.
In order to build a fusion reactor at a large commercial scale it is important for the R&D to focus on the plasma facing components. Study upon the interaction between plasma and components that form the inner wall of the fusion reactor led to the setting and defining parameters used for choosing the optimal material for the ITER reactor first wall - beryllium and divertor area - tungsten (W). Investigations of the deposition, redeposition and the transport of W particles that occur during the operation of a fusion reactor are conducted in the National Institute for Lasers, Plasma and Radiation Physics, Romania (NILPRP).
This work is focused on calibration and optimization study of the investigation methods that use the X-ray fluorescence (XRF) principle. In order to analyze W coatings of a large range of thicknesses (from <10 nm up to 40 µm) we applied methods of analysis based on XRF excited by X-ray sources of 20÷200 kVp energy. To calibrate these analysis methods we produced marker samples of known thickness using Thermionic Vacuum Arc deposition method (TVA) [3]. The number of marker samples is augmented by Monte Carlo realistic simulation of XRF response of known deposits. With the help of these calibration curves it is possible to convert the integrated area of the captured spectrum into conventional thickness or atomic concentration units.
References:
[1] J. Ongena and G. V. Oost, Energy for future centuries," Transactions of Fusion Science and Technology, vol. 57, no. 2T, pp. 3{15, 2010.
[2] D. J. MacKay, Sustainable Energy - Without the Hot Air. UIT Cambridge Ltd,2009.
[3]C. P. Lungu, I. Mustata, G. Musa, V. Zaroschi, A. M. Lungu and K. Iwasaki, Vacuum, 76, 127 (2004).
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