Abstract
In order to quantitatively determine the retention of light atoms by plasma facing components (mainly tungsten) used in fusion reactors, the Laser-Induced Breakdown Spectroscopy (LIBS) technique can be used. The nanosecond laser regimes classically used for LIBS present major limitations mainly due to the conditions of the laser-matter interaction process itself and cannot be used in the present context. Picosecond laser pulses are more appropriate. To validate the diagnostic based on picosecond laser pulses, preliminary characterizations of the produced plasmas have to be performed. Some related results are reported in the present communication. The study is focused on (1) the ablation of tungsten under two laser (low and high) fluence conditions and (2) the excitation equilibrium of the plasma from the nanosecond to microsecond time scales.
Highlights
The quantitative detection of light elements trapped in heavy atoms-based matrices and their superficial gradients stay a challenge difficult to address [1]
In order to quantitatively determine the retention of light atoms by plasma facing components used in fusion reactors, the Laser-Induced Breakdown Spectroscopy (LIBS) technique can be used
The nanosecond laser regimes classically used for LIBS present major limitations mainly due to the conditions of the laser-matter interaction process itself and cannot be used in the present context
Summary
- Picosecond LIBS diagnostics for Tokamak in situ plasma facing materials chemical analysis Vincent Morel, Bastien Pérès, Arnaud Bultel et al. - Elaboration of collisional-radiative models applied to Earth and Mars entry problems Julien Annaloro, Arnaud Bultel and Pierre Omaly
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