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Article Dans Une Revue Physics of Plasmas Année : 2016

Experimental and numerical analysis of atmospheric air plasma induced by multi-MeV pulsed X-ray

Résumé

Quantification of electromagnetic stresses on electronic systems, following irradiation of the air by ionizing radiations, requires a thorough study of the plasma generated. In this work, the temporal evolution of non-equilibrium air plasmas self-induced by energetic X-rays is experimentally and theoretically investigated at atmospheric pressure. Time resolved electron density measurements are based on transmission measurements of an electromagnetic wave in the microwave range. The electromagnetic wave is launched into a wave guide, which is irradiated by a high flux of multi-MeV pulsed X-rays. For different X-ray fluxes, the electron density is determined from the comparison between the transmitted microwave signal at the waveguide output, and the result of the calculation of the propagation of an electromagnetic wave through time varying plasma contained in a waveguide. These measurements require a priori assumptions on electron temperature, which is obtained and confirmed by a reaction kinetics model of the evolution of the electron energy and the densities of the different humid air plasma species inside the waveguide. The considered chemical kinetics scheme involves 39 influent species (electrons, positive ions, negative ions, and neutral atoms and molecules in their ground or metastable excited states) reacting following 265 selected reactions. A good agreement is observed between the calculated and measured time evolution of the transmitted signal for specific profiles of electron energy and density. In our experiments, the maximum electron density is of the order of few 1012 cm−3, for a mean electron energy of about 0.5 eV. For doses range from 3 Gy to 21 Gy, the discrepancies between the measurements and the model for the maximum of the electron density are within a factor of 2.
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Dates et versions

hal-03819948 , version 1 (18-10-2022)

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Mélissa Maulois, Maxime Ribiere, Olivier Eichwald, Mohammed Yousfi, Romain Pouzalgues, et al.. Experimental and numerical analysis of atmospheric air plasma induced by multi-MeV pulsed X-ray. Physics of Plasmas, 2016, 23 (10), pp.102117. ⟨10.1063/1.4966048⟩. ⟨hal-03819948⟩
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