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Influence des effets électrostatiques liés à la radioactivité sur les forces d'adhésion et sur la mise en suspension de particules métalliques

Abstract : The mobility and containment of radioactive dust produced by plasma/wall interactions taking place in the heart of a tokamak have become, over the years, major topics for the safety assessment of the ITER installation. To address these safety issues, I adopted complementary approaches based on experimental and numerical work. A sampling campaign carried out in the tokamak WEST (CEA/IRFM) made it possible to identify tungsten particles of spherical shape and micrometric size. An in-depth parametric study of the adhesion forces acting between these particles and tungsten surfaces was performed using an atomic force microscope (AFM). This study was continued by performing measurements of the electric potential of particles when they are labeled with tritium using kelvin probe microscopy (KPFM). Finally, resuspension experiments with tungsten particles loaded with tritium were carried out. The results of these experiments, combined with the validation of a particle resuspension model, provide robust data for dust management, safety analyzes and the definition of radiation protection plans for future nuclear fusion facilities.
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Contributor : Samuel Peillon <>
Submitted on : Monday, November 23, 2020 - 3:05:50 PM
Last modification on : Tuesday, December 8, 2020 - 3:34:19 AM

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  • HAL Id : tel-03019747, version 1

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Samuel Peillon. Influence des effets électrostatiques liés à la radioactivité sur les forces d'adhésion et sur la mise en suspension de particules métalliques. Physique [physics]. Sorbonne Universite, 2020. Français. ⟨tel-03019747⟩

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