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Theses

Study of combined effects of radiation and temperature on silica based material and optical fibers

Abstract : This thesis is part of the CERTYF research project, acronym of Combined Effects of Radiation Temperature and hYdrogen in optical Fibers. The CERTYF project aims to improve knowledge on the degradation processes of silica-based material and optical fibers used in severe or harsh environments combining irradiation constraints, hydrogen and temperature (R-H-T), such as the one encountered by ANDRA (Agence nationale pour la gestion des déchets radioactifs). When exposed to radiation, the optical fiber becomes less guiding due to the creation of defects. These defects are characterized by energy levels within the bandgap of the material. Thus, when the light is injected inside an optical fiber the transmitted part of this light decreases and conversely, the radiation induced attenuation (RIA) increases. The objectives of the RIA control are to develop radiation tolerant systems capable of operating in the radioactive waste storage sites or, on the contrary, of improving the sensitivity of fibers when used for the detection of the radiation dose or dose rate present in the radiative environment. This work focuses on building of a physical model capable of predicting RIA in this severe/harsh environment through an experimental study based on thermoluminescence (TL) and absorption spectroscopy leading to the understanding of the point defects creation mechanisms induced by the irradiation. The resulting radiation induced attenuation is a complex process depending on several parameters like the wavelength, dose, dose rate, temperature and fiber composition. All these parameters that must be considered in the modeling reflect the several issues that limit the fiber integration in combined environments.
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Submitted on : Thursday, October 14, 2021 - 9:28:10 AM
Last modification on : Friday, October 15, 2021 - 3:27:27 AM

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  • HAL Id : tel-03377158, version 1

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Angela Guttilla. Study of combined effects of radiation and temperature on silica based material and optical fibers. Physics [physics]. Université Côte d'Azur, 2021. English. ⟨NNT : 2021COAZ4038⟩. ⟨tel-03377158⟩

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