A technique for conducting of reactor in-situ tests of optical fibres and FBG-sensors intended for in-vessel applications in thermonuclear facilities

Gnyrya V.S. Tyurin Y.I. Kashaykin P.F. Kulsartov T.V. Kenzhina I.E. Zaurbekova Z.A. Samarkhanov K.K. Gordienko Y.N. Ponkratov Y.V. Askerbekov S.K. Tolenova A.U. Shaimerdenov A.A.
June 2023 Elsevier Ltd

Fusion Engineering and Design
2023 #191

A method for in-situ studies of the optical fibres (OFs) and the fibre Bragg grating (FBG) sensors radiation resistance under irradiation at the IVG.1 M research reactor (Kurchatov, Kazakhstan) was developed. For this purpose, an irradiation ampoule device (AD) was developed that makes it possible to carry out joint irradiation of investigated samples with a fast neutron flux of up to 2.4 10¹³ n/(cm²·s) and a dose rate of up to 1.57 kGy/s in the temperature range from 200 to 700 °C and pressures of 10–80 Pa. Studies of radiation-induced attenuation (RIA) of single-mode OF in various protective coatings (copper, aluminium and polyimide at a wavelength of 1.55 μm and in the spectral range from 1.1 to 1.7 μm were carried out. Fast neutron fluence and absorbed dose were Ф_E>0.1MeV=1.72·10¹⁷ n/cm² and Dγ=11.3 MGy, respectively. It has been established that the method of fibre winding in AD has a critical influence and leads to a parasitic contribution of temperature-induced stress-related losses to optical losses arising during reactor irradiation. The operability of FBG sensors up to a temperature of 500 °C has been demonstrated. The developed methods make it possible to conduct in-situ studies of the radiation resistance of fibre-optic components under conditions close to their applications in thermonuclear and nuclear facilities.

Experimental facility , FBG-based sensors , Irradiation device , IVG.1M research reactor , Mixed gamma-neutron irradiation , Optical fibre

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Institute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan, Kurchatov, Kazakhstan
Tomsk Polytechnic University, Tomsk, Russian Federation
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fibre Optics Research Centre, Moscow, Russian Federation
Kazakh-British Technical University, Almaty, Kazakhstan
Satbayev University, Almaty, Kazakhstan

Institute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan
Tomsk Polytechnic University
Prokhorov General Physics Institute of the Russian Academy of Sciences
Kazakh-British Technical University
Satbayev University

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