Radiation induced absorption of hydrogen-loaded pure silica optical fibers with carbon coating for ITER diagnostics

Andrei Goussarov; Konstantin Vukolov; Ilya Orlovskiy; Evgeniy N. Andreenko

doi:10.1016/j.fusengdes.2019.111356

Radiation induced absorption of hydrogen-loaded pure silica optical fibers with carbon coating for ITER diagnostics

Andrei Goussarov, Konstantin Vukolov, Ilya Orlovskiy, Evgeniy N. Andreenko

Research output › peer-review

Abstract

We present results of gamma irradiation tests of 200 μm pure silica core optical fibers with a low and high-OH concentration, with and without hydrogen loading. All the fibers were manufactured by a candidate supplier of the fiber bundles for optical plasma diagnostics in ITER. The hydrogen-loaded fibers were stored for a one year before the irradiation start. The fibers were exposed at two Co-60 gamma facilities using dose-rates of 15 and 194 mGy/s up to 15 and 70 kGy absorbed doses, respectively. The optical transmission losses of the fibers were measured in-situ in the spectral range of 450–900 nm. The results are interpreted on the basis of available data on radiation defects in silica core fibers. It is demonstrated that hydrogen loading provides a radiation hardness improvement, which allows to satisfy the ITER requirements.

Original language	English
Article number	111356
Journal	fusion engineering and design
Volume	151
DOIs	https://doi.org/10.1016/j.fusengdes.2019.111356
State	Published - 2 Feb 2020

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title = "Radiation induced absorption of hydrogen-loaded pure silica optical fibers with carbon coating for ITER diagnostics",

abstract = "We present results of gamma irradiation tests of 200 μm pure silica core optical fibers with a low and high-OH concentration, with and without hydrogen loading. All the fibers were manufactured by a candidate supplier of the fiber bundles for optical plasma diagnostics in ITER. The hydrogen-loaded fibers were stored for a one year before the irradiation start. The fibers were exposed at two Co-60 gamma facilities using dose-rates of 15 and 194 mGy/s up to 15 and 70 kGy absorbed doses, respectively. The optical transmission losses of the fibers were measured in-situ in the spectral range of 450–900 nm. The results are interpreted on the basis of available data on radiation defects in silica core fibers. It is demonstrated that hydrogen loading provides a radiation hardness improvement, which allows to satisfy the ITER requirements.",

keywords = "ITER, plasma diagnostics, Optical fibers, Radiation induced attenuation, Radiation defects, Hydroge loading",

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T1 - Radiation induced absorption of hydrogen-loaded pure silica optical fibers with carbon coating for ITER diagnostics

AU - Goussarov, Andrei

AU - Vukolov, Konstantin

AU - Orlovskiy, Ilya

AU - Andreenko, Evgeniy N.

N1 - Score=10

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N2 - We present results of gamma irradiation tests of 200 μm pure silica core optical fibers with a low and high-OH concentration, with and without hydrogen loading. All the fibers were manufactured by a candidate supplier of the fiber bundles for optical plasma diagnostics in ITER. The hydrogen-loaded fibers were stored for a one year before the irradiation start. The fibers were exposed at two Co-60 gamma facilities using dose-rates of 15 and 194 mGy/s up to 15 and 70 kGy absorbed doses, respectively. The optical transmission losses of the fibers were measured in-situ in the spectral range of 450–900 nm. The results are interpreted on the basis of available data on radiation defects in silica core fibers. It is demonstrated that hydrogen loading provides a radiation hardness improvement, which allows to satisfy the ITER requirements.

AB - We present results of gamma irradiation tests of 200 μm pure silica core optical fibers with a low and high-OH concentration, with and without hydrogen loading. All the fibers were manufactured by a candidate supplier of the fiber bundles for optical plasma diagnostics in ITER. The hydrogen-loaded fibers were stored for a one year before the irradiation start. The fibers were exposed at two Co-60 gamma facilities using dose-rates of 15 and 194 mGy/s up to 15 and 70 kGy absorbed doses, respectively. The optical transmission losses of the fibers were measured in-situ in the spectral range of 450–900 nm. The results are interpreted on the basis of available data on radiation defects in silica core fibers. It is demonstrated that hydrogen loading provides a radiation hardness improvement, which allows to satisfy the ITER requirements.

KW - ITER

KW - plasma diagnostics

KW - Optical fibers

KW - Radiation induced attenuation

KW - Radiation defects

KW - Hydroge loading

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