Characterization of the Performance of Sapphire Optical Fiber in Intense Radiation Fields, when Subjected to Very High Temperatures

Characterization of the Performance of Sapphire Optical Fiber in Intense Radiation Fields, when Subjected to Very High Temperatures

Bibliographic Details
Main Author: Petrie, Christian Matthew
Language:English
Published: The Ohio State University / OhioLINK 2014
Subjects:
Engineering
Experiments
Materials Science
Nuclear Engineering
Optics
Radiation
Sapphire
Fibers
Heated
Irradiation
Temperature
Reactor
Optical
Alumina
Al2O3
Instrumentation
Defects
Absorption
Attenuation
Transmission
In-situ
Broadband
Nuclear
Single crystal
Corundum
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1405011475
id ndltd-OhioLink-oai-etd.ohiolink.edu-osu1405011475
record_format oai_dc
collection NDLTD
language English
sources NDLTD
topic Engineering
Experiments
Materials Science
Nuclear Engineering
Optics
Radiation
Sapphire
Fibers
Heated
Irradiation
Temperature
Reactor
Optical
Alumina
Al2O3
Radiation
Instrumentation
Defects
Absorption
Attenuation
Transmission
In-situ
Broadband
Nuclear
Single crystal
Corundum
spellingShingle Engineering
Experiments
Materials Science
Nuclear Engineering
Optics
Radiation
Sapphire
Fibers
Heated
Irradiation
Temperature
Reactor
Optical
Alumina
Al2O3
Radiation
Instrumentation
Defects
Absorption
Attenuation
Transmission
In-situ
Broadband
Nuclear
Single crystal
Corundum
Petrie, Christian Matthew
Characterization of the Performance of Sapphire Optical Fiber in Intense Radiation Fields, when Subjected to Very High Temperatures
author Petrie, Christian Matthew
author_facet Petrie, Christian Matthew
author_sort Petrie, Christian Matthew
title Characterization of the Performance of Sapphire Optical Fiber in Intense Radiation Fields, when Subjected to Very High Temperatures
title_short Characterization of the Performance of Sapphire Optical Fiber in Intense Radiation Fields, when Subjected to Very High Temperatures
title_full Characterization of the Performance of Sapphire Optical Fiber in Intense Radiation Fields, when Subjected to Very High Temperatures
title_fullStr Characterization of the Performance of Sapphire Optical Fiber in Intense Radiation Fields, when Subjected to Very High Temperatures
title_full_unstemmed Characterization of the Performance of Sapphire Optical Fiber in Intense Radiation Fields, when Subjected to Very High Temperatures
title_sort characterization of the performance of sapphire optical fiber in intense radiation fields, when subjected to very high temperatures
publisher The Ohio State University / OhioLINK
publishDate 2014
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1405011475
work_keys_str_mv AT petriechristianmatthew characterizationoftheperformanceofsapphireopticalfiberinintenseradiationfieldswhensubjectedtoveryhightemperatures
_version_ 1719436548885184512
spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu14050114752021-08-03T06:25:46Z Characterization of the Performance of Sapphire Optical Fiber in Intense Radiation Fields, when Subjected to Very High Temperatures Petrie, Christian Matthew Engineering Experiments Materials Science Nuclear Engineering Optics Radiation Sapphire Fibers Heated Irradiation Temperature Reactor Optical Alumina Al2O3 Radiation Instrumentation Defects Absorption Attenuation Transmission In-situ Broadband Nuclear Single crystal Corundum The U.S. Department of Energy is interested in extending optically-based instrumentation from non-extreme environments to extremely high temperature radiation environments for the purposes of developing in-pile instrumentation. The development of in-pile instrumentation would help support the ultimate goal of understanding the behavior and predicting the performance of nuclear fuel systems at a microstructural level. Single crystal sapphire optical fibers are a promising candidate for in-pile instrumentation due to the high melting temperature and radiation hardness of sapphire. In order to extend sapphire fiber-based optical instrumentation to high temperature radiation environments, the ability of sapphire fibers to adequately transmit light in such an environment must first be demonstrated. Broadband optical transmission measurements of sapphire optical fibers were made in-situ as the sapphire fibers were heated and/or irradiated. The damage processes in sapphire fibers were also modeled from the primary knock-on event from energetic neutrons to the resulting damage cascade in order to predict the formation of stable defects that ultimately determine the resulting change in optical properties.Sapphire optical fibers were shown to withstand temperatures as high as 1300 °C with minimal increases in optical attenuation. A broad absorption band was observed to grow over time without reaching a dynamic equilibrium when the sapphire fiber was heated at temperatures of 1400 °C and above. The growth of this absorption band limits the use of sapphire optical fibers, at least in air, to temperatures of 1300 °C and below. Irradiation of sapphire fibers with gamma rays caused saturation of a defect center located below 500 nm, and extending as far as ~1000 nm, with little effect on the transmission at 1300 and 1550 nm. Increasing temperature during gamma irradiation generally reduced the added attenuation.Reactor irradiation of sapphire fibers caused an initial rapid increase in attenuation, followed by a linear increase with continued irradiation time at constant reactor power. The linear increases were a result of displacement damage, and the rate of increase was proportional to the neutron flux. The transmission of sapphire fibers at 1300 and 1550 nm in a reactor radiation environment would ultimately be limited by the growth of low wavelength defect centers, whose tails extend into the near infrared. A model was proposed for the reactor radiation-induced attenuation that involves three previously reported color centers. The model accounts for gamma radiation-induced ionization of pre-existing defects, generation of new defects via displacement damage, and conversion between defect centers via ionization and charge recombination. Heated reactor irradiation experiments showed that the rate of increase of the added attenuation during constant power reactor irradiation monotonically decreases with increasing temperature up to 1000 °C, with the most significant decrease occurring between 300 and 600 °C. Testing of sapphire fiber-based sensors under irradiation at high temperatures is recommended as future work, along with advanced life irradiation testing, for example in the Advanced Test Reactor or the High Flux Isotope Reactor. 2014-10-10 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1405011475 http://rave.ohiolink.edu/etdc/view?acc_num=osu1405011475 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

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