26 November 2002 Irradiation tests of radiation resistance optical fibers for fusion diagnostic application
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To promote development of radiation-resistant core optical fibers, the ITER-EDA (International Thermonuclear Experimental Reactor-Engineering Design Activity) recommended carrying out international round-robin irradiation tests of optical fibers to establish a reliable database for their applications in the ITER plasma diagnostics. Ten developed optical fibers were irradiation-tested in a Co-60 gamma cell, a Japan Materials Testing Reactor (JMTR). Also, some of them were irradiation tested in a fast neutron irradiation facility of FNS (Fast Neutron Source), especially to study temperature dependence of neutron-associated irradiation effects. Included were several Japanese fluorine doped fibers and one Japanese standard fiber (purified and undoped silica core), as well as seven Russian fibers. Some of Russian fibers were drawn by Japanese manufactures from Russian made pre-form rods to study effects of manufacturing processes to radiation resistant properties. The present paper will describe behaviors of growth of radiation-induced optical transmission loss in the wavelength range of 350-1750nm. Results indicate that role of displacement damages by fast neutrons are very important in introducing permanent optical transmission loss. Spectra of optical transmission loss in visible range will depend on irradiation temperatures and material parameters of optical fibers.
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Tsunemi Kakuta, Tsunemi Kakuta, Tatsuo Shikama, Tatsuo Shikama, Takeo Nishitani, Takeo Nishitani, Shin Yamamoto, Shin Yamamoto, Shinji Nagata, Shinji Nagata, Bun Tsuchiya, Bun Tsuchiya, Kentaro Toh, Kentaro Toh, Junichi Hori, Junichi Hori, } "Irradiation tests of radiation resistance optical fibers for fusion diagnostic application", Proc. SPIE 4786, Penetrating Radiation Systems and Applications IV, (26 November 2002); doi: 10.1117/12.451742; https://doi.org/10.1117/12.451742

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