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Proceedings Paper

Development of optical components for in-vessel viewing systems used for fusion experimental reactor
Author(s): Kenjiro Obara; Satoshi Kakudate; Kiyoshi Oka; Eisuke Tada; Yosuke Morita; Masahiro Seki
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Paper Abstract

Optical components including imagefiber, periscope, glass, reflecting mirror and adhesive for lens are essential elements of in-vessel viewing system use for fusion experimental reactor and extensive of gamma irradiation tests have been conducted. These components were irradiated in the range of 1 MGy - 100 MGy under the average exposure dose rate of 1 X 106 R/h. As a result, the observation limit of the imagefiber specially fabricated for radiation hard is obtained to be 12 MGy at a illuminance of 8500 lx. Deterioration of transmissivity of three kinds of glass (alkaline barium glass, lead glass and synthetic quartz glass) is small compared with standard glass for commercial periscope. A periscope which was made of these glasses is visible even after 20 MGy at 8500 lx and in case of the standard periscope, the observation limit is 1 kGy at 8500 lx. Decrease in the reflectance on chromium nitride coated reflecting mirror is extremely small than aluminum coated and platinum coated mirrors at accumulated dose of 100 MGy. Two types of adhesive made of polyester resin and epoxy resin became discolored and exfoliated after 50 MGy.

Paper Details

Date Published: 30 December 1994
PDF: 8 pages
Proc. SPIE 2425, Optical Fibre Sensing and Systems in Nuclear Environments, (30 December 1994); doi: 10.1117/12.198630
Show Author Affiliations
Kenjiro Obara, Naka Fusion Research Establishment (Japan)
Satoshi Kakudate, Naka Fusion Research Establishment (Japan)
Kiyoshi Oka, Naka Fusion Research Establishment (Japan)
Eisuke Tada, Naka Fusion Research Establishment (Japan)
Yosuke Morita, Takasaki Radiation Chemistry Research Establishment (Japan)
Masahiro Seki, Naka Fusion Research Establishment (Japan)

Published in SPIE Proceedings Vol. 2425:
Optical Fibre Sensing and Systems in Nuclear Environments
Roger Van Geen; Francis Berghmans; Marc C. Decreton, Editor(s)

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