Optical characteristics of aluminum coated fused silica core fibers under 14 MeV fusion neutron irradiation

K. Toh, T. Shikama, Shinji Nagata, B. Tsuchiya, T. Suzuki, K. Okamoto, N. Shamoto, M. Yamauchi, T. Nishitani

Research output: Contribution to journalConference articlepeer-review

16 Citations (Scopus)


The optical properties of Al-coated fused silica core optical fibers were observed under 14 MeV fast neutrons irradiation with samples pre-annealed at 150 and 300 °C. With the pre-annealing treatment, the optical absorption could be decreased except for the Si-OH (1390 nm). Under fast neutron irradiation, the radiation-induced transmission loss of pre-annealed fiber at 150 °C was over five times larger than that annealed at 300 °C. It is believed that the precursors of optical absorption were decreased by the annealing treatment. Under irradiation, the optical absorption at 1390 nm had characteristic changes. The absorption at 1390 nm was small during the irradiation and became large once the irradiation stopped. This behavior was only observed for the 1390 nm absorption. It is believed that the increase of the transmission loss under irradiation was caused by the atomic displacement by fast neutrons of Si-OHs and that the displaced Si-OHs recovered when the irradiation stopped.

Original languageEnglish
Pages (from-to)1495-1498
Number of pages4
JournalJournal of Nuclear Materials
Issue number1-3 PART B
Publication statusPublished - 2004 Aug 1
EventProceedings of the 11th Conference on Fusion Research - Kyoto, Japan
Duration: 2003 Dec 72003 Dec 12

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering


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