| Autor: |
Kashaykin, P. F., Tomashuk, A. L., Vasiliev, S. A., Britskiy, V. A., Ignatyev, A. D., Ponkratov, Yu. V., Kulsartov, T. V., Samarkhanov, K. K., Gnyrya, V. S., Zarenbin, A. V., Semjonov, S. L. |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Nuclear Science; Oct2020, Vol. 67 Issue 10, p2162-2171, 10p |
| Abstrakt: |
Radiation-induced attenuation (RIA) at a wavelength of λ = 1.55 μm as well as the RIA spectra were investigated in optical fibers during and after irradiation at the IVG.1M nuclear reactor (Republic of Kazakhstan). The fibers studied were single mode at λ = 1.55μm, had an undoped silica core and an-F-doped silica cladding [pure-silica fibers (PSFs)], and were provided by different manufacturers. In addition to five PSFs, a single-mode revolver hollow-core fiber was also studied. The PSFs had different coating materials: polyimide, copper, or aluminum. All fibers were exposed to three runs of reactor irradiation at enhanced temperature (155–355 °C) so that by the end of the third run, the fast-neutron fluence amounted to Φ = 4.46 ⋅ 1017 n/cm2 and γ-dose to D = 2.91 ⋅107 Gy. The total induced loss at λ = 1.55μm was found to be composed of 1) RIA, 2) bending loss (BL), caused by thermal expansion of the copper cylinder the PSFs were wound on, and 3) thermo-induced microbending loss (ML) in Cu-coated PSFs. At the end of the irradiation campaign, the net RIA in PSFs proved to lie in the interval of 0.12–0.16 dB/m, which appears to be admissible to intrareactor transport fibers. It was confirmed that long-wavelength RIA tail is the only RIA origin at λ = 1.55μm in PSFs in such strong radiation fields. The hollow-core fiber was found to feature zeroth RIA throughout the campaign. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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