Abstract
In the final objective of elaborating an optical sensor
of dimensional change in a nuclear testing reactor, we present extreme
high level irradiation tests, up to 1 3 1020 nfast cm2 and
16GGy, conducted on high purity silica and hollow core photonic
bandgap (PBG) fibers. These tests are performed in the OSIRIS reactor
at CEA Saclay.We measure continuously Radiation Induced
Absorption (RIA), at 3 optical wavelengths: 980 nm, 1064 nm and
1310 nm. The evolution with the time of the spectral dependency
over larger wavelength range is also reported. As well as reporting
RIA up to higher dose than presented before, we demonstrate here
the excellent superiority of hollow core PBG fibers over their conventional
counterparts in term of radiation resistance up to over
1020 nfast cm2 and 10GGy. We also report some Optical Time
Domain Reflectometry (OTDR) measurements that probe the irradiated
parts of the fibers and showa back scattering peak which appears,
widens spatially then duplicates. We provide an interpretation
based on the change of silica when it turns to metamict phase.
Original language | English |
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Pages (from-to) | 2252-2258 |
Journal | IEEE transactions on nuclear Science |
Volume | 55 |
Issue number | 4 |
DOIs | |
State | Published - Aug 2008 |