By Topic

Comparative study of pulsed X-ray and γ-ray radiation-induced effects in pure-silica-core optical fibers

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)

We have investigated the variation of the optical absorption induced by pulsed (dose rate ≫ 108 rad/s) and continuous (≪ 50 rad/s) γ-ray exposures in pure-silica-core optical fibers. Tested multimode waveguides, designed with well-defined concentrations of hydroxyl groups and chlorine impurity, are possible candidates for integration in the plasma diagnostics of LMJ and ITER facilities. We evaluated their radiation-tolerance to low dose levels (≪ 5×104 rad) in the visible and near-infrared parts of the spectrum. We measure the time dependent changes (10-9 -10-1 s) of the radiation-induced attenuation (RIA) at fixed wavelengths and we complete these measurements with a spectral (450-1100 nm) analysis of these losses in the time range from 10-2 to 103 s. We compared the responses obtained under transient exposures with measurements done at same dose levels (5×103 rad) with lower dose rate (≪102 rad/s). We showed that the radiation-induced changes are strongly dose rate dependent for this kind of optical fibers. Depending on the hydroxyl group concentration in the silica-glass, different point defects are shown to alter the fiber transmission after both irradiation types. The self-trapped holes play a particular role in the transient responses of optical fibers whereas non-bridging oxygen hole centers are mainly responsible for γ-ray radiation-induced losses. The consequences of these different behaviors for the integration of optical fibers in the LMJ are discussed.

Published in:

Radiation and Its Effects on Components and Systems, 2005. RADECS 2005. 8th European Conference on

Date of Conference:

19-23 Sept. 2005