Vulnerability Analysis of Optical Fibers for Laser Megajoule Facility: Preliminary Studies

Abstract : The Laser Megajoule project is a major component of the French simulation program to study nuclear fusion by inertial confinement. The future Laser Megajoule facility requires control-command systems that will operate in a harsh radiative environment. Commercial off-the-shelf optical fiber data links are envisaged as a radiation tolerant solution for this application. In this paper, we present our preliminary study of their vulnerability. For this, we firstly have used an original method consisting of ultraviolet ( 5 eV) exposures of the fibers to identify the different germanosilicate optical fibers containing phosphorus, which leads them unacceptable for both steady state -rays and successive pulsed X-ray irradiations. We have demonstrated the validity of the -UV comparison by spectroscopic measurements. After this first selection, we have tested under pulsed X-rays (dose rate > 10 MGy/s dose 0 5 < kGy) the resistance of the P-free optical fibers at 1310 nm for the shortest times after an ionization pulse (10-9 to 10-1 s). Based on these results, we discuss the validity of the optical fiber data links for the control-command applications in LMJ facility.
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Submitted on : Wednesday, March 18, 2009 - 6:32:20 PM
Last modification on : Wednesday, July 25, 2018 - 2:05:31 PM

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Sébastien Girard, J. Baggio, J. L. Leray, J.-P. Meunier, A. Boukenter, et al.. Vulnerability Analysis of Optical Fibers for Laser Megajoule Facility: Preliminary Studies. IEEE Transactions on Nuclear Science, Institute of Electrical and Electronics Engineers, 2005, 52 (5), pp.1497-1503. ⟨ujm-00369245⟩

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