1. Phosphosilicate Multimode Optical Fiber for Sensing and Diagnostics at Inertial Confinement Fusion Facilities
- Author
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Philippe Paillet, Sylvain Girard, Vincent Goiffon, O. Duhamel, Adriana Morana, Damien Lambert, Vincenzo De Michele, Cosimo Campanella, Gilles Melin, Thierry Robin, Jeoffray Vidalot, Arnaud Meyer, Aziz Boukenter, Youcef Ouerdane, Emmanuel Marin, Vladimir Yu. Glebov, Gregory Pien, Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), CEA DAM ILE-DE-FRANCE - Bruyères-le-Châtel [Arpajon] (CEA DAM IDF), Laboratoire Hubert Curien (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), iXBlue Photonics, Laboratory for lasers energetics - LLE (New-York, USA), and University of Rochester [USA]
- Subjects
[SPI]Engineering Sciences [physics] ,Radiation-induced attenuation (RIA) ,Autre ,Dosimetry ,Fusion, neutrons ,Radiation effects ,Optical fibers ,Electrical and Electronic Engineering ,Instrumentation - Abstract
We characterized the radiation response in the visible domain of a new multimode graded-index (GI) phosphosilicate optical fiber (GIMMF), exposed to the harsh environment (pulses of 14-MeV neutrons, X-rays, and γ -rays) associated with laser experiments at the OMEGA facility. The growth of permanent radiation-induced attenuation (RIA) was measured in situ after a series of laser shots involving a large production of 14-MeV neutrons (yields > 10^14 n per shot). RIA linearly increases with accumulated neutron fluence without recovery between shots. The obtained results allow a precise evaluation of this GIMMF vulnerability when implemented as part of laser or plasma diagnostics. Our work also reveals the potential of this class of optical fiber to serve as a radiation monitor in the radiation-rich mixed environments of megajoule class laser facilities and to provide a very fast and online estimation of the accumulated deposited dose at various locations of their experimental halls. In our experimental test configuration at OMEGA, 14-MeV neutrons are estimated to contribute to about 55% of the total deposited dose on the fibers, and the other optical losses are related to X-ray and γ -ray contributions. Those measurements could be, for example, benchmarked to the radiation maps obtained by Monte Carlo simulation tools, potentially facilitating the evaluation of the aging of diagnostics, components, and systems as well as their maintenance operations.
- Published
- 2022