A5016128552- Glass properties and applications
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Optical Network Technologies
- Particle Detector Development and Performance
- Advanced Optical Sensing Technologies
- Radiation Therapy and Dosimetry
- Silicon Nanostructures and Photoluminescence
- Laser Material Processing Techniques
- Thin-Film Transistor Technologies
- Advanced Radiotherapy Techniques
- Semiconductor Lasers and Optical Devices
- Semiconductor materials and devices
- Advanced Photonic Communication Systems
- Spectroscopy and Laser Applications
- Radiation Effects in Electronics
- Ocular and Laser Science Research
- Random lasers and scattering media
- Nonlinear Optical Materials Studies
European Organization for Nuclear Research
2017-2024
Laboratoire Hubert Curien
2014-2023
Université Jean Monnet
2017-2023
Centre National de la Recherche Scientifique
2013-2022
Université Claude Bernard Lyon 1
2015-2021
Institut d’Optique Graduate School
2017
University of Palermo
2013-2014
Silica-based optical fibers, fiber-based devices and fiber sensors are today integrated in a variety of harsh environments associated with radiation constraints. Under irradiation, the macroscopic properties fibers modified through three main basic mechanisms: induced attenuation, emission refractive index change. Depending on profile use, these phenomena differently contribute to degradation performances then have be either mitigated for tolerant systems or exploited design detectors...
We report the results of several complementary radiation tests to qualify and calibrate a highly sensitive Single-Mode (SM) Optical Fiber (OF) for distributed dosimetry application at CERN. The Radiation Induced Attenuation (RIA) is physical phenomenon used evaluate Total Ionizing Dose (TID) received by OF sensor. response comprise online RIA in Near InfraRed (NIR) domain under <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">60</sup> Co γ-rays,...
We investigate the response of Ge-doped, P-doped, pure-silica, or Fluorine-doped fibers to extreme environments combining doses up MGy(SiO 2) level 10 keV X-rays and temperatures between 25 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> C 300 C. First, we evaluate their potential serve either as parts radiation tolerant optical optoelectronic systems at opposite, for most sensitive ones, punctual distributed dosimeters. Second, improve...
In this paper, we report on the development and first deployment of a distributed optical fiber radiation sensor (DOFRS) for online monitoring levels in high-energy accelerator facilities CERN. The DOFRS is composed two basic parts: set suitably chosen sensitive fibers (OFs), to be installed machine tunnel, an time domain reflectometer (OTDR), radiation-free area. We carried out calibration response P-doped multimode OF under <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
LUMINA, a fiber-based dosimeter, exploiting the radiation induced attenuation phenomenon, is operational inside International Space Station since August 2021. We discuss in this article its capability to detect possible signatures of recent solar particle events through related increase dose rate level within (ISS). Our analysis over 699 days operation shows that two LUMINA channels, operating either visible or infrared domains, are able slight flares, particular Poles regions. The South...
We report an experimental investigation on the effects of fluorine codoping radiation response Ge-doped Optical Fibers (OFs) obtained by three different drawing conditions.The OFs were irradiated with 10 keV X-rays up to 300 Mrad and studied online Radiation-Induced-Attenuation (RIA) measurements.Confocal Micro-Luminescence (CML) Electron Paramagnetic Resonance (EPR) also employed investigate permanent radiation-induced-defects. The variation Germanium-Lone-Pair-Center (GLPC)...
We report an experimental investigation on the effects of Ce-codoping in determining radiation response germanosilicate and phosphosilicate Optical Fibers (OFs) UV-Visible domain up to doses 1 MGy(SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ). show that addition Ce strongly impacts Radiation Induced Attenuation (RIA) both types fibers. In first case induced losses increase, whereas second one decrease. By combining online RIA...
We investigate the potential of innovative optical fiber bulk materials made by sol-gel technique for realtime proton beam monitoring. Those types glass are amorphous silica (a-SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) doped with either Copper (Cu) or Cerium (Ce) ions. These optimized possess very interesting light emission properties when exposed to protons. For both glasses, online monitoring strong radiationinduced...
Point or distributed optical fiber (OF)-based dosimeters can exploit the observed linear dependence of radiation-induced attenuation (RIA) at 1550 nm in phosphosilicate OFs to monitor total ionizing dose (TID). The temperature radiation sensitivity coefficients (expressed dB km <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> Gy ) three phosphorus-doped single-mode has been investigated between -80 °C and 300 for TID ranging from 1...
The Super Proton Synchrotron (SPS) is the second largest accelerator at CERN where protons are accelerated between 16 GeV/c and 450 GeV/c. Beam losses, leading to mixed-field radiation of up MGy magnitude, pose a threat reliability electronic equipment polymer materials located in tunnel its vicinity. Particularly arc sectors, both main magnets sensors periodically arranged, Total Ionizing Dose (TID) concern for front-end electronics A Logarithmic Position System (ALPS). SPS equipped with...
The O2 content and emission properties in silica nanoparticles after thermal treatments oxygen rich atmosphere have been investigated by Raman photoluminescence measurements. different sizes with average diameter ranging from 7 up to 40 nm. It is found that concentration monotonically increases size. This finding independent on the measurement technique evidences molecules are not present all volume. dependence interpreted basis of a structural model for consisting core region able host...
We applied theoretical and experimental spectroscopy tools to ad hoc silica-based "canonical" samples characterize the influence of several dopants some drawing process parameters on their radiation sensitivities. present in this paper, recent advances results occurring from our coupled approach. On side, we studied doping response optical fibers showed that changing has a negligible fiber case specialty fibers. focus mainly <formula formulatype="inline"...
Distributed optical fiber (OF) radiation sensing is a technique recently adopted at CERN for the monitoring of dose levels in proton synchrotron (PS) booster and PS. In this paper, we present progress made on our previous work by benchmarking rich information contained spatially distributed OF measurement with simulated FLUKA Monte Carlo code. We begin discussing experimental results qualification/calibration new sensitive single-mode OF, currently being deployed accelerator tunnels....
The optical-fiber-based dosimeter of the LUMINA project was deployed in August 2021 International Space Station framework Alpha mission. sensing elements are P-doped optical fibers, which were proven to be excellent candidates for dosimetry applications. twofold objective this paper is provide a theoretical model radiation response and report on experimental work carried out at CERN qualification calibration engineering dosimeter. Combining data, curve flight obtained. Finally, study...
We investigated the online radiation-induced attenuation of two single-mode optical fibers (OFs) that were X-rays irradiated with doses up to 100 kGy(SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) at room temperature 10.7 Gy/s. One samples was doped only phosphorous, whereas other codoped phosphorous and cerium. Both OF types are very radiation sensitive in near-infrared (NIR) domain interest for applications involving detection....
We investigated the behavior of a new class erbium-doped fiber amplifier (EDFA) when exposed to 63 MeV protons. The EDFA is designed with radiation hardened hole-assisted carbon coated (HACC) Er <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3 +</sup> -doped optical fiber. particular structure this HACC allows permanently incorporate an optimal amount D <sub xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> or H gases into its core, reducing...
This work focuses on the effects of high dose ionizing radiation, up to 10 MGy(SiO 2 ), P‐doped multimode optical fibers (OF) at different irradiation temperatures. The investigation is based two complementary experimental techniques: radiation‐induced attenuation (RIA) measurements and electron paramagnetic resonance (EPR). latter technique allows measuring P1, P2, metastable‐POHC stable‐POHC defects. Three OF samples are drawn from same preform evaluate influence changing their drawing...
A benchmark between various radiation monitors employed at CERN for to electronics applications and their simulated values with the FLUKA Monte Carlo is performed CHARM mixed-field irradiation facility. Comparisons are made different operational conditions, using data recorded in 2015–2018 period.
We performed electron paramagnetic resonance (EPR) measurements on γ and X ray irradiated Ge doped Ge/F co-doped optical fibers. considered three different drawing conditions (speed tension), for each type of drawing, we studied samples having doping level above 4% by weight. The EPR data recorded the fibers confirm that all exhibit a very close radiation response regardless corresponding to values used production specialty Furthermore, as materials, in F fibers, observed Ge(1) Ge(2) defects...
The effects of a high-pressure O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -loading treatment on the radiation response Ge-doped optical fibers (OFs) were investigated. We found that incorporation high concentration interstitial molecular oxygen remarkably enhances resistance to ionizing OFs in UV-Visible domain and, at same time, improves transmission UV light unirradiated OF sample. By comparison with previously reported results,...
We investigated the impact of an oxygen preloading on pure-silica-core or fluorine-doped-core fiber responses to high irradiation doses (up 1 MGy (SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> )). Oxygen enrichment was achieved through a diffusion-based technique, and long-term presence O molecules confirmed by micro-Raman experiments. Online radiation induced attenuation (RIA) experiments were carried out in both pristine -loaded...
Raman-based Distributed Temperature Sensors (RDTS) allow performing spatially resolved (1 m) reliable temperature measurements over several km long Optical Fibers (OFs). These systems are based on the dependence of intensities both Stokes and anti-Stokes components Raman back-scattered signal. One specific issues associated with RDTS technology in radiation environments is differential Radiation Induced Attenuation (RIA) between two that induces huge errors evaluation. Such problem...
We investigated the potential of a multimode (50-μm core diameter) nitrogen doped silica-based optical fiber for X-rays, protons, and y-rays radiation detection dosimetry. X-rays results confirm that this N-doped presents strong radioluminescence (RL) around 550 nm when exposed to radiation. The RL observed from few centimeter long samples linearly depend on dose rate at least in 1-mGy/s-50-Gy/s range. Low y-ray t ests demonstrate as low 40 μGy/s with 2-m-long sample. This is also associated...