Explanipedia

Assessment of Neutron Radiation Effects on the Fiber Optics Current Sensor Performance During JET DTE2 Experimental Campaign Open

A. Gusarov, P. Beaumont · 2025

Fibre Optics Current Sensor (FOCS) will be used at ITER to perform plasma current measurement during quasi-steady state D-T plasma operation. Effects of the tokamak harsh environment on the FOCS performance must be evaluated to predict pos…

Overview of Radiation Effects on Silica-Based Optical Fibers and Fiber Sensors Open

Sylvain Girard, Jochen Kuhnhenn, A. Gusarov, Adriana Morana, Philippe Paillet , et al. · 2024

International audience

EUROfusion contributions to ITER nuclear operation Open

X. Litaudon, U. Fantz, R. Villari, V. Toigo, Marie-Hélène Aumeunier , et al. · 2024

ITER is of key importance in the European fusion roadmap as it aims to prove the scientific and technological feasibility of fusion as a future energy source. The EUROfusion consortium of labs within Europe is contributing to the preparati…

Performance Enhancement of the Polarimetric Fibre Optical Current Sensor at JET Using Polarisation Optimisation Open

A. Gusarov, P. Beaumont, P. Sirén · 2024

To achieve optimal operation of the polarimetry-based FOCS, the light polarisation state at the input of the sensing fibre part must be close to a linear one. In the case of a FOCS deployed on a tokamak, the Joint European Torus (JET) in t…

Distributed Poloidal Magnetic Field Measurement in Tokamaks Using Polarization-Sensitive Reflectometric Fiber Optic Sensor Open

Prasad Dandu, A. Gusarov, Willem Leysen, P. Beaumont, Marc Wuilpart · 2023

Determination of the poloidal magnetic field distribution in tokamaks is of prime importance for the successful operation of tokamaks. In this paper, we propose a polarization-sensitive reflectometry-based optical fiber sensor for measurin…

Neutronics Simulations for DEMO Diagnostics Open

R. Luís, Yohanes Nietiadi, A. Quercia, Alberto Vale, J.H. Belo , et al. · 2023

One of the main challenges in the development of a plasma diagnostic and control system for DEMO is the need to cope with unprecedented radiation levels in a tokamak during long operation periods. A list of diagnostics required for plasma …

Temperature and RH response of polymer CYTOP FBG treated by gamma radiation Open

Ivan Chapalo, A. Gusarov, Karima Chah, Andreas Ioannou, Andreas Pospori , et al. · 2023

<p>Polymer fiber Bragg grating (FBGs) demonstrate a wider strain range and stronger temperature sensitivity compared to standard silica FBGs. Besides, their advantageous feature is sensitivity to humidity that enables FBG-based relat…

Assessment of the Structural Vibration Effect on Plasma Current Measurement Using a Fiber Optic Current Sensor in ITER Open

Sung-Moon Kim, PrasadaRaju Dandu, A. Gusarov, Alessandro Danisi, G. Vayakis , et al. · 2023

In this paper, we assess the effect of cryostat bridge vibrations on the plasma current measurement accuracy when using a fiber optic current sensor (FOCS) in ITER. The impact of vibrations on the light polarization state was first experim…

Gamma-radiation enhancement of sensing properties of FBGs in a few-mode polymer CYTOP fiber Open

Ivan Chapalo, Karima Chah, A. Gusarov, Andreas Ioannou, Andreas Pospori , et al. · 2023

We investigate the effect of γ -radiation on temperature (T) and relative humidity (RH) sensitivities of polymer perfluorinated fiber Bragg gratings (FBGs). To this aim, different γ -radiation doses (80, 120, 160, and 520 kGy) were applied…

Online Gamma Radiation Monitoring Using Few-Mode Polymer CYTOP Fiber Bragg Gratings Open

Ivan Chapalo, A. Gusarov, Andreas Ioannou, Andreas Pospori, Karima Chah , et al. · 2022

We investigated the gamma radiation response of fiber Bragg gratings (FBGs) inscribed in a few-mode polymer optical fiber. The fiber had a graded-index CYTOP core of 20 µm and XYLEX overclad of 250 µm in diameter. Four FBGs were exposed to…

Gamma radiation response of FBG inscribed in 20-μm core graded-index polymer CYTOP fiber Open

Ivan Chapalo, A. Gusarov, Andreas Ioannou, Karima Chah, Andreas Pospori , et al. · 2022

We investigate online response of a fiber Bragg grating (FBG) inscribed in a polymer optical fiber on gamma radiation. The fiber had a 20-μm graded-index CYTOP core and 250-μm XYLEX overclad. The FBG was inscribed by fs laser using the pla…

Structural and optical changes in silica-based optical fibers exposed to high neutron and gamma fluences Open

Adriana Morana, G. Cheymol, I. Reghioua, A. Boukenter, Michel L. Schlegel , et al. · 2021

In-situ gamma irradiation testing of radiation hardened chips till 1 MGy Open

D. Geys, Ying Cao, Marco Van Uffelen, Laura Mont Casellas, L. Vermeeren , et al. · 2021

Ten samples of a custom tailored Mega-Gray hardened resolver/LVDT-to-digital converter, a resistive base sensor-to-digital converter and a RS485 communication application specific integrated circuit (ASIC) were combined in 1 irradiation ca…

Long-term Transmission Characteristics of CYTOP Fiber Exposed to Gamma Radiation Open

Ivan Chapalo, A. Gusarov, Damien Kinet, Karima Chah, Ying-Gang Nan , et al. · 2021

We investigated post-irradiation variations of the radiation induced attenuation (RIA) of polymer perfluorinated (CYTOP) optical fiber exposed to gamma radiation. The RIA measured five months after the irradiation was qualitatively similar…

Monitoring the temperature of reactor experiments using radiation-induced swelling in SiC Open

A. Gusarov, K. L. Davis, J. Vande Pitte, Brenden Heidrich, I. Uytdenhouwen , et al. · 2020

Evaluation of Low Dose Silicon Carbide Temperature Monitors Open

K. L. Davis, A. Gusarov, Troy Unruh, P. Calderoni, Brenden Heidrich , et al. · 2020

Thermocouples are generally used to provide real-time temperature indications in instrumented tests performed at materials and test reactors. Melt wires or paint spots are often included in such tests as an independent technique of detecti…

Characterization of β-Silicon Carbide and Potential Use as Irradiation Temperature Monitor Open

J. Vande Pitte, Christophe Detavernier, Johan Lauwaert, I. Uytdenhouwen, A. Gusarov , et al. · 2019

Post-irradiation data on the neutron-induced swelling behaviour and resistivity changes in silicon carbide often does not show a clear trend. This makes a quantitative comparison between different studies difficult. To address the divergin…

CYTOP Fibre Bragg Grating Sensors for Harsh Radiation Environments Open

Christian Broadway, Damien Kinet, Antreas Theodosiou, Kyriacos Kalli, A. Gusarov , et al. · 2019

We present a polymer fibre Bragg grating sensor and its sensitivity to gamma radiation by observing the reflected spectral profile. The Bragg grating is femtosecond inscribed within a perfluorinated CYTOP fibre and the alteration of the Br…

Set-up for post-irradiation determination of temperature during nuclear reactor exposure with 3C-SiC Open

Geert Cornelis, J. Vande Pitte, I. Uytdenhouwen, A. Gusarov, Christophe Detavernier , et al. · 2019

Research reactors currently rely on thermocouples for accurate temperature measurements in instrumented rigs. However, a lot of irradiations are carried out in lower cost instrumented capsules without instrumentation where thermocouples ar…

Effect of Faraday mirror imperfections in a fiber optic current sensor dedicated to ITER Open

Doğuş Karabulut, Anton Miazin, A. Gusarov, P. Moreau, Willem Leysen , et al. · 2018

Study of Fiber Bragg Grating Samples Exposed to High Fast Neutron Fluences Open

G. Cheymol, Laurent Remy, A. Gusarov, Damien Kinet, Patrice Mégret , et al. · 2018

International audience

Measurement of plasma current in Tokamaks using an optical fibre reflectometry technique Open

Marc Wuilpart, Willem Leysen, A. Gusarov, P. Moreau, Patrice Mégret · 2018

An optical time-domain reflectometer sensitive to the polarization of light is proposed for the measurement of plasma current in the Tore Supra fusion reactor. The measurement principle relies on the Faraday effect i.e. on the generation o…

Test of Fibre Bragg Gratings samples under High Fast Neutrons Fluence Open

G. Cheymol, Laurent Remy, A. Gusarov, Damien Kinet, Patrice Mégret , et al. · 2018

Optical fibre sensors (OFS) are worthy of interest for measurements in nuclear reactor thanks to their unique features, particularly compact size and remote multi-point sensing for some of them. But besides non negligible constraints assoc…

Proof of Concept for Temperature and Strain Measurements With Fiber Bragg Gratings Embedded in Supercontainers Designed for Nuclear Waste Storage Open

Damien Kinet, Karima Chah, A. Gusarov, A. Faustov, Lou Areias , et al. · 2016

The Belgian Agency for Radioactive Waste and Enriched Fissile Materials (ONDRAF/NIRAS) is developing a conceptual design for a supercontainer made of concrete and carbon steel for the post-conditioning of high-level nuclear waste prior to …

The study of temperature and radiation induced degradation of cable polymers: A comparison between the mechanical properties of industrial and neat EPDM Open

Tamara Sarac, Nicolas Quiévy, A. Gusarov, M.J. Konstantinović · 2016

The mechanical properties of industrial and neat Ethylene Propylene Diene Monomer (EPDM) polymers, aged under γ-irradiation at different temperatures, are studied. The focus is given to the dose rate effects in polymer insulation materials…

Application of phosphate doped fibers for OFDR dosimetry Open

A. Faustov, A. Gusarov, Patrice Mégret, Marc Wuilpart, A. V. Zhukov , et al. · 2016

Reverse Osmosis Desalination by Hybrid Photovoltaic/Thermal Solar Systems (PV/T-RO) – Current Status Open

Alexander Präbst, A. Kroiß, M. Spinnler, A. Gusarov, Suleiman Halasah , et al. · 2015

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