A5030342332- Fusion materials and technologies
- Metal and Thin Film Mechanics
- Nuclear Materials and Properties
- Magnetic confinement fusion research
- Chalcogenide Semiconductor Thin Films
- Ion-surface interactions and analysis
- ZnO doping and properties
- Phase-change materials and chalcogenides
- Diamond and Carbon-based Materials Research
- Magnetic properties of thin films
- Glass properties and applications
- Plasma Diagnostics and Applications
- Intermetallics and Advanced Alloy Properties
- High-Temperature Coating Behaviors
- Inorganic Chemistry and Materials
- Analytical chemistry methods development
- Advanced materials and composites
- Surface Roughness and Optical Measurements
- Advanced Sensor Technologies Research
- Microstructure and Mechanical Properties of Steels
- Molten salt chemistry and electrochemical processes
- Nonlinear Optical Materials Studies
- Nuclear materials and radiation effects
- Copper Interconnects and Reliability
- Nuclear reactor physics and engineering
National Institute for Laser Plasma and Radiation Physics
2009-2023
Laboratoire de Physique des Lasers, Atomes et Molécules
2010-2019
Centre National de la Recherche Scientifique
2010-2019
Université de Lille
2019
Data on erosion and melting of beryllium upper limiter tiles, so-called dump plates (DP), are presented for all three campaigns in the JET tokamak with ITER-like wall. High-resolution images wall show clear signs flash ridge roof-shaped tiles. The melt layers move poloidal direction from inboard to outboard tile, ending last DP tile an upward going waterfall-like structure. Melting was caused mainly by unmitigated plasma disruptions. During ILW campaigns, around 15% 12376 pulses were...
Abstract The Joint European Torus (JET) fusion reactor was upgraded to the metallic wall configuration in 2011 which consisted of bulk beryllium (Be) tiles main chamber and tungsten (W) W-coated CFC divertor (Matthews G.F. et al Phys. Scr. T148 014001). During each campaign, a series damages were observed; on upper dump plates (UDP) positioned top part vessel walls inner wall—mainly affecting guard limiters (IWGL). In both cases, it concluded that causes these unmitigated plasma disruptions....
JET components are removed periodically for surface analysis to assess material migration and fuel retention. This paper describes issues related handling procedures preparing samples analysis; in particular a newly developed procedure cutting beryllium tiles is presented. Consideration also given the hazards likely due increased tritium inventory activation from 14 MeV neutrons following planned TT DT operations (DTE2) 2017. Conclusions drawn as feasibility of post DTE2.
Beryllium oxide (BeO) and deuteroxide (BeOxDy) have been found on the melted zone of a beryllium tile extracted from upper dump plate JET-ILW (2011–2012 campaign). Results obtained using Raman microscopy, which is sensitive to both chemical bond crystal structure, with micrometric lateral resolution. BeO wurtzite structure. BeOxDy as three different types are not β-phase but behaves molecular species like Be(OD)2, O(Be-D)2 DBeOD. The presence small amount trapped D2O also suspected. Our...
Ge-Sb-Te thin films were obtained by ns-, ps-, and fs-pulsed laser deposition (PLD) in various experimental conditions. The thickness of the samples was influenced Nd-YAG wavelength, fluence, target-to-substrate distance, time. topography chemical analysis results showed that deposited ns-PLD revealed droplets on surface together with a decreased Te concentration Sb over-stoichiometry. Thin improved roughness compositions close to nominal values ps- fs-PLD. X-ray diffraction Raman...
We report for the first time on ability of Raman microscopy to give information structure and composition Be related samples mimicking plasma facing materials that will be found in ITER. For purpose, we investigate two types material. First: Be, W, Be1W9, Be5W5 deposits containing a few percents D or N, second: Mo mirror exposed main JET chamber (in framework test with ITER-like wall). performed atomic quantifications using ion beam analysis samples. also did force microscopy. defect induced...
Nano-structured C-Ni coatings were prepared using the thermionic vacuum arc method and tribological properties evaluated in order to obtain carbon-metal layers act as solid lubricants. The films by TVA characterised a metallic complex of nano-crystals (5 nm average diameter) surrounded carbon amorphous structures with strong graphitisation tendency. coefficients friction coatings, measured CSM ball-on-disc tribometer, range 0.19-0.27 3-5 times lower than uncoated substrates.
Beryllium-deuterium co-deposited layers were obtained using DC magnetron sputtering technique by varying the Ar/D2 gas mixture composition (10/1; 5/1; 2/1 and 1:1) at a constant deposition rate of 0.06 nm/s, 343 K substrate temperature 2 Pa pressure. The surface morphology was analyzed Scanning Electron Microscopy layer crystalline structure X-ray diffraction. Rutherford backscattering spectrometry employed to determine chemical layers. D trapping states inventory quantification performed...
Formation of Be-W mixed layers in thermonuclear fusion reactors can potentially alter the retention hydrogen isotopes and affect release properties these isotopes. This paper reports on characteristics D from reference Be, W as well three with well-defined atomic concentrations (2:1, 1:1, 1:2). The resulted sputtering Be materials Ar:D (1:1) mixture at 2 Pa using DC magnetron sputtering. layers’ deposition parameters were varied to adjust accordingly rate for each material order obtain...
A model of the strain accumulation in nitrogen implanted polycrystalline tungsten films deposited on 110 single-crystalline silicon substrates is presented. The films, with nominal thickness 500 nm, were at room temperature, a direction perpendicular to sample surface an energy 60 keV N2+ ions and concentrations between 0.5 × 1017/cm2 5 1017/cm2. proposed based simulations X-ray diffraction 2θ-ω scans vicinities W most intense Bragg peak. Up fluence 2 1017/cm2, increase asymmetry towards...
Deuterium retention and release behavior were investigated in this study, for thin layers of beryllium, tungsten mixed beryllium/tungsten which are concern next-generation thermonuclear fusion devices like International Thermonuclear Experimental Reactor. The resulted from deposition with Thermionic Vacuum Arc technology by using two different ion acceleration voltages 0 V -700 respectively subsequently implanted exposure to a steady-state deuterium plasma energies 240 eV/D D3 360 D2 at...
Our contribution represents the study of deuterium thermal release from beryllium and oxide substrates implanted by an ion plasma torch at different loads two temperatures. The Be Bulk samples (12x15 cm) were processed to obtain best possible implantation surface. subsequently exposure a steady state D using 240 eV/D low flux 5.6×1017m-2s. Scanning electron microscopy measurements performed after sample irradiation revealed apparition grain-like structures due plasma-facing on Be. Also,...
Co-MgO granular films presenting TMR effects were prepared by thermo-ionic vacuum arc (TVA) method with the simultaneous ignition of plasma in Co and MgO vapors, respectively. The processing is suitable for preparation different relative content insulating matrix. Morphologic, structural magnetic behaviors analyzed as annealed samples. influence on properties was analyzed, correlation tunneling magneto-resistance effects. effect maximal certain content. This behavior interpreted contrary...
Reduced activation ferritic and martensitic steel like EUROFER (9Cr-1W) are considered as potential structural materials for the first wall of future next-generation DEMOnstration Power Station (DEMO) fusion reactor a reference material International Thermonuclear Experimental Reactor (ITER) test blanket module. The primary motivation this work is to study re-deposition main constituent EUROFER, namely tungsten (W), iron (Fe), chromium (Cr), in DEMO type by producing analyzing complex...
Compact and defect-free high melting point oxide strengthened metallic matrix configurations are promising to resolve the hydrogen permeation brittleness issues relevant fusion research community. Previous studies on addition demonstrated a mitigation in behavior, while deposition techniques material still be investigated. Thus, here, we report structural, morphological, mechanical characterization of metal-oxides thin layers co-deposited by radio frequency (RF)and direct current (DC)...
Direct current (DC) and radio frequency (RF) magnetron sputtering methods were selected for conducting the deposition of structural materials, namely ceramic metallic co-depositions. A total six configurations deposited: single thin layers oxides (Cr2O3, SiO2) co-deposition (50:50 wt.%) as materials (W, Be)-(Cr2O3, SiO2), all deposited on 304L stainless steel (SS). comprehensive evaluation such surface topology, thermal desorption outgassing, structural/chemical state was performed....
Fe-B based compounds are of high interest due to their special properties and the wide range involved applications. While B is element that facilitates increase in hardness degree wear resistance, it also an effective glass former, controlling formation a much-desired amorphous structure with specific magnetic properties. Major difficulties related proper engineering thin films lay especially preparation under well-defined compositions, which turn, should be accurately determined. The...