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6 results on '"G. Giacometti"'

1. Tungsten oxide thin film bombarded with a low energy He ion beam: evidence for a reduced erosion and W enrichment

Author

Y. Addab, P. Roubin, Martiane Cabié, Hussein Hijazi, Fred W Meyer, C. Pardanaud, Claire Martin, Bruno Domenichini, Mark E. Bannister, G. Giacometti, Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS), Centre Pluridisciplinaire de Microscopie Electronique et de Microanalyse (AMU CP2M), Aix Marseille Université (AMU), Physique des interactions ioniques et moléculaires ( PIIM ), Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] ( LICB ), Université de Technologie de Belfort-Montbeliard ( UTBM ) -Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Centre Pluridisciplinaire de Microscopie Electronique et de Microanalyse ( AMU CP2M ), Aix Marseille Université ( AMU ), Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)

Subjects
Materials science, Ion beam, thin film, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 01 natural sciences, tungsten oxide, 010305 fluids & plasmas, Low energy, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], 0103 physical sciences, Thin film, Composite material, He ion bombardment, Mathematical Physics, 010302 applied physics, electron microscopy, Tungsten oxide, [ PHYS.PHYS.PHYS-PLASM-PH ] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Condensed Matter Physics, erosion, Atomic and Molecular Physics, and Optics, 13. Climate action, Raman spectroscopy, Erosion, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], sputtering yield
Abstract

International audience; Nanocrystalline tungsten oxide (WO 3) thin films synthesized by thermal oxidation of tungsten substrates were exposed to low energy helium ions (energy: 80 eV; flux: 1.4-1.7×10 20 m-2 s-1) at room temperature and at 673 K. The structure and morphology changes of the oxide were studied using Raman spectroscopy and electron microscopy. Due to the low ion energy, no erosion is observed at room temperature. On the contrary, at 673 K, a colour change is observed and a significant erosion is measured (~ 70 nm for a fluence of ~ 4×10 21 m-2) due to a synergetic effect between ion bombardment and heating. We show that erosion processes and structural changes strongly depend on the ion fluence and in particular the higher the fluence, the lower the erosion yield, most likely due to oxygen depletion in the oxide near-surface layers.

Published
2017
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2. Preparing the future post-mortem analysis of beryllium-based JET and ITER samples by multi-wavelengths Raman spectroscopy on implanted Be, and co-deposited Be

Author

Marco Minissale, L. Ferri, G. Giacometti, M. Barrachin, Céline Martin, Martin Köppen, C. P. Lungu, M. Lungu, F. Virot, M. I. Rusu, P. Hansen, Cédric Pardanaud, Yves Ferro, Ch. Linsmeier, P. Roubin, Corneliu Porosnicu, P. Dinca, Y. Addab, National Institute of Materials Physics, Magurele-Ilfov, Romania, Aix Marseille Université (AMU), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Science et Ingénierie des Matériaux et Procédés (SIMaP ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut FRESNEL (FRESNEL), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), ILM (ILM), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), NIPNE -Bucharest-Magurele (NIPNE), NIPNE, Institut fur Energie und Klimaforschung - Plasmaphysik (IEK-4), Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Jet (fluid), Materials science, beryllium carbide, defects in beryllium, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, Wavelength, symbols.namesake, chemistry, plasma wall interaction, 0103 physical sciences, Raman spectroscopy, symbols, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Beryllium, Atomic physics, 0210 nano-technology
Abstract

International audience; This study demonstrates that Raman microscopy is a suitable technique for future $post\ mortem$ analyses of JET and ITER plasma facing components. We focus here on laboratory deposited and bombarded samples of beryllium and beryllium carbides and start to build a reference spectral databases for fusion relevant beryllium-based materials. We identified the beryllium phonon density of states, its second harmonic and E$_{2G}$ and B$_{2G}$ second harmonic and combination modes for defective beryllium in the spectral range 300-700 and 700-1300 cm$^{-1}$ , lying close to BeD modes of beryllium hydrides. We also identified beryllium carbide signature, Be$_2$C, combining Raman microscopy and DFT calculation. We have shown that, depending on the optical constants of the material probed, in depth sensitivity at the nanometer scale can be performed using different wavelengths. This way, we demonstrate that multi-wavelength Raman microscopy is sensitive to in-depth stress caused by ion implantation (down to ≈30 nm under the surface for Be) and Be/C concentration (down to 400 nm or more under the surface for Be+C), which is a main contribution of this work. The depth resolution reached can then be adapted for studying the supersaturated surface layer found on tokamak deposits.

Published
2017
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3. Multi-technique coupling for analysis of deuterium retention in carbon fiber composite NB31

Author

Cédric Pardanaud, J. Chêne, B. Pégourié, I. Beurroies, Hicham Khodja, G. Giacometti, P. Roubin, Céline Martin, E. Bernard, Loïc Marchetti, Ryuichi Sakamoto, Laboratoire d'Etudes des Eléments Légers (LEEL - UMR 3685), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), National Institute for Fusion Science (NIFS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Matériaux divisés, interfaces, réactivité, électrochimie (MADIREL), Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement (LAMBE - UMR 8587), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Université d'Évry-Val-d'Essonne (UEVE)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Service d'Etudes du Comportement des Matériaux de Conditionnement (SECM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement (LAMBE), Université Paris-Seine-Université Paris-Seine-Université d'Évry-Val-d'Essonne (UEVE)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Seine-Université Paris-Seine-Université d'Évry-Val-d'Essonne (UEVE)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Mechanical Engineering, Monte Carlo method, Analytical chemistry, Porosimetry, 01 natural sciences, Fluence, 010305 fluids & plasmas, Ion, symbols.namesake, Deuterium, Mechanics of Materials, 0103 physical sciences, symbols, [CHIM]Chemical Sciences, General Materials Science, Surface layer, Irradiation, 010306 general physics, Raman spectroscopy
Abstract

International audience; This paper presents an extensive set of measurements from complementary surface analysis techniques performed for characterizing deuterium retention in carbon fiber composite Sepcarb®NB31 subsequently to a deuterium beam exposition: adsorption isotherm measurements and Hg porosimetry to characterize the porous network, coupled deuterium beam exposure and in situ µ-NRA analysis to follow the dynamics of the penetration of the retained deuterium in the material, TEM and Raman microscopy to investigate the change in the material structure induced by ion irradiation, and finally TPD to estimate the respective proportion of deuterium retained in the surface layer and in the bulk material. The parameters extracted from this set of characterizations are introduced in a 2D Monte Carlo model which couples the propagation of deuterium and eroded carbon atoms in a network of rectilinear pores and plasma–surface interaction parameters from the SRIM code. The simulations reproduce satisfactorily the main features of the measured deuterium concentration profile and behavior of the retained deuterium amount with incident fluence, validating the physical picture of deuterium retention in CFC as due to the simultaneous implantation of the incident ions in the few 10-nm-depth layer the closest to the surface and penetration of atoms deeper in the material (several tens of microns) through the pore network

Published
2015
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4. Thermal stability and long term hydrogen/deuterium release from soft to hard amorphous carbon layers analyzed using in-situ Raman spectroscopy. Comparison with Tore Supra deposits

Author

Céline Martin, B. Pégourié, P. Roubin, Cédric Pardanaud, G. Giacometti, N. Mellet, Physique des interactions ioniques et moléculaires (PIIM), and Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Hydrogen, Analytical chemistry, FOS: Physical sciences, chemistry.chemical_element, 02 engineering and technology, Thermal treatment, Tore Supra, 7. Clean energy, 01 natural sciences, symbols.namesake, Physics - Chemical Physics, 0103 physical sciences, Materials Chemistry, Thermal stability, Absorption (electromagnetic radiation), Chemical Physics (physics.chem-ph), 010302 applied physics, Chemistry, Metals and Alloys, Amorphous carbon, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Deuterium, Raman spectroscopy, symbols, Long term hydrogen release, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Thermal stability 2, 0210 nano-technology
Abstract

The thermal stability of 200 nm thick plasma enhanced chemical vapor deposited a-C:H and a-C:D layers ranging from soft to hard layers has been studied and compared to that of deposits collected on the Tore Supra tokamak plasma facing components by means of in-situ Raman spectroscopy. Linear ramp heating and long term isotherms (from several minutes to 21 days) have been performed and correlations between spectrometric parameters have been found. The information obtained on the sp 2 clustering has been investigated by comparing the G band shift and the 514 nm photon absorption evolution due to the thermal treatment of the layer. The effects of isotopic substitution have also been investigated., Comment: appears in Thin Solid Films, Elsevier, 2014

Published
2014
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5. Plasma growth processes inside gaps of the castellated limiter of the Tore Supra tokamak

Author

R. Ruffe, Céline Martin, P. Roubin, P. Languille, B. Pégourié, Cédric Pardanaud, and G. Giacometti

Subjects
Tokamak, Materials science, Analytical chemistry, 02 engineering and technology, Tore Supra, 01 natural sciences, 010305 fluids & plasmas, Ion, law.invention, law, Electric field, 0103 physical sciences, Limiter, Composite material, Instrumentation, [PHYS]Physics [physics], Plasma, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Microstructure, Electronic, Optical and Magnetic Materials, visual_art, Physical Sciences, visual_art.visual_art_medium, Tile, 0210 nano-technology
Abstract

International audience; We performed electron microscopy analysis of carbon tiles dismantled from the toroidal limiter of the Tore Supra tokamak. The tile top surfaces are either eroded, or covered with deposits, depending on ion flux. On the contrary, the tile gap surfaces are covered with deposits whatever the region of the limiter. We analyzed both the topography and the microstructure of gap deposits. Deposits are tip-shaped and deposition is significant only down to ~1 mm, due to the limited penetration of ions. The direction of tips results from the combination of the ion speed along the magnetic lines and the drift associated to the local electric fields. The microstructure of deposits reveals the presence of graphitic species, such as onion-like nanoparticles, and our results therefore show that deposition results from local plasma chemistry similar to what is observed for cold plasmas.

Published
2011
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6. Raman study of CFC tiles extracted from the toroidal pump limiter of Tore Supra

Author

G. Giacometti, Thierry Angot, E. Aréou, Céline Martin, T. Dittmar, Wolfgang Jacob, Christian Hopf, Cédric Pardanaud, R. Ruffe, E. Tsitrone, Thomas Schwarz-Selinger, Pascale Roubin, B. Pégourié, Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Max-Planck-Institut für Plasmaphysik [Garching] (IPP)

Subjects
Nuclear and High Energy Physics, Materials science, Analytical chemistry, chemistry.chemical_element, FOS: Physical sciences, 02 engineering and technology, Tore Supra, Deuterium inventory, 01 natural sciences, symbols.namesake, Amorphous materials, Physics - Chemical Physics, 0103 physical sciences, Limiter, General Materials Science, 010306 general physics, Spectroscopy, Chemical Physics (physics.chem-ph), Condensed Matter - Materials Science, co-deposition, [SPI.PLASMA]Engineering Sciences [physics]/Plasmas, Materials Science (cond-mat.mtrl-sci), 021001 nanoscience & nanotechnology, Carbon, Amorphous solid, Redeposition, Nuclear Energy and Engineering, chemistry, Amorphous carbon, symbols, Erosion and deposition, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], 0210 nano-technology, Raman spectroscopy, Deposition (chemistry)
Abstract

International audience; The structure of six tiles extracted from the erosion and deposition zones (thin and thick deposition) of the Tore Supra toroidal pump limiter (TPL) have been analysed in the framework of the DITS campaign using micro-Raman spectroscopy. This post-mortem analysis gives information on both carbon structure and D content. We have found that the carbon structure is most often similar to that of plasma-deposited hard amorphous carbon layers. The role of the surface temperature during the discharge in the D content is investigated: in all locations where the temperature does not reach more than 500°C the D content seems to be roughly uniform with D/D+C ≈ 20%.

Published
2011
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