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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Martin, Céline
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2022Optical Properties of Tungsten: A Parametric Study to Characterize the Role of Roughness, Surface Composition and Temperaturecitations
- 2022Optical Properties of Tungsten: A Parametric Study to Characterize the Role of Roughness, Surface Composition and Temperaturecitations
- 2018Single-crystal and polycrystalline diamond erosion studies in Pilot-PSIcitations
- 2017Advanced spectroscopic analyses on a:C-H materials: Revisiting the EELS characterization and its coupling with multi-wavelength Raman spectroscopycitations
- 2017Tungsten oxide thin film bombarded with a low energy He ion beam: evidence for a reduced erosion and W enrichmentcitations
- 2017Tungsten oxide thin film exposed to low energy He plasma: Evidence for a thermal enhancement of the erosion yieldcitations
- 2016Study of the pores inside tungsten coating after thermal cycling for fusion devicecitations
- 2015In-plane and out-of-plane defects of graphite bombarded by H, D and He investigated by atomic force and Raman microscopiescitations
- 2015Multi-technique coupling for analysis of deuterium retention in carbon fiber composite NB31citations
- 2014Multiwavelength Raman spectroscopy analysis of a large sampling of disordered carbons extracted from the Tore Supra tokamakcitations
- 2014Thermal stability and long term hydrogen/deuterium release from soft to hard amorphous carbon layers analyzed using in-situ Raman spectroscopy. Comparison with Tore Supra depositscitations
- 2014Raman microscopy as a defect microprobe for hydrogen bonding characterization in materials used in fusion applicationscitations
- 2013Raman spectroscopy investigation of the H content of heated hard amorphous carbon layerscitations
- 2013Long Term H-Release from Amorphous Carbon Evidenced by in Situ Raman Microscopy under Isothermal Heatingcitations
- 2013Simultaneous deuterium implantation and ion beam microanalyses in CFC NB31: Understanding the in-bulk migrationcitations
- 2012Raman micro-spectroscopy as a tool to measure the absorption coefficient and the erosion rate of hydrogenated amorphous carbon films heat-treated under hydrogen bombardmentcitations
- 2011Raman study of CFC tiles extracted from the toroidal pump limiter of Tore Supracitations
- 2010Structure of the carbon layers deposited on the toroidal pump limiter of Tore Supracitations
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article
Single-crystal and polycrystalline diamond erosion studies in Pilot-PSI
Abstract
International audience ; Diamond is a promising candidate for enhancing the negative-ion surface production in the ion sources for neutral injection in fusion reactors; hence evaluation of its reactivity towards hydrogen plasma is of high importance. High quality PECVD single crystal and polycrystalline diamond samples were exposed in Pilot-PSI with the D + flux of (4-7)·10 24 m-2 s-1 and the impact energy of 7-9 eV per deuteron at different surface temperatures; under such conditions physical sputtering is negligible, however chemical sputtering is important. Net chemical sputtering yield Y = 9.7·10-3 at/ion at 800°C was precisely measured ex-situ using a protective platinum mask (5x10x2 µm) deposited beforehand on a single crystal followed by the post-mortem analysis using Transmission Electron Microscopy (TEM). The structural properties of the exposed diamond surface were analyzed by Raman spectroscopy and X-ray Photoelectron Spectroscopy (XPS). Gross chemical sputtering yields were determined in-situ by means of optical emission spectroscopy of the molecular CH AX band for several surface temperatures. We observed a bell shape dependence of the erosion yield versus temperature between 400°C and 1200°C, with a maximum yield of ~1.5·10-2 at/ion attained at 900°C. The yields obtained for diamond are relatively high (0.51.5)·10-2 at/ion, comparable with those of graphite. XPS analyses show amorphization of diamond surface within 1 nm depth, in good agreement with molecular dynamics (MD) simulation. MD was also applied to study the hydrogen impact energy threshold for erosion of [100] diamond surface at different temperatures.