6 results on '"L Colina Delacqua"'
Search Results
2. In-situdiagnostics of hydrocarbon dusty plasmas using quantum cascade laser absorption spectroscopy and mass spectrometry
- Author
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J Röpcke, Khaled Hassouni, L. Colina Delacqua, Karim Ouaras, Guillaume Lombardi, Maxime Wartel, M. Redolfi, Xavier Bonnin, Laboratoire des Sciences des Procédés et des Matériaux (LSPM), Université Paris 13 (UP13)-Institut Galilée-Université Sorbonne Paris Cité (USPC)-Centre National de la Recherche Scientifique (CNRS), INP Greifswald, Universität Greifswald - University of Greifswald, Groupe de recherches sur l'énergétique des milieux ionisés (GREMI), and Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
chemistry.chemical_classification ,Physics ,Absorption spectroscopy ,Infrared ,[SPI.PLASMA]Engineering Sciences [physics]/Plasmas ,Analytical chemistry ,Plasma ,Condensed Matter Physics ,Mass spectrometry ,Ion ,law.invention ,Hydrocarbon ,chemistry ,Physics::Plasma Physics ,[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,13. Climate action ,law ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Atomic physics ,Absorption (chemistry) ,Quantum cascade laser ,Astrophysics::Galaxy Astrophysics - Abstract
The formation of carbon nanoparticles in low pressure magnetized H2/CH4and H2/C2H2plasmas is investigated using infrared quantum cascade laser absorption, mass spectrometry, and electrostatic probe measurements. Results showed that dust formation is correlated to the presence of a significant amount of large positively charged hydrocarbon ions. Large negative ions or neutral hydrocarbon were not observed. These results, along with a qualitative comparison of diffusion and reaction characteristic, suggest that a positive ion may contribute to the growth of nanoparticles in hydrocarbon magnetized plasmas.
- Published
- 2014
- Full Text
- View/download PDF
3. Field Reversal and Particle Growth in DC Discharge
- Author
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C. Arnas, L. Colina Delacqua, M. Redolfi, Xavier Bonnin, A. Michau, Khaled Hassouni, Guillaume Lombardi, and P. Jestin
- Subjects
Argon ,Field (physics) ,General Chemical Engineering ,chemistry.chemical_element ,General Chemistry ,Plasma ,Condensed Matter Physics ,complex mixtures ,Molecular physics ,Surfaces, Coatings and Films ,Aerosol ,chemistry ,Sputtering ,Cluster (physics) ,Atomic physics ,Particle density ,Carbon - Abstract
A modeling study of carbon clusters and dust particles formation through carbon graphite sputtering in argon DC discharges is presented. The model combines the description of plasma discharge kinetics, molecular growth and transport of carbon clusters and aerosol dynamics for dust particles. Results show that field reversal is a key effect that ensures trapping and growth of negatively charged molecular carbon clusters, which are the precursors for dust particles. The model enables prediction of the space–time distributions of carbon clusters density as well as dust particle density, average charge and average diameter. Results especially show that dust particles and carbon clusters exhibit a pronounced density maximum in the vicinity of the field reversal position. A parametric study is presented in order to analyze the model sensitivity to some key parameters used in the physical model.
- Published
- 2012
- Full Text
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4. Experimental studies of the interactions between a hydrogen plasma and a carbon or tungsten wall
- Author
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Karim Ouaras, Guillaume Lombardi, Dominique Vrel, Khaled Hassouni, Xavier Bonnin, C. Quirós, M. Redolfi, L. Colina Delacqua, Laboratoire des Sciences des Procédés et des Matériaux (LSPM), and Université Paris 13 (UP13)-Institut Galilée-Université Sorbonne Paris Cité (USPC)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
History ,Tokamak ,Thermonuclear fusion ,Hydrogen ,Analytical chemistry ,chemistry.chemical_element ,02 engineering and technology ,Tungsten ,Mass spectrometry ,7. Clean energy ,01 natural sciences ,010305 fluids & plasmas ,Education ,law.invention ,[SPI.MAT]Engineering Sciences [physics]/Materials ,law ,Specific surface area ,0103 physical sciences ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,Spectroscopy ,Chemistry ,[SPI.PLASMA]Engineering Sciences [physics]/Plasmas ,Plasma ,021001 nanoscience & nanotechnology ,Computer Science Applications ,0210 nano-technology - Abstract
International audience; We present work done at LSPM (Laboratory of Sciences of Processes and Material Sciences), using the CASIMIR ECR plasma reactor device, aimed at answering questions about hydrogen isotope fuel retention and dust production in the context of the plasma-facing components (PFCs) of the International Thermonuclear Experimental Reactor (ITER). The plasma is characterized by means of optical spectroscopy, mass spectrometry and electrostatic probe; furthermore the dust density and size distribution will be measured by a laser diagnostic system. We present some early results obtained from hydrogen plasma exposure of pure tungsten samples, as well as samples of ITER-relevant tungsten-rich powders, produced inhouse by the ball-milling technique, which are likely to be a by-product of material erosion and migration during tokamak operation. In particular, we have performed measurements of the specific surface area of these powders as a proxy to their capacity to absorb hydrogen.
- Published
- 2015
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5. Particle Formation In A DC Discharge
- Author
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A. Michau, G. Lombardi, L. Colina Delacqua, M. Redolfi, C. Arnas, X. Bonnin, K. Hassouni, Vladimir Yu. Nosenko, Padma K. Shukla, Markus H. Thoma, and Hubertus M. Thomas
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Electron density ,Field (physics) ,Physics::Plasma Physics ,Chemistry ,Chemical physics ,Ionization ,Electric field ,Nucleation ,Charge density ,Particle ,Plasma ,Atomic physics - Abstract
We developed a model for the nucleation, growth and transport of carbonaceous dust particles in a non‐reactive gas dc discharge where the carbon source is provided by cathode sputtering. In a first part, we considered only the initial phase of the discharge when the dust charge density remains small with respect to the electron density. We found that an electric field reversal at the entrance of the negative glow region promotes trapping of negatively charged clusters and dust particles, confining them for long times in the plasma and favoring molecular growth. An essential ingredient for this process is electron attachment, which negatively charges the initially neutral clusters. We also showed that the field reversal mechanism can operate to trap negative clusters and particles under both electropositive and strongly electronegative plasma.
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- 2011
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6. Modelling of dust grain formation in a low-temperature plasma reactor used for simulating parasitic discharges expected under tokamak divertor domes
- Author
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L. Colina Delacqua, A. Michau, Khaled Hassouni, Guillaume Lombardi, C. Arnas, M. Redolfi, and Xavier Bonnin
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Thermonuclear fusion ,Argon ,Tokamak ,Chemistry ,Divertor ,chemistry.chemical_element ,Plasma ,Condensed Matter Physics ,law.invention ,law ,Sputtering ,Chemical physics ,Electric discharge ,Atomic physics ,Carbon - Abstract
The presence of nanostructured dust particles has been reported in thermonuclear fusion reactors with carbon plasma-facing components. These particles contribute to tritium retention and pollution of the edge plasma. Understanding the way these particles can grow in the plasma phase is necessary for designing engineering solutions that avoid or at least limit their formation. As a first step towards this goal, this paper presents a numerical study of the formation of dust in a simple model laboratory electrical discharge: a dc discharge generated in argon with a graphite electrode. The aim here is to investigate whether carbon sputtering through ion and fast neutral bombardment of the cathode and subsequent molecular growth of carbon clusters and particle nucleation and development can explain dust formation in this model discharge. Results show that field reversal effects and negative cluster formation and trapping can fully explain dust formation in such a dc discharge.
- Published
- 2010
- Full Text
- View/download PDF
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