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Articles:

Melchior, P., Rollinger, M., Thielen, P., Alebrand, S., Bierbrauer, U., Schneider, C., Gottwald, M., Hehn, M., Mangin, S., Cinchetti, M. and Aeschlimann, M.
Physical Review B - Condensed Matter and Materials Physics, 88(10)
2013

Equipe: Département P2M : Nanomagnétisme et Electronique de Spin

Riahi, H., Montaigne, F., Rougemaille, N., Canals, B., Lacour, D. and Hehn, M.
Journal of Physics Condensed Matter, 25(33)
2013

Equipe: Département P2M : Nanomagnétisme et Electronique de Spin

Drevlak, M., Brochard, F., Helander, P., Kisslinger, J., Mikhailov, M., Nührenberg, C., Nührenberg, J. and Turkin, Y.
Contributions to Plasma Physics, 53:459-468
2013

Resume: This work presents the physics design for a simple quasi-axially symmetric stellarator. A plasma configuration described by a modest number of Fourier coefficients was found to establish this symmetry with good accuracy. The low rotational transform results in a relatively simple coil set exhibiting low curvatures and comfortable clearance between adjacent coils. As another consequence, the maximum achievable plasma pressure will be limited to about 0.5%. An experiment along the lines proposed would allow an exploration of the confinement properties of a quasi-axially symmetric configuration. ((c) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS

Bartasyte, Ausrine, Plausinaitiene, Valentina, Abrutis, Adulfas, Stanionyte, Sandra, Margueron, Samuel, Boulet, Pascal, Kobata, T., Uesu, Yoshiaki and Gleize, Jerome
JOURNAL OF PHYSICS-CONDENSED MATTER, 25
2013
ISSN: 0953-8984

Equipe: Centre de Compétences : X-Gamma rayons X et spectroscopie

Hamdan, A., Audinot, J.-N., Migot-Choux C. Noël, S., Henrion, G. and Belmonte, T.
Journal of Applied Physics, 113:043301
2013

Resume: Modes of energy dissipation in impacts made on various materials (Al, Cu, Fe, and Si) by discharges in heptane are investigated for micro-gap conditions. Bulk metals and thin films of 300 nm in thickness deposited on silicon wafers are used as samples. Positive high voltage pulses with nanosecond rise times make it possible to isolate a single discharge and to study the way the charge delivered by the power supply is transferred to the larger electrode (the sample) in a pin-to-plate configuration. The diameter of the impacts created by the plasma varies linearly versus the charge raised at a power close to 0.5. However, the exact value of the power depends on the material. We also show how the impact morphologies change with the applied charge. At high charges, the diameters of impacts on thin films behave as those made on silicon. At low charges, they behave as the bulk material. Finally, we show that the energy dissipated in impacts is below a few percent.

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS

Geandier, G., Dehmas, M., Mourot, M., Aeby-Gautier, E., Denis, S., Martin, O. and Karnatak, N.
Materials Science Forum, 768-769:313-320
2013

Equipe: Département SI2M : Microstructures et Contraintes

Devynck, S., Gradeck, M., Bellot, J.P., Denis, S., Maigrat, G., Varlez, M. and Benard, T.
Key Engineering Materials, 554--557:1530--1538
2013

Equipe: Département SI2M : Microstructures et Contraintes

Di Giovannantonio, Marco, El Garah, Mohamed, Lipton-Duffin, Josh, Meunier, Vincent, Cardenas, Luis, Revurat, Yannick Fagot, Cossaro, Albano, Verdini, Alberto, Perepichka, Dmitrii F., Rosei, Federico and Contini, Giorgio
ACS NANO, 7(9):8190-8198
2013
ISSN: 1936-0851

Equipe: Département P2M : Surfaces et Spectroscopies

Hamdan, Ahmad, Audinot, Jean-Nicolas, Migot-Choux, Sylvie, Noel, Cedric, Kosior, Francis, Henrion, Gerard and Belmonte, Thierry
ADVANCED ENGINEERING MATERIALS, 15(10):885-892 Hamdan, A (Reprint Author), Univ Lorraine, Inst Jean Lamour, CNRS, UMR 7198, F-54042 Nancy, France. Hamdan, Ahmad; Migot-Choux, Sylvie; Noel, Cedric; Kosior, Francis; Henrion, Gerard; Belmonte, Thierry, Univ Lorraine, Inst Jean Lamour, CNRS, UMR 7198, F-54042 Nancy, France. Audinot, Jean-Nicolas, Ctr Rech Publ Gabriel Lippmann, SAM Dept, L-4422 Belvaux, Luxembourg.
2013
ISSN: 1438-1656

Resume: Discharges in heptane in pin-to-plate configuration are produced between a platinum wire and a (100)-oriented silicon wafer coated by a carbon nanotube (CNT) carpet. This carpet is used to simulate the behavior of a nanostructured surface in electro-discharge machining (EDM) where small protrusions on the surface could play a similar role. CNTs behave like simple electrical conductors between the discharge and the silicon wafer. They act as if they would focus the current on smaller areas. The average diameter of impacts is about five times smaller if the silicon wafer is coated by a CNT carpet. The underlying silicon surface is heated by the plasma and melts, forming a central spot surrounded by a serrated trailing edge. The current density being about one order of magnitude larger when a CNT carpet is present, the induced magnetic field stirs the molten silicon, creating serrations all around the impact. Hot nanoparticles of carbon coming from the plasma fall and roll randomly on the silicon surface where they create wavy micro-channels. Nanowires that are detached from the surface are covered by nanoparticles of platinum in the plasma and embedded within an amorphous carbon layer deposited on the nanotube. However, these effects can only be observed if the current density is high enough (>approximate to 10A mu m(-2) depending on the material) like in micro-EDM but not in nano-EDM.

Equipe: Centre de Compétences : ERMIONE informatique et calcul

Hamdan, A., Audinot, J.-N., Migot-Choux, S., Noel, C., Kosior, F., Henrion, G. and Belmonte, T.
Advanced Engineering Materials, 15:885-892
2013

Resume: Discharges in heptane in pin-to-plate configuration are produced between a platinum wire and a (100)-oriented silicon wafer coated by a carbon nanotube (CNT) carpet. This carpet is used to simulate the behavior of a nanostructured surface in electro-discharge machining (EDM) where small protrusions on the surface could play a similar role. CNTs behave like simple electrical conductors between the discharge and the silicon wafer. They act as if they would focus the current on smaller areas. The average diameter of impacts is about five times smaller if the silicon wafer is coated by a CNT carpet. The underlying silicon surface is heated by the plasma and melts, forming a central spot surrounded by a serrated trailing edge. The current density being about one order of magnitude larger when a CNT carpet is present, the induced magnetic field stirs the molten silicon, creating serrations all around the impact. Hot nanoparticles of carbon coming from the plasma fall and roll randomly on the silicon surface where they create wavy micro-channels. Nanowires that are detached from the surface are covered by nanoparticles of platinum in the plasma and embedded within an amorphous carbon layer deposited on the nanotube. However, these effects can only be observed if the current density is high enough (>approximate to 10A mu m(-2) depending on the material) like in micro-EDM but not in nano-EDM.

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS

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