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Articles:

Hamdan, A., Noel, C., Kosior, F., Henrion, G. and Belmonte, T.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 134(2, 1):991-1000 Belmonte, T (Reprint Author), Univ Lorraine, Inst Jean Lamour, UMR CNRS 7198, Parc Saurupt,CS 14234, F-54042 Nancy, France. Hamdan, A.; Noel, C.; Kosior, F.; Henrion, G.; Belmonte, T., Univ Lorraine, Inst Jean Lamour, UMR CNRS 7198, F-54042 Nancy, France.
2013
ISSN: 0001-4966

Resume: The determination of the initial pressure at the bubble wall created by a discharge in heptane for micro-gap conditions cannot be determined straightforwardly by modeling the time-oscillations of the bubble. The resolution of the Gilmore equation gives the same solutions beyond 1 mu s typically for various sets of initial parameters, making impossible the determination of the initial pressure at the bubble wall. Furthermore, the very first instant of the bubble formation is not easily accessible at very short time scales because of the plasma emission. Since the pressure waves propagate in the liquid, it is much easier to gain information on the first instants of the bubble formation by studying the pressure field far from the emission source. Then, it is possible to deduce by modeling what happened at the beginning of the emission of the pressure waves. The proposed solution consists in looking at the oscillations affecting another bubble located at least twice farther from the interelectrode gap than the maximum radius reached by the discharge bubble. The initial plasma pressure can be determined by this method. (C) 2013 Acoustical Society of America.

Equipe: Centre de Compétences : ERMIONE informatique et calcul

Hamdan, A., Noel, C., Kosior, F., Henrion, G. and Belmonte., T.
Journal of the Acoustical Society fo America, 134:991
2013

Resume: The determination of the initial pressure at the bubble wall created by a discharge in heptane for micro-gap conditions cannot be determined straightforwardly by modeling the time-oscillations of the bubble. The resolution of the Gilmore equation gives the same solutions beyond 1 mu s typically for various sets of initial parameters, making impossible the determination of the initial pressure at the bubble wall. Furthermore, the very first instant of the bubble formation is not easily accessible at very short time scales because of the plasma emission. Since the pressure waves propagate in the liquid, it is much easier to gain information on the first instants of the bubble formation by studying the pressure field far from the emission source. Then, it is possible to deduce by modeling what happened at the beginning of the emission of the pressure waves. The proposed solution consists in looking at the oscillations affecting another bubble located at least twice farther from the interelectrode gap than the maximum radius reached by the discharge bubble. The initial plasma pressure can be determined by this method. (C) 2013 Acoustical Society of America.

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

Margueron, Samuel, Bartasyte, Ausrine, Plausinaitiene, Valentina, Abrutis, Adulfas, Boulet, Pascal, Kubilius, Virgaudas and Saltyte, Zita
8626
2013
ISSN: 0277-786X

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

Martin, J., Melhem, A., Shchedrina, I., Duchanoy, T., Nominé, A., Henrion, G., Czerwiec, T. and Belmonte, T.
Surface and Coatings Technology, 221:70
2013

Resume: The plasma electrolytic oxidation (PEO) of aluminium alloys is investigated for different electrical working conditions using a pulsed bipolar current supply. A particular attention is paid to the effect of the anodic current density (from 10 to 90 A dm-2) and current pulse frequency (from 100 to 900 Hz) on the resulting oxide layer. Micro-discharges are characterized during the process by means of fast video imaging with a time and a space resolution of 8 μs and 0.017 mm2, respectively. Correlations are established between themicro-discharge characteristics (surface density, lifetime and size) and the elaborated oxide layers (morphology, growth rate and surface roughness). The highest coating growth rate measured (2.1 μm min-1) is achieved with the combination of the highest current density (75.7 A dm-2) and the highest current pulse frequency (900 Hz). Within these specific current conditions it is concluded that the detrimental effects of numerous micro-discharges are minimized. The results also show that the surface roughness may be largely affected by the presence of long-lived and large micro-discharges which develop over the processed surface. The strongest micro-discharges (live duration up to 0.3 ms and cross-sectional area up to 1 mm2) are mainly observed with the combination of the highest current density (75.7 A dm-2) and the lowest current pulse frequency (100 Hz).

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

Leroy, M.-A., Bataille, A.M., Bertran, F., Le Fèvre, P., Taleb-Ibrahimi, A. and Andrieu, S.
Physical Review B - Condensed Matter and Materials Physics, 88(20)
2013

Equipe: Département P2M : Nanomagnétisme et Electronique de Spin

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

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

Presser, Volker, Naguib, Michael, Chaput, Laurent, Togi, Atsushi, Hug, Gilles and Barsoum, Michel W.
JOURNAL OF RAMAN SPECTROSCOPY, 44(7):1060
2013
ISSN: 0377-0486

Equipe: Département P2M : Surfaces et Spectroscopies

Nguyen, V.S., Badie, L., Sénéchault, E., Blampain, E., Vincent, B., Venet, C., Elmazria, O. and Rouxel, D.
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 60(10):2039-2043
2013

Equipe: Centre de Compétences : MiNaLor micro et nanotechnologies

Ben Youssef, I., Alem, H., Sarry, F., Elmazria, O., Jimenez Rioboo, R., Arnal-Hérault, C. and Jonquières, A.
Sensors and Actuators, B: Chemical, 185:309-320
2013

Equipe: Centre de Compétences : MiNaLor micro et nanotechnologies

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