Search Results - "Champeaux, S."

Improved Design of a Multistage Axial Vircator With Reflectors for Enhanced Performances by Champeaux, S., Gouard, Ph, Cousin, R., Larour, J.

“…The basic design of an axial virtual cathode oscillator (vircator) with axial extraction operating in TM01 mode is modified by introducing thin conducting…”
Get full text

Streamer and zonal flow generation from envelope modulations in drift wave turbulence by Champeaux, S, Diamond, P.H

“…The origin of anisotropic secondary flows, such as zonal flows and streamers, in drift wave turbulence is examined. A unified description including diffraction…”
Get full text

Ferroelectric materials and metamaterials for a new approach to ITER–ICRH loads by Bottollier-Curtet, H., Champeaux, S., Gouard, Ph, Primout, M., Bécoulet, A., Litaudon, X., Magne, R.

“…This paper presents a new approach for ICRH loads used in laboratory testing. Classical “water” loads are convenient but strongly limited in terms of…”
Get full text

Control of lasing filament arrays in nonlinear liquid media by Guyon, L., Hajek, K.M., Courvoisier, F., Boutou, V., Nuter, R., Vinçotte, A., Champeaux, S., Bergé, L., Wolf, J.-P.

“…Multiple filamentation in a high concentration solution of coumarin 153 in ethanol is studied. It is shown that the output filament pattern may be controlled…”
Get full text

(3+1)-dimensional numerical simulations of femtosecond laser filaments in air: toward a quantitative agreement with experiments by Champeaux, S, Bergé, L, Gordon, D, Ting, A, Peñano, J, Sprangle, P

“…Three-dimensional numerical simulations and direct experimental measurements of the multifilamentation of femtosecond laser pulses propagating in air are…”
Get full text

Multifilamentation transmission through fog by Méjean, G, Kasparian, J, Yu, J, Salmon, E, Frey, S, Wolf, J-P, Skupin, S, Vinçotte, A, Nuter, R, Champeaux, S, Bergé, L

“…The influence of atmospheric aerosols on the filamentation patterns created by TW laser beams over 10 m propagation scales is investigated, both experimentally…”
Get full text

3-D PIC Numerical Investigations of a Novel Concept of Multistage Axial Vircator for Enhanced Microwave Generation by Champeaux, Stephanie, Gouard, Philippe, Cousin, Richard, Larour, Jean

“…The enhancement of power conversion efficiency of a classical axial VIRtual CAthode oscillaTOR (vircator) by introducing one or more reflectors beyond the…”
Get full text

Remarks on the parallel propagation of small-amplitude dispersive Alfvénic waves by Champeaux, S., Laveder, D., Passot, T., Sulem, P. L.

“…The envelope formalism for the description of a small-amplitude parallel-propagating Alfvén wave train is tested against direct numerical simulations of the…”
Get full text

32 TW atmospheric white-light laser by Béjot, P., Bonacina, L., Extermann, J., Moret, M., Wolf, J. P., Ackermann, R., Lascoux, N., Salamé, R., Salmon, E., Kasparian, J., Bergé, L., Champeaux, S., Guet, C., Blanchot, N., Bonville, O., Boscheron, A., Canal, P., Castaldi, M., Hartmann, O., Lepage, C., Marmande, L., Mazataud, E., Mennerat, G., Patissou, L., Prevot, V., Raffestin, D., Ribolzi, J.

“…Ultrahigh power laser pulses delivered by the Alisé beamline ( 26 J , 32 TW pulses) have been sent vertically into the atmosphere. The highly nonlinear…”
Get full text

Nonlinear dynamics of weakly dispersive Alfvén waves by Champeaux, S, Gazol, A, Passot, T, Sulem, P L

Get full text

Postionization regimes of femtosecond laser pulses self-channeling in air by Champeaux, Stéphanie, Bergé, Luc

“…An optical self-guiding of femtosecond filaments in air is identified in a regime where plasma generation ceases to support the self-channeling process…”
Get full text

Femtosecond pulse compression in pressure-gas cells filled with argon by Champeaux, Stéphanie, Bergé, Luc

“…The nonlinear propagation of femtosecond pulses in pressure-gas cells filled with argon is investigated. By increasing the pressure for reaching peak power…”
Get full text

Plasma Heating by Alfvén Wave Filamentation: A Relevant Mechanism in the Solar Corona and the Interstellar Medium by Champeaux, Stéphanie, Gazol, Adriana, Passot, Thierry, Sulem, Pierre-Louis

Get full text

Nonlinear Dynamics of Weakly Dispersive Alfv?n Waves by Champeaux, S., Gazol, A., Passot, T., Sulem, P. L.

Get full text

Relocalization of femtosecond laser pulses out of ionization regime in air by Champeaux, S., Berge, L.

“…We investigate post-ionization regimes of femtosecond laser pulse propagating in the atmosphere. The role of group velocity dispersion and delayed-Kerr…”
Get full text

Self-organized bundle of lasing filaments in dense media by Guyon, L., Courvoisier, F., Boutou, V., Nuter, R., Vinçotte, A., Champeaux, S., Bergé, L., Glorieux, P., Wolf, J.-P.

“…The filamentation of powerful, ultrashort laser pulses in liquids is investigated. It is shown that the multiple filaments produced in ethanol can be modified…”
Get full text

Self-organized bundle of lasing filaments in dense media by Guyon, L., Courvoisier, F., Boutou, V., Nuter, R., Vincotte, A., Champeaux, S., Berge, L., Glorieux, P., Wolf, J.-P., Departement de Physique Theorique et Appliquee, CEA-DAM/Ile de France, B.P. 12, 91680 Bruyeres-le-Chatel, Laboratoire de Physique des Lasers, Atomes et Molecules, UMR 8523, Universite de Lille I, Batiment P5-USTL 59655 Villeneuve d'Ascq Cedex, GAP, Universite de Geneve, 20 Rue de l'Ecole de Medecine, 1211 Geneva 4

“…The filamentation of powerful, ultrashort laser pulses in liquids is investigated. It is shown that the multiple filaments produced in ethanol can be modified…”
Get full text

Filamentation patterns of TW laser pulses in air by Bergc, L., Gouedard, C., Champeaux, S., Ward, H.

“…We simulate filamentation patterns produced by the TERAMOBILE laser, which delivers pulses of 300 fs duration with 300-mJ energy at the wavelength /spl…”
Get full text

Outcome After Protontherapy for Progression or Recurrence of Surgically Treated Meningioma by Charles Champeaux-depond, Joconde Weller

“…Background To assess the outcome after meningioma surgery and protontherapy (PT). Methods We processed the French Systeme National des Donnees de Sante…”
Get full text

Survival After Newly-Diagnosed High-Grade Glioma Surgery: What Can We Learn From the French National Healthcare Database? by Charles Champeaux Depond, Luc Bauchet, Dahmane Elhairech, Philippe Tuppin, Vincent Jecko, Joconde Weller, Philippe Metellus

“…Background This study aimed to assess the overall survival (OS) of patients after high-grade glioma (HGG) resection and to search for associated prognostic…”
Get full text