Výsledky vyhledávání - "Bedros Afeyan"

Vlasov–Maxwell simulations of backward Raman amplification of seed pulses in plasmas

Publikováno v: Laser and Particle Beams. 34:576-600

We study the problem of the amplification of an ultra-short seed pulse via stimulated Raman backscattering (SRB) from a long pump pulse (assumed to have an envelope with a constant amplitude), in an underdense plasma. The SRB interaction couples the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b1ca8711f97bb8cfd9f98d7e14dad185
https://doi.org/10.1017/s0263034616000495

Zobrazit plný text záznamu

Control of Nonlinear Optical Processes in High Energy Density Plasmas Using Sub-Picosecond, High-Contrast, Temporal Modulations and Spatial Speckle-Pattern Scrambling

Autor: Stefan Hüller, Bedros Afeyan

Publikováno v: Nonlinear Optics.

Combining techniques from nonlinear, ultrafast and statistical optics, flexible control of laser-plasma instabilities is attainable. Adaptively using spike trains of uneven duration and delay (STUD pulses), single and multiple crossing beam instabili

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::06ad6da38d67d4d683d927f5719870f1
https://doi.org/10.1364/nlo.2017.nf2a.7

Zobrazit plný text záznamu

Studies of the interaction of an intense laser beam normally incident on an overdense plasma

Autor: Bedros Afeyan, Magdi Shoucri

Publikováno v: Laser and Particle Beams. 28:129-147

We present two contrasting cases of the interaction of a high intensity laser beam with overdense plasma, namely the case of a circular polarization, and the case of a linear polarization of the laser beam. An Eulerian-Vlasov code is used for the num

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9291b48220a9fcb33058080b2d5d5c81
https://doi.org/10.1017/s0263034610000017

Zobrazit plný text záznamu

Morphological Component Analysis and Inpainting on the Sphere: Application in Physics and Astrophysics

Autor: Yassir Moudden, Jean-Luc Starck, Jérôme Bobin, Mai K. Nguyen, P. Abrial, Bedros Afeyan, Jalal M. Fadili

Publikováno v: Journal of Fourier Analysis and Applications
Journal of Fourier Analysis and Applications, Springer Verlag, 2007, 13 (6), pp.729-748
Journal of Fourier Analysis and Applications, 2007, 13 (6), pp.729-748

International audience; Morphological Component Analysis (MCA) is a new method which takes advantage of the sparse representation of structured data in large overcomplete dictionaries to separate features in the data based on the diversity of their m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::61de5302ed7fb87eb24c11296220ad91
https://doi.org/10.1007/s00041-006-6908-x

Zobrazit plný text záznamu

Simulations of Kinetic Electrostatic Electron Nonlinear (KEEN) Waves with Variable Velocity Resolution Grids and High-Order Time-Splitting

Autor: Adila Dodhy, Eric Sonnendrücker, Fernando Casas, Michel Mehrenberger, Erwan Faou, Nicolas Crouseilles, Bedros Afeyan

Publikováno v: The European Physical Journal D : Atomic, molecular, optical and plasma physics
The European Physical Journal D : Atomic, molecular, optical and plasma physics, 2014, 68 (10), DOI: 10.1140/epjd/e2014-50212-6. ⟨10.1140/epjd/e2014-50212-6⟩
European Physical Journal D
European Physical Journal D, SpringerLink, 2014, 68 (10), DOI: 10.1140/epjd/e2014-50212-6. 〈10.1140/epjd/e2014-50212-6〉
The European Physical Journal D : Atomic, molecular, optical and plasma physics, EDP Sciences, 2014, 68 (10), DOI: 10.1140/epjd/e2014-50212-6. ⟨10.1140/epjd/e2014-50212-6⟩
The European Physical Journal D: Atomic, Molecular and Optical Physics
The European Physical Journal D

KEEN waves are non-stationary, nonlinear, self-organized asymptotic states in Vlasov plasmas. They lie outside the precepts of linear theory or perturbative analysis, unlike electron plasma waves or ion acoustic waves. Steady state, nonlinear constru

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aefba58ad2a65b3e3aaf25e25ab87f92
https://hal.science/hal-00977344

Zobrazit plný text záznamu

Observed insensitivity of stimulated Raman scattering on electron density

Autor: Juan C. Fernandez, Mark D. Wilke, D. S. Montgomery, Bedros Afeyan, J. A. Cobble

Publikováno v: Physics of Plasmas. 7:3743-3750

The results from experiments in quasihomogeneous plasmas to evaluate the potential threat of high laser reflectivity from stimulated Raman scattering (SRS) to inertial-confinement fusion (ICF) are presented. The SRS laser reflectivity is observed to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::989164c94cee44b7b61209f167baf8ff
https://doi.org/10.1063/1.1287134

Zobrazit plný text záznamu

Direct-drive laser fusion: Status and prospects

Autor: James Knauer, C. P. Verdon, Robert Lehmberg, Stephen E. Bodner, Denis Colombant, Howard T. Powell, John H. Gardner, Andrew J. Schmitt, Bedros Afeyan, Lee Phillips, Stephen P. Obenschain, John D. Sethian, R. L. McCrory, W. Seka

Publikováno v: Physics of Plasmas. 5:1901-1918

Techniques have been developed to improve the uniformity of the laser focal profile, to reduce the ablative Rayleigh–Taylor instability, and to suppress the various laser–plasma instabilities. There are now three direct-drive ignition target desi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2bb86a3345472459f114384767180b89
https://doi.org/10.1063/1.872861

Zobrazit plný text záznamu

Kinetic Theory of Electron-Plasma and Ion-Acoustic Waves in Nonuniformly Heated Laser Plasmas

Autor: Richard Town, William Kruer, Albert E. Chou, Bedros Afeyan, J. P. Matte

Publikováno v: Physical Review Letters. 80:2322-2325

Using Fokker-Planck simulations, we have studied the evolution of different charge state plasmas heated by lasers having transverse spatial modulations (speckle patterns) and hot spots. The kinetic response of the plasma is computed using the resulti

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::32f9f0b6458f4093e0d6ddba4df9174c
https://doi.org/10.1103/physrevlett.80.2322

Zobrazit plný text záznamu

Time-dependent filamentation and stimulated Brillouin forward scattering in inertial confinement fusion plasmas

Autor: Bedros Afeyan, Andrew J. Schmitt

Publikováno v: Physics of Plasmas. 5:503-517

Numerical simulations of the temporal evolution of laser light filamentation and stimulated Brillouin forward scattering (SBFS) in plasmas, under conditions that are relevant to laser fusion, are presented and analyzed. Long term unsteady behavior of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b3db124015bf7a409c33e7ad89f34186
https://doi.org/10.1063/1.872733

Zobrazit plný text záznamu

A variational approach to parametric instabilities in inhomogeneous plasmas III: Two-plasmon decay

Autor: Edward Williams, Bedros Afeyan

Publikováno v: Physics of Plasmas. 4:3827-3844

The theory of the two-plasmon decay instability is recast in the form of a variational principle for the pump strength or intensity of the incident laser. This allows the calculation of growth rates, frequency shifts, and threshold conditions for two

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8d45c35481b7c9b75265ff2247cf3b2b
https://doi.org/10.1063/1.872506

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání