Search results for "Inertial confinement fusion"

showing 3 items of 3 documents

Observer for a thick layer of solid deuterium-tritium using backlit optical shadowgraphy and interferometry.

2007

Our work is in the context of the French "laser megajoule" project, about fusion by inertial confinement. The project leads to the problem of characterizing the inner surface, of the approximately spherical target, by optical shadowgraphy techniques. Our work is entirely based on the basic idea that optical shadowgraphy produces "caustics" of systems of optical rays, which contain a great deal of 3D information about the surface to be characterized. We develop a method of 3D reconstruction based upon this idea plus a "small perturbations" technique. Although computations are made in the special "spherical" case, the method is in fact general and may be extended to several other situations.

Physicsbusiness.industryMaterials Science (miscellaneous)Context (language use)Observer (special relativity)ShadowgraphyLaserIndustrial and Manufacturing Engineeringlaw.inventionInterferometryOpticslawBusiness and International ManagementPerturbation theorybusinessInertial confinement fusionLaser MégajouleApplied optics
researchProduct

A Model to Characterize the D-T Layer of ICF Targets by Backlit Optical Shadowgraphy

2005

A numerical model is presented in order to modelize the bright ring that appears in backlit optical shadowgraphy on a transparent hollow sphere with a solid deuterium-tritium layer inside. This novel model is based on computational calculations applied to the problem of the targets used in inertial confinement fusion. The model takes into account the influences of the optical imaging system (numerical aperture, source divergence, camera resolution, etc.) and the effect of the capsule itself, diameter, thickness, and refractive index, and allows one to analyze the inner surface of a capsule in terms of thickness and roughness.

Nuclear and High Energy PhysicsMaterials scienceComputer simulationbusiness.industry020209 energyMechanical Engineering02 engineering and technologySurface finishBacklightShadowgraphy01 natural sciences010305 fluids & plasmasNumerical apertureOpticsNuclear Energy and EngineeringPhysics::Plasma Physics0103 physical sciences0202 electrical engineering electronic engineering information engineeringGeneral Materials SciencebusinessImage resolutionRefractive indexInertial confinement fusionCivil and Structural EngineeringFusion Science and Technology
researchProduct

Germanium Doped CHxMicroshells for LMJ Targets

2011

AbstractAt the CEA Laser “Megajoule” facility, amorphous hydrogenated carbon (a-C:H or CHx) is the nominal ablator used to achieve inertial confinement fusion experiments. These targets are filled with a fusible mixture of deuterium-tritium in order to perform ignition.Since the achievement of ignition greatly depends on the physical properties of the shell, there must be precise control of thicknesses, doping concentration, and roughness. Experimental devices associated with suitable characterizations are described in this paper. The tolerances and yields for each specification are also presented. Some specifications are largely reached; high-frequency surface roughness due to isolated sur…

Nuclear and High Energy PhysicsMaterials science020209 energychemistry.chemical_elementNanotechnologyGermanium02 engineering and technologySurface finish01 natural sciences010305 fluids & plasmas0103 physical sciences0202 electrical engineering electronic engineering information engineeringSurface roughnessGeneral Materials ScienceThin filmInertial confinement fusionCivil and Structural Engineeringbusiness.industryMechanical EngineeringDopingFusible alloyAmorphous solidNuclear Energy and EngineeringchemistryOptoelectronicsbusinessFusion Science and Technology
researchProduct