scholarly journals Fabrication and monitoring of advanced low-density media for ICF targets

1999 ◽  
Vol 17 (4) ◽  
pp. 661-670 ◽  
Author(s):  
A.I. GROMOV ◽  
N.G. BORISENKO ◽  
S.Y. GUS'KOV ◽  
YU.A. MERKUL'EV ◽  
A.V. MITROFANOV
Keyword(s):  
Inertial Confinement Fusion ◽  
Radiation Absorption ◽  
Inertial Confinement ◽  
Low Density ◽  
Free Standing ◽  
Absorption Region ◽  
Confinement Fusion ◽  
Porous Matter ◽  
Convenient Model ◽  
Density Matter

Recently much attention has been paid to multilayer inertial confinement fusion (ICF) targets, among them the targets with low-density layers. This allows one to get a number of interesting results using the presently existing and future facilities. This concerns the volume absorption of the laser radiation in a porous matter of the density higher than the critical plasma density, and the formation of the radiation absorption region under condition of increasing geometric opacity of the low-density matter. We consider the low-density foams, 3D nets, free-standing “snow-like” layers, and pseudo low-density layers. We use artificial foam as a convenient model to allow easier comparison of the experimental laser shot data and the simulation. The requirements to such layers are also analyzed. The methods of precision control of the low-density targets are discussed.

scholarly journals Free-standing targets for applications to ICF

1999 ◽  
Vol 17 (4) ◽  
pp. 713-727 ◽  
Author(s):  
I.V. ALEKSANDROVA ◽  
E.R. KORESHEVA ◽  
I.E. OSIPOV
Keyword(s):  
Inertial Confinement Fusion ◽  
Laser System ◽  
Inertial Confinement ◽  
High Power Laser ◽  
Power Laser ◽  
Free Standing ◽  
Conceptual Approach ◽  
Polymer Shell ◽  
Confinement Fusion ◽  
High Power Laser System

In conventional inertial confinement fusion (ICF), a high power laser system is used to compress a cryogenic target and create energy. One of the challenges for ICF cryogenics is producing the homogeneous and uniform fuel on the inside surface of a spherical polymer shell. In this report, we will discuss a conceptual approach based on freestanding targets and the results of our recent and current developments.

scholarly journals Physical processes in laser interaction with porous low-density materials

2008 ◽  
Vol 26 (4) ◽  
pp. 537-543 ◽  
Author(s):  
N.G. Borisenko ◽  
A.E. Bugrov ◽  
I.N. Burdonskiy ◽  
I.K. Fasakhov ◽  
V.V. Gavrilov ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Diagnostic Methods ◽  
Inertial Confinement ◽  
Low Density ◽  
Laser Interaction ◽  
Material Microstructure ◽  
Optical Diagnostic ◽  
Confinement Fusion ◽  
Temporal And Spatial ◽  
Material Utilization

AbstractNew results obtained in experiments on laser irradiation (I = 5 × 1013 W/cm2, λ = 1.054 µm) of low-density (2–10 mg/cm3) porous materials (agar, triacetate cellulose, and foam polysterene) are presented and discussed from the standpoint of optimum porous material utilization in target designs for inertial confinement fusion. The influence of low-density material microstructure of irradiated samples on the absorption of laser radiation and the energy transfer processes was investigated using X-ray and optical diagnostic methods with high temporal and spatial resolution.

Optical properties of low-density foams considered as targets for inertial confinement fusion

1998 ◽  
Vol 16 (1) ◽  
pp. 50-56
Author(s):  
O. J. Glembocki ◽  
M. L. Rebbert ◽  
S. M. Prokes ◽  
J. D. Sethian ◽  
C. R. K. Marrian ◽  
...  
Keyword(s):  
Optical Properties ◽  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
Low Density ◽  
Confinement Fusion

scholarly journals Rayleigh–Taylor instability analysis of targets with a low-density ablation layer

1999 ◽  
Vol 17 (2) ◽  
pp. 237-244 ◽  
Author(s):  
J. SANZ ◽  
R. BETTI ◽  
V.N. GONCHAROV
Keyword(s):  
Inertial Confinement Fusion ◽  
Taylor Instability ◽  
Inertial Confinement ◽  
Low Density ◽  
Radiation Emission ◽  
Confinement Fusion ◽  
Basic Physics ◽  
Rayleigh Taylor Instability ◽  
Boundary Model ◽  
The Stability

Irregularities on the outer surface of Inertial Confinement Fusion (ICF) capsules accelerated by laser irradiation are amplified by the Rayleigh–Taylor instability (RTI), which occurs at the ablation front (ablative RTI), where density gradient and acceleration have the same direction. The analytic stability theory of subsonic ablation fronts, for Froude number larger than one, shows that the main stabilization mechanisms are blowoff convection (rocket effect equilibrating the gravity force) and ablation (Sanz 1994; Betti et al. 1996). Blowoff convection and ablation are enhanced if the ablator material is mixed with high-Z dopants. The latest enhances radiation emission setting the ablator on a higher adiabat, lowering its density, and increasing the ablation velocity. When such an ablator is used to push a solid deuterium-tritium (D–T) shell, the D–T-ablator interface becomes classically unstable. The aim of this paper is to investigate the stability of such a configuration, represented by a low-density ablator pushing a heavier shell, and study the interplay between the classical and ablative RTIs occurring simultaneously. The stability analysis is carried out using a sharp boundary model (Piriz et al. 1997), which contains all the basic physics of the RTI in ICF.

scholarly journals Rapid fuel layering inside moving free-standing ICF targets: Physical model and simulation code development

2002 ◽  
Vol 20 (1) ◽  
pp. 13-21 ◽  
Author(s):  
I.V. ALEKSANDROVA ◽  
S.V. BAZDENKOV ◽  
V.I. CHTCHERBAKOV
Keyword(s):  
Mathematical Modeling ◽  
Heat Transfer ◽  
Physical Model ◽  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
Physical Concept ◽  
Free Standing ◽  
Simulation Code ◽  
Model And Simulation ◽  
Confinement Fusion

In this report, we discuss the physical concept and the results of mathematical modeling of free-standing target (FST) layering for inertial confinement fusion (ICF), including the detailed descriptions of the heat transfer and layer symmetrization mechanisms.

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