Angular radiation temperature simulation for time-dependent capsule drive prediction in inertial confinement fusion

The optimal usage of designed fuel pellets is one of the very important parameters in inertial confinement fusion (ICF) systems. In this research, time-dependent dynamical equations for D/D fuel are written by considering impurity of 6 Li . Then dependency of gain on temperature, density and pellet radius is studied using Runge–Kutta method. The obtained results show that the energy gain will be maximized at the initial temperature 35 keV, density, 5000 g/cm3 and ratio impurity of 6 Li , 0.05.

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Time-dependent measurement of high-power laser light reflection by low-Z foam plasma

High Power Laser Science and Engineering ◽

10.1017/hpl.2021.27 ◽

2021 ◽

Vol 9 ◽

Author(s):

M. Cipriani ◽

S. Yu. Gus’kov ◽

F. Consoli ◽

R. De Angelis ◽

A. A. Rupasov ◽

...

Keyword(s):

Inertial Confinement Fusion ◽

Diagnostic Techniques ◽

Experimental Results ◽

Time Dependent ◽

Light Reflection ◽

Inertial Confinement ◽

Solid Media ◽

Dependent Measurement ◽

Laser Produced Plasma ◽

Confinement Fusion

Abstract Porous materials have many applications for laser–matter interaction experiments related to inertial confinement fusion. Obtaining new knowledge about the properties of the laser-produced plasma of porous media is a challenging task. In this work, we report, for the first time to the best of our knowledge, the time-dependent measurement of the reflected light of a terawatt laser pulse from the laser-produced plasma of low-Z foam material of overcritical density. The experiments have been performed with the ABC laser, with targets constituted by foam of overcritical density and by solid media of the same chemical composition. We implemented in the MULTI-FM code a model for the light reflection to reproduce and interpret the experimental results. Using the simulations together with the experimental results, we indicate a criterion for estimating the homogenization time of the laser-produced plasma, whose measurement is challenging with direct diagnostic techniques and still not achieved.

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Effects of various parameters on numerical simulations of inertial confinement fusion hohlraum and radiation hydrodynamics

Laser and Particle Beams ◽

10.1017/s0263034601192165 ◽

2001 ◽

Vol 19 (2) ◽

pp. 259-265 ◽

Cited By ~ 16

Author(s):

N.K. GUPTA ◽

B.K. GODWAL

Keyword(s):

Inertial Confinement Fusion ◽

Radiation Transport ◽

Gold Foil ◽

Scaling Law ◽

Aluminum Foil ◽

High Energy ◽

Radiation Temperature ◽

Inertial Confinement ◽

Confinement Fusion ◽

Indirect Drive

In this article, we study the effect of various parameters on the estimation of radiation temperature inside an indirect drive ICF hohlraum and also study the hydrodynamics of aluminum and gold foils driven by the hohlraum radiation. A multigroup one-dimensional, radiation hydrodynamic code is used for this study. Opacities are calculated using a screened hydrogenic average atom model. We also investigate the opacities of Au-Sm and Au-Gd mixtures. It is shown that the mixing of two high Z materials can lead to an enhancement in the Rosseland means, which is of direct interest in indirect-drive inertial confinement fusion. The radiation temperature inside a cylindrical hohlraum is seen to be strongly dependent on the number of frequency groups used. One group radiation transport underpredicts the radiation temperature. It is shown that erroneous results can be obtained if the space mesh in the hohlraum wall is not fine enough. The spectrum of the radiation inside the hohlraum is seen to be different from Planck, especially in the high-energy range. This may lead to preheating of the target. Hydrodynamics of an aluminum foil driven by the hohlraum radiation is also presented in this article. A scaling law for the radiation-driven shock-wave speed in the gold foil is obtained.

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Time-Dependent Nuclear Measurements of Mix in Inertial Confinement Fusion

Physical Review Letters ◽

10.1103/physrevlett.98.215002 ◽

2007 ◽

Vol 98 (21) ◽

Cited By ~ 23

Author(s):

J. R. Rygg ◽

J. A. Frenje ◽

C. K. Li ◽

F. H. Séguin ◽

R. D. Petrasso ◽

...

Keyword(s):

Inertial Confinement Fusion ◽

Time Dependent ◽

Inertial Confinement ◽

Confinement Fusion

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Analysis of electroless nickel thin films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100086854 ◽

1991 ◽

Vol 49 ◽

pp. 510-511 ◽

Cited By ~ 1

Author(s):

C. W. Price ◽

E. F. Lindsey

Keyword(s):

Thin Films ◽

Inertial Confinement Fusion ◽

Electroless Nickel ◽

Inertial Confinement ◽

Plating Bath ◽

X Ray ◽

Nickel Thin Films ◽

Nickel Deposits ◽

Confinement Fusion ◽

Thickness Measurements

Thickness measurements of thin films are performed by both energy-dispersive x-ray spectroscopy (EDS) and x-ray fluorescence (XRF). XRF can measure thicker films than EDS, and XRF measurements also have somewhat greater precision than EDS measurements. However, small components with curved or irregular shapes that are used for various applications in the the Inertial Confinement Fusion program at LLNL present geometrical problems that are not conducive to XRF analyses but may have only a minimal effect on EDS analyses. This work describes the development of an EDS technique to measure the thickness of electroless nickel deposits on gold substrates. Although elaborate correction techniques have been developed for thin-film measurements by x-ray analysis, the thickness of electroless nickel films can be dependent on the plating bath used. Therefore, standard calibration curves were established by correlating EDS data with thickness measurements that were obtained by contact profilometry.

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