A5070948810- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Fluid Dynamics and Turbulent Flows
- Gas Dynamics and Kinetic Theory
- Combustion and Detonation Processes
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Advanced X-ray Imaging Techniques
- Magnetic confinement fusion research
- Energetic Materials and Combustion
- High-Velocity Impact and Material Behavior
- Computational Fluid Dynamics and Aerodynamics
- Particle Dynamics in Fluid Flows
- Fluid Dynamics and Vibration Analysis
- Aerodynamics and Fluid Dynamics Research
- Spacecraft and Cryogenic Technologies
- Aerogels and thermal insulation
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Planetary Science and Exploration
- Fluid Dynamics and Heat Transfer
- X-ray Spectroscopy and Fluorescence Analysis
Los Alamos National Laboratory
2015-2024
Government of the United States of America
2024
Energetics (United States)
2020-2022
University of Rochester
2020-2022
University of Leicester
2020
Georgetown University
2020
University of Kansas
2020
Lawrence Livermore National Laboratory
2018-2020
Virginia Tech
2020
Ben-Gurion University of the Negev
2020
Laser-plasma interactions in the novel regime of relativistically induced transparency (RIT) have been harnessed to generate intense ion beams efficiently with average energies exceeding 10 MeV/nucleon (>100 MeV for protons) at "table-top" scales experiments LANL Trident Laser. By further optimization laser and target, RIT has extended into a self-organized plasma mode. This mode yields an beam much narrower energy spread while maintaining high conversion efficiency. involves self-generation...
Abstract The injection and mixing of contaminant mass into the fuel in inertial confinement fusion (ICF) implosions is a primary factor preventing ignition. ICF experiments have recently achieved an alpha-heating regime, which self-heating dominant source yield, by reducing susceptibility to instabilities that inject this mass. We report results unique separated reactants implosion studying pre-mixed as well detailed high-resolution three-dimensional simulations are good agreement with...
Rayleigh-Taylor instability growth is shown to be hydrodynamically scale invariant in convergent cylindrical implosions for targets that varied radial dimension and implosion timescale by a factor of 3. The were driven directly laser irradiation providing short impulse, at an embedded aluminum interface occurs as it converges radially inward 2.25 decelerates on central foam core. Late-time factors 14 are observed single-mode m=20 azimuthal perturbation both scales, despite the differences...
Double shell inertial confinement fusion is a concept for achieving robust thermonuclear burn that uses dense metal shells to compress deuterium-tritium (DT) fuel conditions. implosions are typically indirectly driven and involve target consists of low-Z ablator, foam layer, high-Z pusher surrounding the DT fuel. The goal campaign achieve volumetric as radiation losses from trapped by opaque shell. overall performance double relies on efficient collisional transfer kinetic energy between...
Recently, Richtmyer-Meshkov instability (RMI) experiments driven by high explosives and fielded with perturbations on a free surface have been used to study strength at extreme strain rates near zero pressure. The RMI reported here impact loading, which is experimentally simpler, more accurate analyze, also allows the exploration of wider range conditions. Three were performed tantalum shock stresses from 20 34 GPa, six different perturbation sizes each level, making this most comprehensive...
We have developed an experimental platform at the National Ignition Facility that employs colliding planar shocks to produce warm dense matter with uniform conditions and enable high-precision equation of state measurements. The uses simultaneous x-ray Thomson scattering radiography measure density, electron temperature, ionization in matter. is designed create a large volume plasma (approximately 700×700×150μm3) pressures approaching 100 Mbar minimize distribution volume, significantly...
The National Ignition Facility (NIF) is scheduled to begin deuterium-tritium (DT) shots possibly in the next several years. One of important diagnostics understanding capsule behavior and guide changes Hohlraum illumination, design, geometry will be neutron imaging both primary 14 MeV neutrons lower-energy downscattered 6–13 range. system (NIS) described here, which we are currently building for use on NIF, uses a precisely aligned set apertures near target form images segmented...
A well diagnosed campaign of supersonic, diffusive radiation flow experiments has been fielded on the National Ignition Facility. These have used accurate measurements delivered laser energy and foam density to enable an investigation into SESAME's tabulated equation-of-state values CASSANDRA's predicted opacity for low-density C8H7Cl throughout campaign. We report that results from initial simulations under-predicted arrival time wave through by ≈22%. simulation study was conducted...
Mix of ablator material into fuel an ICF capsule adds non-burning material, diluting the and reducing burn. The amount reduction is dependent in part on morphology mix. A probability distribution function (PDF) burn model has been developed [6] that utilizes average concentration mixed materials as well variance this quantity across cells provided by BHR turbulent transport [3] its revisions [4] to describe mix terms a PDF concentrations provides rate material. Work underway develop MARBLE...
Using a large volume high-energy-density fluid shear experiment ($8.5\text{ }\text{ }{\mathrm{cm}}^{3}$) at the National Ignition Facility, we have demonstrated for first time ability to significantly alter evolution of supersonic sheared mixing layer by controlling initial conditions that layer. By altering surface roughness tracer foil, demonstrate transition from highly ordered system coherent structures randomly with faster growing mix layer, indicative strong in temperature several tens...
The MARBLE project is a novel inertial confinement fusion platform for studying the development of atomic mixing and temperature equilibration in implosions their impact on thermonuclear burn. Experiments involve laser-driven implosion capsules filled with deuterated engineered foams whose pores are gaseous mixture hydrogen tritium. By varying size foam pores, we can study timescale mix relative to thermal equilibrium between species. In contrast, previous separated reactant experiments have...
In inertial confinement fusion, deuterium–tritium (DT) fuel is brought to densities and temperatures where fusion ignition occurs. However, mixing of the ablator material into may prevent by diluting cooling fuel. MARBLE experiments at National Ignition Facility provide new insight how affects thermonuclear burn. These use laser-driven capsules containing deuterated plastic foam tritium gas. Embedded within are voids known sizes locations, which control degree heterogeneity Initially,...
Abstract Laser-based compact MeV X-ray sources are useful for a variety of applications such as radiography and active interrogation nuclear materials. X rays typically generated by impinging the intense laser onto ~mm-thick high-Z foil. Here, we have characterized source from 120 TW (80 J, 650 fs) interaction with 1 mm-thick tantalum Our measurements show temperature 2.5 MeV, flux 3 × 10 12 photons/sr/shot, beam divergence ~0.1 sr, conversion efficiency ~1%, that is, ~1 J out 80 incident...
We present recent results of equation-of-state (EOS) measurements shocked silica (${\mathrm{SiO}}_{2}$) aerogel foam at the OMEGA laser facility. Silica is an important low-density pressure standard used in many high energy density experiments, including novel technique shock and release. Due to its applications, it has been a heavily studied material well-known Hugoniot curve. This work then complements velocity with additional temperature data providing full EOS information within warm...
The LANL Shear Campaign uses millimeter-scale initially solid shock tubes on the National Ignition Facility to conduct high-energy-density hydrodynamic plasma experiments, capable of reaching energy densities exceeding 100 kJ/cm3. These shock-tube experiments have for first time reproduced spontaneously emergent coherent structures due shear-based fluid instabilities [i.e., Kelvin-Helmholtz (KH)], demonstrating scaling over 8 orders magnitude in and velocity. KH vortices, referred as...
Imperfections at the interface between ablator and fuel in an ICF capsule can give rise Richtmyer-Meshkov instability (RMI). The effects of multiple shocks on this impulse-driven has been well studied traditional, low energy density (LED) regimes, but work is limited high (HED) regime. Instability turbulent characteristics are difficult to diagnose capsule, with its three dimensional converging geometry. This paper highlights platform development a new planar HED experiment OMEGA NIF laser...
Deceleration-phase Rayleigh–Taylor instability (RTI) growth during inertial confinement fusion capsule implosions significantly affects the performance as it mixes cold ablator material into fuel. Precise measurements of such are essential for both validating existing simulation codes and improving our predictive capability. RTI on inner surface a spherical shell limited often inferred indirectly at convergence. In contrast, cylindrical allow direct diagnostic access to converging interface...
We propose a new approach to inertial confinement fusion (ICF) that could potentially lead ignition and propagating thermonuclear burn at the National Ignition Facility (NIF). The proposal is based upon combination of two concepts, referred as polar direct drive liquid deuterium–tritium wetted foam capsules. With this concept, 2D radiation hydrodynamic simulations indicate ICF are possible with laser power energy capabilities available today on NIF.
Precise characterization of experimental radiation flow is required to validate the high energy density physics models, numerical methods, and codes that are used simulate radiation-hydrodynamics phenomena such as thermal transport in stochastic media. The Cassio code through inhomogeneous, stochastic-media-foam configurations containing optically thick clumps dispersed within an thin background aerogel. can model small inhomogeneous problems directly, but most require approximations meet...