A5018809830- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Magnetic confinement fusion research
- Nuclear reactor physics and engineering
- Polymer crystallization and properties
- Cold Fusion and Nuclear Reactions
- Solid State Laser Technologies
- Polymer Foaming and Composites
- Polymer Nanocomposites and Properties
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Spectroscopy and Laser Applications
- biodegradable polymer synthesis and properties
- Laser Material Processing Techniques
- Cyclone Separators and Fluid Dynamics
- Laser-Matter Interactions and Applications
- Particle Dynamics in Fluid Flows
- Atomic and Subatomic Physics Research
- Ion-surface interactions and analysis
- Photorefractive and Nonlinear Optics
- Hydrocarbon exploration and reservoir analysis
- Iron and Steelmaking Processes
- Plasma and Flow Control in Aerodynamics
Lawrence Livermore National Laboratory
2014-2024
University of Bradford
2021-2022
Massachusetts Institute of Technology
2014
Fusion Academy
2014
Fusion (United States)
2014
Los Alamos National Laboratory
2014
Rutherford Appleton Laboratory
2014
Sandia National Laboratories
2014
General Atomics (United States)
2014
CEA DAM Île-de-France
2014
For more than half a century, researchers around the world have been engaged in attempts to achieve fusion ignition as proof of principle various concepts. Following Lawson criterion, an ignited plasma is one where heating power high enough overcome all physical processes that cool plasma, creating positive thermodynamic feedback loop with rapidly increasing temperature. In inertially confined fusion, state can begin "burn propagation" into surrounding cold fuel, enabling possibility energy...
On December 5, 2022, an indirect drive fusion implosion on the National Ignition Facility (NIF) achieved a target gain <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>G</a:mi></a:mrow><a:mrow><a:mtext>target</a:mtext></a:mrow></a:msub></a:mrow></a:math> of 1.5. This is first laboratory demonstration exceeding “scientific breakeven” (or <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Measurement of the neutron spectrum from inertial confinement fusion implosions is one primary diagnostics implosion performance. Analysis gives access to quantities such as yield, hot-spot velocity, apparent ion temperature, and compressed fuel ρr through measurement down-scatter ratio. On National Ignition Facility, time-of-flight suite has been upgraded include five independent, collimated lines sight, each comprising a high dynamic range bibenzyl/diphenylacetylene-stilbene scintillator...
Complex and precise research targets are required for the inertial confinement fusion (ICF) experiments conducted at National Ignition Facility. During Campaign (NIC) target development team embarked on completed a science technology campaign to provide capability produce rate needed by NIC. An engineering design precision, manufacturing, fielding was developed. This new processes, tooling, equipment metrologize assemble components. In addition, of processing also required.Since NIC had...
An innovative technique has been developed and used to measure the shock propagation speed along two orthogonal axes in an inertial confinement fusion indirect drive implosion target. This development builds on existing target diagnostic platform for measuring a single axis. A 0.4 mm square aluminum mirror is installed ablator capsule which adds second view of x-ray-driven speeds. The new capability symmetry control directions shocks launched by laser-generated hohlraum x-ray flux. Laser...
The installation of a neutron imaging diagnostic with polar view at the National Ignition Facility (NIF) required design new aperture, an extended pinhole array (PHA). This PHA is different from for existing equatorial system due to significant changes in alignment and recording systems. complex set component requirements, as well space constraints its intended location, makes this aperture challenging. In addition, lessons learned development prior apertures mandate careful metrology first...
We report on two-photon absorption measurements at 213 nm of deep UV transmissible media, including LiF, MgF2, CaF2, BaF2, sapphire (Al2O3), and high-purity grades fused-silica (SiO2). A high-stability 24 ps Nd:YAG laser operating the 5th harmonic (213 nm) was used to generate a high-intensity, long-Rayleigh-length Gaussian focus inside samples. The fluoride crystals indicate coefficients between 0.004 0.82 cm/GW. find that different fused silica performed near identically for absorption;...
A new neutron imager, known as Neutron Imaging System North Pole, has been fielded to image the neutrons produced in burn region of imploding fusion capsules at National Ignition Facility. The resolution and alignment requirements parameters that drive design this system are similar pre-existing equatorial system, there significant changes. This work describes limitations driving discusses metrology alignment, shows some data from instrument.
A new neutron imager, known as Neutron Imaging System North Pole, will use an array of thick apertures to image the neutrons produced in burn region imploding fusion capsules at National Ignition Facility. While resolution requirements and parameters that drive design this are similar traditional x-ray pinhole arrays, require with narrow fields view, a precisely designed is critical allow alignment capture required images 10-μm resolution. This work describes mechanical limitations driving...
We report on results of fifth harmonic generation in Cesium Lithium Borate (CLBO) using a three-crystal cascaded frequency conversion scheme designed to study the energy balance final sum stage. The experimental setup independently combines first and fourth Nd:Glass laser 5mm thick CLBO crystal. Energy between incoming output is close unity when out phase matching approximately 80% crystal matching. A detailed analysis residual fundamental indicates 5<sup>th</sup> light being...
Reconciling the experimental and system requirements during development of a new target is one most challenging tasks in design engineering targets used National Ignition Facility. Targets for GigaBar 3 campaign were meant to allow detection extremely weak Thomson scattering from matter at extreme densities face very bright backlighter laser entry hole plasma emissions. The problem was shield detector sufficiently while maintaining beamline view clearances, observing mass restrictions. A...
Sheet specimens of a PLLA-based polymer have been extended at temperature near to the glass transition in both uniaxial and planar tension, with stress relaxation observed for some time after reaching final strain. Both axial transverse stresses were recorded experiments. In all cases during loading, yielding small strain was followed by drop true then hardening. This constant strain, which dropped reach an effectively level. Stresses modelled as steady state transient components....
Gravity dust-catchers are widely utilized in steelmaking plants to separate particles from the gas flow produced by blast furnace (BF). The BF recycle system often experiences high total suspended solid (TSS) levels with a significant increase sludge generation. This increased generation results higher costs operation, chemical treatment and removal. Due environmental limitations inside an operating dust-catcher, direct measurement of conditions can be extremely difficult. Computational...
Neutron-yield diagnostics at the NIF have been upgraded to include 48 detectors placed around target chamber assess DT-neutron-yield isotropy for inertial confinement fusion experiments. Real-time neutron-activation are used understand yield asymmetries due Doppler shifts in neutron energy attributed hotspot motion, variations fuel and ablator areal densities, other physics effects. In order isolate effects, we must contribution scattering associated with different hardware configurations...
Received 28 February 2011DOI:https://doi.org/10.1103/PhysRevLett.106.109903© 2011 American Physical Society