A5102881918- Laser Design and Applications
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Optical Systems and Laser Technology
- Advanced Optical Sensing Technologies
- Laser Material Processing Techniques
- Solid State Laser Technologies
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Advanced Fiber Laser Technologies
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Surface Roughness and Optical Measurements
- Fusion materials and technologies
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Atomic and Molecular Physics
- Advanced X-ray and CT Imaging
- Ocular and Laser Science Research
- High-Energy Particle Collisions Research
- Welding Techniques and Residual Stresses
- Optical Polarization and Ellipsometry
Lawrence Livermore National Laboratory
2011-2024
Los Alamos National Laboratory
2021
Pacific Northwest National Laboratory
2019
University of Central Florida
2019
Laser Zentrum Hannover
2019
University of New Mexico
2019
Shawnee Mission Medical Center
2014
The University of Texas at Austin
2007
Association of Research Libraries
2001
National Technical Information Service
2001
The National Ignition Facility (NIF) is the world's largest laser system. It contains a 192 beam neodymium glass that designed to deliver 1.8 MJ at 500 TW 351 nm in order achieve energy gain (ignition) deuterium-tritium nuclear fusion target. To meet this goal, design criteria include ability generate pulses of up total energy, with peak power and temporal pulse shapes spanning 2 orders magnitude third harmonic (351 or 3omega) wavelength. focal-spot fluence distribution these carefully...
Enhanced safety and performance improvements have been made to the liquid-wall HYLIFE reactor, yielding current HYLIFE-II conceptual design. Liquid lithium has replaced with a neutronically thick array of flowing molten-salt jets (Li2BeF4 or Flibe), which will not burn, low tritium solubility inventory, protects chamber walls, giving robust design 30-yr lifetime. The inventory is 0.5 g in molten salt 140 metal tube where it less easily released. 5-MJ driver recirculating induction...
Shock ignition, an alternative concept for igniting thermonuclear fuel, is explored as a new approach to high gain, inertial confinement fusion targets the National Ignition Facility (NIF). Results indicate yields of $\ensuremath{\sim}120--250\text{ }\text{ }\mathrm{MJ}$ may be possible with laser drive energies 1--1.6 MJ, while gains $\ensuremath{\sim}50$ still achievable at only $\ensuremath{\sim}0.2\text{ energy. The scaling NIF energy gain found $G\ensuremath{\sim}126E\text{...
The National Ignition Facility (NIF) at Lawrence Livermore Laboratory, is the first of its kind megajoule-class laser facility with 192 beams capable delivering over 1.8 MJ and 500TW 351 nm light for high accuracy laser-matter interaction experiments. It has been commissioned operated since 2009 to support a wide range missions including study inertial confinement fusion, energy density physics, material science, laboratory astrophysics. In section this paper we discuss current status...
Compound parabolic concentrator (CPC) targets are utilized at the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser to enhance acceleration of electrons and production high energy photons, for durations 10 ps energies up 2.4 kJ. A large enhancement mean electron (>2 ×) photon brightness (>10×) is found with CPC compared flat targets. Using multiple diagnostic techniques different spatial locations scaling by gold activation data, spectra characterized...
Installation and commissioning of the first forty-eight Final Optics Assemblies on National Ignition Facility was completed this past year. This activity culminated in delivery light to a target. The final optics design is described selected results from first-article performance tests are presented.
The Advanced Radiographic Capability (ARC) laser system at the National Ignition Facility (NIF) is designed to ultimately provide eight beamlets with a pulse duration adjustable from 1 30 ps, and energies up 1.5 kJ per beamlet. Currently, four have been commissioned. In first set of 6 commissioning target experiments, individual were fired onto gold foil targets energy beamlet 20–30 ps length. x-ray distribution measured, yielding conversion efficiencies 4–9 × 10−4 for x-rays greater than 70...
New short-pulse kilojoule, Petawatt-class lasers, which have recently come online and are coupled to large-scale, many-beam long-pulse facilities, undoubtedly serve as very exciting tools capture transformational science opportunities in high energy density physics. These lasers also happen reside a unique laser regime: high-energy (kilojoule), relatively long (multi-picosecond) pulse-lengths, large (10s of micron) focal spots, where their use driving energetic particle beams is largely...
The implosion efficiency in inertial confinement fusion depends on the degree of stagnated fuel compression, density uniformity, sphericity, and minimum residual kinetic energy achieved. Compton scattering-mediated 50--200 keV x-ray radiographs indirect-drive cryogenic implosions at National Ignition Facility capture dynamic evolution as it goes through peak revealing low-mode 3D nonuniformities thicker with lower than simulated. By differencing two taken different times during same...
With the first four of its eventual 192 beams now executing shots and generating more than 100 kJ laser energy at primary wavelength 1.06 µm, National Ignition Facility (NIF) Lawrence Livermore Laboratory is already world's largest most energetic laser. The optical system performance requirements that are in place for NIF derived from goals missions it designed to serve. These include inertial confinement fusion (ICF) research study matter extreme densities pressures. mission have led a...
Both constitutive secretion and Ca(2+)-regulated exocytosis require the assembly of soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) complexes. At present, little is known about how SNARE complexes mediating these two distinct pathways differ in structure. Using Drosophila neuromuscular synapse as a model, we show that mutation modifying hydrophobic layer syntaxin 1A regulates rate vesicle fusion. Syntaxin molecules share highly conserved threonine C-terminal +7...
Acquisition measurements of the round-trip travel time light, from McDonald Observatory to Laser Ranging Retro-Reflector deployed on moon by Apollo 11 astronauts, were made 20 August and 3, 4, 22 September 1969. The uncertainty in was +/- 15 nanoseconds, with pulsed ruby laser timing system used for acquisition. later a planned long-term sequence this observatory is expected be an order magnitude smaller. successful performance retro-reflector at several angles solar illumination, as well...
Picosecond-scale laser–matter interactions using compound parabolic concentrators have demonstrated strongly relativistic ponderomotive effects with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mo>∼</mml:mo> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mn>10</mml:mn> </mml:mrow> <mml:mo>×</mml:mo> </mml:math> increase in x-ray source brightness, positron production and multi-MeV proton acceleration versus flat targets, a marginally intensity laser.
Relativistic electron temperatures were measured from kilojoule, subrelativistic laser-plasma interactions. Experiments show an order of magnitude higher than expected a ponderomotive scaling, where up to 2.2 MeV generated using intensity 1×10^{18}W/cm^{2}. Two-dimensional particle-in-cell simulations suggest that electrons gain superponderomotive energies by stochastic acceleration as they sample large area rapidly changing laser phase. We demonstrate such high are possible intensities...
The performance of the National Ignition Facility (NIF), especially in terms laser focusability, will be determined by several key factors. One these factors is optical specification thousands large aperture optics that comprise 192 beamlines. We have previously reported on importance power spectral density (PSD) NIF performance. Recently, we been studying long spatial wavelength phase errors focusability. concluded preferred metric for determining impact rms gradient. In this paper, outline...
The advanced radiographic capability (ARC) laser system, part of the National Ignition Facility (NIF) at Lawrence Livermore Laboratory, is a short-pulse integrated into NIF. ARC designed to provide adjustable pulse lengths <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>∼</mml:mo> </mml:mrow> <mml:mn>1</mml:mn> <mml:mo>−</mml:mo> <mml:mn>38</mml:mn> <mml:mspace width="thickmathspace"/> <mml:mi...
The National Ignition Facility (NIF) at Lawrence Livermore Laboratory contains a 192-beam 3.6 MJ neodymium glass laser that is frequency converted to 351nm light. It has been designed support high energy density science (HEDS), including the demonstration of fusion ignition through Inertial Confinement. To meet this goal, design criteria include ability generate pulses up 1.8-MJ total 351nm, with peak power 500 TW and precisely-controlled temporal pulse shapes spanning two orders magnitude....
Controlled nuclear fusion initiated by highly intense laser beams has been the subject of experiment for many years. The National Ignition Facility (NIF) represents culmination design efforts to provide a facility that will successfully demonstrate ignition in laboratory. In this so-called inertial confinement approach, energetic driver (laser, X ray, or charged particle) heat outer surface spherical capsule containing deuterium and tritium (DT) fuel. As explosively evaporates, reaction...
With the first four of its eventual 192 beams now executing shots, National Ignition Facility (NIF) at Lawrence Livermore Laboratory is already world's largest and most energetic laser. The optical system performance requirements that are in place for NIF derived from goals missions it designed to serve. These include inertial confinement fusion (ICF) research study matter extreme energy densities pressures. mission have led a design strategy achieving high quality focusable power laser...
The National Ignition Facility (NIF) is a stadium-sized facility containing 192-beam, 1.8 MJ, 500-TW, 351-nm laser system together with 10-m diameter target chamber room for many diagnostics. NIF will be the world's largest experimental system, providing national center to study inertial confinement fusion and physics of matter at extreme energy densities pressures. A computational Laser Performance Operations Model (LPOM) has been developed deployed that automates setup process, accurately...
The advanced radiographic capability located at the National Ignition Facility (NIF) uses high intensity, short pulse lasers to create bright photon sources for diagnosing energy density experiments. There are needs a multi-frame time-resolved MeV gamma diagnostic experiments on NIF with sub-nanosecond resolution. A series of demonstrated measurements x-ray spectra resolved time separation few nanoseconds through use gas Cherenkov detectors. two-pulse experiment found 30% reduction in...
A multi-wavelength laser based system has been constructed to measure defect induced beam modulation (diffraction) from ICF class optics. The Nd:YLF-based measurement (MMS) uses simple collimation and imaging capture diffraction patterns optical defects onto an 8-bit digital camera at 1053, 527 351 nm. a field of view 4.5 x 2.8 mm{sup 2} is capable any plane 0 30 cm downstream the defect. calibrated using 477 micron chromium dot on glass for which were calculated numerically. Under nominal...
The predicted focal spot size of the National Ignition Facility laser is parameterized against finish quality optics in system. Results are reported from simulations which include static aberrations, as well pump-induced distortions, beam self-focusing, and effect an adaptive optic. do not contributions mounting errors, residual thermal noise slabs previous shots, air turbulence, a kinoform phase plate, or smoothing by spectral dispersion. Consequently, these results represent `first shot...
A single beamline of the National Ignition Facility (NIF) has been operated at a wavelength 526.5 nm (2 omega) by frequency converting fundamental 1053 (1 with an 18.2 mm thick type-I potassium dihydrogen phosphate (KDP) second-harmonic generator (SHG) crystal. Second-harmonic energies up to 17.9 kJ were measured final optics focal plane conversion efficiency 82%. For similarly configured 192-beam NIF, this scales total 2 omega energy 3.4 MJ full NIF equivalent (FNE).