D. Martinez
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View article: Demonstration of improvement of energy conversion rate from kJ PW laser to protons with electron confinement
Demonstration of improvement of energy conversion rate from kJ PW laser to protons with electron confinement Open
Kilojoule-class relativistic intensity lasers can produce energetic protons with high energy conversion efficiencies in the interaction with a thin foil target. Using the national ignition facility advanced radiographic capability (NIF-ARC…
Development and scaling of MeV x-ray radiography at NIF-ARC Open
We investigate the generation of MeV x-rays using the Advanced Radiography Capability laser system at the National Ignition Facility using 1, 10, and 38 ps pulse durations, with laser energies reaching up to 4 kJ and using compound parabol…
Comprehensive Management of Facial Burns from Boiler Explosion: Case Report Open
A 22-year-old male patient suffered an extensive facial burn after the accidental explosion of a domestic boiler. The burn involved the forehead, eyelids, nose, cheeks, lips, and chin, representing approximately 18% of total body surface a…
View article: Ultra-fast single-crystal CVD diamonds in the particle time-of-flight (PTOF) detector for low yield burn-history measurements on the NIF (invited)
Ultra-fast single-crystal CVD diamonds in the particle time-of-flight (PTOF) detector for low yield burn-history measurements on the NIF (invited) Open
The Particle Time of Flight (PTOF) diagnostic is a chemical vapor deposition diamond-based detector and is the only diagnostic for measuring nuclear bang times of low yield (<1013) shots on the National Ignition Facility. Recently, a compr…
Effects of drive pulse shape on graded metal pushered single shell capsule implosions on the National Ignition Facility Open
Graded metal pushered single shells (PSS) are a viable alternative to low-Z capsules (Z is the atomic number) for indirect drive inertial confinement fusion implosions due to enhanced core tamping and radiation trapping, but they can be co…
View article: Publisher's Note: “First graded metal pushered single shell capsule implosions on the National Ignition Facility” [Phys. Plasmas <b>29</b>, 052707 (2022)]
Publisher's Note: “First graded metal pushered single shell capsule implosions on the National Ignition Facility” [Phys. Plasmas <b>29</b>, 052707 (2022)] Open
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Monocular Simultaneous Localization and Mapping using Ground Textures Open
Recent work has shown impressive localization performance using only images of ground textures taken with a downward facing monocular camera. This provides a reliable navigation method that is robust to feature sparse environments and chal…
View article: Development of a bright MeV photon source with compound parabolic concentrator targets on the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser
Development of a bright MeV photon source with compound parabolic concentrator targets on the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser Open
Compound parabolic concentrator (CPC) targets are utilized at the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser to enhance the acceleration of electrons and production of high energy photons, for laser duratio…
Monte Carlo N-Particle forward modeling for density reconstruction of double shell capsule radiographs Open
In the Double Shell Inertial Confinement Fusion concept, characterizing the shape asymmetry of imploding metal shells is vital for understanding energy-efficient compression and radiative losses of the thermonuclear fuel. The Monte Carlo N…
View article: Fluid dynamic mathematical aspects of supernova remnants
Fluid dynamic mathematical aspects of supernova remnants Open
Supernovae—explosions of stars—are a central problem in astrophysics since they contain information on the entire process of stellar evolution and nucleosynthesis. Rayleigh–Taylor (RT) and Richtmyer–Meshkov (RM) instabilities, developing d…
Characterization of a 1D-imaging high-energy x-ray backlighter driven by the National Ignition Facility Advanced Radiographic Capability laser Open
Plastic deformation of samples compressed to Mbar pressures at high strain rates at the National Ignition Facility (NIF) forms the basis of ongoing material strength experiments in conditions relevant to meteor impacts, geophysics, armor d…
First graded metal pushered single shell capsule implosions on the National Ignition Facility Open
Graded metal pushered single shell (PSS) capsules are predicted to be a viable alternative to low-Z capsule indirect drive inertial confinement fusion (ICF) implosions for achieving high fusion yields [MacLaren et al., Phys. Plasmas 28, 12…
A pushered capsule implosion as an alternate approach to the ignition regime for inertial confinement fusion Open
In inertial confinement fusion, the threshold for ignition is a highly dynamic quantity as the sources and sinks of power in the hot spot can vary rapidly. In this article, we consider the ignition condition as a race between heating and d…
Plasma expansion and relativistic filamentation in intense laser-irradiated cone targets Open
Compound parabolic concentrator (CPC) cone targets have been shown to produce increased MeV photons on the NIF-ARC by 10× over flat targets. Multiple x-ray frames can potentially be generated by firing the NIF-ARC's beamlets into distinct …
View article: Enhanced integrated multiband HPM radiator, combining a hyperband source with a high-Q frequency selective surface
Enhanced integrated multiband HPM radiator, combining a hyperband source with a high-Q frequency selective surface Open
This work presents advances on the development of a resonant radiator, obtained as the augmentation of a conventional Impulse Radiating Antenna (IRA) with a Frequency Selective Surface (FSS), in the L-band. An improved passband-type FSS is…
View article: A dual high-energy radiography platform with 15 <i>μ</i>m resolution at the National Ignition Facility
A dual high-energy radiography platform with 15 <i>μ</i>m resolution at the National Ignition Facility Open
To study matter at extreme densities and pressures, we need mega laser facilities such as the National Ignition Facility as well as creative methods to make observations during timescales of a billionth of a second. To facilitate this, we …
Order-of-magnitude increase in laser-target coupling at near-relativistic intensities using compound parabolic concentrators Open
Achieving a high conversion efficiency into relativistic electrons is central to short-pulse laser application and fundamentally relies on creating interaction regions with intensities ≫10^{18}W/cm^{2}. Small focal length optics are typica…
Multi-pulse time resolved gamma ray spectroscopy of the advanced radiographic capability using gas Cherenkov diagnostics Open
The advanced radiographic capability located at the National Ignition Facility (NIF) uses high intensity, short pulse lasers to create bright photon sources for diagnosing high energy density experiments. There are radiographic needs for a…
View article: Erratum: “First demonstration of ARC-accelerated proton beams at the National Ignition Facility” [Physics of Plasmas <b>26</b>, 043110 (2019)]
Erratum: “First demonstration of ARC-accelerated proton beams at the National Ignition Facility” [Physics of Plasmas <b>26</b>, 043110 (2019)] Open
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View article: Time-Resolved Fuel Density Profiles of the Stagnation Phase of Indirect-Drive Inertial Confinement Implosions
Time-Resolved Fuel Density Profiles of the Stagnation Phase of Indirect-Drive Inertial Confinement Implosions Open
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 radiogr…
Cooling Performance Testing of Attaway's Negative Pressure CDU Open
Attaway is a recently installed High-Performance Computing (HPC) machine at Sandia National Labs that is 70% water-cooled and 30% air-cooled. This machine, supplied by Penguin Computing, uses a novel new cooling system from Chilldyne that …
Production of relativistic electrons at subrelativistic laser intensities Open
Relativistic electron temperatures were measured from kilojoule, subrelativistic laser-plasma interactions. Experiments show an order of magnitude higher temperatures than expected from a ponderomotive scaling, where temperatures of up to …
View article: FY19 LLNL Experimental Programs at Omega
FY19 LLNL Experimental Programs at Omega Open
In Fiscal Year 2019 (FY19), Lawrence Livermore National Laboratory’s (LLNL’s) High- Energy-Density Physics (HED) and Indirect Drive Inertial Confinement Fusion (ICF-ID) programs conducted numerous campaigns on the OMEGA and OMEGA-EP (EP) l…
View article: Review of hydrodynamic instability experiments in inertially confined fusion implosions on National Ignition Facility
Review of hydrodynamic instability experiments in inertially confined fusion implosions on National Ignition Facility Open
Hydrodynamic instabilities are a major factor in degradation of inertial confinement fusion (ICF) implosions. In the highest performing implosions on National Ignition Facility, yield amplification (YA) due to alpha particle heating approa…
Double HEBL 19A 1 week report [Slides] Open
Quantify resolution degradation of 2nd wire from interactions originating from 1st wire. Test three shield designs to mitigate resolution degradation.