A5022733024- Laser-induced spectroscopy and plasma
- Laser-Plasma Interactions and Diagnostics
- Atomic and Molecular Physics
- Laser-Matter Interactions and Applications
- Magnetic confinement fusion research
- Energetic Materials and Combustion
- Refrigeration and Air Conditioning Technologies
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Combustion and Detonation Processes
- Heat Transfer and Optimization
- Mass Spectrometry Techniques and Applications
- High-pressure geophysics and materials
- Solar and Space Plasma Dynamics
- Laser Design and Applications
- Plasma Diagnostics and Applications
- Heat Transfer and Boiling Studies
- Cold Fusion and Nuclear Reactions
- Calibration and Measurement Techniques
- Geotechnical and Geomechanical Engineering
- Ionosphere and magnetosphere dynamics
- Gas Dynamics and Kinetic Theory
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
University of Nevada, Reno
2012-2024
Technical University of Denmark
2018-2019
General Atomics (United States)
2017
Lawrence Livermore National Laboratory
2015-2017
University of Rochester
2017
Los Alamos National Laboratory
2017
Computational Sciences (United States)
2017
Prism Computational Sciences (United States)
2017
Energetics (United States)
2017
Eindhoven University of Technology
2015
Ignition of an inertial confinement fusion (ICF) target depends on the formation a central hot spot with sufficient temperature and areal density. Radiative conductive losses from can be enhanced by hydrodynamic instabilities. The concentric spherical layers current National Facility (NIF) ignition targets consist plastic ablator surrounding thin shell cryogenic thermonuclear fuel (i.e., hydrogen isotopes), vapor filling interior volume [S. W. Haan et al., Phys. Plasmas 18, 051001 (2011)]....
The first systematic study of opacity dependence on atomic number at stellar interior temperatures is used to evaluate discrepancies between measured and modeled iron [J. E. Bailey et al., Nature (London) 517, 56 (2015)NATUAS0028-083610.1038/nature14048]. High-temperature (>180 eV) chromium nickel opacities are with ±6%-10% uncertainty, using the same methods employed in previous experiments. 10%-20% experiment reproducibility demonstrates reliability. overall model-data disagreements...
Solar power generation has been gaining worldwide increasing interest by virtue of its ability to meet both the growing energy needs and concerns on carbon dioxide emissions. One most promising Concentrated Power (CSP) technologies under development uses a parabolic dish concentrate solar into focal point, raising thetemperature working fluid which is then used in thermodynamic cycle generate electricity. In OMSoP project, funded European Commission, it proposed use Brayton form micro-gas...
We discuss the modeling of population kinetics nonequilibrium steady-state plasmas using a collisional-radiative model and code based on analytical rates (ABAKO). ABAKO can be applied to low-to-high $Z$ ions for wide range laboratory plasma conditions: coronal, local thermodynamic equilibrium or nonlocal equilibrium, optically thin thick plasmas. combines set approximations atomic rates, which yield substantial savings in computer running time, still comparing well with more elaborate codes...
Analysis is presented of K- and L-shell spectra obtained from Ar Xe dopants seeded into the fuel region plastic capsules indirectly imploded using Nova laser. Stark broadening measurements n=3-1 lines in H- He-like (Ar Ly-β He-β, respectively) are used to infer electron density, while spatially averaged temperature deduced ratio intensities these lines. Systematic variations spectral features observed as a function drive conditions. A postprocessing code has been developed simulate...
Escape factors for upper and lower limits to the source function appropriate spherical geometry have been evaluated using a set of Stark-broadened line profiles, computed with different approximations, Lyman- alpha argon XVIII. The method used compute escape factors, which is based on general formalism can be applied any kind profile suitable geometry. Comparisons are made previous calculations that Holtsmarkian profiles significant differences noted.
We present a brief review on the atomic kinetics, modeling and interpretation of astrophysical observations, laboratory astrophysics experiments. The emphasis is benchmarking opacity calculations relevant for solar structure models, photoionized plasmas research, magnetohydrodynamic numerical simulation accretion disk dynamics, connection between radiation transport effects plasma source geometry details. Specific cases application are discussed with relevance to recent proposed experiments...
We report on the analysis of time-resolved x-ray spectra from direct-drive, Ar-filled polymer shell implosion experiments in which we trace time evolution electron density through stagnation. Very high densities range 2--8\ifmmode\times\else\texttimes\fi{}${10}^{24}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$ are inferred. also discuss several novel spectral features, including large Stark broadening satellite line emission, optical thicknesses for resonant transitions lower than expected,...
We present narrow-band self-emission x-ray images from a titanium tracer layer placed at the fuel-shell interface in 60-laser-beam implosion experiments OMEGA facility. The are acquired during deceleration with inferred convergences of $\ensuremath{\sim}9--14.$ Novel here is that systematically observed asymmetry emission linked, using full sphere 3D modeling, to performance-limiting low mode drive.
Abstract Since the observation of first brown dwarf in 1995, numerous studies have led to a better understanding structures these objects. Here we present method for studying material resistivity warm dense plasmas laboratory, which relate microphysics dwarfs through viscosity and electron collisions. use X-ray polarimetry determine sulphur-doped plastic target heated Brown Dwarf conditions by an ultra-intense laser. The is determined matching plasma physics model atomic calculations...
We have modeled the temperature and density dependence of Li-like satellites Ar He β line by performing NLTE kinetic modeling level populations in conjunction with Stark broadening calculations. Composite profiles are computed including resonance satellite transitions that built-in characteristic these transitions. These synthetic spectra can be used to analyze experimental data, providing a simultaneous diagnostic density.
Theoretical spectral-line profiles have been obtained for dielectronic satellite transitions in heliumlike and lithiumlike argon ions. Particular emphasis has given to the systematic self-consistent incorporation of non-local-thermodynamic-equilibrium autoionizing-level populations, together with line-broadening effects, which are due autoionization processes, radiative transitions, electron collisions, action plasma ion-produced electric microfields. An investigation carried out effects...
The COVID-19 pandemic exacerbated the use of medical protective equipment, including face masks, to protect individual from virus. This work studies feasibility using these materials as fuel for thermochemical processes production syngas. A preliminary physic-chemical characterization was made by means moisture and ash determination, thermogravimetric analysis, X-ray fluorescence. Afterward, pyrolysis gasification tests were executed in a laboratory-scale fluidized bed reactor with...
A new program of research into the physics dense z-pinches is being initiated around a high-repetition-rate two-terawatt generator (formerly Zebra/HDZP-II: 2MV, 1.2 MA, 100 ns, 200 kJ, 1.9 Ω final line impedance) transferred to University Nevada. Reno Physics Department from Los Alamos National Laboratory. Areas for study include early-time evolution current-driven wire, plasma turbulence and between wires, suppression or reduction instabilities, nature x-ray bright spots, tailoring emission...
X-ray satellite line emission from targets irradiated by intense-light ion beams can be used to diagnose plasma conditions and beam properties. We present results our analysis of spectroscopic measurements x-ray K\ensuremath{\alpha} satellites emitted a target an beam. In this experiment, performed on the Particle Beam Fusion Accelerator-II device at Sandia, Al was with 4--6 MeV proton peak power density 1--2 TW/${\mathrm{cm}}^{2}$. Up 15% electrical current in form carbon contaminants. A...
We examine the theoretical line spectra from hydrogenlike argon in electron-number-density range of ${10}^{24--}$${10}^{25}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$ and at a temperature corresponding to kT=800 eV. At these high densities it is important address relevance higher-order plasma-ion microfield effects on spectral shape. begin by calculating shapes using electric-field-dependent matrix elements that are constructed wave functions which solutions Schr\"odinger's equation for...