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Showing 1 to 15 of 15 for “"warm dense matter"”.
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Electronic structure of warm dense matter
The electronic structure of warm dense matter has been investigated using absorption spectroscopy by looking at shifts in the K-edge position of shocked compressed parylene-C and potassium chloride. The Vulcan laser facility was used to drive double sided shocks into the embedded chlorine samples …
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XUV probing of warm dense matter
… to test models of free-free absorption in warm dense aluminium by Iglesias, Shaffer et al. and Hollebon et al., Radiative heating using L-shell x-rays from a high temperature palladium plasma was used to heat an aluminium foil to a temperature of 0.9±0.23eV. Before the sample could …
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EXPERIMENTALLY MEASURING THERMAL CONDUCTIVITY IN WARM DENSE MATTER USING FRESNEL DIFFRACTIVE RADIOGRAPHY
… are less well known, and for conditions known as warm dense matter - found most commonly inside large planets and dwarf stars - we require experimental benchmarking to ensure accurate theoretical and computational work in this regime. This dissertation details the development of the Fresnel …
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Extending the dielectric formalism in warm dense matter: collisions, dynamic structure factors, and stopping powers
Warm dense matter (WDM) is characterized as having temperatures above about 11 605 K and roughly solid densities. Occupying a region in phase space somewhere between hot, sparse plasmas and cool, condensed matter, WDM conditions exist within astrophysical objects, and are created for fractions of a …
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Computational study of hot electron generation and energy transport in intense laser produced hot dense matter
… high temperature of keV (1 keV ~ 11,000,0000 K). Matter in such extreme states is par- ticularly interesting for (HED) physics such as laboratory studies of planetary and stellar astrophysics, laser fusion research, pulsed neutron source etc. To date however, the physics in HED plasma, especially, …
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Extreme ultraviolet probing of laser ablation
… using the POLLUX code show how the presence of warm, dense material leads to strong absorption of the probe beam. Methods using both broad and narrowband EUV wavelength probes for benchmarking theoretical models of opacity are presented. An iron opacity experiment conducted at the Bhabha Atomic …
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Verification and Validation of Magnetohydrodynamics Simulations of Electrically Exploded Conductors
Dense Z-pinches, magnetically-driven flyer plates, and electrically exploded wires and foils all take advantage of the extreme Lorentz forces and/or Ohmic heating generated by intense electrical current pulses through an initially solid conductor. Magnetohydrodynamics (MHD) simulations are used to …
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Developments in the Theory of X-ray Absorption and Compton Scattering.
… as a function of temperature and density in the warm dense matter (WDM) regime. I compare my thermally disordered calculations of electron momentum density (EMD) with perfect crystal calculations, using effective temperature to quantitatively describe the differences. I conclude that solid state …
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Development of implicit kinetic simulation methods, and their application to ion beam propagation in current and future neutralized drift compression experiments
… to study phase transition from the solid to the Warm Dense Matter state. The Neutralized Drift Compression Experiment (NDCX) at the Lawrence Berkeley National Laboratory is being used to investigate the possibility of developing drivers for the heavy ion fusion reactors, and for Warm Dense Matter …
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Characterization of short-pulse laser-produced fast electrons by 3D hybrid particle-in-cell modeling of angularly resolved bremsstrahlung
… of secondary particle sources, the creation of warm dense matter (WDM), advanced fusion concepts, and intense x-ray radiation for probing complex high areal density objects and inertial confinement fusion (ICF) fusion cores. However, determining laser-driven fast electron characteristics, …
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Using fusion-product spectroscopy to diagnose inertial confinement fusion implosions and study stopping power on OMEGA, the NIF, and Z
… and measuring the stopping power of Warm Dense Matter (WDM) plasmas has been developed. Understanding stopping power in this regime is critical for probing areal densities in the high-density fuel of ICF implosions. The platform uses X-ray Thomson Scattering (XRTS) to characterize the …
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Path integral Monte Carlo and the electron gas
… and temperatures in order to map out the warm-dense matter regime. The electron gas can be a representative model for a host of real systems, from simple medals to stellar interiors. However, its most common use is as input into density functional theory. To this end, we aim to build an …
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Using fusion-product spectroscopy to study inertial fusion implosions, stopping power, and astrophysical nucleosynthesis at OMEGA and the NIF
… implosions, measure charged-particle stopping in dense plasmas to high accuracy, and study reactions relevant to nuclear astrophysics. 'Surrogate' plastic-shell implosions at the National Ignition Facility with D³He fuel produce 14.7-MeV protons. Spectrometry capability developed for the NIF has …
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Radiographic applications and control of TNSA proton beams
… from these targets have been used to produce warm dense matter states, and the properties of the ion beams diagnosed. Substantial improvements in the maximum temperature attainable in heated samples have been made, along with general improvements in the quality of equation of state (EoS) data, …
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Experimental studies of the electrothermal instability using electrically thick, coated metal
The electrothermal instability (ETI) plays an important role in the thermal and hydrodynamic uniformity of metallic systems carrying electrical current densities greater than approximately 1 MA/mm^2. Most importantly, the stratified form of the ETI generates and amplifies temperature and …