Madison E. Martin

Revisiting Variable Stars Toward the Globular Cluster NGC 6496 With ATLAS and Gaia Photometry

Madison E. Martin, Andrew C. Layden, Andrew McNeill

ABSTRACT We revisit 13 variable stars in the field of the metal‐rich globular cluster NGC 6496, discovered by Abbas et al. (2015; Astronomical Journal 149:40) (hereafter referred to as “MA15”) via time‐series data, spanning 2 years. We improve upon the MA15 characterization …

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Demonstration of ignition-driven radiation transport through a THOR hohlraum

Ryan Lester, B. M. Haines, H. M. Johns, L.B. Kot et autres

The achievement of fusion ignition at the National Ignition Facility opens new opportunities for foundational studies in opacity, radiation transport, and high-flux astrophysics in regimes previously unattainable. We have succeeded in the critical enabling step of demonstrating ignition in a hohlraum modified …

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Compositional Development and Characterization of Mixed Glass Former Oxy-Sulfide Materials for an Electrochemically Stable Glassy Solid Electrolyte

Alec Wakefield, Madison E. Martin, Noah Riley, Steve W. Martin

Glassy solid electrolytes (GSE) for all-solid-state sodium-ion batteries have the potential to combine the low cost of sodium, the improved energy density and safety of solid-state batteries, and the excellent processability of glass in one system. The 0.54 Na2S + 0.33 SiS2 …

Radiation transfer in the spectra of short-pulse laser-heated targets

Richard A. London, Howard A. Scott, Madison E. Martin

The conditions in laser-produced plasmas are frequently determined with x-ray spectroscopy by comparing calculated to measured spectra. Line spectra from K-shell transitions of low- to mid-atomic number elements are most often used since the important physical processes are well understood and reliable …

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An improved methodology for modeling short pulse buried layer x-ray emission spectra

Dylan Cliche, Madison E. Martin, Richard A. London, Howard A. Scott et autres

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Electrochemical Characterization of a Drawn Thin-Film Glassy Mixed Oxy-Sulfide-Nitride Phosphate Electrolyte for Applications in Solid-State Batteries

Madison E. Martin, Mary Okkema, Steve M. Martin

Thin-film glassy solid-state electrolytes (GSEs) are being considered for applications in energy storage devices; fully-dense thin-film glassy electrolyte materials are able to minimize power loss while suppressing dendrite growth. The glass with the composition Na4P2S5.8O0.92N0.18 (NaPSON) was chosen because it balances the …

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Electrochemical Characterization of a Drawn Thin-Film Glassy Mixed Oxy-Sulfide-Nitride Phosphate Electrolyte Material for Applications in Solid-State Batteries

Mary Okkema, Madison E. Martin, Steve W. Martin

Thin-film glassy solid-state electrolytes are often considered for applications in energy storage devices; fully-dense thin-film glassy electrolyte materials are able to minimize power loss while suppressing dendrite growth. The glass with the composition Na4P2S5.8O0.92N0.18 (NaPSON) was chosen because it balances the high …

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How transient effects can change the inferred plasma temperatures when using K-shell sulfur line ratios in a time dependent iron sulfide plasma

Francisco Rilloraza, Madison E. Martin, Richard A. London, Joseph Nilsen

This paper describes how the steady state atomic kinetics approximation can underestimate the electron temperature determined from K-shell lines in ps-time-scale transient plasmas. In particular, we model the temperature determination of solid FeS targets used in opacity experiments at the Orion laser …

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Quantifying electron temperature distributions from time-integrated x-ray emission spectra

M. J. MacDonald, D. A. Liedahl, Gregory V. Brown, Daniel Åberg et autres

K-shell x-ray emission spectroscopy is a standard tool used to diagnose the plasma conditions created in high-energy-density physics experiments. In the simplest approach, the emissivity-weighted average temperature of the plasma can be extracted by fitting an emission spectrum to a single temperature …

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Two-dimensional parametric design of short pulse laser driven iron opacity experiments

Richard A. London, Roberto A. Colón Quiñones, Madison E. Martin, Heather D. Whitley

High intensity short pulse lasers are commonly used to create high temperature and high density plasmas. These plasmas are used to study fundamental properties such as the equation of state and opacity. The targets often use small-diameter, thin buried layers of the …

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The data-driven future of high-energy-density physics

Peter Hatfield, Jim Gaffney, Gemma J. Anderson, S. J. Ali et autres

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Comparison of ablators for the polar direct drive exploding pusher platform

Heather D. Whitley, Gregory E. Kemp, C. B. Yeamans, Zachary B. Walters et autres

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