Nathan W. Moore
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View article: Thermo-optic and photoelastic effects on fiber optic interferometry during pulsed plasma radiation
Thermo-optic and photoelastic effects on fiber optic interferometry during pulsed plasma radiation Open
Radiation-induced refractive index change in fiber optic materials presents challenges for photonic Doppler velocimetry and other high-resolution interferometric techniques at fusion research facilities such as the Z Machine (Sandia Nation…
View article: Hydrodynamic expansion and near-infrared absorption of x-ray heated aluminum plasmas
Hydrodynamic expansion and near-infrared absorption of x-ray heated aluminum plasmas Open
We use x-ray pulses from dense argon plasmas at the Z Machine (Sandia National Laboratories) to generate hypersonic aluminum plasmas akin to material ejecta during proposed planetary defense missions, fusion reactor wall excursions, and ot…
View article: Shock-induced chemistry and high strain-rate viscoelastic behavior of a phenolic polymer
Shock-induced chemistry and high strain-rate viscoelastic behavior of a phenolic polymer Open
We use impact experiments and a finite element model (up to 1.2 GPa), and molecular dynamics simulations (up to 60 GPa), to examine the behavior of a phenolic polymer under shock compression, spanning both nonreactive and reactive regimes.…
View article: Pressure-induced transformation of Nb2O5 under shock compression from first principles
Pressure-induced transformation of Nb2O5 under shock compression from first principles Open
Ab initio molecular dynamics (AIMD) simulations were carried out to investigate the equation of state of Nb2O5 and its pressure-density relationship under shock conditions. Here, the focus of this study is on the monoclinic B-Nb2O5 (C2/c) …
View article: Shock state distributions in porous tantalum and characterization with multipoint velocimetry
Shock state distributions in porous tantalum and characterization with multipoint velocimetry Open
Heterogenous materials under shock compression can be expected to reach different shock states throughout the material according to local differences in microstructure and the history of wave propagation. Here, a compact, multiple-beam foc…
View article: Automated segmentation of porous thermal spray material CT scans with predictive uncertainty estimation
Automated segmentation of porous thermal spray material CT scans with predictive uncertainty estimation Open
Thermal sprayed metal coatings are used in many industrial applications, and characterizing the structure and performance of these materials is vital to understanding their behavior in the field. X-ray computed tomography (CT) enables volu…
View article: Radiation, optical, power flow, and electrical diagnostics at the Z facility: Layout and techniques utilized to operate in the harsh environment
Radiation, optical, power flow, and electrical diagnostics at the Z facility: Layout and techniques utilized to operate in the harsh environment Open
The Z machine is a current driver producing up to 30 MA in 100 ns that utilizes a wide range of diagnostics to assess accelerator performance and target behavior conduct experiments that use the Z target as a source of radiation or high pr…
View article: ThermalNetwork [SWR-23-101]
ThermalNetwork [SWR-23-101] Open
ThermalNetwork is software to size distributed ground heat exchangers for district-connected ground-source heat pump systems. The intended audience includes Ground Source Heat Pump Designers.
View article: Validation of ablation model for polyethylene using pulsed x-ray and proton exposures
Validation of ablation model for polyethylene using pulsed x-ray and proton exposures Open
The surface erosion of polyethylene is interrogated using pulsed x rays at the Z Machine (Sandia National Laboratories) and with proton beams at the Gamble II generator (Naval Research Laboratory) to validate a coupled model for volumetric…
View article: Effects and mitigation of pulsed power radiation on optical fiber velocimetry
Effects and mitigation of pulsed power radiation on optical fiber velocimetry Open
Optical fiber diagnostics are extensively used in pulsed power experiments, such as the Sandia Z machine. However, radiation produced in a pulsed power environment can significantly affect these measurements. Catastrophic fiber darkening m…
View article: Predictive Radiation Oncology – A New NCI–DOE Scientific Space and Community
Predictive Radiation Oncology – A New NCI–DOE Scientific Space and Community Open
With a widely attended virtual kickoff event on January 29, 2021, the National Cancer Institute (NCI) and the Department of Energy (DOE) launched a series of 4 interactive, interdisciplinary workshops-and a final concluding "World Café" on…
View article: Modeling district heating and cooling systems with URBANopt, GeoJSON to Modelica Translator, and the Modelica Buildings Library
Modeling district heating and cooling systems with URBANopt, GeoJSON to Modelica Translator, and the Modelica Buildings Library Open
The URBANopt project has successfully leveraged OpenStudio/EnergyPlus to model buildings and electrical systems at an urban scale; however, URBANopt has lacked the ability to model district thermal energy systems until recently. This paper…
View article: Sample test array and recovery (STAR) platform at the National Ignition Facility
Sample test array and recovery (STAR) platform at the National Ignition Facility Open
We have developed the Sample Test Array and Recovery (STAR) platform for the National Ignition Facility (NIF) for studying the thermal and hydrodynamic responses of materials in extreme environments. The STAR platform expands the range of …
View article: Fast three-dimensional rules-based simulation of thermal-sprayed microstructures
Fast three-dimensional rules-based simulation of thermal-sprayed microstructures Open
Thermal spray processes involve the repeated impact of millions of discrete particles, whose melting, deformation, and coating-formation dynamics occur at microsecond timescales. The accumulated coating that evolves over minutes is compris…
View article: Shock Hugoniot and High Strain-Rate Viscoelastic Behavior of a Phenolic Polymer.
Shock Hugoniot and High Strain-Rate Viscoelastic Behavior of a Phenolic Polymer. Open
two impact events are essentially identical except that the projectile masses and crater volumes differ by nearly 12 orders of magnitude -- linear dimensions and times differing by 4 orders of magnitude. Strain rates at corresponding point…