Explanipedia

A Comparison of the Definition of a Life Care Plan: The Impact on Life Care Planners Open

Cloie B. Johnson, John R. Cary, E Hebner Robert · 2025

Exploration of established and emerging definitions for the terms life care plan and life care planning was completed with the goal of factually and historically identifying differing and common conclusions amongst the definitions. Termino…

Labor Market Survey/Research: An Approach Centered on the Individual and Grounded in Objective and Reliable Data Open

John R. Cary, Jamie N. Gamez, Nicholas J. Choppa · 2025

In 2010, a cross section of Vocational Rehabilitation Counselors (VRC’s) in Washington State took part in a comprehensive review oflabor market survey methodology as it pertains to Washington Administrative Codes (WAC) (Donley & Johnson, 2…

Considerations for Vocational Assessments in the Era of COVID-19 Open

John R. Cary, Nick Choppa, Catie Johnson, Kourtney Layton, Don Taylor , et al. · 2025

The year 2020 was unprecedented for many reasons. Few events during the past century have been mm·e novel and far-reaching than the emergence and rapid spread of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), the virus that …

Grid instability growth rates for explicit, electrostatic momentum- and energy-conserving particle-in-cell algorithms Open

Luke C. Adams, G. Werner, John R. Cary · 2025

When the Debye length is not resolved in a simulation using the most common particle-in-cell (PIC) algorithm, the plasma will unphysically heat until the Debye length becomes resolved via a phenomenon known as grid heating. This paper pres…

Nonlocal effects on thermal transport in hydrodynamic simulations of unmagnetized MagLIF-relevant gaspipes on NIF Open

Ryan Lau, D. J. Strozzi, M. Sherlock, Matthew Weis, Archis Joglekar , et al. · 2025

We present simulations of heat flow relevant to gaspipe experiments on the National Ignition Facility to investigate kinetic effects on transport phenomena. D2 and neopentane (C5H12) filled targets are used to study the laser preheat stage…

Modeling the Role of Secondary Electron Emission in Direct Current Magnetron Sputtering using Explicit Energy-Conserving Particle-in-Cell Methods Open

Daniel Main, Thomas G. Jenkins, Joseph G. Theis, G. Werner, John R. Cary , et al. · 2025

We present results from a fully kinetic particle-in-cell (PIC) simulation of direct current magnetron sputtering (dcMS) in a 2D cylindrically symmetric geometry. The particle-in-cell model assumes an electrostatic approximation and include…

Nonlocal Thermal Transport Effects on Laser Propagation in MagLIF-Relevant Gaspipes on NIF Open

Ryan Lau, D J Strozzi, Archis Joglekar, M. Sherlock, W. A. Farmer , et al. · 2025

Nonlocal effects on Thermal Transport in MagLIF-Relevant Gaspipes on NIF Open

Ryan Lau, D. J. Strozzi, M. Sherlock, Archis Joglekar, W. A. Farmer , et al. · 2025

We present simulations of heat flow relevant to gaspipe experiments on the National Ignition Facility (NIF) to investigate kinetic effects on transport phenomena. D2 and neopentane (C5H12) filled targets are used to study the laser preheat…

Empirically extending 1D Child–Langmuir theory to a finite temperature beam Open

Jesse M. Snelling, G. Werner, John R. Cary · 2024

Numerical solutions to the 1D steady-state Vlasov–Poisson system are used to develop a straightforward empirical formula for the electric current density transmitted through a vacuum diode (voltage gap) as a function of gap distance, gap v…

Temporal evolution of the light emitted by a thin, laser-ionized plasma source Open

Valentina Lee, Robert Ariniello, Christopher Doss, Kathryn Wolfinger, Peter Stoltz , et al. · 2024

We present an experimental and simulation-based investigation of the temporal evolution of light emission from a thin, laser-ionized helium plasma source. We demonstrate an analytic model to calculate the approximate scaling of the time-in…

Plasma Photocathodes Open

A. F. Habib, T. Heinemann, G. G. Manahan, D. Ullmann, Paul Scherkl , et al. · 2023

Plasma wakefield accelerators offer accelerating and focusing electric fields three to four orders of magnitude larger than state‐of‐the‐art radiofrequency cavity‐based accelerators. Plasma photocathodes can release ultracold electron popu…

Temporal Evolution of the Light Emitted by a Thin, Laser-ionized Plasma Source Open

Valentina Lee, Robert Ariniello, Christopher Doss, Kathryn Wolfinger, Peter Stoltz , et al. · 2023

We present an experimental and simulation-based investigation of the temporal evolution of light emission from a thin, laser-ionized Helium plasma source. We demonstrate an analytic model to calculate the approximate scaling of the time-in…

Basic Research Needs in The Science of Scientific Software Development and Use: Investment in Software is Investment in Science Open

Michael A. Heroux, David E. Bernholdt, Lois Curfman McInnes, John R. Cary, Daniel S. Katz , et al. · 2023

Increasingly powerful and affordable computing has revolutionized scientific and scholarly discovery across a broad range of fields. Computing relies on software, which has been rapidly growing in scope, diversity, and complexity. At the s…

Underdense plasma lens with a transverse density gradient Open

Christopher Doss, Robert Ariniello, John R. Cary, S. Corde, Henrik Ekerfelt , et al. · 2023

We explore the implications of a transverse density gradient on the performance of an underdense plasma lens and nonlinear plasma-based accelerator. Transverse density gradients are unavoidable in plasma sources formed in the outflow of st…

Attosecond-Angstrom free-electron-laser towards the cold beam limit Open

A. F. Habib, G. G. Manahan, Paul Scherkl, T. Heinemann, A. Sutherland , et al. · 2023

Attosecond-Angstrom free-electron-laser towards the cold beam limit Open

A. F. Habib, G. G. Manahan, Paul Scherkl, T. Heinemann, A. Sutherland , et al. · 2022

Electron beam quality is paramount for X-ray pulse production in free-electron-lasers (FELs). State-of-the-art linear accelerators (linacs) can deliver multi-GeV electron beams with sufficient quality for hard X-ray-FELs, albeit requiring …

Chromatic transverse dynamics in a nonlinear plasma accelerator Open

Robert Ariniello, Christopher Doss, Valentina Lee, Claire Hansel, John R. Cary , et al. · 2022

We present a theoretical investigation of the chromatic dynamics of the witness beam within a plasma based accelerator. Our approach allows us to include the impact the longitudinal dynamics have on the transverse dynamics. We start …

The Science of Scientific Software Development and Use Open

Michael A. Heroux, David E. Bernholdt, Lois Curfman McInnes, John R. Cary, Daniel S. Katz , et al. · 2022

Increasingly powerful and affordable computing has revolutionized scientific and scholarly discovery across a broad range of fields. Computing relies on software, which has been rapidly growing in scope, diversity, and complexity. At the s…

Plasma photonic spatiotemporal synchronization of relativistic electron and laser beams Open

Paul Scherkl, A. Knetsch, T. Heinemann, A. Sutherland, A. F. Habib , et al. · 2022

Modern particle accelerators and their applications increasingly rely on precisely coordinated interactions of intense charged particle and laser beams. Femtosecond-scale synchronization alongside micrometre-scale spatial precision are ess…

Highly Accurate Frequency Calculations of Crab Cavities Using the VORPAL Computational Framework Open

Travis Austin, John R. Cary, L. Bellantoni · 2022

We have applied the Werner-Cary method [J. Comp. Phys. 227, 5200-5214 (2008)] for extracting modes and mode frequencies from time-domain simulations of crab cavities, as are needed for the ILC and the beam delivery system of the LHC. This …

Computational Accelerator Physics Working Group Summary Open

John R. Cary, Courtlandt L. Bohn · 2022

The working group on computational accelerator physics at the 11th Advanced Accelerator Concepts Workshop held a series of meetings during the Workshop. Verification, i.e., showing that a computational application correctly solves the assu…

Accelerated steady-state electrostatic particle-in-cell simulation of Langmuir probes Open

G. Werner, Scott Robertson, Thomas G. Jenkins, Andrew M. Chap, John R. Cary · 2022

First-principles particle-in-cell (PIC) simulation is a powerful tool for understanding plasma behavior, but this power often comes at great computational expense. Artificially reducing the ion/electron mass ratio is a time-honored practic…

All-optical density downramp injection in electron-driven plasma wakefield accelerators Open

D. Ullmann, Paul Scherkl, A. Knetsch, T. Heinemann, A. Sutherland , et al. · 2021

The properties of electron beams obtainable from plasma wakefield accelerators are largely determined by their injection into the plasma wave. Density downramps can facilitate injection of plasma electrons and are realized routinely in las…

Position Papers for the ASCR Workshop on the Science of Scientific-Software Development and Use Open

David E. Bernholdt, John R. Cary, Michael A. Heroux, Lois Curfman McInnes · 2021

Software is an increasingly important component in the pursuit of scientific discovery. Both its development and use are essential activities for many scientific teams. At the same time, very little scientific study has been conducted to u…

Terahertz Radiation from Laser-Ionized Plasmas Open

Kathryn Wolfinger, G. Werner, John R. Cary · 2021

Numerical simulations of laser-plasma interactions demonstrate the generation of axially polarized electromagnetic pulses (EMPs) that radiate away energy with a characteristic frequency determined by the plasma frequency, in the THz range …

Chromatic Dynamics of an Electron Beam in a Plasma Based Accelerator Open

Robert Ariniello, Christopher Doss, Victor Chang Lee, Claire Hansel, John R. Cary , et al. · 2021

We present a theoretical investigation of the chromatic dynamics of the witness beam within a plasma based accelerator. We derive the single particle motion of an electron in an ion column within a nonlinear, blowout wake including adiabat…

Ultrahigh brightness beams from plasma photoguns Open

A. F. Habib, T. Heinemann, G. G. Manahan, Leslie Rutherford, D. Ullmann , et al. · 2021

Plasma photocathodes open a path towards tunable production of well-defined, compact electron beams with normalized emittance and brightness many orders of magnitude better than state-of-the-art. Such beams could have a far-reaching impact…

Computing the Paschen curve for argon with speed-limited particle-in-cell simulation Open

Joseph G. Theis, G. Werner, Thomas G. Jenkins, John R. Cary · 2021

Upon inclusion of collisions, the speed-limited particle-in-cell (SLPIC) simulation method successfully computed the Paschen curve for argon. The 1D3V simulations modeled an electron cascade across an argon-filled capacitor, including elec…

Extremely Dense Gamma-Ray Pulses in Electron Beam-Multifoil Collisions Open

Archana Sampath, X. Davoine, S. Corde, Laurent Gremillet, M. Gilljohann , et al. · 2021

Sources of high-energy photons have important applications in almost all areas of research. However, the photon flux and intensity of existing sources is strongly limited for photon energies above a few hundred keV. Here we show that a hig…

Electromagnetic Simulations of a Novel Proton Linac Using VSim on HPC Open

Salvador Sosa Güitrón, S.G. Biedroń, Trudy Bolin, John R. Cary, Mark S. Curtin , et al. · 2021

We discuss electromagnetic simulations of accelerating structures in a high performance computing (HPC) system. Our overarching goal is to resolve the linac operation in a large ensemble of initial beam conditions. This requires a symbioti…

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