129 citations · 465 across the 25 of their papers we have counts for
26 papers
Applying Machine Learning Methods to Laser Acceleration of Protons: Lessons Learned from Synthetic Data
Ronak Desai, Thomas Zhang, Ricky Oropeza +6
Researchers in the field of ultra-intense laser science are beginning to embrace machine learning methods. In this study we consider three different machine learning methods -- a t…
Methods to Simplify Object Tracking in Video Data
Chris Orban, Scott Zimmerman, Jessica T. Kulp +4
Recent years have seen an explosion of interest in analyzing the motion of objects in video data as a way for students to connect the concepts of physics to something tangible like…
A Particle-In-Cell Code Comparison for Ion Acceleration: EPOCH, LSP, and WarpX
Joseph R. Smith, Chris Orban, Nashad Rahman +3
There are now more Particle-in-Cell (PIC) codes than ever before that researchers use to simulate intense laser-plasma interactions. To date, there have been relatively few direct…
Particle-in-Cell modeling of a potential demonstration experiment for double pulse enhanced target normal sheath acceleration
Nashad Rahman, Joseph R. Smith, Gregory Ngirmang +1
Ultra intense lasers are a promising source of energetic ions for various applications. An interesting approach described in Ferri et al. 2019 argues from Particle-in-Cell simulati…
Code-to-Code Comparison and Validation of the Radiation-Hydrodynamics Capabilities of the FLASH Code Using a Laboratory Astrophysical Jet
Chris Orban, Milad Fatenejad, Don Q. Lamb
The potential for laser-produced plasmas to yield fundamental insights into high energy density physics (HEDP) and deliver other useful applications can sometimes be frustrated by…
Optimizing Laser-Plasma Interactions for Ion Acceleration using Particle-in-Cell Simulations and Evolutionary Algorithms
Joseph R. Smith, Chris Orban, John T. Morrison +4
The development of ultra-intense laser-based sources of high energy ions is an important goal, with a variety of potential applications. One of the barriers to achieving this goal…
Using Virtual Reality in Electrostatics Instruction: The Impact of Training
Chris D. Porter, Joseph R. H. Smith, Eric M. Stagar +5
Recent years have seen a resurgence of interest in using Virtual Reality (VR) technology to benefit instruction, especially in physics and related subjects. As VR devices improve a…
Experimental observation and computational modeling of radial Weibel instability in high intensity laser-plasma interactions
Gregory K. Ngirmang, John T. Morrison, Kevin M. George +5
When a relativistic intensity laser interacts with the surface of a solid density target, suprathermal electron currents are subject to Weibel instability filamentation when propag…
Computational Thinking in Introductory Physics
Chris Orban, Richelle Teeling-Smith
Computational Thinking (CT) is still a relatively new term in the lexicon of learning objectives and science standards. There is not yet widespread agreement on the precise definit…
Particle-in-Cell Simulations of Density Peak Formation and Ion Acceleration from Short Pulse Laser-Driven Ponderomotive Steepening
Joseph R. Smith, Chris Orban, Gregory K. Ngirmang +4
We use particle-in-cell (PIC) simulations and simple analytic models to investigate the laser-plasma interaction known as ponderomotive steepening. When normally incident laser lig…
A Hybrid Approach for Using Programming Exercises in Introductory Physics
Chris Orban, Richelle M. Teeling-Smith, Joseph R. H. Smith +1
Incorporating computer programming exercises into introductory physics is a delicate task that involves a number of choices that may have an effect on student learning. We present…
A controlled study of stereoscopic virtual reality in freshman electrostatics
Joseph R. Smith, Amber Byrum, Timothy M. McCormick +3
Virtual reality (VR) has long promised to revolutionize education, but with little follow-through. Part of the reason for this is the prohibitive cost of immersive VR headsets or c…
A novel approach for using programming exercises in electromagnetism coursework
Chris Orban, Chris D. Porter, Nash K. Brecht +2
While there exists a significant number of web interactives for introductory physics, students are almost never shown the computer code that generates these interactives even when…
Particle-in-Cell Simulations of Electron Beam Production from Infrared Ultra-intense Laser Interactions
Gregory K. Ngirmang, Chris Orban, Scott Feister +3
Advances in ultra-intense laser technology are enabling, for the first time, relativistic intensities at mid-infrared (mid-IR) wavelengths. Anticipating further experimental resear…
A Game-Centered, Interactive Approach for Using Programming Exercises in Introductory Physics
Chris Orban, Chris Porter, Joseph R. H. Smith +4
Incorporating computer programming exercises in introductory physics is a delicate task that involves a number of choices that may have a strong affect on student learning. We pres…
3D PIC simulations of electron beams created via reflection of intense laser light from a water target
Gregory K. Ngirmang, Chris Orban, Scott Feister +4
We present 3D Particle-in-Cell (PIC) modeling of an ultra-intense laser experiment by the Extreme Light group at the Air Force Research Laboratory (AFRL) using the PIC code LSP. Th…
Relativistic electron acceleration by mJ-class kHz lasers normally incident on liquid targets
Scott Feister, Drake R. Austin, John T. Morrison +10
We report observation of kHz-pulsed-laser-accelerated electron energies up to 3 MeV in the - (backward) direction from a 3 mJ laser interacting at normal incidence…
Backward-propagating MeV electrons from W/cm laser interactions with water
John T. Morrison, Enam A. Chowdhury, Kyle D. Frische +6
We present an experimental study of the generation of MeV electrons opposite to the direction of laser propagation following the relativistic interaction at normal incidence…
A Novel Femtosecond-Gated, High-Resolution, Frequency-Shifted Shearing Interferometry Technique for Probing Pre-Plasma Expansion in Ultra-Intense Laser Experiments
S. Feister, J. A. Nees, J. T. Morrison +4
Ultra-intense laser-matter interaction experiments (>10 W/cm) with dense targets are highly sensitive to the effect of laser "noise" (in the form of pre-pulses) preced…
Backward-Propagating MeV Electrons in Ultra-Intense Laser Interactions: Standing Wave Acceleration and Coupling to the Reflected Laser Pulse
Chris Orban, John T. Morrison, Enam D. Chowdhury +4
Laser-accelerated electron beams have been created at a kHz repetition rate from the {\it reflection} of intense ( W/cm), 40 fs laser pulses focused on a con…
Cosmological Perturbation Theory as a Tool for Estimating Box-Scale Effects in N-body Simulations
Chris Orban
In performing cosmological N-body simulations, it is widely appreciated that the growth of structure on the largest scales within a simulation box will be inhibited by the finite s…
A Radiation-Hydrodynamics Code Comparison for Laser-Produced Plasmas: FLASH versus HYDRA and the Results of Validation Experiments
Chris Orban, Milad Fatenejad, Sugreev Chawla +2
The potential for laser-produced plasmas to yield fundamental insights into high energy density physics (HEDP) and deliver other useful applications can sometimes be frustrated by…
Keeping It Real: Revisiting a Real-Space Approach to Running Ensembles of Cosmological N-body Simulations
Chris Orban
In setting up initial conditions for ensembles of cosmological N-body simulations there are, fundamentally, two choices: either maximizing the correspondence of the initial density…
Self-Similar Bumps and Wiggles: Isolating the Evolution of the BAO Peak with Power-law Initial Conditions
Chris Orban, David H. Weinberg
Motivated by cosmological surveys that demand accurate theoretical modeling of the baryon acoustic oscillation (BAO) feature in galaxy clustering, we analyze N-body simulations in…