A5013585550- Plasma Diagnostics and Applications
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Solar and Space Plasma Dynamics
- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Astrophysics and Star Formation Studies
- Particle accelerators and beam dynamics
- Spectroscopy and Laser Applications
- Atmospheric and Environmental Gas Dynamics
- Dust and Plasma Wave Phenomena
- Electrohydrodynamics and Fluid Dynamics
- Gas Dynamics and Kinetic Theory
- Fluid Dynamics and Heat Transfer
- High-pressure geophysics and materials
- Atomic and Molecular Physics
- Plasma Applications and Diagnostics
- Laser Design and Applications
- Planetary Science and Exploration
- Superconducting Materials and Applications
- Particle Dynamics in Fluid Flows
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
University of Michigan
2017-2025
Los Alamos National Laboratory
2023-2025
Government of the United States of America
2024
West Virginia University
2013-2014
When stellar radiation interacts with a molecular cloud, the cloud's fate depends on strength of incident and radiation's mean-free-path within cloud [F. Bertoldi, Astrophys. J. 346, 735–755 (1989)]. Under right conditions, compresses star formation may occur. Where when occurs in collapse are open questions. Direct observation complete star–cloud lifecycle is nearly impossible due to immense timescales distances over which interaction occurs. Laboratory astrophysics offers way investigate...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation J. Carr, P. A. Cassak, M. Galante, Keesee, G. Lusk, R. Magee, D. McCarren, E. Scime, S. Sears, Vandervort, N. Gulbrandsen, Martin Goldman, David Newman, Eastwood; Spontaneous ion beam formation in the laboratory, space, simulation. Phys. Plasmas 1 July 2013; 20 (7): 072118. https://doi.org/10.1063/1.4817263...
Indirectly driven shock-tube experiments were performed on the Omega Laser Facility to evaluate relative importance of hohlraum x ray and radiative shock preheat sources a low-density foam. X rays emitted from subsequent wave are channeled into foam sample, which contains plastic preheat-witness disk placed downstream Simultaneous radiographic measurements speed in expansion rate witness due allow for observation effects hohlraum's low-energy high-energy x-ray spectrum. We showed,...
Laser Induced Fluorescence (LIF) provides measurements of flow speed, temperature, and density ions or neutrals in a plasma. Traditionally, LIF measurement requires two ports on plasma device; one for laser injection emission collection. Proper alignment optics is time consuming sensitive to mechanical vibration. We describe confocal configuration that single port no alignment. The location scanned radially by physically moving the entire optical structure. Confocal are compared traditional...
We present time-resolved measurements that demonstrate large amplitude electrostatic instabilities appear in pulsed, expanding helicon plasmas at the same time as particularly strong double layers expansion region. A significant cross-correlation between fluctuations and number of ions accelerated by layer electric field is observed. No correlation observed have not passed through layer. These confirm simultaneous appearance simple coincidence. In fact, ion population responsible for growth...
The introduction of a high-precision, 3D-printing method, known as two-photon polymerization (2PP), has created new means producing novel targets to study inertial confinement fusion (ICF). This work aims explore if 2PP fabricated capsules can meet ICF requirements such size, uniformity, deuteration degree, and ability maintain gas fill. Two types with 3D-printed lattices were evaluated on the Omega-60 Laser Facility: (1) carbon-deuterium-oxygen (CDO) lattice H2 fill (2)...
Mixing of materials in porous media can cause a significant impact on fusion yield as previously demonstrated by the National Ignition Facility (NIF) MARBLE Campaign. Initially, reactants are separated, with deuterium lattice struts and tritium gas fill voids. Lattice parameters such strut thickness relative pitch, provide control for mix experiment. Los Alamos Laboratory's (LANL) BOSQUE project looks to better understand how shell burn resultant various laser platforms. xRAGE's Eulerian...
This paper examines the experimental requirements to observe two shock fronts driven by a single x-ray source in systems with sharp absorption edge. We consider where peak of radiation drive coincides K-edge carbon, which occurs at photon energy 284 eV, causing photons be deposited regions. The low-energy (E < eV) penetrate further and main shock, while higher-energy > are absorbed ablated plasma. These create an ionization front, then produces second termed edge-shock. Using...
Backlit-pinhole radiography uses a pinhole placed between an x-ray source and sample. The backlit-multi-pinhole design two pinholes on the same substrate, which are separated by wall, to create radiographic images projected along similar axes. 100-μm thick titanium foil, prevents x-rays generated near one from exiting other pinhole. First results indicate that multi-pinhole target can independent radiographs recorded 2 ns apart. Details of our first discussed.
Summary form only given. In this work we compare measurements of argon ion velocity distribution functions (IVDFs) in a helicon plasma using two spectroscopic techniques: laser induced florescence (LIF) and continuous wave cavity ring down spectroscopy (CW-CRDS). LIF is an established powerful technique, but suffers from the requirement that initial state sequence have substantial density. This usually limits to ions atoms with large metastable densities for given conditions. CRDS proven,...
Damping of Alfvén waves is one the most likely mechanisms for ion heating in solar corona. Ion-neutral collisions have significant but poorly-understood effects on energy transfer and wave propagation partially ionized plasmas, such as those found chromosphere. are thought to play a major role formation auroral arcs well generation parallel electric fields Earth's ionosphere. The high densities created helicon plasmas make them ideal investigating damping waves, which very long wavelengths...