Patrick Poole
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View article: Thermal energy transport in laser-driven high x-ray conversion efficiency metallic silver nanowire foams
Thermal energy transport in laser-driven high x-ray conversion efficiency metallic silver nanowire foams Open
We report on record brightness from Ag x-ray emission obtained using a novel laser-produced plasma source. The reported K-shell conversion efficiency of nearly 1% with a radiant energy of ≈0.6 kJ/sr from Ag ions is the highest presently re…
View article: Effect of self-generated magnetic fields on x-ray emission in Kr-filled targets at the National Ignition Facility
Effect of self-generated magnetic fields on x-ray emission in Kr-filled targets at the National Ignition Facility Open
We examine the effects of self-generated magnetic fields in a Kr gas pipe x-ray source platform. X-ray emission from Kr plasma is dependent on the plasma conditions, as the ionization state is largely a function of temperature. Magnetic fi…
View article: High Energy Back-lighting Coupled with an Offset and Shielded Collecting Optic
High Energy Back-lighting Coupled with an Offset and Shielded Collecting Optic Open
View article: X-ray source characterization and sample heating on x-ray diffraction experiments at the National Ignition Facility
X-ray source characterization and sample heating on x-ray diffraction experiments at the National Ignition Facility Open
X-ray diffraction is a powerful measurement technique for determining material properties, and it is now possible to perform these experiments at pressures exceeding 1 TPa [Rygg et al., Rev. Sci. Instrum. 91, 043902 (2020)] at the National…
View article: Production of high fluence laser beams using ion wave plasma optics
Production of high fluence laser beams using ion wave plasma optics Open
Optical components for laser beams with high peak and averaged powers are being developed worldwide using stimulated plasma scattering that occurs when plasmas interact with intense, coherent light. After decades of pursuit of pulse compre…
View article: ENABLING IGNITION STUDIES AND ADVANCED POWER PLANTS BY DEVELOPMENT OF ULTRA HIGH FLUENCE BEAMS PRODUCED BY PLASMA OPTICS
ENABLING IGNITION STUDIES AND ADVANCED POWER PLANTS BY DEVELOPMENT OF ULTRA HIGH FLUENCE BEAMS PRODUCED BY PLASMA OPTICS Open
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: FY20 LLNL Experimental Programs at Omega
FY20 LLNL Experimental Programs at Omega Open
In Fiscal Year 2020 (FY20), Lawrence Livermore National Laboratory’s (LLNL’s) High-Energy-Density Physics (HED) and Indirect Drive Inertial Confinement Fusion (ICF-ID) programs conducted numerous campaigns on the OMEGA and OMEGA-EP (EP) la…
View article: FY19 LLNL Experimental Programs at Omega
FY19 LLNL Experimental Programs at Omega Open
In Fiscal Year 2019 (FY19), Lawrence Livermore National Laboratory’s (LLNL’s) High- Energy-Density Physics (HED) and Indirect Drive Inertial Confinement Fusion (ICF-ID) programs conducted numerous campaigns on the OMEGA and OMEGA-EP (EP) l…
View article: COUPLED RADIATION HYDRODYNAMIC SIMULATION OF MELTING AND SHOCK FROM PULSED WARM X-RAY RADIATION AT THE NATIONAL IGNITION FACILITY.
COUPLED RADIATION HYDRODYNAMIC SIMULATION OF MELTING AND SHOCK FROM PULSED WARM X-RAY RADIATION AT THE NATIONAL IGNITION FACILITY. Open
View article: Modeling pulse-cleaning plasma mirrors from dielectric response to saturation: A particle-in-cell approach
Modeling pulse-cleaning plasma mirrors from dielectric response to saturation: A particle-in-cell approach Open
Pulse-cleaning plasma mirrors are widely employed to improve ultraintense laser contrast, but much of the literature concerning their effect on the reflected pulse is empirical. A simulation study of pulse-cleaning plasma mirrors using the…
View article: Development Considerations for High-Repetition-Rate HEDP Experiments
Development Considerations for High-Repetition-Rate HEDP Experiments Open
This paper discusses experimental techniques and considerations associated with the transition to high repetition-rate experiments in High Energy Density Physics (HEDP). We particularly highlight approaches to experimentation that become p…
View article: Investigation of high X-ray conversion efficiency Kr filled gas sources at the National Ignition Facility
Investigation of high X-ray conversion efficiency Kr filled gas sources at the National Ignition Facility Open
We report on the performance of high x-ray fluence Kr K-shell sources that are being developed for high energy density experiments. These targets are 4.1 mm in diameter 4.4 mm tall hollow epoxy tubes having a 40 μm thick wall holding 1.5 a…
View article: Relativistic laser driven electron accelerator using micro-channel plasma targets
Relativistic laser driven electron accelerator using micro-channel plasma targets Open
We present an experimental demonstration of the efficient acceleration of electrons beyond 60 MeV using micro-channel plasma targets. We employed a high-contrast, 2.5 J, 32 fs short pulse laser interacting with a 5 μm inner diameter, 300 μ…
View article: FY18 LLNL Experimental Programs at Omega
FY18 LLNL Experimental Programs at Omega Open
In Fiscal Year 2018 (FY18), Lawrence Livermore National Laboratory’s (LLNL’s) High Energy-Density Physics (HED) and Indirect Drive Inertial Confinement Fusion (ICF-ID) programs conducted numerous campaigns on the OMEGA and OMEGA-EP (EP) la…
View article: Anomalous material-dependent transport of focused, laser-driven proton beams
Anomalous material-dependent transport of focused, laser-driven proton beams Open
View article: A plasma amplifier to combine multiple beams at NIF
A plasma amplifier to combine multiple beams at NIF Open
Combining laser beams in a plasma is enabled by seeded stimulated Brillouin scattering which allows cross-beam energy transfer (CBET) to occur and re-distributes the energy between beams that cross with different incident angles and small …
View article: Development of high intensity X-ray sources at the National Ignition Facility
Development of high intensity X-ray sources at the National Ignition Facility Open
Laser heated plasmas have provided recently some of the most powerful and energetic nanosecond length laboratory sources of x-ray photons (Ephoton = 1–30 keV). The highest x-ray to laser conversion is currently accessible by using underden…
View article: Laser-driven ion acceleration via target normal sheath acceleration in the relativistic transparency regime
Laser-driven ion acceleration via target normal sheath acceleration in the relativistic transparency regime Open
Here we present an experimental study investigating laser-driven proton acceleration via target normal sheath acceleration (TNSA) over a target thickness range spanning the typical TNSA-dominant regime (~1 μm) down to below the onset of re…
View article: FY17 LLNL Omega Experimental Programs
FY17 LLNL Omega Experimental Programs Open
The Capseed campaign goal is to measure shock front velocity non-uniformities in Inertial Confinement Fusion (ICF) ablator materials and quantify the level of non-uniformity caused by intrinsic effects. This is done using the Omega High Re…
View article: Study of accelerated ion energy and spatial distribution with variable thickness liquid crystal targets
Study of accelerated ion energy and spatial distribution with variable thickness liquid crystal targets Open
We report on laser-based ion acceleration using freely suspended liquid crystal film targets, formed with thicknesses varying from 100 $nm$ to 2 $μm$ for this experiment. Optimization of Target Normal Sheath Acceleration (TNSA) of protons …
View article: Moderate repetition rate ultra-intense laser targets and optics using variable thickness liquid crystal films
Moderate repetition rate ultra-intense laser targets and optics using variable thickness liquid crystal films Open
Liquid crystal films are variable thickness, planar targets for ultra-intense laser matter experiments such as ion acceleration. Their target qualities also make them ideal for high-power laser optics such as plasma mirrors and waveplates.…
View article: Experiment and simulation of novel liquid crystal plasma mirrors for high contrast, intense laser pulses
Experiment and simulation of novel liquid crystal plasma mirrors for high contrast, intense laser pulses Open
View article: Experimental capabilities of 04 PW, 1 shot/min Scarlet laser facility for high energy density science
Experimental capabilities of 04 PW, 1 shot/min Scarlet laser facility for high energy density science Open
We report on the recently completed 400 TW upgrade to the Scarlet laser at The Ohio State University. Scarlet is a Ti:sapphire-based ultrashort pulse system that delivers >10 J in 30 fs pulses to a 2 μm full width at half-maximum focal spo…
View article: Microengineering Laser Plasma Interactions at Relativistic Intensities
Microengineering Laser Plasma Interactions at Relativistic Intensities Open
We report on the first successful proof-of-principle experiment to manipulate laser-matter interactions on microscales using highly ordered Si microwire arrays. The interaction of a high-contrast short-pulse laser with a flat target via pe…
View article: In-situ, variable thickness, liquid crystal film target inserter for moderate repetition rate intense laser applications
In-situ, variable thickness, liquid crystal film target inserter for moderate repetition rate intense laser applications Open
Liquid crystal films have recently been demonstrated as variable thickness, planar targets for ultra-intense laser matter experiments and applications such as ion acceleration. By controlling the parameters of film formation, including liq…
View article: In-situ, variable thickness, liquid crystal film target formation at moderate repetition rate for intense laser applications
In-situ, variable thickness, liquid crystal film target formation at moderate repetition rate for intense laser applications Open
View article: A confocal microscope position sensor for micron-scale target alignment in ultra-intense laser-matter experiments
A confocal microscope position sensor for micron-scale target alignment in ultra-intense laser-matter experiments Open
A diagnostic tool for precise alignment of targets in laser-matter interactions based on confocal microscopy is presented. This device permits precision alignment of targets within the Rayleigh range of tight focusing geometries for a wide…
View article: A New Cutting-Edge Liquid Target for High-Intensity Laser Systems
A New Cutting-Edge Liquid Target for High-Intensity Laser Systems Open
One of the most exciting aspects of high-intensity short-pulse lasers is their ability to produce beams of energetic protons and neutrons. These intense laser-produced beams may have direct applications in proton cancer therapy and neutron…
View article: Erratum: “Liquid crystal films as on-demand, variable thickness (50–5000 nm) targets for intense lasers” [Phys. Plasmas <b>21</b>, 063109 (2014)]
Erratum: “Liquid crystal films as on-demand, variable thickness (50–5000 nm) targets for intense lasers” [Phys. Plasmas <b>21</b>, 063109 (2014)] Open
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