P.M. Nilson
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View article: Parametrized ion-distribution model for extended x-ray absorption fine-structure analysis at high-energy-density conditions
Parametrized ion-distribution model for extended x-ray absorption fine-structure analysis at high-energy-density conditions Open
Experiments today can compress solids near isentropically to pressures approaching 100 × 106 atmospheres; however, determining the temperature of such matter remains a major challenge. Extended x-ray absorption fine-structure (EXAFS) spect…
View article: Non-thermal electron acceleration from magnetically driven reconnection in a laboratory plasma
Non-thermal electron acceleration from magnetically driven reconnection in a laboratory plasma Open
View article: High-resolution x-ray spectrometer for x-ray absorption fine structure spectroscopy
High-resolution x-ray spectrometer for x-ray absorption fine structure spectroscopy Open
Two extended x-ray absorption fine structure flat crystal x-ray spectrometers (EFX’s) were designed and built for high-resolution x-ray spectroscopy over a large energy range with flexible, on-shot energy dispersion calibration capabilitie…
View article: Emission phases of implosion sources for x-ray absorption fine structure spectroscopy
Emission phases of implosion sources for x-ray absorption fine structure spectroscopy Open
At the Laboratory for Laser Energetics' Omega Laser Facility, thin plastic shells were directly driven with ∼20 kJ resulting in a time-integrated x-ray yield of ∼1012 ph/eV/sr at 7 keV. Using temporally, spatially, and spectrally discrimin…
View article: Direct measurement of non-thermal electron acceleration from magnetically driven reconnection in a laboratory plasma
Direct measurement of non-thermal electron acceleration from magnetically driven reconnection in a laboratory plasma Open
Magnetic reconnection is a ubiquitous astrophysical process that rapidly converts magnetic energy into some combination of plasma flow energy, thermal energy, and non-thermal energetic particles, including energetic electrons. Various reco…
View article: Density evolution after shock release from laser-driven polystyrene (CH) targets in inertial confinement fusion
Density evolution after shock release from laser-driven polystyrene (CH) targets in inertial confinement fusion Open
The evolution of the plasma density in the rarefaction wave formed after a laser-driven shock is released from a CH foil was measured using optical interferometry. It was found that the plasma density profile is very sensitive to the condi…
View article: Pulse width dependence of magnetic field generation using laser-powered capacitor coils
Pulse width dependence of magnetic field generation using laser-powered capacitor coils Open
Megagauss magnetic fields were generated by a current flowing through a U-shaped coil connecting two parallel copper foils. Two kJ-class lasers at various pulse widths from 2 ns to 9.9 ns passed through holes in the front foil and were foc…
View article: High-resolution x-ray radiography with Fresnel zone plates on the University of Rochester’s OMEGA Laser Systems
High-resolution x-ray radiography with Fresnel zone plates on the University of Rochester’s OMEGA Laser Systems Open
Experiments performed at the Laboratory for Laser Energetics with a continuous-wave (cw) x-ray source and on the OMEGA and OMEGA EP Laser Systems [Boehly et al., Opt. Commun. 133, 495 (1997) and Waxer et al., Opt. Photonics News 16, 30 (20…
View article: Magnetic Signatures of Radiation-Driven Double Ablation Fronts
Magnetic Signatures of Radiation-Driven Double Ablation Fronts Open
In experiments performed with the OMEGA EP laser system, magnetic field generation in double ablation fronts was observed. Proton radiography measured the strength, spatial profile, and temporal dynamics of self-generated magnetic fields a…
View article: Interspecies radiative transition in warm and superdense plasma mixtures
Interspecies radiative transition in warm and superdense plasma mixtures Open
View article: Parameterizing hot electron energy distributions for tabular emissivities and opacities
Parameterizing hot electron energy distributions for tabular emissivities and opacities Open
View article: Study of a magnetically driven reconnection platform using ultrafast proton radiography
Study of a magnetically driven reconnection platform using ultrafast proton radiography Open
A novel magnetically driven reconnection platform was created by a pair of U-shaped Cu coils that connect two parallel Cu plates irradiated at a focused laser intensity of ∼3 × 1016 W/cm2 and characterized using ultrafast proton radiograph…
View article: Relativistic-electron-driven magnetic reconnection in the laboratory
Relativistic-electron-driven magnetic reconnection in the laboratory Open
Magnetic reconnection is a fundamental process occurring in many plasma systems. Magnetic field lines break and reconfigure in to a lower energy state, converting released magnetic field energy into plasma kinetic energy. Around some of th…
View article: The National Direct-Drive Inertial Confinement Fusion Program
The National Direct-Drive Inertial Confinement Fusion Program Open
The National Direct-Drive Inertial Confinement Fusion Program consists of the 100-Gbar Campaign on the 30-kJ, 351-nm, 60-beam OMEGA Laser System and the Megajoule Direct-Drive (MJDD) Campaign on the 1.8-MJ, 351-nm, 192-beam National Igniti…
View article: Measurements of Picosecond Energy Equilibration in Isochorically Heated Materials
Measurements of Picosecond Energy Equilibration in Isochorically Heated Materials Open
In this Final Report we present the results of our DOE/FES-sponsored research on rapidly heated materials. The research focused on the details of picosecond energy equilibration and material response to isochoric heating by relativistic (o…
View article: Picosecond time-resolved measurements of dense plasma line shifts
Picosecond time-resolved measurements of dense plasma line shifts Open
Picosecond time-resolved x-ray spectroscopy is used to measure the spectral line shift of the 1s2p-1s^{2} transition in He-like Al ions as a function of the instantaneous plasma conditions. The plasma temperature and density are inferred f…
View article: Calibration and characterization of a highly efficient spectrometer in von Hamos geometry for 7-10 keV x-rays
Calibration and characterization of a highly efficient spectrometer in von Hamos geometry for 7-10 keV x-rays Open
We have built an absolutely calibrated, highly efficient, Bragg crystal spectrometer in von Hamos geometry. This zinc von Hamos spectrometer uses a crystal made from highly oriented pyrolytic graphite that is cylindrically bent along the n…
View article: Relativistic intensity laser interactions with low-density plasmas
Relativistic intensity laser interactions with low-density plasmas Open
We perform relativistic-intensity laser experiments using the Omega EP laser to investigate channeling phenomena and particle acceleration in underdense plasmas. A fundamental understanding of these processes is of importance to the hole-b…