J. W. Bates
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View article: Rear surface isolated defect evolution in laser accelerated targets
Rear surface isolated defect evolution in laser accelerated targets Open
The hydrodynamic growth of pre-imposed isolated rear-surface defects, specifically 9–20 μm deep by 8–20 μm wide laser-machined grooves on planar polystyrene foils, was investigated using the NIKE krypton-fluoride laser facility at the U.S.…
View article: Suppressing parametric instabilities in direct-drive inertial-confinement-fusion plasmas using broadband laser light
Suppressing parametric instabilities in direct-drive inertial-confinement-fusion plasmas using broadband laser light Open
It has long been recognized that broadband laser light has the potential to control parametric instabilities in inertial-confinement-fusion (ICF) plasmas. Here, we use results from laser-plasma-interaction simulations to estimate the bandw…
View article: Direct drive with the argon fluoride laser as a path to high fusion gain with sub-megajoule laser energy
Direct drive with the argon fluoride laser as a path to high fusion gain with sub-megajoule laser energy Open
Argon fluoride (ArF) is currently the shortest wavelength laser that can credibly scale to the energy and power required for high gain inertial fusion. ArF's deep ultraviolet light and capability to provide much wider bandwidth than other …
View article: Laser-Plasma Interactions Enabled by Emerging Technologies
Laser-Plasma Interactions Enabled by Emerging Technologies Open
An overview from the past and an outlook for the future of fundamental laser-plasma interactions research enabled by emerging laser systems.
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: Radiative and atomic properties of C and CH plasmas in the warm-dense-matter regime
Radiative and atomic properties of C and CH plasmas in the warm-dense-matter regime Open
A theoretical model based on the method of super transition arrays (STA) is used to compute the emissivities, opacities and average ionization states of carbon (C) and polystyrene (CH) plasmas in the warm-dense matter regime in which the c…
View article: Mitigation of cross-beam energy transfer in inertial-confinement-fusion plasmas with enhanced laser bandwidth
Mitigation of cross-beam energy transfer in inertial-confinement-fusion plasmas with enhanced laser bandwidth Open
Cross-beam energy transfer (CBET) is a significant energy-loss mechanism in directly driven inertial-confinement-fusion (ICF) targets. One strategy for mitigating CBET is to increase the bandwidth of the laser light, thereby disrupting the…
View article: Origins and Scaling of Hot-Electron Preheat in Ignition-Scale Direct-Drive Inertial Confinement Fusion Experiments
Origins and Scaling of Hot-Electron Preheat in Ignition-Scale Direct-Drive Inertial Confinement Fusion Experiments Open
Planar laser-plasma interaction (LPI) experiments at the National Ignition Facility (NIF) have allowed access for the first time to regimes of electron density scale length (∼500 to 700 μm), electron temperature (∼3 to 5 keV), and laser in…
View article: Laser-direct-drive program: Promise, challenge, and path forward
Laser-direct-drive program: Promise, challenge, and path forward Open
Along with laser-indirect (X-ray)-drive and magnetic-drive target concepts, laser direct drive is a viable approach to achieving ignition and gain with inertial confinement fusion. In the United States, a national program has been establis…
View article: Numerical simulations of the ablative Rayleigh-Taylor instability in planar inertial-confinement-fusion targets using the FastRad3D code
Numerical simulations of the ablative Rayleigh-Taylor instability in planar inertial-confinement-fusion targets using the FastRad3D code Open
The ablative Rayleigh-Taylor (RT) instability is a central issue in the performance of laser-accelerated inertial-confinement-fusion targets. Historically, the accurate numerical simulation of this instability has been a challenging task f…
View article: Polar-direct-drive experiments at the National Ignition Facility
Polar-direct-drive experiments at the National Ignition Facility Open
Polar-direct-drive experiments at the National Ignition Facility (NIF) are being used to validate direct-drive-implosion models. Energy coupling and fast-electron preheat are the primary issues being studied in planar and imploding geometr…
View article: Hydrodynamic simulations of long-scale-length plasmas for two-plasmon-decay planar-target experiments on the NIF
Hydrodynamic simulations of long-scale-length plasmas for two-plasmon-decay planar-target experiments on the NIF Open
The two-plasmon-decay (TPD) instability can be detrimental for direct-drive inertial confinement fusion because it generates high-energy electrons that can preheat the target, thereby reducing target performance. Hydrodynamic simulations t…