Abstract
Imprinting of laser nonuniformity is a limiting factor in direct-drive inertial confinement fusion experiments, particularly when available laser smoothing is limited. A thin (∼400 Å) high-Z metal coating is found to substantially suppress laser imprint for planar targets driven by pulse shapes and intensities relevant to implosions on the National Ignition Facility while retaining low adiabat target acceleration. A hybrid of indirect and direct drive, this configuration results in initial ablation by x rays from the heated high-Z layer, creating a large standoff for perturbation smoothing.
Highlights
A thin (∼400 Å) high-Z metal coating is found to substantially suppress laser imprint for planar targets driven by pulse shapes and intensities relevant to implosions on the National Ignition Facility while retaining low adiabat target acceleration
Hydrodynamic instability seeded by laser nonuniformity is an important factor in the performance of direct-drive inertial confinement fusion (ICF) targets
Raw streaked face-on radiographs with 1.86 keV x rays and the resulting areal mass fluctuations in the range of 10–100 μm for uncoated and 400 Å Au coated targets
Summary
Hydrodynamic instability seeded by laser nonuniformity (laser imprint) is an important factor in the performance of direct-drive inertial confinement fusion (ICF) targets. Suppression of Laser Nonuniformity Imprinting Using a Thin High-Z Coating
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