Planar indirect-drive Rayleigh-Taylor experiments on Nova

Details Planar indirect-drive Rayleigh-Taylor experiments on Nova Planar indirect-drive Rayleigh-Taylor experiments on Nova

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991anab.conf...15r&link_type=abstract

Presented at the 21st Annual Anomalous Absorption Conference, Banff (Canada), 15-19 Apr. 1991

Computer Science

Computerized Simulation, Coupled Modes, Implosions, Laser Plasmas, Perturbation, Taylor Instability, High Gain, Sine Waves, Spectra, Thickness

Scientific paper

A critical issue for laser-driven fusion is the extent to which surface perturbations grow during acceleration in high-gain implosion designs. To address this issue, an experimental and theoretical effort was initiated at the Nova Laser Facility to study perturbation growth due to the Rayleigh-Taylor instability on planar foils accelerated radiatively by a shaped drive. The growth of single-mode sinusoidal perturbations was measured in a set of experiments that varied separately the perturbation amplitude, wavelength, and foil thickness. To investigate mode coupling, foils were accelerated with two modes (wavelengths lambda(sub 1,2) = 50 micron, 75 micron) superposed on the surface. As a first attempt at determining the effect of a broad spectrum of modes, foils were recently accelerated whose surface perturbation is the superposition of eight modes (lambda(sub 1-8) = 22.5 to 180 micron) with random amplitudes. The experimental results and comparisons with 2-dimensional computer simulations will be presented.

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