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Title: Simulations of NOVA direct-drive Rayleigh-Taylor experiments

Directly driven Rayleigh-Taylor instability growth experiments being performed on NOVA have been simulated using the computer code, LASNEX. These experiments employ beams smoothed with random phase plates (RPP), and will later include smoothing by spectral dispersion (SSD). Samples are CH foils with or without imposed sinusoidal surface perturbations. Perturbation growth is diagnosed by means of x-ray backlighting. Calculated growth rates are fairly flat across the wavelength range of 20--80 {mu}m which can be accessed experimentally, and are moderately suppressed below classical growth rates. Perturbations of large enough initial amplitude that the contrast in the x-ray image is measurable from the start of the experiment quickly grow into the nonlinear regime. Smaller initial amplitudes result in a longer interval of linear growth, but the initial perturbation will not be detectable in the data. Structure which is predicted to develop from speckles in the RPP beam pattern, with and without SSD, is also presented.
Authors:
Publication Date:
OSTI Identifier:
6473318
Report Number(s):
UCRL-JC-104372; CONF-9011127--9
ON: DE91004881
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 32. annual meeting of the American Physical Society - Division of Plasma Physics (APS/DPP), Cincinnati, OH (USA), 12-16 Nov 1990
Research Org:
Lawrence Livermore National Lab., CA (USA)
Sponsoring Org:
DOE/DP
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; LASER-PRODUCED PLASMA; RAYLEIGH-TAYLOR INSTABILITY; INSTABILITY GROWTH RATES; INERTIAL CONFINEMENT; L CODES; NOVA FACILITY; PLASMA DIAGNOSTICS; PLASMA SIMULATION; X-RAY DETECTION; COMPUTER CODES; CONFINEMENT; DETECTION; INSTABILITY; PLASMA; PLASMA CONFINEMENT; RADIATION DETECTION; SIMULATION 700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology; 700107 -- Fusion Energy-- Plasma Research-- Instabilities; 700102 -- Fusion Energy-- Plasma Research-- Diagnostics