Physics – Plasma Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dpp.r8q03m&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 16-20, 1998 New Orleans, LA, abstract #R8Q.03
Physics
Plasma Physics
Scientific paper
We have extended earlier computational and experimental studies^1 of Raleigh-Taylor instability of thin planar copper foils radiatively driven in NOVA hohlraums. The foils were typically 18 μm thick with 45 μm sinusoidal perturbations of 0.5 μm amplitude. They were accelerated by a ``NOVA PS26" pulse yielding a maximum radiation temperature of 195 eV after about 1.5 ns. The developing bubble-and-spike pattern was studied with a 6.7 keV backlighter. Fourier analysis of the integrated axial ρdz data yields an effective amplitude of the first harmonic growing to 4 μm during by 3 ns in agreement with LASNEX and RAGE calculations. RAGE is a 2T grey diffusion Eulerian code with automatic mesh refinement. Both 3T and LTE multi-group diffusion were employed with LASNEX. Additional studies have included a 5 μm layer of beryllium on the drive side. The foil dynamics will be described for cases with the beryllium attached to the copper - adding to the drive pressure - and separated, so as to mildly filter the spectrum. ^1 G. T. Schappert, W. W. Hsing, S. E. Caldwell, D. E. Hollowell, R. P. Weaver, and B. A. Remington, Bull. Am. Phys. Soc. 7, 1515 (1996). Work supported by the USDOE.
Caldwell S. E.
Hollowell D. E.
Mason Justin R.
Schappert G. T.
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