Multidimensional analysis of direct-drive, plastic-shell implosions on OMEGA

Journal Article · Sun May 15 04:00:00 EDT 2005 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.1882333· OSTI ID:20736599

Radha, P B; Collins, T J.B.; Delettrez, J A; Elbaz, Y; Epstein, R; Glebov, V Yu; Goncharov, V N; Keck, R L; Knauer, J P; Marozas, J A; Marshall, F J; McCrory, R L; McKenty, P W; Meyerhofer, D D; Regan, S P; Sangster, T C; Seka, W; Shvarts, D; Skupsky, S; Srebro, Y ^[1]

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1. Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623 (United States)

Direct-drive, plastic shells imploded on the OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] with a 1 ns square pulse are simulated using the multidimensional hydrodynamic code DRACO in yield degradation in 'thin' shells is primarily caused by shell breakup during the acceleration phase due to short-wavelength (l>50, where l is the Legendre mode number) perturbation growth, whereas 'thick' shell performance is influenced primarily by long and intermediate modes (l{<=}50). Simulation yields, temporal history of neutron production, areal densities, and x-ray images of the core compare well with experimental observations. In particular, the thin-shell neutron production history falls off less steeply than one-dimensional predictions due to shell-breakup-induced undercompression and delayed stagnation. Thicker, more-stable shells show burn truncation due to instability-induced mass flow into the colder bubbles. Estimates of small-scale mix indicate that turbulent mixing does not influence primary neutron yields.

• OSTI ID: 20736599
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 12; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DIRECT DRIVE LASER IMPLOSION
PLASMA
PLASMA DENSITY
PLASMA GUNS
PLASMA INSTABILITY
PLASMA SIMULATION
TURBULENCE