Hot-spot mix in ignition-scale implosions on the NIF

Regan, S P; Epstein, R; McCrory, R L; Meyerhofer, D D; Sangster, T C; Hammel, B A; Suter, L J; Ralph, J; Scott, H; Barrios, M A; Bradley, D K; Callahan, D A; Cerjan, C; Collins, G W; Dixit, S N; Doeppner, T; Edwards, M J; Farley, D R; Glenn, S; Glenzer, S H; others, and

doi:10.1063/1.3694057

Title: Hot-spot mix in ignition-scale implosions on the NIF

Journal Article · Tue May 15 00:00:00 EDT 2012 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3694057· OSTI ID:22072411

Regan, S P; Epstein, R; McCrory, R L; Meyerhofer, D D; Sangster, T C ^[1]; Hammel, B A; Suter, L J; Ralph, J; Scott, H; Barrios, M A; Bradley, D K; Callahan, D A; Cerjan, C; Collins, G W; Dixit, S N; Doeppner, T; Edwards, M J; Farley, D R; Glenn, S; Glenzer, S H ^[2] more »

Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299 (United States)
Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

Ignition of an inertial confinement fusion (ICF) target depends on the formation of a central hot spot with sufficient temperature and areal density. Radiative and conductive losses from the hot spot can be enhanced by hydrodynamic instabilities. The concentric spherical layers of current National Ignition Facility (NIF) ignition targets consist of a plastic ablator surrounding a thin shell of cryogenic thermonuclear fuel (i.e., hydrogen isotopes), with fuel vapor filling the interior volume [S. W. Haan et al., Phys. Plasmas 18, 051001 (2011)]. The Rev. 5 ablator is doped with Ge to minimize preheat of the ablator closest to the DT ice caused by Au M-band emission from the hohlraum x-ray drive [D. S. Clark et al., Phys. Plasmas 17, 052703 (2010)]. Richtmyer-Meshkov and Rayleigh-Taylor hydrodynamic instabilities seeded by high-mode () ablator-surface perturbations can cause Ge-doped ablator to mix into the interior of the shell at the end of the acceleration phase [B. A. Hammel et al., Phys. Plasmas 18, 056310 (2011)]. As the shell decelerates, it compresses the fuel vapor, forming a hot spot. K-shell line emission from the ionized Ge that has penetrated into the hot spot provides an experimental signature of hot-spot mix. The Ge emission from tritium-hydrogen-deuterium (THD) and deuterium-tritium (DT) cryogenic targets and gas-filled plastic-shell capsules, which replace the THD layer with a mass-equivalent CH layer, was examined. The inferred amount of hot-spot-mix mass, estimated from the Ge K-shell line brightness using a detailed atomic physics code [J. J. MacFarlane et al., High Energy Density Phys. 3, 181 (2006)], is typically below the 75-ng allowance for hot-spot mix [S. W. Haan et al., Phys. Plasmas 18, 051001 (2011)]. Predictions of a simple mix model, based on linear growth of the measured surface-mass modulations, are consistent with the experimental results.

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OSTI ID:: 22072411

Journal Information:: Physics of Plasmas, Vol. 19, Issue 5; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BRIGHTNESS
CAPSULES
CAVITY RESONATORS
DEUTERIUM
DISTURBANCES
DOPED MATERIALS
GERMANIUM
HOT SPOTS
HYDROGEN
ICF DEVICES
INERTIAL CONFINEMENT
K SHELL
PLASMA INSTABILITY
PLASTICS
SPHERICAL CONFIGURATION
THERMONUCLEAR FUELS
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Title: Hot-spot mix in ignition-scale implosions on the NIF

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