Time-Resolved Measurements of the Hot Spot Density and Temperature on the National Ignition Facility
ORAL
Abstract
The electron density and temperature and their evolution in the hot spot of a Kr-doped, big-foot implosion target were measured for the first time using an absolutely calibrated, streaked, high-resolution x-ray spectrometer on the National Ignition Facility (NIF). Kr Heα and Heβ complexes near stagnation were recorded on a streak camera with a temporal resolution of ~30 ps, with signal levels provided by a simultaneous time-integrated measurement on the image plate. The electron density was inferred through stark-broadened line shapes and the temperature was derived from the relative intensities of dielectronic satellites. The measurements are compared with hydrodynamic simulations of the big-foot implosion, as well as collisional-radiative calculations for line intensities and shapes.
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Presenters
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Lan Gao
Princeton Plasma Physics Lab, Princeton Plasma Physics Laboratory
Authors
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Lan Gao
Princeton Plasma Physics Lab, Princeton Plasma Physics Laboratory
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Brian F Kraus
Princeton University, Princeton Plasma Physics Lab, Princeton Plasma Physics Laboratory
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K. Wayne Hill
Princeton Univ, Princeton Plasma Physics Lab, Princeton Plasma Phys Lab, Princeton Plasma Physics Laboratory
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M. Bitter
Princeton Plasma Physics Lab, Princeton Plasma Physics Laboratory
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P. Efthimion
Princeton Plasma Physics Laboratory
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Marilyn Beth Schneider
Lawrence Livermore Natl Lab, Lawrence Livermore National Lab, Lawrence Livermore National Laboratory
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C. A Thomas
Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory
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Robert L Kauffman
Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory
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Daniel B. Thorn
Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory
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Andrew G. MacPhee
Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory
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D. A Liedahl
Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory