Measurements of early time radiation asymmetry in vacuum and methane-filled {ital Hohlraums} with the reemission ball technique
- Los Alamos National Laboratory, Los Alamos, New Mexico87544 (United States)
In a previous paper [Phys. Rev. E {bold 53}, 5240 (1996)], we presented experimental results of a technique for measuring time resolved symmetry in vacuum {ital Hohlraums} irradiated with the laser beams from the NOVA laser located at Lawrence Livermore National Laboratory. The experimental method involved x-ray imaging a high-Z ball placed in the center of a laser irradiated vacuum {ital Hohlraum}. The signal from the high-Z ball was measured along the {ital Hohlraum} axis, and compared with calculations. In this paper, using this experimental technique, we present time-dependent reemission measurements and calculations of the drive symmetry in vacuum and methane-filled {ital Hohlraums} for a shaped laser pulse. We also present a method for determining the time dependence of the radiation flux from the measured reemission signal ratios, and do a modal analysis to determine the values of the dominant Legendre components. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 627806
- Journal Information:
- Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics Journal Issue: 4 Vol. 57; ISSN PLEEE8; ISSN 1063-651X
- Country of Publication:
- United States
- Language:
- English
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