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Author Amendt, P. ♦ Glendinning, S. G. ♦ Hammel, B. A. ♦ Hay, R. G.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ INDIRECT DRIVE LASER IMPLOSION ♦ ASYMMETRY ♦ LASER TARGETS ♦ IMAGES ♦ NOVA FACILITY ♦ FOAMS ♦ TIME DEPENDENCE ♦ X RADIATION ♦ COLLOIDS ♦ DISPERSIONS ♦ ELECTROMAGNETIC RADIATION ♦ IMPLOSIONS ♦ IONIZING RADIATIONS ♦ LASER IMPLOSIONS ♦ RADIATIONS ♦ TARGETS 700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-) ♦ Inertial Confinement Devices(1992-)
Abstract Backlighting of low-density SiO[sub 2] aerogel balls (0.3 g/cc) in Nova hohlraums enables direct imaging of the indirectly driven ablative shock trajectory versus time. An immediate application of the technique is a new method for measuring drive temperature and asymmetry in Nova hohlraums. Measured drive asymmetries are exaggerated due to an increased shock speed in low-density foam balls. From the backlighter-imaged distortion of the radially converging shock, a potentially useful time-dependent flux asymmetry diagnostic is obtained. Results from a 3:1 peak-to-foot contrast ratio pulse shape ([ital ps]22) are analyzed and shown to agree with modeling. The current goal of the witness-ball effort on Nova is to identify the transition in flux on capsule from waist high (sausaging) to pole high (pancaking), thereby validating the technique as a promising symmetry diagnostic for the proposed National Ignition Facility.
ISSN 00346748
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-01-01
Publisher Place United States
Journal Review of Scientific Instruments
Volume Number 66
Issue Number 1


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