Physics – Plasma Physics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dpp.hi105g&link_type=abstract
American Physical Society, 41st Annual Meeting of the Division of Plasma Physics, November 15-19, 1999 Seattle, WA, abstract #HI
Physics
Plasma Physics
Scientific paper
Many NIF ignition capsule designs with indirect radiation drive use a copper doped beryllium ablator surrounding DT fuel. It is highly likely that the construction of these targets will require either a bonded equatorial joint between doped beryllium hemi-shells or some other perturbation. This has led to the study of the effect of isolated non-periodic inhomogeneities on capsule hydrodynamics and yield. Through experiments with indirect radiation drive on the Nova and Omega lasers, and simulations in planar geometry using the Rage and Lasnex codes, we have found a general picture for the development of shocks in slabs with joints and gaps. The presence of such discontinuities results in the propagation of hydrodynamic disturbances outward from the defect. The shock front in the background material is qualitatively modified according to whether the principal shock in the background material is more or less advanced than the shock in the target defect. Additional experiments with similar drive on the Nova laser have been done in a cylindrical hohlraum for cylindrical targets consisting of an optional outer shell of low density foam, enclosing a second shell of relatively dense ablator material with a low density gap extending partially through it, outside of an inner central cylinder of low density foam. Since the second shell is relatively thin, the shock behavior within it is similar to that within the planar slab with the same gap. However these experiments also allow for the probing of breakout of the structured shock into the central lower density region and the subsequent convergence of the shock. Physical models for the effect of gap and joint discontinuities on target behavior have been established through the agreement of experiment and modeling in planar and cylindrical geometry. These have been used in the design of spherical NIF capsules with such target defects.
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