Physics – Plasma Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dpp.u9p06c&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 16-20, 1998 New Orleans, LA, abstract #U9P.06
Physics
Plasma Physics
Scientific paper
Varnum et al. and Watt et al. at this Conference discuss the design, motivations, and experimental results of high-convergence indirectly driven double-shell capsule implosion experiments using both the Nova laser at LLNL and the Omega laser at the University of Rochester. I present the details of a hydrodynamic stability analysis of these experiments, using a linear mode saturation and superposition model which was previously applied to single-shell implosion experiments on Nova. It is based on linear-regime single-mode growth factors, and does not include possible nonlinear effects other than saturation. I first discuss the model and how it is implemented, show the results of single mode linear growth calculations for modes up to 100, and the resulting bubble and spike amplitudes resulting from the growth of measured surface perturbations on both the inner and outer shells. Growth at the inside surface does not begin until the shock first reaches the gas/pusher interface, well after the laser pulse turns off and remains modest at the time of peak neutron production. The yield degradation from this much mix is small; neutron yield is 2.9x10^8, about 85% of the clean (unmixed) 1-D calculated yield. *Work performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore National Laboratory under Contract W-7405-ENG-48.
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