Physics – Plasma Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dppbi2006p&link_type=abstract
American Physical Society, 45th Annual Meeting of the Division of Plasma Physics, October 27-31, 2003, Albuquerque, New Mexico,
Physics
Plasma Physics
Scientific paper
The behaviour of hydrodynamic instabilities at the boundary between two materials changes if the materials compress or converge. These instabilities, in inertial confinement fusion and astrophysical situations, lead to mixing of the materials. Currently, there are no well accepted theories or computational models to describe these regimes so experiments are required to provide guidance on the behaviour of systems that are miscible, compressible and convergent in the presence of strong shocks. Experiments to study these changes in a convergent geometry are being performed with the Omega laser at the University of Rochester. Direct laser illumination of a cylindrical target launches a strong shock across hydrodynamically unstable interfaces formed between an epoxy ablator material on the outside, a buried aluminium marker layer and low-density CH foam on the inside. The unstable regions mix the marker into the two adjacent materials. Of particular interest is what happens when the mixing region is re-shocked. Experimentally, this is achieved by using a second, co-axial central cylinder to reflect the incident shock back into the mixing region. Using different materials, such as gold and copper layers on the inner cylinder varies the strength of the reflected shock. Data are presented showing how this change in shock strength affects the evolution of the marker material. Computer simulations from several hydrocodes, in both 2 and 3 dimensions, of several target variations are presented. Good agreement with the data obtained to date is shown. The role of preheat in target performance as well as the limitations of the basic target design are explored. Solutions to these limitations are suggested.
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