Abstract
Strong shock waves (SSW) propagating in a cold condensed matter and
creating a dense plasma behind them are important for a wide variety of
fields ranging from astrophysics to ICF. For high post-shock pressures,
the electron contribution to the thermodynamic properties that are
responsible for the stability of SSW is significant. In the present
work, an analysis of two-dimensional instability of SSW in metals with
respect to spontaneous acoustic emission has been performed. Such an
instability may result in rippled shocks and, thus, in limitations on
the efficiency of target implosion. An empirical Hugoniot adiabatic that
represents a linear relation between the shock velocity D and the flow
velocity U behind the shock was assumed. To calculate the criteria for
spontaneous emission of sound, an equation of state is employed that is
appropriate in the range of the post-shock temperatures that are of
order or higher than the Fermi temperature. It was found that for
various metals characterized by various values of the slope S= dD/dU of
the Hugoniot adiabatic, the presence of free electrons increases the
threshold for spontaneous emission but cannot eliminate it.
| Original language | English GB |
|---|---|
| Title of host publication | American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congress on Plasma Physics October 23 - 27, 2000 Québec City, Canada Meeting ID: DPP00 |
| Place of Publication | Québec City |
| State | Published - 1 Oct 2000 |
| Externally published | Yes |