Growth rates of the ablative RayleighTaylor instability in inertial confinement fusion
Abstract
A simple procedure is developed to determine the Froude number Fr, the effective power index for thermal conduction ν, the ablationfront thickness L_{0}, the ablation velocity V_{a}, and the acceleration g of laseraccelerated ablation fronts. These parameters are determined by fitting the density and pressure profiles obtained from onedimensional numerical simulations with the analytic isobaric profiles of Kull and Anisimov [Phys. Fluids 29, 2067 (1986)]. These quantities are then used to calculate the growth rate of the ablative RayleighTaylor instability using the theory developed by Goncharov et al. [Phys. Plasmas 3, 4665 (1996)]. The complicated expression of the growth rate (valid for arbitrary Froude numbers) derived by Goncharov et al. is simplified by using reasonably accurate fitting formulas.
 Publication:

Physics of Plasmas
 Pub Date:
 May 1998
 DOI:
 10.1063/1.872802
 Bibcode:
 1998PhPl....5.1446B
 Keywords:

 52.35.Py;
 52.58.Ns;
 52.25.b;
 52.65.y;
 Macroinstabilities;
 Plasma properties;
 Plasma simulation