Numerical Analysis on the Stability of Laser-Driven-Pellet Implosion

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Abstract
The dynamical stability of the implosion of a laser-driven pellet is investigated by using the linearized three-dimensional and nonlinear two-dimensional hydrodynamic equations. In these calculations, the following conclusions are obtained; 1) the growth rate of a perturbation is very sensitive to the way how the laser energy is supplied in time into the pellet; 2) the region where the perturbation has a positive growth rate varies with the wave length of the perturbation; 3) the growth of a perturbation is sensitive to the pellet structure; and 4) nonlinear mechanisms have a tendency to stabilize the perturbations.