ABSTRACT
External pressure nonuniformity and imperfection of target construction and initial inhomogeneities in it lead to the decrease of thermonuclear target compression ratio and temperature, as compared with the case of ideal spherical symmetry. Initial amplitude of perturbations and, especially, its growth during compression due to the development of hydrodynamic instabilities promote target form deformation. The main role is played by the Rayleigh-Taylor instability, that is, the instability of a heavy liquid over a light one in the gravity field. Since the size of the instability region is small as compared with the characteristic scale of the plasma motion region scale lengths, many effects can be described within the framework of a relatively simple plane geometry model, considering the unperturbed plasma motion to be one-dimensional. Various inertial confinement fusion approaches differ first of all in the methods of ablation pressure creation.
