title: Evolution of surface structure in laser-preheated perturbed materials.
abstract: We report an experimental and computational study investigating the effects of laser preheat on the hydrodynamic behavior of a material layer. In particular, we find that perturbation of the surface of the layer results in a complex interaction, in which the bulk of the layer develops density, pressure, and temperature structure and in which the surface experiences instability-like behavior, including mode coupling. A uniform one-temperature preheat model is used to reproduce the experimentally observed behavior, and we find that this model can be used to capture the evolution of the layer, while also providing evidence of complexities in the preheat behavior. This result has important consequences for inertially confined fusion plasmas, which can be difficult to diagnose in detail, as well as for laser hydrodynamics experiments, which generally depend on assumptions about initial conditions in order to interpret their results.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87501, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Di Stefano
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87501, USA.
authors.forename: E C
authors.initials: EC
authors.lastname: Merritt
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87501, USA.
authors.forename: F W
authors.initials: FW
authors.lastname: Doss
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87501, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Flippo
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87501, USA.
authors.forename: A M
authors.initials: AM
authors.lastname: Rasmus
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87501, USA.
authors.forename: D W
authors.initials: DW
authors.lastname: Schmidt