Off-Hugoniot characterization of alternative inertial confinement fusion ablator materials.

[摘要] The ablation material used during the National Ignition Campaign, a glow- discharge polymer (GDP), does not couple as efficiently as simulations indicated to the multiple- shock inducing radiation drive environment created by laser power profile [1]. We investigate the performance of two other ablators, boron carbide (B4C) and high-density carbon (HDC) and compare with GDP under the same hohlraum conditions. Ablation performance is determined through measurement of the shock speed produced in planar samples of the ablator subjected to the identical multiple-shock inducing radiation drive environments that are similar to a generic three-shock ignition drive. Simulations are in better agreement with the off-Hugoniot performance of B4C than either HDC or GDP.

[发布机构] Lawrence Livermore National Laboratory, P.O. Box 808, Livermore; CA; 94551-0808, United States^1;General Atomics, San Diego; CA; 92121, United States^2

[关键词] Ablation performance;Glow discharge polymers;Hohlraums;Hugoniot;Laser power profiles;Multiple shocks;Shock ignitions;Shock speed