Showing papers by "R. E. Olson published in 2008"
01 May 2008
TL;DR: In this paper, the macroscopic and microscopic hydrodynamic and equation of state response of these candidate ablators to NIC-relevant x-ray drive has been validated by a multi-lab experimental program.
Abstract: To validate our modeling of the macroscopic and microscopic hydrodynamic and equation of state response of these candidate ablators to NIC-relevant x-ray drive, a multi-lab experimental program has been verifying the behavior of these new ablators. First, the pressures for onset and termination of melt for both Be and HDC under single or double shock drive has been measured at the Z and OMEGA facilities. Second, the level and effect of hard x-ray preheat has been quantified in scaled experiments at the Omega facility. Third, a long planar x-ray drive has been developed to check 2D and 3D perturbation growth at the ablation front upon acceleration. The concept has been extended to study growth at and near the ablator-ice interface upon deceleration. In addition, experimental designs for validating the expected low level of perturbation seeding due to possible residual microstructure after melt during first and second shock transit in Be and HDC have been completed. Results so far suggest both Be and HDC can remain ablator choices and have guided pulse shaping designs.
10 citations
TL;DR: The National Ignition Campaign requirements for this streaked radiography diagnostic, the instrument design, and the planned test experiments are described.
Abstract: A streaked radiography diagnostic has been proposed as a technique to determine the ablator mass remaining in an inertial confinement fusion ignition capsule at peak velocity. This instrument, the “HXRI-5,” has been designed to fit within a National Ignition Facility Diagnostic Instrument Manipulator. The HXRI-5 will be built at Sandia National Laboratories (SNL), and initial testing will be done at the SNL Z-Beamlet Facility. In this paper, we will describe the National Ignition Campaign requirements for this diagnostic, the instrument design, and the planned test experiments.
4 citations
12 May 2008
TL;DR: The light ion fusion program at Sandia National Laboratories is reviewed in this paper, which is based on the indirect drive target concept and has the long-term objective to obtain high yield in a microfusion facility.
Abstract: The light ion fusion program at Sandia National Laboratories is reviewed. The program is based on the indirect‐drive target concept and has the long‐term objective to obtain high yield in a microfusion facility. The near‐term technical effort will focus on increasing intensity and demonstrating 100 eV temperature in an ion hohlraum. Some concepts were tested experimentally confirming the accessibility of anticipated goals. (AIP)