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Multi-Megajoule NIF: Ushering In a New Era in High Energy Density Science

Description: This paper describes the status of the stadium-sized National Ignition Facility (NIF), the world's largest laser system and first operational multi-megajoule laser. The 192-beam NIF, located at Lawrence Livermore National Laboratory (LLNL), is 96% complete and scheduled for completion in March 2009. The NIF laser will produce nanosecond laser pulses with energies up to approximately 4 MJ in the infrared (laser wavelength = 1.053-{micro}m) and 2MJ in the ultraviolet (laser wavelength = 0.35-{mic… more
Date: April 30, 2008
Creator: Keane, C & Moses, E I
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Chemical imaging of biological materials by NanoSIMS using isotopic and elemental labels

Description: The NanoSIMS 50 combines unprecedented spatial resolution (as good as 50 nm) with ultra-high sensitivity (minimum detection limit of {approx}200 atoms). The NanoSIMS 50 incorporates an array of detectors, enabling simultaneous collection of 5 species originating from the same sputtered volume of a sample. The primary ion beam (Cs{sup +} or O{sup -}) can be scanned across the sample to produce quantitative secondary ion images. This capability for multiple isotope imaging with high spatial resol… more
Date: April 10, 2006
Creator: Weber, P K; Fallon, S J; Pett-Ridge, J; Ghosal, S & Hutcheon, I D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

2005 Annual Health Physics Report for HEU Transparency Program

Description: During the 2005 calendar year, LLNL provided health physics support for the Highly Enriched Uranium Transparency Program (HEU-TP) in external and internal radiation protection and technical expertise into matters related to BDMS radioactive sources and Russian radiation safety regulatory compliance. For the calendar year 2005, there were 161 person-trips that required dose monitoring of the U.S. monitors. Of the 161 person-trips, 149 person-trips were SMVs and 12 person-trips were Transparency … more
Date: April 21, 2006
Creator: Radev, R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Climate Modeling using High-Performance Computing

Description: The Center for Applied Scientific Computing (CASC) and the LLNL Climate and Carbon Science Group of Energy and Environment (E&E) are working together to improve predictions of future climate by applying the best available computational methods and computer resources to this problem. Over the last decade, researchers at the Lawrence Livermore National Laboratory (LLNL) have developed a number of climate models that provide state-of-the-art simulations on a wide variety of massively parallel … more
Date: April 20, 2006
Creator: Mirin, A. A. & Wickett, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SMALL-SCALE IMPACT SENSITIVITY TESTING ON EDC37

Description: EDC37 was tested at LLNL to determine its impact sensitivity in the LLNL's drop hammer system. The results showed that impact sensitivities of the samples were between 86 cm and 156 cm, depending on test methods. EDC37 is a plastic bonded explosive consisting of 90% HMX, 1% nitrocellulose and binder. We recently conducted impact sensitivity testing in our drop hammer system and the results are presented in this report.
Date: April 28, 2008
Creator: HSU, P C; HUST, G & MAIENSCHEIN, J L
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DSP-Based dual-polarity mass spectrum pattern recognition for bio-detection

Description: The Bio-Aerosol Mass Spectrometry (BAMS) instrument analyzes single aerosol particles using a dual-polarity time-of-flight mass spectrometer recording simultaneously spectra of thirty to a hundred thousand points on each polarity. We describe here a real-time pattern recognition algorithm developed at Lawrence Livermore National Laboratory that has been implemented on a nine Digital Signal Processor (DSP) system from Signatec Incorporated. The algorithm first preprocesses independently the raw … more
Date: April 21, 2006
Creator: Riot, V; Coffee, K; Gard, E; Fergenson, D; Ramani, S & Steele, P
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Physical Sciences 2007 Science & Technology Highlights

Description: The Physical Sciences Directorate applies frontier physics and technology to grand challenges in national security. Our highly integrated and multidisciplinary research program involves collaborations throughout Lawrence Livermore National Laboratory, the National Nuclear Security Administration, the Department of Energy, and with academic and industrial partners. The Directorate has a budget of approximately $150 million, and a staff of approximately 350 employees. Our scientists provide exper… more
Date: April 7, 2008
Creator: Hazi, A U
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Quantifying uncertainties of a Soil-Foundation Structure-Interaction System under Seismic Excitation

Description: We applied a spectrum of uncertainty quantification (UQ) techniques to the study of a two-dimensional soil-foundation-structure-interaction (2DSFSI) system (obtained from Professor Conte at UCSD) subjected to earthquake excitation. In the process we varied 19 uncertain parameters describing material properties of the structure and the soil. We present in detail the results for the different stages of our UQ analyses.
Date: April 7, 2008
Creator: Tong, C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiographic Capabilities of the MERCURY Monte Carlo Code

Description: MERCURY is a modern, parallel, general-purpose Monte Carlo code being developed at the Lawrence Livermore National Laboratory. Recently, a radiographic capability has been added. MERCURY can create a source of diagnostic, virtual particles that are aimed at pixels in an image tally. This new feature is compared to the radiography code, HADES, for verification and timing. Comparisons for accuracy were made using the French Test Object and for timing were made by tracking through an unstructured … more
Date: April 7, 2008
Creator: McKinley, M. Scott & Schach von Wittenau, Alexis E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

PBXN-9 Ignition Kinetics and Deflagration Rates

Description: The ignition kinetics and deflagration rates of PBXN-9 were measured using specially designed instruments at LLNL and compared with previous work on similar HMX based materials. Ignition kinetics were measured based on the One Dimensional Time-to-Explosion combined with ALE3D modeling. Results of these experiments indicate that PBXN-9 behaves much like other HMX based materials (i.e. LX-04, LX-07, LX-10 and PBX-9501) and the dominant factor in these experiments is the type of explosive, not the… more
Date: April 24, 2008
Creator: Glascoe, E; Maienschein, J; Burnham, A; Koerner, J; Hsu, P & Wemhoff, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modified Visible and Infrared Optical Design for the ITER Upper Ports

Description: This document reports the results of a follow-on optical design study of visible-light and infrared optics for the ITER upper ports, performed by LLNL under contract for the US ITER Project Office. The major objectives of this work are to move the viewing aperture closer to the plasma so that the optical path does not cut through any adjacent blanket shield module other than the module designated for the port; move optics forward into the port tube to increase the aperture size and therefore im… more
Date: April 24, 2008
Creator: Lasnier, C; Seppala, L & Morris, K
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stabilized Spheromak Fusion Reactors

Description: The U.S. fusion energy program is focused on research with the potential for studying plasmas at thermonuclear temperatures, currently epitomized by the tokamak-based International Thermonuclear Experimental Reactor (ITER) but also continuing exploratory work on other plasma confinement concepts. Among the latter is the spheromak pursued on the SSPX facility at LLNL. Experiments in SSPX using electrostatic current drive by coaxial guns have now demonstrated stable spheromaks with good heat conf… more
Date: April 3, 2007
Creator: Fowler, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pulsed Power for Solid-State Lasers

Description: Beginning in the early 1970s, a number of research and development efforts were undertaken at U.S. National Laboratories with a goal of developing high power lasers whose characteristics were suitable for investigating the feasibility of laser-driven fusion. A number of different laser systems were developed and tested at ever larger scale in pursuit of the optimum driver for laser fusion experiments. Each of these systems had associated with it a unique pulsed power option. A considerable amou… more
Date: April 19, 2007
Creator: Gagnon, W.; Albrecht, G.; Trenholme, J. & Newton, M.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
open access

High Spectral Resolution X-ray Observation of Magnetic CVs: EX Hya

Description: In magnetic cataclysmic variables (CVs) the primary is a highly magnetized white dwarf (WD) whose field controls the accretion flow close to the WD, leading to a shock and accretion column that radiate chiefly in X-rays. We present preliminary results from a 500 ks Chandra HETG observation of the brightest magnetic CV EX Hya. From the observational dataset we are able to measure the temperature and density at different points of the cooling accretion column using sensitive line ratios. We also … more
Date: April 7, 2008
Creator: Luna, G; Brickhouse, N S & Mauche, C W
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Hyperion Project: Partnership for an Advaned Technology Cluster Testbed

Description: The Hyperion project offers a unique opportunity to participate in a community-driven testing and development resource at a scale beyond what can be accomplished by one entity alone. Hyperion is a new strategic technology partnership intended to support the member-driven development and testing at scale. This partnership will allow commodity clusters to scale up to meet the growing demands of customers multi-core petascale simulation environments. Hyperion will tightly couple together the outst… more
Date: April 28, 2008
Creator: Seager, M & Leininger, M
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laser-Material Interaction Studies Utilizing the Solid-State Heat Capacity Laser

Description: A variety of laser-material interaction experiments have been conducted at Lawrence Livermore National Laboratory (LLNL) utilizing the solid-state heat capacity laser (SSHCL). For these series of experiments, laser output power is 25kW, on-target laser spot sizes of up to 16 cm by 16 cm square, with air speeds of approximately 100 meters per second flowing across the laser-target interaction surface as shown in Figure 1. The empirical results obtained are used to validate our simulation models.
Date: April 19, 2007
Creator: Yamamoto, R.; Parker, J.; Boley, C.; Cutter, K.; Fochs, S. & Rubenchik, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

2007 Annual Health Physics Report for the HEU Transparency Program

Description: During the 2007 calendar year, Lawrence Livermore National Laboratory (LLNL) provided health physics support for the Highly Enriched Uranium (HEU) Transparency Program for external and internal radiation protection and technical expertise related to BDMS radioactive sources and Russian radiation safety regulatory compliance. For the calendar year 2007, there were 172 person-trips that required dose monitoring of the U.S. monitors. Of the 172 person-trips, 160 person-trips were SMVs and 12 perso… more
Date: April 9, 2008
Creator: Radev, R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Performance Evaluation of Whole Body Counting Facilities in the Marshall Islands (2002-2005)

Description: The United States Department of Energy (U.S. DOE) has recently implemented a series of strategic initiatives to address long-term radiological surveillance needs at former U.S. nuclear test sites in the Marshall Islands (https://eed.llnl.gov/mi/). Local atoll governments have been actively engaged in developing shared responsibilities for protecting the health and safety of resettled and resettling population at risk from exposure to elevated levels of residual fallout contamination in the envi… more
Date: April 3, 2007
Creator: Kehl, S R; Hamilton, T; Jue, T & Hickman, D
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Lessons learned at 208K: Towards Debugging Millions of Cores

Description: Petascale systems will present several new challenges to performance and correctness tools. Such machines may contain millions of cores, requiring that tools use scalable data structures and analysis algorithms to collect and to process application data. In addition, at such scales, each tool itself will become a large parallel application--already, debugging the full Blue-Gene/L (BG/L) installation at the Lawrence Livermore National Laboratory requires employing 1664 tool daemons. To reach suc… more
Date: April 14, 2008
Creator: Lee, G L; Ahn, D H; Arnold, D C; de Supinski, B R; Legendre, M; Miller, B P et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Demonstration of an Electronic Gamma-Rau Spectrum Synthesizer

Description: The goal of this demonstration was to show that it is possible to generate electronic signals that can accurately mimic the signals that are produced by a high-purity germanium (HPGe) gamma-ray detector. As an example of this fidelity, we decided to show that it was possible to perform a complex, multiplet-resolution analysis of a portion of the spectrum acquired from the gamma-ray spectrum synthesizer. We further showed that the results of this analysis were consistent with what would be obtai… more
Date: April 3, 2002
Creator: Luke, S J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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