168 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Lawrence Livermore National Laboratory"  
Results: 1 - 24 next
open access

Astronomy Applications of Adaptive Optics at Lawrence Livermore National Laboratory

Description: Astronomical applications of adaptive optics at Lawrence Livermore National Laboratory (LLNL) has a history that extends from 1984. The program started with the Lick Observatory Adaptive Optics system and has progressed through the years to lever-larger telescopes: Keck, and now the proposed CELT (California Extremely Large Telescope) 30m telescope. LLNL AO continues to be at the forefront of AO development and science.
Date: April 23, 2003
Creator: Bauman, B J & Gavel, D T
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurement of the polarization of the K-shell resonance line emission of S13+ and S14+ at relativistic electron beam energies.

Description: We have measured the polarization of the heliumlike sulfur resonance line 1s2p {sup 1}P{sub 1} {yields} 1s{sup 2} {sup 1}S{sub 0}, and of the blend of the lithiumlike sulfur resonance lines 1s2s2p {sup 2}P{sub 3/2} {yields} 1s{sup 2}2s {sup 2}S{sub 1/2} and 1s2s2p {sup 2}P{sub 1/2} {yields} 1s{sup 2}2s {sup 2}S{sub 1/2} as a function of electron beam energy from near threshold to 144 keV. These lines were excited with the LLNL high-energy electron beam ion trap and measured using a newly modifi… more
Date: April 6, 2004
Creator: Robbins, D; Faenov, A Y; Pikuz, T; Chen, H; Beiersdorfer, P; May, M et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Astro-E2 XRS/EBIT Microcalorimeter XC-ray Spectrometer

Description: The X-ray Spectrometer (XRS) instrument is a revolutionary non-dispersive spectrometer that will form the basis for the Astro-E2 observatory to be launched in 2005. We have recently installed a flight spare XRS microcalorimeter spectrometer at the EBIT-I and SuperEBIT facility at LLNL replacing the XRS from the earlier Astro-E mission and providing twice the resolving power. The XRS microcalorimeter is an x-ray detector that senses the heat deposited by the incident photon. It achieves a high e… more
Date: April 16, 2004
Creator: Porter, F S; Brown, G V; Boyce, K R; Kelley, R L; Kilbourne, C A; Beiersdorfer, P et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A 3D Frictional Segment-to-Segment Contact Method for Large Deformations and Quadratic Elements

Description: Node-on-segment contact is the most common form of contact used today but has many deficiencies ranging from potential locking to non-smooth behavior with large sliding. Furthermore, node-on-segment approaches are not at all applicable to higher order discretizations (e.g. quadratic elements). In a previous work, [3, 4] we developed a segment-to-segment contact approach for eight node hexahedral elements based on the mortar method that was applicable to large deformation mechanics. The approach… more
Date: April 1, 2004
Creator: Puso, M; Laursen, T & Solberg, J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Detecting antipersonnel mines with a handheld parabolic reflector transmitter/multistatic receiver impulse gpr

Description: A novel handheld time-domain array GPR antipersonnel mine detection system using an offset paraboloidal reflector antenna is described. The reflector collimates rays from an ultra-wideband transmitting feed, directing the microwave impulse forward, in front of the antenna structure. As such, much of the ground reflected wave is directed further forward, away from the operator, the reflector, and the receiving antennas, and thereby reducing the major source of clutter. The wave transmitted into … more
Date: April 10, 2000
Creator: Rappaport, C.; Yang, B.; Azevedo, S.; Rosenbury, T.; Gough, J. & Dean, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

National NIF Diagnostic Program Fiscal Year 2002 Second Quarter Report

Description: Since October 2001 the development of the facility diagnostics for NIF has been funded by the NIF Director through the National NIF Diagnostic Program (NNDP). The current emphasis of the NNDP is on diagnostics for the early NIF quad scheduled to be available for experiment commissioning in FY03. During the past six months the NNDP has set in place processes for funding diagnostics, developing requirements for diagnostics, design reviews and monthly status reporting. Those processes are describe… more
Date: April 1, 2002
Creator: MacGowan, B
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Verification & Validation: Goals, Methods, Levels, and Metrics

Description: This work briefly summarizes the current status of the V and V Program at LLNL regarding goals, methods, timelines, and issues for Verification and Validation (V and V) with Uncertainty Quantification (UQ). The goals are to evaluate various V and V methods, to apply them to computational simulation analyses, and integrate them into methods for Quantitative Certification techniques for the nuclear stockpile. Methods include qualitative and quantitative V and V processes with numerical values for… more
Date: April 29, 2003
Creator: Logan, R W & Nitta, C K
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

2004 Annual Health Physics Report for the HEU Transparency Program

Description: During the 2004 calendar year, LLNL provided health physics support for the Highly Enriched Uranium Transparency Implementation Program (HEU-TIP) 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 2004, there were 200 person-trips that required dose monitoring of the U.S. monitors. Of the 200 person-trips, 183 person-trips were SMVs and 17 person-trips we… more
Date: April 1, 2005
Creator: Radev, R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Filter-Fluorescer Diagnostic System (FFLEX) for the National Ignition Facility (NIF)

Description: An early Filter-Fluorescer Diagnostic System (FFLEX) is being fielded at the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL) to measure the amount of hard x-rays (20 < hv < 150 keV) generated in laser fusion experiments. From these measurements we hope to quantify the number of hot (20 to 50 keV) electrons produced in laser fusion experiments. The Measurement of hot electron production is important for ignition experiments because these electrons can preh… more
Date: April 13, 2004
Creator: McDonald, J. W.; Kauffman, R. L.; Celeste, J. R.; Rhodes, M. A.; Lee, F. D.; Suter, L. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of LLNL Methodology for Nonnuclear Safety Bases

Description: The objective of this paper is to introduce the process and philosophies used to develop LLNL methodology for performing nonnuclear safety bases. Our former approach needed revision in order to implement the new Work Smart Standard (WSS), 'Safety Basis Requirements for Nonnuclear Facilities at Lawrence Livermore National Laboratory Site Specific Standard' (UCRL-ID-150214), approved in 2003 and revised January, 2004. This work relates directly to the following workshop theme: 'Improvements in Ch… more
Date: April 26, 2004
Creator: van Warmerdam, C M & Pinkston, D M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Detection of nuclear threats in large cargo containers

Description: In 2003 scientists at the Lawrence Livermore National Laboratory, the Lawrence Berkeley National Laboratory, and the University of California at Berkeley undertook a collaborative effort. The goal of this collaboration is to develop a concept for an active neutron interrogation system that can detect small masses of contraband fissile material in intermodal cargo containers--roughly five kg of highly-enriched-uranium or one kg of plutonium--even when well shielded by thick cargo. It is essentia… more
Date: April 19, 2004
Creator: Gosnell, T B
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Durability and natural mineral studies carried out to support development of waste forms for immobilisation of plutonium interim report: April 30, 1999

Description: This report details the work undertaken at ANSTO under Project 2 of the State of Work with Lawrence Livermore National Laboratory (document B345772). In this Statement of Work, it was detailed that the following tasks would be carried out: Task 2.1--Corrosion tests on monoliths. This task was to assess the durability of ''impurity samples'' produced in Task 1.4, and ''near-equilibrium processing condition samples'' produced in Task 1.2. Task 2.2--Corrosion tests on powdered samples. This task w… more
Date: April 30, 1999
Creator: Hart, K P; Lumpkin, G R; Zhang, Y; Loi, E & Leung, S
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Smoke Dispersion Simulations for Prescribed Burns at Site 300, Lawrence Livermore National Laboratory

Description: Each year, as part of its ongoing commitment to safe operating practices Lawrence Livermore National Laboratory (LLNL) conducts prescribed burns at its Site 300 complex. LLNL consistently adheres to stringent, self-imposed safety standards in all of its activities, and the annual prescribed burning at Site 300 is done to prevent an accumulation of vegetative fuels (primarily grasses) that could cause an unacceptable risk of wildfire ignition. The LLNL prescribed burn procedure (Burklin, 2001) c… more
Date: April 4, 2002
Creator: Bradley, M M; Aluzzi, F J; Vogt, P J; Hall, C H; Neher, L A & Wilder, L A
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Interim report on task 1.1: single-phase sample production to Lawrence Livermore National Laboratory for Contract B345772

Description: To properly interpret empirical data on the leaching and physical properties of the baseline ceramic, it is necessary but not sufficient to understand the corresponding behaviors of the main constituent phases, pyrochlore and brannerite. As a first step, the work has addressed making single phases containing only one actinide or Ce, and no neutron absorbers. This report addresses progress in making these phases.
Date: April 20, 1998
Creator: Vance, E R; Carter, M L & Day, R A
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Imaging Detectors for 20-100 ke V X-ray Backlighters in HEDES Petawatt Experiments

Description: We are developing a petawatt laser for use as a high energy backlighter source in the 20{approx} 100 keV range. High energy x-ray backlighters will be essential for radiographing High-Energy- Density Experimental Science (HEDES) targets for NIF projects especially to probe implosions and high areal density planar samples. For these experiments we are employing two types of detectors: a columnar grown CsI scintillator coupled to a 2K x 2K CCD camera and a CdTe crystal with a special ASIC readout… more
Date: April 16, 2004
Creator: Wickersham, J E; Park, H; Bell, P M; Koch, J A; Landen, O L & Moody, J D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Character and Effective Leadership of the Knowledge Worker

Description: Ulrich in the forward to the Zenger and Folkman (2002) book, ''The Extraordinary Leader'', wrote about the importance of character in leadership stating, ''Everything about great leaders radiates from character. Character improves the probability of exhibiting strong interpersonal skill. Some of this perceived character is innate . . . but more is driven by the leader's self-awareness and interactions with others'' (p. ix). The purpose of this study was to explore the relationship between leade… more
Date: April 20, 2005
Creator: Khoury, A E
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Convex Crystal X-ray Spectrometer for Laser Plasma Experiments

Description: Measuring time and space-resolved spectra is important for understanding Hohlraum and Halfraum plasmas. Experiments at the OMEGA laser have used the Nova TSPEC which was not optimized for the OMEGA diagnostic space envelope or for the needed spectroscopic coverage and resolution. An improved multipurpose spectrometer snout, the MSPEC, has been constructed and fielded on OMEGA. The MSPEC provides the maximal internal volume for mounting crystals without any beam interferences at either 2x or 3x … more
Date: April 15, 2004
Creator: May, M.; Heeter, R. & Emig, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Large Aperture, High-Efficiency Multilayer Dielectric Reflection Gratings

Description: The authors have designed and fabricated a 355 x 150 mm multilayer dielectric diffraction grating, 1800 l/mm for 1030 nm light, that exhibits >99% diffraction efficiency and a diffracted wavefront flatness of <0.15 {lambda}. This grating is an enabling component of a 1 ps, high rep-rate machining laser currently in operation at LLNL.
Date: April 12, 2002
Creator: Britten, J A; Bryan, S J; Summers, L J; Nguyen, H T; Shore, B W & Lyngnes, O
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

LLNL Microsensors Program

Description: The Microsensors Program was born out the need for enhanced sensor technology in support of the Weapons Program. In the interest of expanded diagnostic capabilities to provide true performance characteristics of weapon assemblies in flight and ground tests, a suite of sensor requirements was proposed. These potential new sensor technologies were envisioned to be completely unobtrusive and allow for the development of test vehicles (mock warheads and bomb assemblies) that were designed to mechan… more
Date: April 26, 2004
Creator: Lavietes, A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen